#! /usr/bin/env python

"""
    rpdb2.py - version 2.4.6

    A remote Python debugger for CPython

    Copyright (C) 2005-2009 Nir Aides

    This program is free software; you can redistribute it and/or modify it 
    under the terms of the GNU General Public License as published by the 
    Free Software Foundation; either version 2 of the License, or any later 
    version.

    This program is distributed in the hope that it will be useful, 
    but WITHOUT ANY WARRANTY; without even the implied warranty of 
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
    See the GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along 
    with this program; if not, write to the Free Software Foundation, Inc., 
    51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA    
"""

COPYRIGHT_NOTICE = """Copyright (C) 2005-2009 Nir Aides"""

CREDITS_NOTICE = """This project is waiting for your contribution and support."""

LICENSE_NOTICE = """
This program is free software; you can redistribute it and/or modify it 
under the terms of the GNU General Public License as published by the 
Free Software Foundation; either version 2 of the License, or any later 
version.

This program is distributed in the hope that it will be useful, 
but WITHOUT ANY WARRANTY; without even the implied warranty of 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
See the GNU General Public License for more details.

A copy of the GPL with the precise terms and conditions for 
copying, distribution and modification follow:
"""

COPY_OF_THE_GPL_LICENSE = """
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END OF TERMS AND CONDITIONS
"""



if '.' in __name__:
    raise ImportError('rpdb2 must not be imported as part of a package!')



import subprocess
import threading
import traceback
import zipimport
import tempfile
import __main__
import platform
import operator
import weakref
import os.path
import zipfile
import pickle
import socket
import getopt
import string
import random
import base64
import atexit
import locale
import codecs
import signal
import errno
import time
import copy
import hmac
import stat
import zlib
import sys
import cmd
import imp
import os
import re

try:
    import hashlib
    _md5 = hashlib.md5
except:
    import md5
    _md5 = md5

try:
    import compiler
    import sets
except:
    pass

try:
    import popen2
except:
    pass

try:
    from Crypto.Cipher import DES
except ImportError:
    pass

#
# Pre-Import needed by my_abspath1 
#
try:
    from nt import _getfullpathname
except ImportError:
    pass

try:    
    import SimpleXMLRPCServer 
    import xmlrpclib
    import SocketServer
    import commands
    import copy_reg
    import httplib
    import thread

except:
    #
    # The above modules were renamed in Python 3 so try to import them 'as'
    #
    import xmlrpc.server as SimpleXMLRPCServer
    import xmlrpc.client as xmlrpclib
    import socketserver as SocketServer
    import subprocess as commands
    import copyreg as copy_reg
    import http.client as httplib
    import _thread as thread

    #
    # Needed in py3k path.
    #
    import numbers



#
#-------------------------------- Design Notes -------------------------------
#

"""
  Design:
  
    RPDB2 divides the world into two main parts: debugger and debuggee.
    The debuggee is the script that needs to be debugged.
    The debugger is another script that attaches to the debuggee for the 
    purpose of debugging.

    Thus RPDB2 includes two main components: The debuggee-server that runs 
    in the debuggee and the session-manager that runs in the debugger.
    
    The session manager and the debuggee-server communicate via XML-RPC.

    The main classes are: CSessionManager and CDebuggeeServer
"""



#
#--------------------------------- Export functions ------------------------
#



TIMEOUT_FIVE_MINUTES = 5 * 60.0



def start_embedded_debugger(
            _rpdb2_pwd, 
            fAllowUnencrypted = True, 
            fAllowRemote = False, 
            timeout = TIMEOUT_FIVE_MINUTES, 
            source_provider = None, 
            fDebug = False,
            depth = 0
            ):

    """
    Use 'start_embedded_debugger' to invoke the debugger engine in embedded 
    scripts. put the following line as the first line in your script:

    import rpdb2; rpdb2.start_embedded_debugger(<some-password-string>)

    This will cause the script to freeze until a debugger console attaches.

    _rpdb2_pwd - The password that governs security of client/server communication.

    fAllowUnencrypted - Allow unencrypted communications. Communication will
        be authenticated but encrypted only if possible.

    fAllowRemote - Allow debugger consoles from remote machines to connect.

    timeout - Seconds to wait for attachment before giving up. Once the 
        timeout period expires, the debuggee will resume execution. 
        If None, never give up. If 0, do not wait at all.

    source_provider - When script source is not available on file system it is
        possible to specify a function that receives a "filename" and returns
        its source. If filename specifies a file that does not fall under
        the jurisdiction of this function it should raise IOError. If this
        function is responsible for the specified file but the source is
        not available it should raise IOError(SOURCE_NOT_AVAILABLE). You can
        study the way source_provider_blender() works. Note that a misbehaving 
        function can break the debugger.

    fDebug - debug output.

    depth - Depth of the frame in which the debugger should be started. This
        defaults to '0' so the top of stack will be in the code where
        start_embedded_debugger is called.
    
    IMPORTNAT SECURITY NOTE:
    USING A HARDCODED PASSWORD MAY BE UNSECURE SINCE ANYONE WITH READ
    PERMISSION TO THE SCRIPT WILL BE ABLE TO READ THE PASSWORD AND CONNECT TO 
    THE DEBUGGER AND DO WHATEVER THEY WISH VIA THE 'EXEC' DEBUGGER COMMAND.

    It is safer to use: start_embedded_debugger_interactive_password()    
    """

    return __start_embedded_debugger(
                        _rpdb2_pwd, 
                        fAllowUnencrypted, 
                        fAllowRemote, 
                        timeout, 
                        source_provider,
                        fDebug,
                        depth + 2
                        )
    


def start_embedded_debugger_interactive_password(
                fAllowUnencrypted = True, 
                fAllowRemote = False, 
                timeout = TIMEOUT_FIVE_MINUTES, 
                source_provider = None,
                fDebug = False, 
                stdin = sys.stdin, 
                stdout = sys.stdout,
                depth = 0
                ):
                
    if g_server is not None:
        return

    while True:
        if stdout is not None:
            stdout.write('Please type password:')
            
        _rpdb2_pwd = stdin.readline().rstrip('\n')
        _rpdb2_pwd = as_unicode(_rpdb2_pwd, detect_encoding(stdin), fstrict = True)

        try:
            return __start_embedded_debugger(
                                _rpdb2_pwd, 
                                fAllowUnencrypted, 
                                fAllowRemote, 
                                timeout, 
                                source_provider,
                                fDebug,
                                depth + 2
                                )

        except BadArgument:
            stdout.write(STR_PASSWORD_BAD)
    


def settrace():
    """
    Trace threads that were created with thread.start_new_thread()
    To trace, call this function from the thread target function.
    
    NOTE: The main thread and any threads created with the threading module 
    are automatically traced, and there is no need to invoke this function 
    for them. 

    Note: This call does not pause the script.
    """

    return __settrace()



def setbreak(depth = 0):
    """
    Pause the script for inspection at next script statement.
    """

    return __setbreak(depth + 2)



def set_temp_breakpoint(path, scopename = '', lineno = 1):
    """
    Set a temporary breakpoint in a file. path must be an absolute path.
    scopename can either be an empty string or a fully qualified scope name
    (For example u'g_debugger.m_bp_manager.set_temp_breakpoint'). lineno is 
    either relative to file start or to scope start.

    To set a temporary breakpoint to hit when a file is first
    imported or exec-uted call set_temp_breakpoint(path)

    This function may throw a varaiety of exceptions.
    """

    path = as_unicode(path, fstrict = True)
    scopename = as_unicode(scopename, fstrict = True)

    return __set_temp_breakpoint(path, scopename, lineno)



#
#----------------------------------- Interfaces ------------------------------
#



VERSION = (2, 4, 6, 0, 'Tychod')
RPDB_TITLE = "RPDB 2.4.6 - Tychod"
RPDB_VERSION = "RPDB_2_4_6"
RPDB_COMPATIBILITY_VERSION = "RPDB_2_4_0"



def get_version():
    return RPDB_VERSION


    
def get_interface_compatibility_version():
    return RPDB_COMPATIBILITY_VERSION

    

class CSimpleSessionManager:
    """
    This is a wrapper class that simplifies launching and controlling of a 
    debuggee from within another program. For example, an IDE that launches 
    a script for debugging puposes can use this class to launch, debug and 
    stop a script.
    """
    
    def __init__(self, fAllowUnencrypted = True):
        self.__sm = CSessionManagerInternal(
                            _rpdb2_pwd = None, 
                            fAllowUnencrypted = fAllowUnencrypted, 
                            fAllowRemote = False, 
                            host = LOCALHOST
                            )

        self.m_fRunning = False
        
        event_type_dict = {CEventUnhandledException: {}}
        self.__sm.register_callback(self.__unhandled_exception, event_type_dict, fSingleUse = False)

        event_type_dict = {CEventState: {}}
        self.__sm.register_callback(self.__state_calback, event_type_dict, fSingleUse = False)

        event_type_dict = {CEventExit: {}}
        self.__sm.register_callback(self.__termination_callback, event_type_dict, fSingleUse = False)


    def shutdown(self):
        self.__sm.shutdown()


    def launch(self, fchdir, command_line, encoding = 'utf-8', fload_breakpoints = False):
        command_line = as_unicode(command_line, encoding, fstrict = True)

        self.m_fRunning = False

        self.__sm.launch(fchdir, command_line, fload_breakpoints)


    def request_go(self):
        self.__sm.request_go()


    def detach(self):
        self.__sm.detach()


    def stop_debuggee(self):
        self.__sm.stop_debuggee()

        
    def get_session_manager(self):
        return self.__sm


    def prepare_attach(self):
        """
        Use this method to attach a debugger to the debuggee after an
        exception is caught.
        """
        
        _rpdb2_pwd = self.__sm.get_password()
            
        si = self.__sm.get_server_info()
        rid = si.m_rid

        if os.name == 'posix':
            #
            # On posix systems the password is set at the debuggee via
            # a special temporary file.
            #
            create_pwd_file(rid, _rpdb2_pwd)
            _rpdb2_pwd = None

        return (rid, _rpdb2_pwd)


    #
    # Override these callbacks to react to the related events.
    #
    
    def unhandled_exception_callback(self):
        _print('unhandled_exception_callback')
        self.request_go()


    def script_paused(self):
        _print('script_paused')
        self.request_go()


    def script_terminated_callback(self):
        _print('script_terminated_callback')


    #
    # Private Methods
    #
    
    def __unhandled_exception(self, event):   
        self.unhandled_exception_callback()


    def __termination_callback(self, event):
        self.script_terminated_callback()


    def __state_calback(self, event):   
        """
        Handle state change notifications from the debugge.
        """
        
        if event.m_state != STATE_BROKEN:
            return
        
        if not self.m_fRunning:
            #
            # First break comes immediately after launch.
            #
            print_debug('Simple session manager continues on first break.')
            self.m_fRunning = True
            self.request_go()
            return
            
        if self.__sm.is_unhandled_exception():
            return

        sl = self.__sm.get_stack(tid_list = [], fAll = False)
        if len(sl) == 0:
            self.request_go()
            return

        st = sl[0]
        s = st.get(DICT_KEY_STACK, [])
        if len(s) == 0:
            self.request_go()
            return
            
        e = s[-1]
       
        function_name = e[2]
        filename = os.path.basename(e[0])

        if filename != DEBUGGER_FILENAME:
            #
            # This is a user breakpoint (e.g. rpdb2.setbreak())
            #
            self.script_paused()
            return

        #
        # This is the setbreak() before a fork, exec or program 
        # termination.
        #
        self.request_go()
        return

        

class CSessionManager:
    """
    Interface to the session manager.
    This is the interface through which the debugger controls and 
    communicates with the debuggee.

    Accepted strings are either utf-8 or Unicode unless specified otherwise.
    Returned strings are Unicode (also when embedded in data structures).

    You can study the way it is used in StartClient()
    """
    
    def __init__(self, _rpdb2_pwd, fAllowUnencrypted, fAllowRemote, host):
        if _rpdb2_pwd != None:
            assert(is_valid_pwd(_rpdb2_pwd))
            _rpdb2_pwd = as_unicode(_rpdb2_pwd, fstrict = True)

        self.__smi = CSessionManagerInternal(
                            _rpdb2_pwd, 
                            fAllowUnencrypted, 
                            fAllowRemote, 
                            host
                            )


    def shutdown(self):
        return self.__smi.shutdown()


    def set_printer(self, printer):
        """
        'printer' is a function that takes one argument and prints it.
        You can study CConsoleInternal.printer() as example for use
        and rational.
        """
        
        return self.__smi.set_printer(printer)


    def report_exception(self, type, value, tb):
        """
        Sends exception information to the printer.
        """
        
        return self.__smi.report_exception(type, value, tb)


    def register_callback(self, callback, event_type_dict, fSingleUse):
        """
        Receive events from the session manager. 
        The session manager communicates it state mainly by firing events.
        You can study CConsoleInternal.__init__() as example for use.
        For details see CEventDispatcher.register_callback()
        """
        
        return self.__smi.register_callback(
                                callback, 
                                event_type_dict, 
                                fSingleUse
                                )


    def remove_callback(self, callback):
        return self.__smi.remove_callback(callback)


    def refresh(self):
        """
        Fire again all relevant events needed to establish the current state.
        """
        
        return self.__smi.refresh()


    def launch(self, fchdir, command_line, encoding = 'utf-8', fload_breakpoints = True):
        """
        Launch debuggee in a new process and attach.
        fchdir - Change current directory to that of the debuggee.
        command_line - command line arguments pass to the script as a string.
        fload_breakpoints - Load breakpoints of last session.

        if command line is not a unicode string it will be decoded into unicode
        with the given encoding
        """
        
        command_line = as_unicode(command_line, encoding, fstrict = True)

        return self.__smi.launch(fchdir, command_line, fload_breakpoints)

        
    def restart(self):
        """
        Restart debug session with same command_line and fchdir arguments
        which were used in last launch.
        """
        
        return self.__smi.restart()


    def get_launch_args(self):    
        """
        Return command_line and fchdir arguments which were used in last 
        launch as (last_fchdir, last_command_line).
        Returns (None, None) if there is no info.
        """
        
        return self.__smi.get_launch_args()

        
    def attach(self, key, name = None, encoding = 'utf-8'):
        """
        Attach to a debuggee (establish communication with the debuggee-server)
        key - a string specifying part of the filename or PID of the debuggee.

        if key is not a unicode string it will be decoded into unicode
        with the given encoding
        """
       
        key = as_unicode(key, encoding, fstrict = True)

        return self.__smi.attach(key, name)


    def detach(self):
        """
        Let the debuggee go...
        """
        
        return self.__smi.detach()


    def request_break(self):
        return self.__smi.request_break()

    
    def request_go(self):
        return self.__smi.request_go()

    
    def request_go_breakpoint(self, filename, scope, lineno):
        """
        Go (run) until the specified location is reached.
        """
       
        filename = as_unicode(filename, fstrict = True)
        scope = as_unicode(scope, fstrict = True)

        return self.__smi.request_go_breakpoint(filename, scope, lineno)


    def request_step(self):
        """
        Go until the next line of code is reached.
        """
        
        return self.__smi.request_step()


    def request_next(self):
        """
        Go until the next line of code in the same scope is reached.
        """
        
        return self.__smi.request_next()


    def request_return(self):
        """
        Go until end of scope is reached.
        """
        
        return self.__smi.request_return()


    def request_jump(self, lineno):
        """
        Jump to the specified line number in the same scope.
        """
        
        return self.__smi.request_jump(lineno)


    #
    # REVIEW: should return breakpoint ID
    #
    def set_breakpoint(self, filename, scope, lineno, fEnabled, expr):
        """
        Set a breakpoint.
        
            filename - (Optional) can be either a file name or a module name, 
                       full path, relative path or no path at all. 
                       If filname is None or '', then the current module is 
                       used.
            scope    - (Optional) Specifies a dot delimited scope for the 
                       breakpoint, such as: foo or myClass.foo
            lineno   - (Optional) Specify a line within the selected file or 
                       if a scope is specified, an zero-based offset from the 
                       start of the scope.
            expr     - (Optional) A Python expression that will be evaluated 
                       locally when the breakpoint is hit. The break will 
                       occur only if the expression evaluates to true.
        """

        filename = as_unicode(filename, fstrict = True)
        scope = as_unicode(scope, fstrict = True)
        expr = as_unicode(expr, fstrict = True)

        return self.__smi.set_breakpoint(
                                filename, 
                                scope, 
                                lineno, 
                                fEnabled, 
                                expr
                                )

        
    def disable_breakpoint(self, id_list, fAll):
        """
        Disable breakpoints

            id_list - (Optional) A list of breakpoint ids.
            fAll    - disable all breakpoints regardless of id_list.
        """
        
        return self.__smi.disable_breakpoint(id_list, fAll)

    
    def enable_breakpoint(self, id_list, fAll):
        """
        Enable breakpoints

            id_list - (Optional) A list of breakpoint ids.
            fAll    - disable all breakpoints regardless of id_list.
        """
        
        return self.__smi.enable_breakpoint(id_list, fAll)

    
    def delete_breakpoint(self, id_list, fAll):
        """
        Delete breakpoints

            id_list - (Optional) A list of breakpoint ids.
            fAll    - disable all breakpoints regardless of id_list.
        """
        
        return self.__smi.delete_breakpoint(id_list, fAll)

    
    def get_breakpoints(self):
        """
        Return breakpoints in a dictionary of id keys to CBreakPoint values
        """
        
        return self.__smi.get_breakpoints()

        
    def save_breakpoints(self, _filename = ''):
        """
        Save breakpoints to file, locally (on the client side)
        """

        return self.__smi.save_breakpoints(_filename)


    def load_breakpoints(self, _filename = ''):
        """
        Load breakpoints from file, locally (on the client side)
        """

        return self.__smi.load_breakpoints(_filename)


    def set_trap_unhandled_exceptions(self, ftrap):
        """
        Set trap-unhandled-exceptions mode.
        ftrap with a value of False means unhandled exceptions will be ignored.
        The session manager default is True.
        """

        return self.__smi.set_trap_unhandled_exceptions(ftrap)
    

    def get_trap_unhandled_exceptions(self):
        """
        Get trap-unhandled-exceptions mode.
        """

        return self.__smi.get_trap_unhandled_exceptions()


    def set_fork_mode(self, ffork_into_child, ffork_auto):
        """
        Determine how to handle os.fork().
        
        ffork_into_child - True|False - If True, the debugger will debug the 
            child process after a fork, otherwise the debugger will continue
            to debug the parent process.

        ffork_auto - True|False - If True, the debugger will not pause before
            a fork and will automatically make a decision based on the 
            value of the ffork_into_child flag.
        """

        return self.__smi.set_fork_mode(ffork_into_child, ffork_auto)


    def get_fork_mode(self):
        """
        Return the fork mode in the form of a (ffork_into_child, ffork_auto) 
        flags tuple.
        """

        return self.__smi.get_fork_mode()
    

    def get_stack(self, tid_list, fAll):   
        return self.__smi.get_stack(tid_list, fAll)


    def get_source_file(self, filename, lineno, nlines):
        filename = as_unicode(filename, fstrict = True)

        return self.__smi.get_source_file(filename, lineno, nlines)

        
    def get_source_lines(self, nlines, fAll): 
        return self.__smi.get_source_lines(nlines, fAll)

        
    def set_frame_index(self, frame_index):
        """
        Set frame index. 0 is the current executing frame, and 1, 2, 3,
        are deeper into the stack.
        """

        return self.__smi.set_frame_index(frame_index)


    def get_frame_index(self):
        """
        Get frame index. 0 is the current executing frame, and 1, 2, 3,
        are deeper into the stack.
        """

        return self.__smi.get_frame_index()

        
    def set_analyze(self, fAnalyze):
        """
        Toggle analyze mode. In analyze mode the stack switches to the
        exception stack for examination.
        """
        
        return self.__smi.set_analyze(fAnalyze)

        
    def set_host(self, host):
        """
        Set host to specified host (string) for attaching to debuggies on 
        specified host. host can be a host name or ip address in string form.
        """
        
        return self.__smi.set_host(host)


    def get_host(self):
        return self.__smi.get_host()


    def calc_server_list(self):
        """
        Calc servers (debuggable scripts) list on specified host. 
        Returns a tuple of a list and a dictionary.
        The list is a list of CServerInfo objects sorted by their age
        ordered oldest last.
        The dictionary is a dictionary of errors that were encountered 
        during the building of the list. The dictionary has error (exception)
        type as keys and number of occurances as values.
        """

        return self.__smi.calc_server_list()


    def get_server_info(self):    
        """
        Return CServerInfo server info object that corresponds to the 
        server (debugged script) to which the session manager is 
        attached.
        """

        return self.__smi.get_server_info()


    def get_namespace(self, nl, filter_level, repr_limit = 128, fFilter = "DEPRECATED"):
        """
        get_namespace is designed for locals/globals panes that let 
        the user inspect a namespace tree in GUI debuggers such as Winpdb.
        You can study the way it is used in Winpdb.

        nl - List of tuples, where each tuple is made of a python expression 
             as string and a flag that controls whether to "expand" the 
             value, that is, to return its children as well in case it has 
             children e.g. lists, dictionaries, etc...
             
        filter_level - 0, 1, or 2. Filter out methods and functions from
            classes and objects. (0 - None, 1 - Medium, 2 - Maximum).

        repr_limit - Length limit (approximated) to be imposed on repr() of 
             returned items.
        
        examples of expression lists: 

          [('x', false), ('y', false)]
          [('locals()', true)]
          [('a.b.c', false), ('my_object.foo', false), ('another_object', true)]

        Return value is a list of dictionaries, where every element
        in the list corresponds to an element in the input list 'nl'.

        Each dictionary has the following keys and values:
          DICT_KEY_EXPR - the original expression string.
          DICT_KEY_REPR - A repr of the evaluated value of the expression.
          DICT_KEY_IS_VALID - A boolean that indicates if the repr value is 
                          valid for the purpose of re-evaluation.
          DICT_KEY_TYPE - A string representing the type of the experession's 
                          evaluated value.
          DICT_KEY_N_SUBNODES - If the evaluated value has children like items 
                          in a list or in a dictionary or members of a class, 
                          etc, this key will have their number as value.
          DICT_KEY_SUBNODES - If the evaluated value has children and the 
                          "expand" flag was set for this expression, then the 
                          value of this key will be a list of dictionaries as 
                          described below.
          DICT_KEY_ERROR - If an error prevented evaluation of this expression
                          the value of this key will be a repr of the 
                          exception info: repr(sys.exc_info())

        Each dictionary for child items has the following keys and values:
          DICT_KEY_EXPR - The Python expression that designates this child.
                          e.g. 'my_list[0]' designates the first child of the 
                          list 'my_list'
          DICT_KEY_NAME - a repr of the child name, e.g '0' for the first item
                          in a list.
          DICT_KEY_REPR - A repr of the evaluated value of the expression. 
          DICT_KEY_IS_VALID - A boolean that indicates if the repr value is 
                          valid for the purpose of re-evaluation.
          DICT_KEY_TYPE - A string representing the type of the experession's 
                          evaluated value.
          DICT_KEY_N_SUBNODES - If the evaluated value has children like items 
                          in a list or in a dictionary or members of a class, 
                          etc, this key will have their number as value.
        """
       
        if fFilter != "DEPRECATED":
            filter_level = fFilter

        filter_level = int(filter_level)

        return self.__smi.get_namespace(nl, filter_level, repr_limit)


    #
    # REVIEW: remove warning item.
    #
    def evaluate(self, expr):
        """
        Evaluate a python expression in the context of the current thread
        and frame.

        Return value is a tuple (v, w, e) where v is a repr of the evaluated
        expression value, w is always '', and e is an error string if an error
        occurred.

        NOTE: This call might not return since debugged script logic can lead
        to tmporary locking or even deadlocking.
        """

        expr = as_unicode(expr, fstrict = True)
        
        return self.__smi.evaluate(expr)


    def execute(self, suite):
        """
        Execute a python statement in the context of the current thread
        and frame.

        Return value is a tuple (w, e) where w and e are warning and 
        error strings (respectively) if an error occurred.

        NOTE: This call might not return since debugged script logic can lead
        to tmporary locking or even deadlocking.
        """
        
        suite = as_unicode(suite, fstrict = True)

        return self.__smi.execute(suite)


    def complete_expression(self, expr):
        """
        Return matching completions for expression.
        Accepted expressions are of the form a.b.c

        Dictionary lookups or functions call are not evaluated. For 
        example: 'getobject().complete' or 'dict[item].complete' are
        not processed.

        On the other hand partial expressions and statements are 
        accepted. For example: 'foo(arg1, arg2.member.complete' will
        be accepted and the completion for 'arg2.member.complete' will
        be calculated.

        Completions are returned as a tuple of two items. The first item
        is a prefix to expr and the second item is a list of completions.
        For example if expr is 'foo(self.comp' the returned tuple can
        be ('foo(self.', ['complete', 'completion', etc...])
        """

        expr = as_unicode(expr, fstrict = True)
        
        return self.__smi.complete_expression(expr)


    def set_encoding(self, encoding, fraw = False):
        """
        Set the encoding that will be used as source encoding for execute()
        evaluate() commands and in strings returned by get_namespace().

        The encoding value can be either 'auto' or any encoding accepted by 
        the codecs module. If 'auto' is specified, the encoding used will be 
        the source encoding of the active scope, which is utf-8 by default.

        The default encoding value is 'auto'.

        If fraw is True, strings returned by evaluate() and get_namespace() 
        will represent non ASCII characters as an escape sequence.
        """

        return self.__smi.set_encoding(encoding, fraw)


    def get_encoding(self):
        """
        return the (encoding, fraw) tuple.
        """
        return self.__smi.get_encoding()


    def set_synchronicity(self, fsynchronicity):
        """
        Set the synchronicity mode. 
        
        Traditional Python debuggers that use the inspected thread (usually 
        the main thread) to query or modify the script name-space have to 
        wait until the script hits a break-point. Synchronicity allows the
        debugger to query and modify the script name-space even if its 
        threads are still running or blocked in C library code by using 
        special worker threads. In some rare cases querying or modifying data 
        in synchronicity can crash the script. For example in some Linux 
        builds of wxPython querying the state of wx objects from a thread 
        other than the GUI thread can crash the script. If this happens or 
        if you want to restrict these operations to the inspected thread, 
        turn synchronicity off.

        On the other hand when synchronicity is off it is possible to 
        accidentally deadlock or block indefinitely the script threads by 
        querying or modifying particular data structures.

        The default is on (True).
        """

        return self.__smi.set_synchronicity(fsynchronicity)


    def get_synchronicity(self):
        return self.__smi.get_synchronicity()


    def get_state(self):
        """
        Get the session manager state. Return one of the STATE_* constants
        defined below, for example STATE_DETACHED, STATE_BROKEN, etc...
        """
        
        return self.__smi.get_state()


    #
    # REVIEW: Improve data strucutre.
    #
    def get_thread_list(self):
        return self.__smi.get_thread_list()

        
    def set_thread(self, tid):
        """
        Set the focused thread to the soecified thread.
        tid - either the OS thread id or the zero based index of the thread 
              in the thread list returned by get_thread_list().
        """
        
        return self.__smi.set_thread(tid)


    def set_password(self, _rpdb2_pwd):
        """
        Set the password that will govern the authentication and encryption
        of client-server communication.
        """
       
        _rpdb2_pwd = as_unicode(_rpdb2_pwd, fstrict = True)

        return self.__smi.set_password(_rpdb2_pwd)


    def get_password(self):
        """
        Get the password that governs the authentication and encryption
        of client-server communication.
        """

        return self.__smi.get_password()


    def get_encryption(self):
        """
        Get the encryption mode. Return True if unencrypted connections are
        not allowed. When launching a new debuggee the debuggee will inherit
        the encryption mode. The encryption mode can be set via command-line 
        only.
        """
        
        return self.__smi.get_encryption()


    def set_remote(self, fAllowRemote):
        """
        Set the remote-connections mode. if True, connections from remote
        machine are allowed. When launching a new debuggee the debuggee will 
        inherit this mode. This mode is only relevant to the debuggee. 
        """

        return self.__smi.set_remote(fAllowRemote)


    def get_remote(self):
        """
        Get the remote-connections mode. Return True if connections from 
        remote machine are allowed. When launching a new debuggee the 
        debuggee will inherit this mode. This mode is only relevant to the 
        debuggee. 
        """
        
        return self.__smi.get_remote()


    def set_environ(self, envmap):
        """
        Set the environment variables mapping. This mapping is used 
        when a new script is launched to modify its environment.
        
        Example for a mapping on Windows: [('Path', '%Path%;c:\\mydir')]
        Example for a mapping on Linux: [('PATH', '$PATH:~/mydir')]

        The mapping should be a list of tupples where each tupple is
        composed of a key and a value. Keys and Values must be either 
        strings or Unicode strings. Other types will raise the BadArgument 
        exception.

        Invalid arguments will be silently ignored.
        """
        
        return self.__smi.set_environ(envmap)


    def get_environ(self):
        """
        Return the current environment mapping.
        """
        
        return self.__smi.get_environ()


    def stop_debuggee(self):
        """
        Stop the debuggee immediately.
        """
        
        return self.__smi.stop_debuggee()



class CConsole:
    """
    Interface to a debugger console.
    """
    
    def __init__(
            self, 
            session_manager, 
            stdin = None, 
            stdout = None, 
            fSplit = False
            ):
            
        """
        Constructor of CConsole

        session_manager - session manager object.
        stdin, stdout - redirection for IO.
        fsplit - Set flag to True when Input and Ouput belong to different 
                 panes. For example take a look at Winpdb.
        """
        
        self.m_ci = CConsoleInternal(
                        session_manager, 
                        stdin, 
                        stdout, 
                        fSplit
                        )


    def start(self):
        return self.m_ci.start()


    def join(self):
        """
        Wait until the console ends.
        """
        
        return self.m_ci.join()


    def set_filename(self, filename):
        """
        Set current filename for the console. The current filename can change
        from outside the console when the console is embeded in other 
        components, for example take a look at Winpdb. 
        """

        filename = as_unicode(filename)

        return self.m_ci.set_filename(filename)


    def complete(self, text, state):
        """
        Return the next possible completion for 'text'.
        If a command has not been entered, then complete against command list.
        Otherwise try to call complete_<command> to get list of completions.
        """

        text = as_unicode(text)

        return self.m_ci.complete(text, state)


    def printer(self, text):
        text = as_unicode(text)

        return self.m_ci.printer(text)
        


#
# ---------------------------- Exceptions ----------------------------------
#




class CException(Exception):
    """
    Base exception class for the debugger.
    """
    
    def __init__(self, *args):
        Exception.__init__(self, *args)



class BadMBCSPath(CException):
    """
    Raised on Windows systems when the python executable or debugger script
    path can not be encoded with the file system code page. This means that
    the Windows code page is misconfigured.
    """



class NotPythonSource(CException):
    """
    Raised when an attempt to load non Python source is made.
    """
    


class InvalidScopeName(CException):
    """
    Invalid scope name.
    This exception might be thrown when a request was made to set a breakpoint
    to an unknown scope.
    """



class BadArgument(CException):
    """
    Bad Argument.
    """



class ThreadNotFound(CException):
    """
    Thread not found.
    """



class NoThreads(CException):
    """
    No Threads.
    """



class ThreadDone(CException):
    """
    Thread Done.
    """



class DebuggerNotBroken(CException):
    """
    Debugger is not broken.
    This exception is thrown when an operation that can only be performed
    while the debuggee is broken, is requested while the debuggee is running.
    """



class InvalidFrame(CException):
    """
    Invalid Frame.
    This exception is raised if an operation is requested on a stack frame
    that does not exist.
    """



class NoExceptionFound(CException):
    """
    No Exception Found.
    This exception is raised when exception information is requested, but no
    exception is found, or has been thrown.
    """

    

class CConnectionException(CException):
    def __init__(self, *args):
        CException.__init__(self, *args)



class FirewallBlock(CConnectionException):
    """Firewall is blocking socket communication."""



class BadVersion(CConnectionException):
    """Bad Version."""
    def __init__(self, version):
        CConnectionException.__init__(self)

        self.m_version = version

    def __str__(self):
        return repr(self.m_version)


    
class UnexpectedData(CConnectionException):
    """Unexpected data."""



class AlreadyAttached(CConnectionException):
    """Already Attached."""



class NotAttached(CConnectionException):
    """Not Attached."""



class SpawnUnsupported(CConnectionException):
    """Spawn Unsupported."""



class UnknownServer(CConnectionException):
    """Unknown Server."""



class CSecurityException(CConnectionException):
    def __init__(self, *args):
        CConnectionException.__init__(self, *args)


    
class UnsetPassword(CSecurityException):
    """Unset Password."""


    
class EncryptionNotSupported(CSecurityException):
    """Encryption Not Supported."""



class EncryptionExpected(CSecurityException):
    """Encryption Expected."""


class DecryptionFailure(CSecurityException):
    """Decryption Failure."""



class AuthenticationBadData(CSecurityException):
    """Authentication Bad Data."""



class AuthenticationFailure(CSecurityException):
    """Authentication Failure."""



class AuthenticationBadIndex(CSecurityException):
    """Authentication Bad Index."""
    def __init__(self, max_index = 0, anchor = 0):
        CSecurityException.__init__(self)

        self.m_max_index = max_index
        self.m_anchor = anchor

    def __str__(self):
        return repr((self.m_max_index, self.m_anchor))



#
#----------------- unicode handling for compatibility with py3k ----------------
#



def is_py3k():
    return sys.version_info[0] >= 3



def is_unicode(s):
    if is_py3k() and type(s) == str:
        return True

    if type(s) == unicode:
        return True

    return False



def as_unicode(s, encoding = 'utf-8', fstrict = False):
    if is_unicode(s):
        return s

    if fstrict:
        u = s.decode(encoding)
    else:
        u = s.decode(encoding, 'replace')

    return u



def as_string(s, encoding = 'utf-8', fstrict = False):
    if is_py3k():
        if is_unicode(s):
            return s

        if fstrict:
            e = s.decode(encoding)
        else:
            e = s.decode(encoding, 'replace')

        return e

    if not is_unicode(s):
        return s

    if fstrict:
        e = s.encode(encoding)
    else:
        e = s.encode(encoding, 'replace')

    return e



def as_bytes(s, encoding = 'utf-8', fstrict = True):
    if not is_unicode(s):
        return s

    if fstrict:
        b = s.encode(encoding)
    else:
        b = s.encode(encoding, 'replace')

    return b



#
#----------------------- Infinite List of Globals ---------------------------
#



#
# According to PEP-8: "Use 4 spaces per indentation level." 
#
PYTHON_TAB_WIDTH = 4

GNOME_DEFAULT_TERM = 'gnome-terminal'
NT_DEBUG = 'nt_debug'
SCREEN = 'screen'
MAC = 'mac'
DARWIN = 'darwin'
POSIX = 'posix'

#
# Map between OS type and relevant command to initiate a new OS console.
# entries for other OSs can be added here. 
# '%s' serves as a place holder.
#
# Currently there is no difference between 'nt' and NT_DEBUG, since now
# both of them leave the terminal open after termination of debuggee to
# accommodate scenarios of scripts with child processes.
#
osSpawn = {
    'nt': 'start "rpdb2 - Version ' + get_version() + ' - Debuggee Console" cmd.exe /K ""%(exec)s" %(options)s"', 
    NT_DEBUG: 'start "rpdb2 - Version ' + get_version() + ' - Debuggee Console" cmd.exe /K ""%(exec)s" %(options)s"', 
    POSIX: "%(term)s -e %(shell)s -c '%(exec)s %(options)s; %(shell)s' &", 
    'Terminal': "Terminal --disable-server -x %(shell)s -c '%(exec)s %(options)s; %(shell)s' &", 
    GNOME_DEFAULT_TERM: "gnome-terminal --disable-factory -x %(shell)s -c '%(exec)s %(options)s; %(shell)s' &", 
    MAC: '%(exec)s %(options)s',
    DARWIN: '%(exec)s %(options)s',
    SCREEN: 'screen -t debuggee_console %(exec)s %(options)s'
}

RPDBTERM = 'RPDBTERM'
COLORTERM = 'COLORTERM'
TERM = 'TERM'
KDE_PREFIX = 'KDE'
GNOME_PREFIX = 'GNOME'

KDE_DEFAULT_TERM_QUERY = "kreadconfig --file kdeglobals --group General --key TerminalApplication --default konsole"
XTERM = 'xterm'
RXVT = 'rxvt'

RPDB_SETTINGS_FOLDER = '.rpdb2_settings'
RPDB_PWD_FOLDER = os.path.join(RPDB_SETTINGS_FOLDER, 'passwords')
RPDB_BPL_FOLDER = os.path.join(RPDB_SETTINGS_FOLDER, 'breakpoints')
RPDB_BPL_FOLDER_NT = 'rpdb2_breakpoints'
MAX_BPL_FILES = 100

EMBEDDED_SYNC_THRESHOLD = 1.0
EMBEDDED_SYNC_TIMEOUT = 5.0

HEARTBEAT_TIMEOUT = 16
IDLE_MAX_RATE = 2.0
PING_TIMEOUT = 4.0
LOCAL_TIMEOUT = 1.0
COMMUNICATION_RETRIES = 5

WAIT_FOR_BREAK_TIMEOUT = 3.0

SHUTDOWN_TIMEOUT = 4.0
STARTUP_TIMEOUT = 3.0
STARTUP_RETRIES = 3

LOOPBACK = '127.0.0.1'
LOCALHOST = 'localhost'

SERVER_PORT_RANGE_START = 51000
SERVER_PORT_RANGE_LENGTH = 24

SOURCE_EVENT_CALL = 'C'
SOURCE_EVENT_LINE = 'L'
SOURCE_EVENT_RETURN = 'R'
SOURCE_EVENT_EXCEPTION = 'E'
SOURCE_STATE_UNBROKEN = '*'
SOURCE_BP_ENABLED = 'B'
SOURCE_BP_DISABLED = 'D'

SYMBOL_MARKER = '>'
SYMBOL_ALL = '*'
SOURCE_MORE = '+'
SOURCE_LESS = '-'
SOURCE_ENTIRE_FILE = '^'
CONSOLE_PRINTER = '*** '
CONSOLE_WRAP_INDEX = 78
CONSOLE_PROMPT = '\n> '
CONSOLE_PROMPT_ANALYZE = '\nAnalayze> '
CONSOLE_INTRO = ("""RPDB2 - The Remote Python Debugger, version %s,
Copyright (C) 2005-2009 Nir Aides.
Type "help", "copyright", "license", "credits" for more information.""" % (RPDB_VERSION))

PRINT_NOTICE_PROMPT = "Hit Return for more, or q (and Return) to quit:"
PRINT_NOTICE_LINES_PER_SECTION = 20

STR_NO_THREADS = "Operation failed since no traced threads were found."
STR_STARTUP_NOTICE = "Attaching to debuggee..."
STR_SPAWN_UNSUPPORTED = "The debugger does not know how to open a new console on this system. You can start the debuggee manually with the -d flag on a separate console and then use the 'attach' command to attach to it."
STR_SPAWN_UNSUPPORTED_SCREEN_SUFFIX =  """Alternatively, you can use the screen utility and invoke rpdb2 in screen mode with the -s command-line flag as follows: 
screen rpdb2 -s some-script.py script-arg1 script-arg2..."""
STR_AUTOMATIC_LAUNCH_UNKNOWN = STR_SPAWN_UNSUPPORTED
STR_STARTUP_SPAWN_NOTICE = "Starting debuggee..."
STR_KILL_NOTICE = "Stopping debuggee..."
STR_STARTUP_FAILURE = "Debuggee failed to start in a timely manner."
STR_OUTPUT_WARNING = "Textual output will be done at the debuggee."
STR_OUTPUT_WARNING_ASYNC = "The operation will continue to run in the background."
STR_ANALYZE_GLOBALS_WARNING = "In analyze mode the globals and locals dictionaries are read only."
STR_BREAKPOINTS_LOADED = "Breakpoints were loaded."
STR_BREAKPOINTS_SAVED = "Breakpoints were saved."
STR_BREAKPOINTS_SAVE_PROBLEM = "A problem occurred while saving the breakpoints."
STR_BREAKPOINTS_LOAD_PROBLEM = "A problem occurred while loading the breakpoints."
STR_BREAKPOINTS_NOT_SAVED = "Breakpoints were not saved."
STR_BREAKPOINTS_NOT_LOADED = "Breakpoints were not loaded."
STR_BREAKPOINTS_FILE_NOT_FOUND = "Breakpoints file was not found." 
STR_BREAKPOINTS_NOT_FOUND = "No Breakpoints were found." 
STR_BAD_FILENAME = "Bad File Name."
STR_SOME_BREAKPOINTS_NOT_LOADED = "Some breakpoints were not loaded, because of an error."
STR_BAD_EXPRESSION = "Bad expression '%s'."
STR_FILE_NOT_FOUND = "File '%s' not found."
STR_DISPLAY_ERROR = """If the X server (Windowing system) is not started you need to use rpdb2 with the screen utility and invoke rpdb2 in screen mode with the -s command-line flag as follows: 
screen rpdb2 -s some-script.py script-arg1 script-arg2..."""
STR_EXCEPTION_NOT_FOUND = "No exception was found."
STR_SCOPE_NOT_FOUND = "Scope '%s' not found."
STR_NO_SUCH_BREAKPOINT = "Breakpoint not found."
STR_THREAD_NOT_FOUND = "Thread was not found."
STR_NO_THREADS_FOUND = "No threads were found."
STR_THREAD_NOT_BROKEN = "Thread is running."
STR_THREAD_FOCUS_SET = "Focus was set to chosen thread."
STR_ILEGAL_ANALYZE_MODE_ARG = "Argument is not allowed in analyze mode. Type 'help analyze' for more info."
STR_ILEGAL_ANALYZE_MODE_CMD = "Command is not allowed in analyze mode. Type 'help analyze' for more info."
STR_ANALYZE_MODE_TOGGLE = "Analyze mode was set to: %s."
STR_BAD_ARGUMENT = "Bad Argument."
STR_BAD_SYNTAX = 'Unknown syntax: %s\nDid you forget to use the exec or eval console commands?'
STR_PSYCO_WARNING = "The psyco module was detected. The debugger is incompatible with the psyco module and will not function correctly as long as the psyco module is imported and used."
STR_CONFLICTING_MODULES = "The modules: %s, which are incompatible with the debugger were detected and can possibly cause the debugger to fail."
STR_SIGNAL_INTERCEPT = "The signal %s(%d) was intercepted inside debugger tracing logic. It will be held pending until the debugger continues. Any exceptions raised by the handler will be ignored!"
STR_SIGNAL_EXCEPTION = "Exception %s raised by handler of signal %s(%d) inside debugger tracing logic was ignored!"
STR_DEBUGGEE_TERMINATED = "Debuggee has terminated."
STR_DEBUGGEE_NOT_BROKEN = "Debuggee has to be waiting at break point to complete this command."
STR_DEBUGGER_HAS_BROKEN = "Debuggee is waiting at break point for further commands."
STR_ALREADY_ATTACHED = "Already attached. Detach from debuggee and try again."
STR_NOT_ATTACHED = "Not attached to any script. Attach to a script and try again."
STR_COMMUNICATION_FAILURE = "Failed to communicate with debugged script."
STR_ERROR_OTHER = "Command returned the following error:\n%(type)s, %(value)s.\nPlease check stderr for stack trace and report to support."
STR_BAD_MBCS_PATH = "The debugger can not launch the script since the path to the Python executable or the debugger scripts can not be encoded into the default system code page. Please check the settings of 'Language for non-Unicode programs' in the Advanced tab of the Windows Regional and Language Options dialog."
STR_LOST_CONNECTION = "Lost connection to debuggee."
STR_FIREWALL_BLOCK = "A firewall is blocking the local communication chanel (socket) that is required between the debugger and the debugged script. Please make sure that the firewall allows that communication."
STR_BAD_VERSION = "A debuggee was found with incompatible debugger version %(value)s."
STR_BAD_VERSION2 = "While attempting to find the specified debuggee at least one debuggee was found that uses incompatible version of RPDB2."
STR_UNEXPECTED_DATA = "Unexpected data received."
STR_ACCESS_DENIED = "While attempting to find debuggee, at least one debuggee denied connection because of mismatched passwords. Please verify your password."
STR_ACCESS_DENIED2 = "Communication is denied because of un-matching passwords."
STR_ENCRYPTION_EXPECTED = "While attempting to find debuggee, at least one debuggee denied connection since it accepts encrypted connections only."
STR_ENCRYPTION_EXPECTED2 = "Debuggee will only talk over an encrypted channel."
STR_DECRYPTION_FAILURE = "Bad packet was received by the debuggee."
STR_DEBUGGEE_NO_ENCRYPTION = "Debuggee does not support encrypted mode. Either install the python-crypto package on the debuggee machine or allow unencrypted connections."
STR_RANDOM_PASSWORD = "Password has been set to a random password."
STR_PASSWORD_INPUT = "Please type a password:"
STR_PASSWORD_CONFIRM = "Password has been set."
STR_PASSWORD_NOT_SUPPORTED = "The --pwd flag is only supported on NT systems."
STR_PASSWORD_MUST_BE_SET = "A password should be set to secure debugger client-server communication."
STR_BAD_DATA = "Bad data received from debuggee."
STR_BAD_FILE_DATA = "Bad data received from file."
STR_ATTACH_FAILED = "Failed to attach"
STR_ATTACH_FAILED_NAME = "Failed to attach to '%s'."
STR_ATTACH_CRYPTO_MODE = "Debug Channel is%s encrypted."
STR_ATTACH_CRYPTO_MODE_NOT = "NOT"
STR_ATTACH_SUCCEEDED = "Successfully attached to '%s'."
STR_ATTEMPTING_TO_STOP = "Requesting script to stop."
STR_ATTEMPTING_TO_DETACH = "Detaching from script..."
STR_DETACH_SUCCEEDED = "Detached from script."
STR_DEBUGGEE_UNKNOWN = "Failed to find script."
STR_MULTIPLE_DEBUGGEES = "WARNING: There is more than one debuggee '%s'."
MSG_ERROR_HOST_TEXT = """The debugger was not able to set the host to '%s'.
The following error was returned:
%s"""
STR_SOURCE_NOT_FOUND = "Failed to get source from debuggee."
STR_SCRIPTS_CONNECTING = "Connecting to '%s'..."
STR_SCRIPTS_NO_SCRIPTS = "No scripts to debug on '%s'"
STR_SCRIPTS_TO_DEBUG = """Scripts to debug on '%s':

   pid    name
--------------------------"""
STR_STACK_TRACE = """Stack trace for thread %d:

   Frame  File Name                     Line  Function                 
------------------------------------------------------------------------------""" 
STR_SOURCE_LINES = """Source lines for thread %d from file '%s':
""" 
STR_ACTIVE_THREADS = """List of active threads known to the debugger:

    No    Tid  Name             State                 
-----------------------------------------------""" 
STR_BREAKPOINTS_LIST = """List of breakpoints:

 Id  State      Line  Filename-Scope-Condition-Encoding
------------------------------------------------------------------------------""" 

STR_BREAKPOINTS_TEMPLATE = """ %2d  %-8s  %5d  %s
                      %s
                      %s
                      %s"""

STR_ENCRYPTION_SUPPORT_ERROR = "Encryption is not supported since the python-crypto package was not found. Either install the python-crypto package or allow unencrypted connections."
STR_PASSWORD_NOT_SET = 'Password is not set.'
STR_PASSWORD_SET = 'Password is set to: "%s"'
STR_PASSWORD_BAD = 'The password should begin with a letter and continue with any combination of digits, letters or underscores (\'_\'). Only English characters are accepted for letters.'
STR_ENCRYPT_MODE = 'Force encryption mode: %s'
STR_REMOTE_MODE = 'Allow remote machines mode: %s'
STR_ENCODING_MODE = 'Encoding is set to: %s'
STR_ENCODING_MODE_SET = 'Encoding was set to: %s'
STR_ENCODING_BAD = 'The specified encoding was not recognized by the debugger.'
STR_ENVIRONMENT = 'The current environment mapping is:'
STR_ENVIRONMENT_EMPTY = 'The current environment mapping is not set.'
STR_SYNCHRONICITY_BAD = "Can not process command when thread is running unless synchronicity mode is turned on. Type 'help synchro' at the command prompt for more information."
STR_SYNCHRONICITY_MODE = 'The synchronicity mode is set to: %s'
STR_TRAP_MODE = 'Trap unhandled exceptions mode is set to: %s'
STR_TRAP_MODE_SET = "Trap unhandled exceptions mode was set to: %s."
STR_FORK_MODE = "Fork mode is set to: %s, %s."
STR_FORK_MODE_SET = "Fork mode was set to: %s, %s."
STR_LOCAL_NAMESPACE_WARNING = 'Debugger modifications to the original bindings of the local namespace of this frame will be committed before the execution of the next statement of the frame. Any code using these variables executed before that point will see the original values.'
STR_WARNING = 'Warning: %s' 

STR_MAX_NAMESPACE_WARNING_TITLE = 'Namespace Warning'
STR_MAX_NAMESPACE_WARNING_TYPE = '*** WARNING ***'
STR_MAX_NAMESPACE_WARNING_MSG = 'Number of items exceeds capacity of namespace browser.'
STR_MAX_EVALUATE_LENGTH_WARNING = 'Output length exeeds maximum capacity.'

FORK_CHILD = 'child'
FORK_PARENT = 'parent'
FORK_MANUAL = 'manual'
FORK_AUTO = 'auto'

ENCRYPTION_ENABLED = 'encrypted'
ENCRYPTION_DISABLED = 'plain-text'

STATE_ENABLED = 'enabled'
STATE_DISABLED = 'disabled'

BREAKPOINTS_FILE_EXT = '.bpl'
PYTHON_FILE_EXTENSION = '.py'
PYTHONW_FILE_EXTENSION = '.pyw'
PYTHONW_SO_EXTENSION = '.so'
PYTHON_EXT_LIST = ['.py', '.pyw', '.pyc', '.pyd', '.pyo', '.so']

MODULE_SCOPE = '?'
MODULE_SCOPE2 = '<module>'

BLENDER_SOURCE_NOT_AVAILABLE = as_unicode('Blender script source code is not available.')
SOURCE_NOT_AVAILABLE = as_unicode('Source code is not available.')

SCOPE_SEP = '.'

BP_FILENAME_SEP = ':'
BP_EVAL_SEP = ','

DEBUGGER_FILENAME = 'rpdb2.py'
THREADING_FILENAME = 'threading.py'

STR_STATE_BROKEN = 'waiting at break point'

STATE_BROKEN = 'broken'
STATE_RUNNING = 'running'

STATE_ANALYZE = 'analyze'
STATE_DETACHED = 'detached'
STATE_DETACHING = 'detaching'
STATE_SPAWNING = 'spawning'
STATE_ATTACHING = 'attaching'

DEFAULT_NUMBER_OF_LINES = 20

DICT_KEY_TID = 'tid'
DICT_KEY_STACK = 'stack'
DICT_KEY_CODE_LIST = 'code_list'
DICT_KEY_CURRENT_TID = 'current tid'
DICT_KEY_BROKEN = 'broken'
DICT_KEY_BREAKPOINTS = 'breakpoints'
DICT_KEY_LINES = 'lines'
DICT_KEY_FILENAME = 'filename'
DICT_KEY_FIRST_LINENO = 'first_lineno'
DICT_KEY_FRAME_LINENO = 'frame_lineno'
DICT_KEY_EVENT = 'event'
DICT_KEY_EXPR = 'expr'
DICT_KEY_NAME = 'name'
DICT_KEY_REPR = 'repr'
DICT_KEY_IS_VALID = 'fvalid'
DICT_KEY_TYPE = 'type'
DICT_KEY_SUBNODES = 'subnodes'
DICT_KEY_N_SUBNODES = 'n_subnodes'
DICT_KEY_ERROR = 'error'

RPDB_EXEC_INFO = as_unicode('rpdb_exception_info')

MODE_ON = 'ON'
MODE_OFF = 'OFF'

ENCODING_UTF8_PREFIX_1 = '\xef\xbb\xbf'
ENCODING_SOURCE = '# -*- coding: %s -*-\n'
ENCODING_AUTO = as_unicode('auto')
ENCODING_RAW = as_unicode('raw')
ENCODING_RAW_I = as_unicode('__raw')

MAX_EVALUATE_LENGTH = 256 * 1024
MAX_NAMESPACE_ITEMS = 1024
MAX_SORTABLE_LENGTH = 256 * 1024
REPR_ID_LENGTH = 4096

MAX_NAMESPACE_WARNING = {
    DICT_KEY_EXPR: STR_MAX_NAMESPACE_WARNING_TITLE, 
    DICT_KEY_NAME: STR_MAX_NAMESPACE_WARNING_TITLE, 
    DICT_KEY_REPR: STR_MAX_NAMESPACE_WARNING_MSG,
    DICT_KEY_IS_VALID: False,
    DICT_KEY_TYPE: STR_MAX_NAMESPACE_WARNING_TYPE, 
    DICT_KEY_N_SUBNODES: 0
    }

MAX_EVENT_LIST_LENGTH = 1000

EVENT_EXCLUDE = 'exclude'
EVENT_INCLUDE = 'include'

INDEX_TABLE_SIZE = 100

DISPACHER_METHOD = 'dispatcher_method'

CONFLICTING_MODULES = ['psyco', 'pdb', 'bdb', 'doctest']

XML_DATA = """<?xml version='1.0'?>
<methodCall>
<methodName>dispatcher_method</methodName>
<params>
<param>
<value><string>%s</string></value>
</param>
</params>
</methodCall>""" % RPDB_COMPATIBILITY_VERSION

N_WORK_QUEUE_THREADS = 8

DEFAULT_PATH_SUFFIX_LENGTH = 55

ELLIPSIS_UNICODE = as_unicode('...')
ELLIPSIS_BYTES = as_bytes('...')

ERROR_NO_ATTRIBUTE = 'Error: No attribute.'


g_server_lock = threading.RLock()
g_server = None
g_debugger = None

g_fScreen = False
g_fDefaultStd = True

#
# In debug mode errors and tracebacks are printed to stdout
#
g_fDebug = False

#
# Lock for the traceback module to prevent it from interleaving 
# output from different threads.
#
g_traceback_lock = threading.RLock()

g_source_provider_aux = None
g_lines_cache = {}

g_initial_cwd = []

g_error_mapping = {
    socket.error: STR_COMMUNICATION_FAILURE,
   
    CConnectionException: STR_LOST_CONNECTION,
    FirewallBlock: STR_FIREWALL_BLOCK,
    BadVersion: STR_BAD_VERSION,
    UnexpectedData: STR_UNEXPECTED_DATA,
    SpawnUnsupported: STR_SPAWN_UNSUPPORTED,
    UnknownServer: STR_DEBUGGEE_UNKNOWN,
    UnsetPassword: STR_PASSWORD_MUST_BE_SET,
    EncryptionNotSupported: STR_DEBUGGEE_NO_ENCRYPTION,
    EncryptionExpected: STR_ENCRYPTION_EXPECTED,
    DecryptionFailure: STR_DECRYPTION_FAILURE,
    AuthenticationBadData: STR_ACCESS_DENIED,
    AuthenticationFailure: STR_ACCESS_DENIED,
    BadMBCSPath: STR_BAD_MBCS_PATH,

    AlreadyAttached: STR_ALREADY_ATTACHED,    
    NotAttached: STR_NOT_ATTACHED,
    DebuggerNotBroken: STR_DEBUGGEE_NOT_BROKEN,
    NoThreads: STR_NO_THREADS,
    NoExceptionFound: STR_EXCEPTION_NOT_FOUND,
}

#
# These globals are related to handling the os.fork() os._exit() and exec
# pattern.
#
g_forkpid = None
g_forktid = None
g_fignorefork = False

g_exectid = None
g_execpid = None

g_fos_exit = False


#
# To hold a reference to __main__ to prevent its release if an unhandled
# exception is raised.
#
g_module_main = None

g_found_conflicting_modules = []

g_fignore_atexit = False
g_ignore_broken_pipe = 0


#
# Unicode version of path names that do not encode well witn the windows 
# 'mbcs' encoding. This dict is used to work with such path names on
# windows.
#
g_found_unicode_files = {}

g_frames_path = {}

g_signal_handlers = {}
g_signals_pending = []

#g_profile = None

g_fFirewallTest = True



g_safe_base64_to = string.maketrans(as_bytes('/+='), as_bytes('_-#'))
g_safe_base64_from = string.maketrans(as_bytes('_-#'), as_bytes('/+='))



g_alertable_waiters = {}



g_builtins_module = sys.modules.get('__builtin__', sys.modules.get('builtins'))



#
# ---------------------------- General Utils ------------------------------
#



def job_wrapper(event, foo, *args, **kwargs):
    try:
        #print_debug('Thread %d doing job %s' % (thread.get_ident(), foo.__name__))
        foo(*args, **kwargs)
    finally:
        event.set()



def send_job(tid, timeout, foo, *args, **kwargs):
    #
    # Attempt to send job to thread tid.
    # Will throw KeyError if thread tid is not available for jobs.
    #

    (lock, jobs) = g_alertable_waiters[tid]

    event = threading.Event()
    f = lambda: job_wrapper(event, foo, *args, **kwargs)
    jobs.append(f)
    
    try:
        lock.acquire()
        lock_notify_all(lock)
    finally:
        lock.release()

    safe_wait(event, timeout)



def alertable_wait(lock, timeout = None):
    jobs = []
    tid = thread.get_ident()
    g_alertable_waiters[tid] = (lock, jobs)

    try:
        safe_wait(lock, timeout)
        
        while len(jobs) != 0:
            job = jobs.pop(0)
            try:
                job()
            except:
                pass
            
            if len(jobs) == 0:
                time.sleep(0.1)

    finally:
        del g_alertable_waiters[tid]



def safe_wait(lock, timeout = None):
    #
    # workaround windows bug where signal handlers might raise exceptions
    # even if they return normally.
    #

    while True:
        try:
            t0 = time.time()
            return lock.wait(timeout)

        except:
            if timeout == None:
                continue
            
            timeout -= (time.time() - t0)
            if timeout <= 0:
                return



#
# The following code is related to the ability of the debugger
# to work both on Python 2.5 and 3.0.
#

def lock_notify_all(lock):
    try:
        if is_py3k():
            return lock.notify_all()

    except AttributeError:
        pass

    return lock.notifyAll()



def event_is_set(event):
    try:
        if is_py3k():
            return event.is_set()

    except AttributeError:
        pass

    return event.isSet()



def thread_set_daemon(thread, fdaemon):
    try:
        if is_py3k():
            return thread.set_daemon(fdaemon)

    except AttributeError:
        pass

    return thread.setDaemon(fdaemon)



def thread_is_alive(thread):
    try:
        if is_py3k():
            return thread.is_alive()

    except AttributeError:
        pass

    return thread.isAlive()



def thread_set_name(thread, name):
    try:
        if is_py3k():
            return thread.set_name(name)

    except AttributeError:
        pass

    return thread.setName(name)



def thread_get_name(thread):
    try:
        if is_py3k():
            return thread.get_name()

    except AttributeError:
        pass

    return thread.getName()



def current_thread():
    try:
        if is_py3k():
            return threading.current_thread()

    except AttributeError:
        pass

    return threading.currentThread()



class _stub_type:
    pass



def _rpdb2_bytes(s, e):
    return s.encode(e)
   


if not hasattr(g_builtins_module, 'unicode'):
    unicode = _stub_type

if not hasattr(g_builtins_module, 'long'):
    long = _stub_type

if not hasattr(g_builtins_module, 'str8'):
    str8 = _stub_type

if not hasattr(g_builtins_module, 'bytearray'):
    bytearray = _stub_type

if not hasattr(g_builtins_module, 'bytes'):
    bytes = _stub_type

    #
    # Pickle on Python 2.5 should know how to handle byte strings
    # that arrive from Python 3.0 over sockets.
    #
    g_builtins_module.bytes = _rpdb2_bytes


if is_py3k():
    class sets:
        Set = _stub_type
        BaseSet = _stub_type
        ImmutableSet = _stub_type



if sys.version_info[:2] <= (2, 3):
    set = sets.Set



def _raw_input(s):
    if is_py3k():
        return input(s)

    i = raw_input(s)
    i = as_unicode(i, detect_encoding(sys.stdin), fstrict = True)

    return i



def _print(s, f = sys.stdout, feol = True):
    s = as_unicode(s)

    encoding = detect_encoding(f)

    s = as_bytes(s, encoding, fstrict = False)
    s = as_string(s, encoding)

    if feol:
        f.write(s + '\n')
    else:
        f.write(s)



def detect_encoding(file):
    try:
        encoding = file.encoding
        if encoding == None:
            return detect_locale()

    except:
        return detect_locale()

    try:
        codecs.lookup(encoding)
        return encoding

    except:
        pass

    if encoding.lower().startswith('utf_8'):
        return 'utf-8'

    return 'ascii'



def detect_locale():
    encoding = locale.getdefaultlocale()[1]

    if encoding == None:
        return 'ascii'

    try:
        codecs.lookup(encoding)
        return encoding


    except:
        pass

    if encoding.lower().startswith('utf_8'):
        return 'utf-8'

    return 'ascii'



def class_name(c):
    s = safe_str(c)
    
    if "'" in s:
        s = s.split("'")[1]

    assert(s.startswith(__name__ + '.'))
    
    return s

    

def clip_filename(path, n = DEFAULT_PATH_SUFFIX_LENGTH):
    suffix = calc_suffix(path, n)
    if not suffix.startswith('...'):
        return suffix

    index = suffix.find(os.sep)
    if index == -1:
        return suffix

    clip = '...' + suffix[index:]

    return clip
    


def safe_str(x):
    try:
        return str(x)

    except:
        return 'N/A'
    


def safe_repr(x):
    try:
        return repr(x)

    except:
        return 'N/A'



def parse_type(t):
    rt = safe_repr(t)
    if not "'" in rt:
        return rt

    st = rt.split("'")[1]
    return st


def repr_list(pattern, l, length, encoding, is_valid):
    length = max(0, length - len(pattern) + 2)

    s = ''

    index = 0

    try:
        for i in l:
            #
            # Remove any trace of session password from data structures that 
            # go over the network.
            #
            if type(i) == str and i in ['_rpdb2_args', '_rpdb2_pwd', 'm_rpdb2_pwd']:
                continue
            
            s += repr_ltd(i, length - len(s), encoding, is_valid)

            index += 1
            
            if index < len(l) and len(s) > length:
                is_valid[0] = False
                if not s.endswith('...'):
                    s += '...'
                break

            if index < len(l) or (index == 1 and pattern[0] == '('):
                s += ', '

    except AttributeError:
        is_valid[0] = False 

    return as_unicode(pattern % s)



def repr_dict(pattern, d, length, encoding, is_valid):
    length = max(0, length - len(pattern) + 2)

    s = ''

    index = 0

    try:
        for k in d:
            #
            # Remove any trace of session password from data structures that 
            # go over the network.
            #
            if type(k) == str and k in ['_rpdb2_args', '_rpdb2_pwd', 'm_rpdb2_pwd']:
                continue
            
            v = d[k]

            s += repr_ltd(k, length - len(s), encoding, is_valid)

            if len(s) > length:
                is_valid[0] = False
                if not s.endswith('...'):
                    s += '...'
                break

            s +=  ': ' + repr_ltd(v, length - len(s), encoding, is_valid)

            index += 1

            if index < len(d) and len(s) > length:
                is_valid[0] = False
                if not s.endswith('...'):
                    s += '...'
                break

            if index < len(d):
                s += ', '

    except AttributeError:
        is_valid[0] = False 

    return as_unicode(pattern % s)



def repr_bytearray(s, length, encoding, is_valid):
    try:
        s = s.decode(encoding)
        r = repr_unicode(s, length, is_valid)
        return 'bytearray(b' + r[1:] + ')'

    except:
        #
        # If a string is not encoded as utf-8 its repr() will be done with
        # the regular repr() function.
        #
        return repr_str_raw(s, length, is_valid)



def repr_bytes(s, length, encoding, is_valid):
    try:
        s = s.decode(encoding)
        r = repr_unicode(s, length, is_valid)
        return 'b' + r[1:]

    except:
        #
        # If a string is not encoded as utf-8 its repr() will be done with
        # the regular repr() function.
        #
        return repr_str_raw(s, length, is_valid)



def repr_str8(s, length, encoding, is_valid):
    try:
        s = s.decode(encoding)
        r = repr_unicode(s, length, is_valid)
        return 's' + r[1:]

    except:
        #
        # If a string is not encoded as utf-8 its repr() will be done with
        # the regular repr() function.
        #
        return repr_str_raw(s, length, is_valid)



def repr_str(s, length, encoding, is_valid):
    try:
        s = as_unicode(s, encoding, fstrict = True)
        r = repr_unicode(s, length, is_valid)
        return r[1:]

    except:
        #
        # If a string is not encoded as utf-8 its repr() will be done with
        # the regular repr() function.
        #
        return repr_str_raw(s, length, is_valid)



def repr_unicode(s, length, is_valid):
    index = [2, 1][is_py3k()]

    rs = ''

    for c in s:
        if len(rs) > length:
            is_valid[0] = False
            rs += '...'
            break

        if ord(c) < 128:
            rs += repr(c)[index: -1]
        else:
            rs += c

    if not "'" in rs:
        return as_unicode("u'%s'" % rs)

    if not '"' in rs:
        return as_unicode('u"%s"' % rs)
   
    return as_unicode("u'%s'" % rs.replace("'", "\\'"))



def repr_str_raw(s, length, is_valid):
    if is_unicode(s):
        eli = ELLIPSIS_UNICODE
    else:
        eli = ELLIPSIS_BYTES

    if len(s) > length:
        is_valid[0] = False
        s = s[: length] + eli

    return as_unicode(repr(s))



def repr_base(v, length, is_valid):
    r = repr(v)

    if len(r) > length:
        is_valid[0] = False
        r = r[: length] + '...'

    return as_unicode(r)



def repr_ltd(x, length, encoding, is_valid = [True]):
    try:
        length = max(0, length)

        try:
            if isinstance(x, frozenset):
                return repr_list('frozenset([%s])', x, length, encoding, is_valid)

            if isinstance(x, set):
                return repr_list('set([%s])', x, length, encoding, is_valid)

        except NameError:
            pass

        if isinstance(x, sets.Set):
            return repr_list('sets.Set([%s])', x, length, encoding, is_valid)

        if isinstance(x, sets.ImmutableSet):
            return repr_list('sets.ImmutableSet([%s])', x, length, encoding, is_valid)

        if isinstance(x, list):
            return repr_list('[%s]', x, length, encoding, is_valid)

        if isinstance(x, tuple):
            return repr_list('(%s)', x, length, encoding, is_valid)

        if isinstance(x, dict):
            return repr_dict('{%s}', x, length, encoding, is_valid)

        if encoding == ENCODING_RAW_I and [True for t in [str, unicode, bytearray, bytes, str8] if t is type(x)]:
            return repr_str_raw(x, length, is_valid)

        if type(x) is unicode:
            return repr_unicode(x, length, is_valid)

        if type(x) is bytearray:
            return repr_bytearray(x, length, encoding, is_valid)

        if type(x) is bytes:
            return repr_bytes(x, length, encoding, is_valid)

        if type(x) is str8:
            return repr_str8(x, length, encoding, is_valid)

        if type(x) is str:
            return repr_str(x, length, encoding, is_valid)

        if [True for t in [bool, int, float, long, type(None)] if t is type(x)]:
            return repr_base(x, length, is_valid)

        is_valid[0] = False

        y = safe_repr(x)[: length]
        if len(y) == length:
            y += '...'

        if encoding == ENCODING_RAW_I:
            encoding = 'utf-8'

        try:
            y = as_unicode(y, encoding, fstrict = True)
            return y
            
        except:
            pass

        encoding = sys.getfilesystemencoding()
        y = as_unicode(y, encoding)

        return y

    except:
        print_debug_exception()
        return as_unicode('N/A')



def print_debug(_str):
    if not g_fDebug:
        return

    t = time.time()
    l = time.localtime(t)
    s = time.strftime('%H:%M:%S', l) + '.%03d' % ((t - int(t)) * 1000)

    f = sys._getframe(1)
    
    filename = os.path.basename(f.f_code.co_filename)
    lineno = f.f_lineno
    name = f.f_code.co_name

    str = '%s %s:%d in %s: %s' % (s, filename, lineno, name, _str)

    _print(str, sys.__stderr__)



def print_debug_exception(fForce = False):
    """
    Print exceptions to stdout when in debug mode.
    """
    
    if not g_fDebug and not fForce:
        return

    (t, v, tb) = sys.exc_info()
    print_exception(t, v, tb, fForce)

       

class CFileWrapper:
    def __init__(self, f):
        self.m_f = f


    def write(self, s):
        _print(s, self.m_f, feol = False) 


    def __getattr__(self, name):
        return self.m_f.__getattr__(name)



def print_exception(t, v, tb, fForce = False):
    """
    Print exceptions to stderr when in debug mode.
    """
    
    if not g_fDebug and not fForce:
        return
        
    try:
        g_traceback_lock.acquire()
        traceback.print_exception(t, v, tb, file = CFileWrapper(sys.stderr))
        
    finally:    
        g_traceback_lock.release()

       

def print_stack():
    """
    Print exceptions to stdout when in debug mode.
    """
    
    if g_fDebug == True:
        try:
            g_traceback_lock.acquire()
            traceback.print_stack(file = CFileWrapper(sys.stderr))
            
        finally:    
            g_traceback_lock.release()

       

#
# myisfile() is similar to os.path.isfile() but also works with
# Python eggs.
#
def myisfile(path):
    try:
        mygetfile(path, False)
        return True

    except:
        return False

       

#
# Read a file even if inside a Python egg.
#
def mygetfile(path, fread_file = True):
    if os.path.isfile(path):
        if not fread_file:
            return
        
        if sys.platform == 'OpenVMS':
            #
            # OpenVMS filesystem does not support byte stream.
            #
            mode = 'r'
        else:
            mode = 'rb'

        f = open(path, mode)
        data = f.read()
        f.close()
        return data

    d = os.path.dirname(path)

    while True:
        if os.path.exists(d):
            break

        _d = os.path.dirname(d)
        if _d in [d, '']:
            raise IOError

        d = _d

    if not zipfile.is_zipfile(d):
        raise IOError

    z = zipimport.zipimporter(d)

    try:
        data = z.get_data(path[len(d) + 1:])
        return data

    except:
        raise IOError



def split_command_line_path_filename_args(command_line):
    """
    Split command line to a 3 elements tuple (path, filename, args)
    """
    
    command_line = command_line.strip()
    if len(command_line) == 0:
        return ('', '', '')

    if myisfile(command_line):
        (_path, _filename) = split_path(command_line)
        return (_path, _filename, '')
        
    if command_line[0] in ['"', "'"]:
        _command_line = command_line[1:]
        i = _command_line.find(command_line[0])
        if i == -1:
            (_path, filename) = split_path(_command_line)
            return (_path, filename, '')
        else:
            (_path, filename) = split_path(_command_line[: i])
            args = _command_line[i + 1:].strip()
            return (_path, filename, args)
    else:
        i = command_line.find(' ')
        if i == -1:
            (_path, filename) = split_path(command_line)
            return (_path, filename, '')
        else:
            args = command_line[i + 1:].strip()
            (_path, filename) = split_path(command_line[: i])
            return (_path, filename, args)



def split_path(path):
    (_path, filename) = os.path.split(path)

    #
    # Make sure path separator (e.g. '/') ends the splitted path if it was in
    # the original path.
    #
    if (_path[-1:] not in [os.path.sep, os.path.altsep]) and \
        (path[len(_path): len(_path) + 1] in [os.path.sep, os.path.altsep]):
        _path = _path + path[len(_path): len(_path) + 1]
        
    return (_path, filename)



def my_os_path_join(dirname, basename):
    if is_py3k() or (type(dirname) == str and type(basename) == str):
        return os.path.join(dirname, basename)

    encoding = sys.getfilesystemencoding()

    if type(dirname) == str:
        dirname = dirname.decode(encoding)

    if type(basename) == str:
        basename = basename.decode(encoding)

    return os.path.join(dirname, basename)



def calc_frame_path(frame):
    globals_filename = frame.f_globals.get('__file__', None)
    filename = frame.f_code.co_filename
    
    if filename.startswith('<'):
        if globals_filename == None:
            return filename
        else:
            filename = CalcScriptName(os.path.basename(globals_filename))

    if filename in g_frames_path:
        return g_frames_path[filename]
    
    if globals_filename != None:
        dirname = os.path.dirname(globals_filename)
        basename = os.path.basename(filename)
        path = my_os_path_join(dirname, basename)        

        if os.path.isabs(path):    
            abspath = my_abspath(path)
            lowered = winlower(abspath)        
            g_frames_path[filename] = lowered
            return lowered

        try:
            abspath = FindFile(path, fModules = True)
            lowered = winlower(abspath)    
            g_frames_path[filename] = lowered
            return lowered

        except IOError:
            pass

    if os.path.isabs(filename):
        abspath = my_abspath(filename)
        lowered = winlower(abspath)
        g_frames_path[filename] = lowered
        return lowered
        
    try:
        abspath = FindFile(filename, fModules = True)
        lowered = winlower(abspath)    
        g_frames_path[filename] = lowered
        return lowered

    except IOError:
        lowered = winlower(filename)    
        return lowered
        
            

def my_abspath(path):
    """
    We need our own little version of os.path.abspath since the original
    code imports modules in the 'nt' code path which can cause our debugger
    to deadlock in unexpected locations.
    """
    
    if path[:1] == '<':
        #
        # 'path' may also be '<stdin>' in which case it is left untouched.
        #
        return path

    if os.name == 'nt':
        return my_abspath1(path)

    return  os.path.abspath(path)   



#
# MOD
#
def my_abspath1(path):
    """
    Modification of ntpath.abspath() that avoids doing an import.
    """
    
    if path:
        try:
            path = _getfullpathname(path)
        except WindowsError:
            pass
    else:
        try:
            path = getcwd()

        except UnicodeDecodeError:
            #
            # This exception can be raised in py3k (alpha) on nt.
            #
            path = getcwdu()
        
    np = os.path.normpath(path)

    if (len(np) >= 2) and (np[1:2] == ':'):
        np = np[:1].upper() + np[1:]

    return np    



def IsPythonSourceFile(path):
    if path.endswith(PYTHON_FILE_EXTENSION):
        return True
        
    if path.endswith(PYTHONW_FILE_EXTENSION):
        return True

    path = g_found_unicode_files.get(path, path)

    for lineno in range(1, 10):
        line = get_source_line(path, lineno)

        if line.startswith('#!') and 'python' in line:
            return True

    if is_py3k():
        #
        # py3k does not have compiler.parseFile, so return
        # True anyway...
        #
        return True

    try:
        compiler.parseFile(path) 
        return True

    except:
        return False



def CalcModuleName(filename):
    _basename = os.path.basename(filename)
    (modulename, ext) = os.path.splitext(_basename)

    if ext in PYTHON_EXT_LIST:
        return modulename

    return  _basename   



def CalcScriptName(filename, fAllowAnyExt = True):
    if filename.endswith(PYTHON_FILE_EXTENSION):
        return filename
        
    if filename.endswith(PYTHONW_FILE_EXTENSION):
        return filename
        
    if filename.endswith(PYTHONW_SO_EXTENSION):
        scriptname = filename[:-3] + PYTHON_FILE_EXTENSION
        return scriptname

    if filename[:-1].endswith(PYTHON_FILE_EXTENSION):
        scriptname = filename[:-1]
        return scriptname

    if fAllowAnyExt:
        return filename

    scriptname = filename + PYTHON_FILE_EXTENSION
        
    return scriptname
        


def FindModuleDir(module_name):
    if module_name == '':
        raise IOError
        
    dot_index = module_name.rfind('.')
    if dot_index != -1:
        parent = module_name[: dot_index]
        child = module_name[dot_index + 1:]
    else:
        parent = ''
        child = module_name
    
    m = sys.modules[module_name]
    
    if not hasattr(m, '__file__') or m.__file__ == None:
        parent_dir = FindModuleDir(parent)
        module_dir = my_os_path_join(parent_dir, winlower(child))
        return module_dir

    if not os.path.isabs(m.__file__):
        parent_dir = FindModuleDir(parent)
        module_dir = my_os_path_join(parent_dir, winlower(child))
        return module_dir        
        
    (root, ext) = os.path.splitext(m.__file__)
    if root.endswith('__init__'):
        root = os.path.dirname(root)
    
    abspath = my_abspath(root)
    lowered = winlower(abspath)

    return lowered
    

    
def FindFileAsModule(filename):
    lowered = winlower(filename)
    (root, ext) = os.path.splitext(lowered)
    
    root_dotted = root.replace('\\', '.').replace('/', '.').replace(':', '.')

    match_list = []    
    for (module_name, m) in list(sys.modules.items()):
        lowered_module_name = winlower(module_name)
        if (root_dotted + '.').startswith(lowered_module_name + '.'):
            match_list.append((len(module_name), module_name))

            if lowered_module_name == root_dotted:
                break

    match_list.sort()
    match_list.reverse()
    
    for (matched_len, matched_module) in match_list:
        try:
            module_dir = FindModuleDir(matched_module)
        except IOError:
            continue
        
        suffix = root[matched_len:]        
        if suffix == '':
            path = module_dir + ext
        else:    
            path = my_os_path_join(module_dir, suffix.strip('\\')) + ext
        
        scriptname = CalcScriptName(path, fAllowAnyExt = False)
        if myisfile(scriptname):
            return scriptname

        #
        # Check .pyw files
        #
        scriptname += 'w'
        if scriptname.endswith(PYTHONW_FILE_EXTENSION) and myisfile(scriptname):
            return scriptname
        
    raise IOError



def getcwd():
    try:
        return os.getcwd()

    except UnicodeDecodeError:
        print_debug_exception(True)
        raise



def getcwdu():
    if hasattr(os, 'getcwdu'):
        return os.getcwdu()

    return getcwd()



def FindFile(
        filename, 
        sources_paths = [], 
        fModules = False, 
        fAllowAnyExt = True
        ):
        
    """ 
    FindFile looks for the full path of a script in a rather non-strict
    and human like behavior.

    ENCODING:
    filename should be either Unicode or encoded with sys.getfilesystemencoding()!
    Returned value is encoded with sys.getfilesystemencoding().

    It will always look for .py or .pyw files even if a .pyc or no 
    extension is given.

    1. It will check against loaded modules if asked.
    1. full path (if exists).
    2. sources_paths.
    2. current path.
    3. PYTHONPATH
    4. PATH
    """

    if filename in g_found_unicode_files:
        return filename

    if filename.startswith('<'):
        raise IOError
        
    filename = filename.strip('\'"')
    filename = os.path.expanduser(filename)

    if fModules and not (os.path.isabs(filename) or filename.startswith('.')):
        try:    
            return winlower(FindFileAsModule(filename))
        except IOError:
            pass
                
    if fAllowAnyExt:
        try:
            abspath = FindFile(
                            filename, 
                            sources_paths, 
                            fModules = False, 
                            fAllowAnyExt = False
                            )
            return abspath
        except IOError:
            pass

    if os.path.isabs(filename) or filename.startswith('.'):
        try:
            scriptname = None

            abspath = my_abspath(filename)
            lowered = winlower(abspath)
            scriptname = CalcScriptName(lowered, fAllowAnyExt)
            
            if myisfile(scriptname):
                return scriptname

            #
            # Check .pyw files
            #
            scriptname += 'w'
            if scriptname.endswith(PYTHONW_FILE_EXTENSION) and myisfile(scriptname):
                return scriptname
            
            scriptname = None
            raise IOError

        finally:
            if not is_py3k() and is_unicode(scriptname):
                fse = sys.getfilesystemencoding()
                _l = as_string(scriptname, fse)
                if '?' in _l:
                    g_found_unicode_files[_l] = scriptname
                return _l

    scriptname = CalcScriptName(filename, fAllowAnyExt)
       
    try:
        cwd = [getcwd(), getcwdu()]
    
    except UnicodeDecodeError:
        #
        # This exception can be raised in py3k (alpha) on nt.
        #
        cwd = [getcwdu()]

    env_path = os.environ['PATH']
    paths = sources_paths + cwd + g_initial_cwd + sys.path + env_path.split(os.pathsep)
    
    try:
        lowered = None

        for p in paths:
            f = my_os_path_join(p, scriptname)
            abspath = my_abspath(f)
            lowered = winlower(abspath)
            
            if myisfile(lowered):
                return lowered

            #
            # Check .pyw files
            #
            lowered += 'w'
            if lowered.endswith(PYTHONW_FILE_EXTENSION) and myisfile(lowered):
                return lowered

        lowered = None
        raise IOError

    finally:
        if not is_py3k() and is_unicode(lowered):
            fse = sys.getfilesystemencoding()
            _l = as_string(lowered, fse)
            if '?' in _l:
                g_found_unicode_files[_l] = lowered
            return _l



def IsFileInPath(filename):
    if filename == '':
        return False

    try:
        FindFile(filename)
        return True
        
    except IOError:
        return False



def IsPrefixInEnviron(_str):
    for e in os.environ.keys():
        if e.startswith(_str):
            return True

    return False
    


def CalcTerminalCommand():
    """
    Calc the unix command to start a new terminal, for example: xterm
    """
    
    if RPDBTERM in os.environ:
        term = os.environ[RPDBTERM]
        if IsFileInPath(term):
            return term

    if COLORTERM in os.environ:
        term = os.environ[COLORTERM]
        if IsFileInPath(term):
            return term

    if IsPrefixInEnviron(KDE_PREFIX):
        (s, term) = commands.getstatusoutput(KDE_DEFAULT_TERM_QUERY)
        if (s == 0) and IsFileInPath(term):
            return term
            
    elif IsPrefixInEnviron(GNOME_PREFIX):
        if IsFileInPath(GNOME_DEFAULT_TERM):
            return GNOME_DEFAULT_TERM
        
    if IsFileInPath(XTERM):
        return XTERM

    if IsFileInPath(RXVT):
        return RXVT

    raise SpawnUnsupported    



def CalcMacTerminalCommand(command):
    """
    Calculate what to put in popen to start a given script.
    Starts a tiny Applescript that performs the script action.
    """

    #
    # Quoting is a bit tricky; we do it step by step.
    # Make Applescript string: put backslashes before double quotes and 
    # backslashes.
    #
    command = command.replace('\\', '\\\\').replace('"', '\\"')

    #
    # Make complete Applescript command.
    #
    command = 'tell application "Terminal" to do script "%s"' % command

    #
    # Make a shell single quoted string (put backslashed single quotes 
    # outside string).
    #
    command = command.replace("'", "'\\''")

    #
    # Make complete shell command.
    #
    return "osascript -e '%s'" % command



def winlower(path):
    """
    return lowercase version of 'path' on NT systems.
    
    On NT filenames are case insensitive so lowercase filenames
    for comparison purposes on NT.
    """
    
    if os.name == 'nt':
        return path.lower()

    return path
    
    


def source_provider_blender(filename):
    """
    Return source code of the file referred by filename.
    
    Support for debugging of Blender Python scripts.
    Blender scripts are not always saved on disk, and their 
    source has to be queried directly from the Blender API.
    http://www.blender.org
    """

    if not 'Blender.Text' in sys.modules:
        raise IOError

    if filename.startswith('<'):
        #
        # This specifies blender source whose source is not
        # available.
        #
        raise IOError(BLENDER_SOURCE_NOT_AVAILABLE)
        
    _filename = os.path.basename(filename)

    try:
        t = sys.modules['Blender.Text'].get(_filename)
        lines = t.asLines()
        return '\n'.join(lines) + '\n'
        
    except NameError:
        f = winlower(_filename)
        tlist = sys.modules['Blender.Text'].get()

        t = None
        for _t in tlist:
            n = winlower(_t.getName())
            if n == f:
                t = _t
                break
        
        if t == None:
            #
            # filename does not specify a blender file. Raise IOError
            # so that search can continue on file system.
            #
            raise IOError

        lines = t.asLines()
        return '\n'.join(lines) + '\n'



def source_provider_filesystem(filename):
    l = mygetfile(filename)

    if l[:3] == as_bytes(ENCODING_UTF8_PREFIX_1):
        l = l[3:]
     
    return l



def source_provider(filename):
    source = None
    ffilesystem = False

    try:
        if g_source_provider_aux != None:
            source = g_source_provider_aux(filename)
    
    except IOError:
        v = sys.exc_info()[1]
        if SOURCE_NOT_AVAILABLE in v.args:
            raise

    try:
        if source == None:
            source = source_provider_blender(filename)
    
    except IOError:
        v = sys.exc_info()[1]
        if BLENDER_SOURCE_NOT_AVAILABLE in v.args:
            raise

    if source == None:
        source = source_provider_filesystem(filename)
        ffilesystem = True

    encoding = ParseEncoding(source)

    if not is_unicode(source):
        source = as_unicode(source, encoding)

    return source, encoding, ffilesystem



def lines_cache(filename):
    filename = g_found_unicode_files.get(filename, filename)

    if filename in g_lines_cache:
        return g_lines_cache[filename]

    (source, encoding, ffilesystem) = source_provider(filename)
    source = source.replace(as_unicode('\r\n'), as_unicode('\n'))

    lines = source.split(as_unicode('\n'))

    g_lines_cache[filename] = (lines, encoding, ffilesystem)

    return (lines, encoding, ffilesystem)



def get_source(filename):
    (lines, encoding, ffilesystem) = lines_cache(filename)
    source = as_unicode('\n').join(lines) 

    return (source, encoding)



def get_source_line(filename, lineno):
    (lines, encoding, ffilesystem) = lines_cache(filename)

    if lineno > len(lines):
        return as_unicode('')
    
    return lines[lineno - 1] + as_unicode('\n')



def is_provider_filesystem(filename):
    try:
        (lines, encoding, ffilesystem) = lines_cache(filename)
        return ffilesystem

    except IOError:
        v = sys.exc_info()[1]
        return not (BLENDER_SOURCE_NOT_AVAILABLE in v.args or SOURCE_NOT_AVAILABLE in v.args)



def get_file_encoding(filename):
    (lines, encoding, ffilesystem) = lines_cache(filename)
    return encoding



def ParseLineEncoding(l):
    if l.startswith('# -*- coding: '):
        e = l[len('# -*- coding: '):].split()[0]
        return e

    if l.startswith('# vim:fileencoding='):
        e = l[len('# vim:fileencoding='):].strip()
        return e

    return None    

        
        
def ParseEncoding(txt):
    """
    Parse document encoding according to: 
    http://docs.python.org/ref/encodings.html
    """
   
    eol = '\n'
    if not is_unicode(txt):
        eol = as_bytes('\n')

    l = txt.split(eol, 20)[:-1]

    for line in l:
        line = as_unicode(line)
        encoding = ParseLineEncoding(line)
        if encoding is not None:
            try:
                codecs.lookup(encoding)
                return encoding

            except:
                return 'utf-8'

    return 'utf-8'



def _getpid():
    try:
        return os.getpid()
    except:
        return -1



def calcURL(host, port):
    """
    Form HTTP URL from 'host' and 'port' arguments.
    """
    
    url = "http://" + str(host) + ":" + str(port)
    return url
    
    

def GetSocketError(e):
    if (not isinstance(e.args, tuple)) or (len(e.args) == 0):
        return -1

    return e.args[0]



def ControlRate(t_last_call, max_rate):
    """
    Limits rate at which this function is called by sleeping.
    Returns the time of invocation.
    """
    
    p = 1.0 / max_rate
    t_current = time.time()
    dt = t_current - t_last_call

    if dt < p:
        time.sleep(p - dt)

    return t_current



def generate_rid():
    """
    Return a 7 digits random id.
    """
    
    rid = repr(random.randint(1000000, 9999999))
    rid = as_unicode(rid)

    return rid



def generate_random_char(_str):
    """
    Return a random character from string argument.
    """
    
    if _str == '':
        return ''
        
    i = random.randint(0, len(_str) - 1)
    return _str[i]



def generate_random_password():
    """
    Generate an 8 characters long password.
    """
    
    s = 'abdefghijmnqrt' + 'ABDEFGHJLMNQRTY'
    ds = '23456789_' + s
        
    _rpdb2_pwd = generate_random_char(s)

    for i in range(0, 7):
        _rpdb2_pwd += generate_random_char(ds)

    _rpdb2_pwd = as_unicode(_rpdb2_pwd)

    return _rpdb2_pwd    



def is_valid_pwd(_rpdb2_pwd):
    if _rpdb2_pwd in [None, '']:
        return False

    try:
        if not is_unicode(_rpdb2_pwd):
            _rpdb2_pwd = _rpdb2_pwd.decode('ascii')

        _rpdb2_pwd.encode('ascii')

    except:
        return False

    for c in _rpdb2_pwd:
        if c.isalnum():
            continue

        if c == '_':
            continue

        return False

    return True



def is_encryption_supported():
    """
    Is the Crypto module imported/available.
    """
    
    return 'DES' in globals()



def calc_suffix(_str, n):
    """
    Return an n charaters suffix of the argument string of the form
    '...suffix'.
    """
    
    if len(_str) <= n:
        return _str

    return '...' + _str[-(n - 3):]


    
def calc_prefix(_str, n):
    """
    Return an n charaters prefix of the argument string of the form
    'prefix...'.
    """
    
    if len(_str) <= n:
        return _str

    return _str[: (n - 3)] + '...'



def create_rpdb_settings_folder():
    """
    Create the settings folder on Posix systems:
    '~/.rpdb2_settings' with mode 700.
    """
    
    if os.name != POSIX:
        return
        
    home = os.path.expanduser('~')

    rsf = os.path.join(home, RPDB_SETTINGS_FOLDER)
    if not os.path.exists(rsf):
        os.mkdir(rsf, int('0700', 8))

    pwds = os.path.join(home, RPDB_PWD_FOLDER)    
    if not os.path.exists(pwds):
        os.mkdir(pwds, int('0700', 8))

    bpl = os.path.join(home, RPDB_BPL_FOLDER)    
    if not os.path.exists(bpl):
        os.mkdir(bpl, int('0700', 8))



def cleanup_bpl_folder(path):
    if random.randint(0, 10) > 0:
        return

    l = os.listdir(path)
    if len(l) < MAX_BPL_FILES:
        return
    
    try:
        ll = [(os.stat(os.path.join(path, f))[stat.ST_ATIME], f) for f in l]
    except:
        return
        
    ll.sort()

    for (t, f) in ll[: -MAX_BPL_FILES]:
        try:
            os.remove(os.path.join(path, f))
        except:
            pass

        

def calc_bpl_filename(filename):
    key = as_bytes(filename)
    tmp_filename = hmac.new(key).hexdigest()[:10]

    if os.name == POSIX:
        home = os.path.expanduser('~')
        bpldir = os.path.join(home, RPDB_BPL_FOLDER)
        cleanup_bpl_folder(bpldir)
        path = os.path.join(bpldir, tmp_filename) + BREAKPOINTS_FILE_EXT
        return path

    #
    # gettempdir() is used since it works with unicode user names on 
    # Windows.
    #
        
    tmpdir = tempfile.gettempdir()
    bpldir = os.path.join(tmpdir, RPDB_BPL_FOLDER_NT)

    if not os.path.exists(bpldir):
        #
        # Folder creation is done here since this is a temp folder.
        #
        try:
            os.mkdir(bpldir, int('0700', 8))
        except:
            print_debug_exception()
            raise CException

    else:    
        cleanup_bpl_folder(bpldir)
        
    path = os.path.join(bpldir, tmp_filename) + BREAKPOINTS_FILE_EXT
    return path
    

    
def calc_pwd_file_path(rid):
    """
    Calc password file path for Posix systems:
    '~/.rpdb2_settings/<rid>'
    """
    
    home = os.path.expanduser('~')
    rsf = os.path.join(home, RPDB_PWD_FOLDER)
    pwd_file_path = os.path.join(rsf, rid)
    
    return pwd_file_path

            

def create_pwd_file(rid, _rpdb2_pwd):
    """
    Create password file for Posix systems.
    """
    
    if os.name != POSIX:
        return

    path = calc_pwd_file_path(rid)

    fd = os.open(path, os.O_WRONLY | os.O_CREAT, int('0600', 8))
    
    os.write(fd, _rpdb2_pwd)
    os.close(fd)
    
        

def read_pwd_file(rid):
    """
    Read password from password file for Posix systems.
    """

    assert(os.name == POSIX)

    path = calc_pwd_file_path(rid)

    p = open(path, 'r')
    _rpdb2_pwd = p.read()
    p.close()

    _rpdb2_pwd = as_unicode(_rpdb2_pwd, fstrict = True)

    return _rpdb2_pwd
    
    
    
def delete_pwd_file(rid):
    """
    Delete password file for Posix systems.
    """

    if os.name != POSIX:
        return

    path = calc_pwd_file_path(rid)

    try:
        os.remove(path)
    except:
        pass



def CalcUserShell():
    try:
        s = os.getenv('SHELL')
        if s != None:
            return s

        import getpass
        username = getpass.getuser()

        f = open('/etc/passwd', 'r')
        l = f.read()
        f.close()

        ll = l.split('\n')
        d = dict([(e.split(':', 1)[0], e.split(':')[-1]) for e in ll])

        return d[username]

    except:
        return 'sh'



def IsFilteredAttribute(a):
    if not (a.startswith('__') and a.endswith('__')):
        return False

    if a in ['__class__', '__bases__', '__file__', '__doc__', '__name__', '__all__', '__builtins__']:
        return False

    return True



def IsFilteredAttribute2(r, a):
    try:
        o = getattr(r, a)
        r = parse_type(type(o))

        if 'function' in r or 'method' in r or r == 'type':
            return True

        return False

    except:
        return False



def CalcFilteredDir(r, filter_level):
    d = dir(r)

    if 'finfo' in d and parse_type(type(r)) == 'mp_request':
        #
        # Workaround mod_python segfault in type(req.finfo) by
        # removing this attribute from the namespace viewer.
        #
        d.remove('finfo')

    if filter_level == 0:
        return d

    fd = [a for a in d if not IsFilteredAttribute(a)]

    return fd



def CalcIdentity(r, filter_level):
    if filter_level == 0:
        return r

    if not hasattr(r, 'im_func'):
        return r

    return r.im_func



def getattr_nothrow(o, a):
    try:
        return getattr(o, a)

    except AttributeError:
        return ERROR_NO_ATTRIBUTE

    except:
        print_debug_exception()
        return ERROR_NO_ATTRIBUTE



def calc_attribute_list(r, filter_level):
    d = CalcFilteredDir(r, filter_level)
    rs = set(d)

    c = getattr_nothrow(r, '__class__')
    if not c is ERROR_NO_ATTRIBUTE:
        d = CalcFilteredDir(c, False)
        cs = set(d)
        s = rs & cs

        for e in s:
            o1 = getattr_nothrow(r, e)
            o2 = getattr_nothrow(c, e)

            if o1 is ERROR_NO_ATTRIBUTE or CalcIdentity(o1, filter_level) is CalcIdentity(o2, filter_level):
                rs.discard(e)

            try:
                if filter_level == 1 and getattr(o1, '__self__') is getattr(o2, '__self__'):
                    rs.discard(e)
            except:
                pass

    bl = getattr_nothrow(r, '__bases__')
    if type(bl) == tuple:
        for b in bl:
            d = CalcFilteredDir(b, False)
            bs = set(d)
            s = rs & bs

            for e in s:
                o1 = getattr_nothrow(r, e)
                o2 = getattr_nothrow(b, e)

                if o1 is ERROR_NO_ATTRIBUTE or CalcIdentity(o1, filter_level) is CalcIdentity(o2, filter_level):
                    rs.discard(e)

                try:
                    if filter_level == 1 and getattr(o1, '__self__') is getattr(o2, '__self__'):
                        rs.discard(e)
                except:
                    pass
      
    l = [a for a in rs if (filter_level < 2 or not IsFilteredAttribute2(r, a))]

    if hasattr(r, '__class__') and not '__class__' in l:
        l = ['__class__'] + l

    if hasattr(r, '__bases__') and not '__bases__' in l:
        l = ['__bases__'] + l

    al = [a for a in l if hasattr(r, a)]

    return al



class _RPDB2_FindRepr:
    def __init__(self, o, repr_limit):
        self.m_object = o
        self.m_repr_limit = repr_limit


    def __getitem__(self, key):
        index = 0
        for i in self.m_object:
            if repr_ltd(i, self.m_repr_limit, encoding = ENCODING_RAW_I).replace('"', '&quot') == key:
                if isinstance(self.m_object, dict):
                    return self.m_object[i]

                return i

            index += 1
            if index > MAX_SORTABLE_LENGTH:
                return None


    def __setitem__(self, key, value):
        if not isinstance(self.m_object, dict):
            return 

        index = 0
        for i in self.m_object:
            if repr_ltd(i, self.m_repr_limit, encoding = ENCODING_RAW_I).replace('"', '&quot') == key:
                self.m_object[i] = value
                return

            index += 1
            if index > MAX_SORTABLE_LENGTH:
                return



#
# Since on Python 3000 the comparison of different types raises exceptions and 
# the __cmp__ method was removed, sorting of namespace items is based on 
# lexicographic order except for numbers which are sorted normally and appear 
# before all other types.
#
def sort(s):
    if sys.version_info[:2] == (2, 3):
        #
        # On Python 2.3 the key parameter is not supported.
        #
        s.sort(sort_cmp)
        return

    s.sort(key = sort_key)



def sort_key(e):
    if is_py3k() and isinstance(e, numbers.Number):
        return (0, e)

    if not is_py3k() and operator.isNumberType(e):
        return (0, e)

    return (1, repr_ltd(e, 256, encoding = ENCODING_RAW_I))



def sort_cmp(x, y):
    skx = sort_key(x)
    sky = sort_key(y)

    return cmp(skx, sky)



def recalc_sys_path(old_pythonpath):
    opl = old_pythonpath.split(os.path.pathsep)
    del sys.path[1: 1 + len(opl)]

    pythonpath = os.environ.get('PYTHONPATH', '')
    ppl = pythonpath.split(os.path.pathsep)

    for i, p in enumerate(ppl):
        abspath = my_abspath(p)
        lowered = winlower(abspath)

        sys.path.insert(1 + i, lowered)



def calc_signame(signum):
    for k, v in vars(signal).items():
        if not k.startswith('SIG') or k in ['SIG_IGN', 'SIG_DFL', 'SIGRTMIN', 'SIGRTMAX']:
            continue

        if v == signum:
            return k

    return '?'



#
# Similar to traceback.extract_stack() but fixes path with calc_frame_path()
#
def my_extract_stack(f):
    if f == None:
        return []

    try:
        g_traceback_lock.acquire()
        _s = traceback.extract_stack(f)

    finally:    
        g_traceback_lock.release()
    
    _s.reverse()

    s = []
    for (p, ln, fn, text) in _s:
        path = as_unicode(calc_frame_path(f), sys.getfilesystemencoding())
        if text == None:
            text = ''

        s.append((path, ln, as_unicode(fn), as_unicode(text)))

        f = f.f_back
        if f == None:
            break

    s.reverse()
    return s




#
# Similar to traceback.extract_tb() but fixes path with calc_frame_path()
#
def my_extract_tb(tb):
    try:
        g_traceback_lock.acquire()
        _s = traceback.extract_tb(tb)

    finally:    
        g_traceback_lock.release()

    s = []
    for (p, ln, fn, text) in _s:
        path = as_unicode(calc_frame_path(tb.tb_frame), sys.getfilesystemencoding())
        if text == None:
            text = ''

        s.append((path, ln, as_unicode(fn), as_unicode(text)))

        tb = tb.tb_next
        if tb == None:
            break

    return s



def get_traceback(frame, ctx):
    if is_py3k():
        if ctx.get_exc_info() != None:
            return ctx.get_exc_info()[2]
    else:
        if frame.f_exc_traceback != None:
            return frame.f_exc_traceback

    locals = copy.copy(frame.f_locals)
    if not 'traceback' in locals:
        return None

    tb = locals['traceback']
    if dir(tb) == ['tb_frame', 'tb_lasti', 'tb_lineno', 'tb_next']:
        return tb



class CFirewallTest:
    m_port = None
    m_thread_server = None
    m_thread_client = None
    m_lock = threading.RLock()


    def __init__(self, fremote = False, timeout = 4):
        if fremote:
            self.m_loopback = ''
        else:
            self.m_loopback = LOOPBACK

        self.m_timeout = timeout

        self.m_result = None

        self.m_last_server_error = None
        self.m_last_client_error = None


    def run(self):
        CFirewallTest.m_lock.acquire()

        try:
            #
            # If either the server or client are alive after a timeout
            # it means they are blocked by a firewall. Return False.
            #
            server = CFirewallTest.m_thread_server
            if server != None and thread_is_alive(server):
                server.join(self.m_timeout * 1.5)
                if thread_is_alive(server):
                    return False

            client = CFirewallTest.m_thread_client
            if client != None and thread_is_alive(client):
                client.join(self.m_timeout * 1.5)
                if thread_is_alive(client):
                    return False

            CFirewallTest.m_port = None
            self.m_result = None

            t0 = time.time()
            server = threading.Thread(target = self.__server)
            server.start()
            CFirewallTest.m_thread_server = server

            #
            # If server exited or failed to setup after a timeout 
            # it means it was blocked by a firewall.
            #
            while CFirewallTest.m_port == None and thread_is_alive(server):
                if time.time() - t0 > self.m_timeout * 1.5:
                    return False

                time.sleep(0.1)

            if not thread_is_alive(server):
                return False

            t0 = time.time()
            client = threading.Thread(target = self.__client)
            client.start()
            CFirewallTest.m_thread_client = client

            while self.m_result == None and thread_is_alive(client):
                if time.time() - t0 > self.m_timeout * 1.5:
                    return False

                time.sleep(0.1)

            return self.m_result

        finally:
            CFirewallTest.m_lock.release()


    def __client(self):
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.settimeout(self.m_timeout)

        try:
            try:
                s.connect((LOOPBACK, CFirewallTest.m_port))

                s.send(as_bytes('Hello, world'))
                data = self.__recv(s, 1024)
                self.m_result = True

            except socket.error:
                e = sys.exc_info()[1]
                self.m_last_client_error = e
                self.m_result = False

        finally:
            s.close()


    def __server(self):
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.settimeout(self.m_timeout)

        if os.name == POSIX:
            s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

        port = SERVER_PORT_RANGE_START

        while True:
            try:
                s.bind((self.m_loopback, port))
                break
                
            except socket.error:
                e = sys.exc_info()[1]
               
                if self.__GetSocketError(e) != errno.EADDRINUSE:
                    self.m_last_server_error = e
                    s.close()
                    return
                    
                if port >= SERVER_PORT_RANGE_START + SERVER_PORT_RANGE_LENGTH - 1:
                    self.m_last_server_error = e
                    s.close()
                    return

                port += 1
        
        CFirewallTest.m_port = port

        try:
            try:
                conn = None
                s.listen(1)
                conn, addr = s.accept()
                
                while True:
                    data = self.__recv(conn, 1024)
                    if not data: 
                        return

                    conn.send(data)

            except socket.error:
                e = sys.exc_info()[1]
                self.m_last_server_error = e

        finally:
            if conn != None:
                conn.close()
            s.close()


    def __recv(self, s, len):
        t0 = time.time()
        
        while True:
            try:
                data = s.recv(1024)
                return data

            except socket.error:
                e = sys.exc_info()[1]
                if self.__GetSocketError(e) != errno.EWOULDBLOCK:
                    print_debug('socket error was caught, %s' % repr(e))
                    raise
                
                if time.time() - t0 > self.m_timeout:
                    raise

                continue


    def __GetSocketError(self, e):
        if (not isinstance(e.args, tuple)) or (len(e.args) == 0):
            return -1

        return e.args[0]
        


#
# ---------------------------------- CThread ---------------------------------------
#



class CThread (threading.Thread):
    m_fstop = False
    m_threads = {}

    m_lock = threading.RLock()
    m_id = 0


    def __init__(self, name = None, target = None, args = (), shutdown = None):
        threading.Thread.__init__(self, name = name, target = target, args = args)

        self.m_fstarted = False
        self.m_shutdown_callback = shutdown

        self.m_id = self.__getId()


    def __del__(self):
        #print_debug('Destructor called for ' + thread_get_name(self))
        
        #threading.Thread.__del__(self)

        if self.m_fstarted:
            try:
                del CThread.m_threads[self.m_id]
            except KeyError:
                pass


    def start(self):
        if CThread.m_fstop:
            return

        CThread.m_threads[self.m_id] = weakref.ref(self)

        if CThread.m_fstop:
            del CThread.m_threads[self.m_id]
            return

        self.m_fstarted = True

        threading.Thread.start(self)


    def run(self):
        sys.settrace(None)
        sys.setprofile(None)
 
        threading.Thread.run(self)

    
    def join(self, timeout = None):
        try:
            threading.Thread.join(self, timeout)
        except AssertionError:
            pass


    def shutdown(self):
        if self.m_shutdown_callback:
            self.m_shutdown_callback()


    def joinAll(cls):
        print_debug('Shutting down debugger threads...')

        CThread.m_fstop = True

        for tid, w in list(CThread.m_threads.items()):
            t = w()
            if not t:
                continue

            try:
                #print_debug('Calling shutdown of thread %s.' % thread_get_name(t))
                t.shutdown()
            except:
                pass

            t = None

        t0 = time.time()

        while len(CThread.m_threads) > 0:
            if time.time() - t0 > SHUTDOWN_TIMEOUT:
                print_debug('Shut down of debugger threads has TIMED OUT!')
                return

            #print_debug(repr(CThread.m_threads))
            time.sleep(0.1)

        print_debug('Shut down debugger threads, done.')

    joinAll = classmethod(joinAll)


    def clearJoin(cls):
        CThread.m_fstop = False

    clearJoin = classmethod(clearJoin)


    def __getId(self):
        CThread.m_lock.acquire()
        id = CThread.m_id
        CThread.m_id += 1
        CThread.m_lock.release()

        return id

    

#
#--------------------------------------- Crypto ---------------------------------------
#



class CCrypto:
    """
    Handle authentication and encryption of data, using password protection.
    """

    m_keys = {}
    
    def __init__(self, _rpdb2_pwd, fAllowUnencrypted, rid):
        assert(is_unicode(_rpdb2_pwd))
        assert(is_unicode(rid))

        self.m_rpdb2_pwd = _rpdb2_pwd
        self.m_key = self.__calc_key(_rpdb2_pwd)
        
        self.m_fAllowUnencrypted = fAllowUnencrypted
        self.m_rid = rid

        self.m_failure_lock = threading.RLock()

        self.m_lock = threading.RLock()

        self.m_index_anchor_in = random.randint(0, 1000000000)
        self.m_index_anchor_ex = 0

        self.m_index = 0
        self.m_index_table = {}
        self.m_index_table_size = INDEX_TABLE_SIZE
        self.m_max_index = 0


    def __calc_key(self, _rpdb2_pwd):
        """
        Create and return a key from a password.
        A Weak password means a weak key.
        """
        
        if _rpdb2_pwd in CCrypto.m_keys:
            return CCrypto.m_keys[_rpdb2_pwd]

        key = as_bytes(_rpdb2_pwd)
        suffix = key[:16]
        
        d = hmac.new(key, digestmod = _md5)

        #
        # The following loop takes around a second to complete
        # and should strengthen the password by ~12 bits.
        # a good password is ~30 bits strong so we are looking
        # at ~42 bits strong key
        #
        for i in range(2 ** 12):
            d.update((key + suffix) * 16)       
            key = d.digest()
            
        CCrypto.m_keys[_rpdb2_pwd] = key

        return key
        
    
    def set_index(self, i, anchor):
        try:    
            self.m_lock.acquire()

            self.m_index = i
            self.m_index_anchor_ex = anchor
            
        finally:
            self.m_lock.release()


    def get_max_index(self):
        return self.m_max_index


    def do_crypto(self, args, fencrypt):
        """
        Sign args and possibly encrypt. 
        Return signed/encrypted string.
        """
        
        if not fencrypt and not self.m_fAllowUnencrypted:
            raise EncryptionExpected

        if fencrypt and not is_encryption_supported():
            raise EncryptionNotSupported

        (digest, s) = self.__sign(args)

        fcompress = False

        if len(s) > 50000:
            _s = zlib.compress(s)

            if len(_s) < len(s) * 0.4:
                s = _s
                fcompress = True
            
        if fencrypt:
            s = self.__encrypt(s)

        s = base64.encodestring(s)
        u = as_unicode(s)
        
        return (fcompress, digest, u)


    def undo_crypto(self, fencrypt, fcompress, digest, msg, fVerifyIndex = True):
        """
        Take crypto string, verify its signature and decrypt it, if
        needed.
        """

        if not fencrypt and not self.m_fAllowUnencrypted:
            raise EncryptionExpected

        if fencrypt and not is_encryption_supported():
            raise EncryptionNotSupported

        s = as_bytes(msg)
        s = base64.decodestring(s)

        if fencrypt:
            s = self.__decrypt(s)

        if fcompress:
            s = zlib.decompress(s)

        args, id = self.__verify_signature(digest, s, fVerifyIndex)

        return (args, id)

    
    def __encrypt(self, s):
        s_padded = s + as_bytes('\x00') * (DES.block_size - (len(s) % DES.block_size))

        key_padded = (self.m_key + as_bytes('0') * (DES.key_size - (len(self.m_key) % DES.key_size)))[:DES.key_size]
        iv = '0' * DES.block_size
        
        d = DES.new(key_padded, DES.MODE_CBC, iv)
        r = d.encrypt(s_padded)

        return r


    def __decrypt(self, s):
        try:
            key_padded = (self.m_key + as_bytes('0') * (DES.key_size - (len(self.m_key) % DES.key_size)))[:DES.key_size]
            iv = '0' * DES.block_size
            
            d = DES.new(key_padded, DES.MODE_CBC, iv)
            _s = d.decrypt(s).strip(as_bytes('\x00'))

            return _s
            
        except:
            self.__wait_a_little()
            raise DecryptionFailure


    def __sign(self, args):
        i = self.__get_next_index()
        pack = (self.m_index_anchor_ex, i, self.m_rid, args)
        
        #print_debug('***** 1' + repr(args)[:50]) 
        s = pickle.dumps(pack, 2)
        #print_debug('***** 2' + repr(args)[:50]) 
        
        h = hmac.new(self.m_key, s, digestmod = _md5)
        d = h.hexdigest()

        #if 'coding:' in s:
        #    print_debug('%s, %s, %s\n\n==========\n\n%s' % (len(s), d, repr(args), repr(s)))

        return (d, s)


    def __get_next_index(self):
        try:    
            self.m_lock.acquire()

            self.m_index += 1
            return self.m_index

        finally:
            self.m_lock.release()


    def __verify_signature(self, digest, s, fVerifyIndex):
        try:
            h = hmac.new(self.m_key, s, digestmod = _md5)
            d = h.hexdigest()

            #if 'coding:' in s:
            #    print_debug('%s, %s, %s, %s' % (len(s), digest, d, repr(s)))

            if d != digest:
                self.__wait_a_little()
                raise AuthenticationFailure

            pack = pickle.loads(s)
            (anchor, i, id, args) = pack
                
        except AuthenticationFailure:
            raise

        except:
            print_debug_exception()
            self.__wait_a_little()
            raise AuthenticationBadData
            
        if fVerifyIndex:
            self.__verify_index(anchor, i, id)

        return args, id

        
    def __verify_index(self, anchor, i, id):
        """
        Manage messages ids to prevent replay of old messages.
        """
        
        try:
            try:    
                self.m_lock.acquire()

                if anchor != self.m_index_anchor_in:
                    raise AuthenticationBadIndex(self.m_max_index, self.m_index_anchor_in)

                if i > self.m_max_index + INDEX_TABLE_SIZE // 2:
                    raise AuthenticationBadIndex(self.m_max_index, self.m_index_anchor_in)

                i_mod = i % INDEX_TABLE_SIZE
                (iv, idl) = self.m_index_table.get(i_mod, (None, None))

                #print >> sys.__stderr__, i, i_mod, iv, self.m_max_index

                if (iv is None) or (i > iv):
                    idl = [id]
                elif (iv == i) and (not id in idl):
                    idl.append(id)
                else:
                    raise AuthenticationBadIndex(self.m_max_index, self.m_index_anchor_in)

                self.m_index_table[i_mod] = (i, idl) 

                if i > self.m_max_index:
                    self.m_max_index = i

                return self.m_index

            finally:
                self.m_lock.release()
                
        except:        
            self.__wait_a_little()
            raise


    def __wait_a_little(self):
        self.m_failure_lock.acquire()
        time.sleep((1.0 + random.random()) / 2)
        self.m_failure_lock.release()


        
#
# --------------------------------- Events List --------------------------
#



class CEvent(object):
    """
    Base class for events.
    """
  
    def __reduce__(self):
        rv = (copy_reg.__newobj__, (type(self), ), vars(self), None, None)
        return rv


    def is_match(self, arg):
        pass



class CEventNull(CEvent):
    """
    Sent to release event listeners (Internal, speeds up shutdown).
    """
    
    pass



class CEventEmbeddedSync(CEvent):
    """
    Sent when an embedded interpreter becomes active if it needs to 
    determine if there are pending break requests. (Internal)
    """

    pass



class CEventClearSourceCache(CEvent):
    """
    Sent when the source cache is cleared.
    """

    pass



class CEventSignalIntercepted(CEvent):
    """
    This event is sent when a signal is intercepted inside tracing code.
    Such signals are held pending until tracing code is returned from.
    """
    
    def __init__(self, signum):
        self.m_signum = signum
        self.m_signame = calc_signame(signum)



class CEventSignalException(CEvent):
    """
    This event is sent when the handler of a previously intercepted signal
    raises an exception. Such exceptions are ignored because of technical 
    limitations.
    """

    def __init__(self, signum, description):
        self.m_signum = signum
        self.m_signame = calc_signame(signum)
        self.m_description = description



class CEventEncoding(CEvent):
    """
    The encoding has been set.
    """

    def __init__(self, encoding, fraw):
        self.m_encoding = encoding
        self.m_fraw = fraw



class CEventPsycoWarning(CEvent):
    """
    The psyco module was detected. rpdb2 is incompatible with this module.
    """
    
    pass



class CEventConflictingModules(CEvent):
    """
    Conflicting modules were detected. rpdb2 is incompatible with these modules.
    """
    
    def __init__(self, modules_list):
        self.m_modules_list = modules_list



class CEventSyncReceivers(CEvent):
    """
    A base class for events that need to be received by all listeners at
    the same time. The synchronization mechanism is internal to rpdb2.
    """

    def __init__(self, sync_n):
        self.m_sync_n = sync_n



class CEventForkSwitch(CEventSyncReceivers):
    """
    Debuggee is about to fork. Try to reconnect.
    """

    pass



class CEventExecSwitch(CEventSyncReceivers):
    """
    Debuggee is about to exec. Try to reconnect.
    """

    pass



class CEventExit(CEvent):
    """
    Debuggee is terminating.
    """
    
    pass
    

    
class CEventState(CEvent):
    """
    State of the debugger.
    Value of m_state can be one of the STATE_* globals.
    """
    
    def __init__(self, state):
        self.m_state = as_unicode(state)


    def is_match(self, arg):
        return self.m_state == as_unicode(arg)



class CEventSynchronicity(CEvent):
    """
    Mode of synchronicity.
    Sent when mode changes.
    """

    def __init__(self, fsynchronicity):
        self.m_fsynchronicity = fsynchronicity


    def is_match(self, arg):
        return self.m_fsynchronicity == arg



class CEventTrap(CEvent):
    """
    Mode of "trap unhandled exceptions".
    Sent when the mode changes.
    """
    
    def __init__(self, ftrap):
        self.m_ftrap = ftrap


    def is_match(self, arg):
        return self.m_ftrap == arg



class CEventForkMode(CEvent):
    """
    Mode of fork behavior has changed.
    Sent when the mode changes.
    """
    
    def __init__(self, ffork_into_child, ffork_auto):
        self.m_ffork_into_child = ffork_into_child
        self.m_ffork_auto = ffork_auto



class CEventUnhandledException(CEvent):
    """
    Unhandled Exception 
    Sent when an unhandled exception is caught.
    """


    
class CEventNamespace(CEvent):
    """
    Namespace has changed. 
    This tells the debugger it should query the namespace again.
    """
    
    pass
    


class CEventNoThreads(CEvent):
    """
    No threads to debug.
    Debuggee notifies the debugger that it has no threads. This can
    happen in embedded debugging and in a python interpreter session.
    """
    
    pass


    
class CEventThreads(CEvent):
    """
    State of threads.
    """
    
    def __init__(self, _current_thread, thread_list):
        self.m_current_thread = _current_thread
        self.m_thread_list = thread_list



class CEventThreadBroken(CEvent):
    """
    A thread has broken.
    """
    
    def __init__(self, tid, name):
        self.m_tid = tid
        self.m_name = as_unicode(name)


        
class CEventStack(CEvent):
    """
    Stack of current thread.
    """
    
    def __init__(self, stack):
        self.m_stack = stack


    
class CEventStackFrameChange(CEvent):
    """
    Stack frame has changed.
    This event is sent when the debugger goes up or down the stack.
    """
    
    def __init__(self, frame_index):
        self.m_frame_index = frame_index


    
class CEventStackDepth(CEvent):
    """
    Stack depth has changed.
    """
    
    def __init__(self, stack_depth, stack_depth_exception):
        self.m_stack_depth = stack_depth
        self.m_stack_depth_exception = stack_depth_exception


    
class CEventBreakpoint(CEvent):
    """
    A breakpoint or breakpoints changed.
    """
    
    DISABLE = as_unicode('disable')
    ENABLE = as_unicode('enable')
    REMOVE = as_unicode('remove')
    SET = as_unicode('set')
    
    def __init__(self, bp, action = SET, id_list = [], fAll = False):
        self.m_bp = breakpoint_copy(bp)
        self.m_action = action
        self.m_id_list = id_list
        self.m_fAll = fAll



class CEventSync(CEvent):
    """
    Internal (not sent to the debugger) event that trigers the 
    firing of other events that help the debugger synchronize with 
    the state of the debuggee.
    """
    
    def __init__(self, fException, fSendUnhandled):
        self.m_fException = fException
        self.m_fSendUnhandled = fSendUnhandled
    

    
#
# --------------------------------- Event Manager --------------------------
#



class CEventDispatcherRecord:
    """
    Internal structure that binds a callback to particular events.
    """
    
    def __init__(self, callback, event_type_dict, fSingleUse):
        self.m_callback = callback
        self.m_event_type_dict = copy.copy(event_type_dict)
        self.m_fSingleUse = fSingleUse


    def is_match(self, event):
        rtl = [t for t in self.m_event_type_dict.keys() if isinstance(event, t)]
        if len(rtl) == 0:
            return False

        #
        # Examine first match only.
        #
        
        rt = rtl[0]    
        rte = self.m_event_type_dict[rt].get(EVENT_EXCLUDE, [])
        if len(rte) != 0:
            for e in rte:
                if event.is_match(e):
                    return False
            return True  
        
        rte = self.m_event_type_dict[rt].get(EVENT_INCLUDE, [])
        if len(rte) != 0:
            for e in rte:
                if event.is_match(e):
                    return True
            return False  

        return True

        
        
class CEventDispatcher:
    """
    Events dispatcher.
    Dispatchers can be chained together.
    """
    
    def __init__(self, chained_event_dispatcher = None):
        self.m_chained_event_dispatcher = chained_event_dispatcher
        self.m_chain_override_types = {}

        self.m_registrants = {}


    def shutdown(self):
        for er in list(self.m_registrants.keys()):
            self.__remove_dispatcher_record(er)

        
    def register_callback(self, callback, event_type_dict, fSingleUse):
        er = CEventDispatcherRecord(callback, event_type_dict, fSingleUse)

        #
        # If we have a chained dispatcher, register the callback on the 
        # chained dispatcher as well.
        #
        if self.m_chained_event_dispatcher is not None:
            _er = self.__register_callback_on_chain(er, event_type_dict, fSingleUse)
            self.m_registrants[er] = _er
            return er
            
        self.m_registrants[er] = True
        return er


    def remove_callback(self, callback):
        erl = [er for er in list(self.m_registrants.keys()) if er.m_callback == callback]
        for er in erl:
            self.__remove_dispatcher_record(er)


    def fire_events(self, event_list):
        for event in event_list:
            self.fire_event(event)


    def fire_event(self, event):
        for er in list(self.m_registrants.keys()):
            self.__fire_er(event, er)

                        
    def __fire_er(self, event, er):
        if not er.is_match(event):
            return
            
        try:
            er.m_callback(event)
        except:
            pass
            
        if not er.m_fSingleUse:
            return
            
        try:
            del self.m_registrants[er]
        except KeyError:
            pass

                    
    def register_chain_override(self, event_type_dict):
        """
        Chain override prevents registration on chained 
        dispatchers for specific event types.
        """
        
        for t in list(event_type_dict.keys()):
            self.m_chain_override_types[t] = True


    def __register_callback_on_chain(self, er, event_type_dict, fSingleUse):
        _event_type_dict = copy.copy(event_type_dict)
        for t in self.m_chain_override_types:
            if t in _event_type_dict:
                del _event_type_dict[t]

        if len(_event_type_dict) == 0:
            return False


        def callback(event, er = er):
            self.__fire_er(event, er)
            
        _er = self.m_chained_event_dispatcher.register_callback(callback, _event_type_dict, fSingleUse)
        return _er

        
    def __remove_dispatcher_record(self, er):
        try:
            if self.m_chained_event_dispatcher is not None:
                _er = self.m_registrants[er]
                if _er != False:
                    self.m_chained_event_dispatcher.__remove_dispatcher_record(_er)

            del self.m_registrants[er]
            
        except KeyError:
            pass
                


class CEventQueue:
    """
    Add queue semantics above an event dispatcher.
    Instead of firing event callbacks, new events are returned in a list
    upon request.
    """
    
    def __init__(self, event_dispatcher, max_event_list_length = MAX_EVENT_LIST_LENGTH):
        self.m_event_dispatcher = event_dispatcher

        self.m_event_lock = threading.Condition()
        self.m_max_event_list_length = max_event_list_length
        self.m_event_list = []
        self.m_event_index = 0

        self.m_n_waiters = []

 
    def shutdown(self):
        self.m_event_dispatcher.remove_callback(self.event_handler)

    
    def register_event_types(self, event_type_dict):
        self.m_event_dispatcher.register_callback(self.event_handler, event_type_dict, fSingleUse = False)


    def event_handler(self, event):
        try:
            self.m_event_lock.acquire()

            if isinstance(event, CEventSyncReceivers):
                t0 = time.time()
                while len(self.m_n_waiters) < event.m_sync_n and time.time() < t0 + HEARTBEAT_TIMEOUT:
                    time.sleep(0.1)

            self.m_event_list.append(event)
            if len(self.m_event_list) > self.m_max_event_list_length:
                self.m_event_list.pop(0)
                
            self.m_event_index += 1    
            lock_notify_all(self.m_event_lock)

        finally:
            self.m_event_lock.release()


    def get_event_index(self):
        return self.m_event_index


    def wait_for_event(self, timeout, event_index):
        """
        Return the new events which were fired. 
        """
        
        try:
            self.m_n_waiters.append(0)

            self.m_event_lock.acquire()
            if event_index >= self.m_event_index:
                safe_wait(self.m_event_lock, timeout)

            if event_index >= self.m_event_index:
                return (self.m_event_index, [])
                
            sub_event_list = self.m_event_list[event_index - self.m_event_index:]
            return (self.m_event_index, sub_event_list)
            
        finally:
            self.m_n_waiters.pop()

            self.m_event_lock.release()



class CStateManager:
    """
    Manage possible debugger states (broken, running, etc...)

    The state manager can receive state changes via an input event 
    dispatcher or via the set_state() method

    It sends state changes forward to the output event dispatcher.

    The state can also be queried or waited for.
    """
    
    def __init__(self, initial_state, event_dispatcher_output = None, event_dispatcher_input = None):
        self.m_event_dispatcher_input = event_dispatcher_input
        self.m_event_dispatcher_output = event_dispatcher_output

        if self.m_event_dispatcher_input is not None:
            event_type_dict = {CEventState: {}}
            self.m_event_dispatcher_input.register_callback(self.event_handler, event_type_dict, fSingleUse = False)

            if self.m_event_dispatcher_output is not None:
                self.m_event_dispatcher_output.register_chain_override(event_type_dict)

        self.m_state_lock = threading.Condition()

        self.m_state_queue = []
        self.m_state_index = 0        
        self.m_waiter_list = {}
        
        self.set_state(initial_state) 


    def shutdown(self):
        if self.m_event_dispatcher_input is not None:
            self.m_event_dispatcher_input.remove_callback(self.event_handler)


    def event_handler(self, event):
        self.set_state(event.m_state)


    def get_state(self):
        return self.m_state_queue[-1]


    def __add_state(self, state):
        self.m_state_queue.append(state)
        self.m_state_index += 1

        self.__remove_states()


    def __remove_states(self, treshold = None):
        """
        Clean up old state changes from the state queue.
        """
        
        index = self.__calc_min_index()

        if (treshold is not None) and (index <= treshold):
            return
            
        _delta = 1 + self.m_state_index - index

        self.m_state_queue = self.m_state_queue[-_delta:]

        
    def __calc_min_index(self):
        """
        Calc the minimum state index.
        The calculated index is the oldest state of which all state
        waiters are aware of. That is, no one cares for older states
        and these can be removed from the state queue.
        """
        
        if len(self.m_waiter_list) == 0:
            return self.m_state_index

        index_list = list(self.m_waiter_list.keys())
        min_index = min(index_list)

        return min_index

        
    def __add_waiter(self):
        index = self.m_state_index
        n = self.m_waiter_list.get(index, 0)
        self.m_waiter_list[index] = n + 1

        return index


    def __remove_waiter(self, index):
        n = self.m_waiter_list[index]
        if n == 1:
            del self.m_waiter_list[index]
            self.__remove_states(index)
        else:
            self.m_waiter_list[index] = n - 1


    def __get_states(self, index):
        _delta = 1 + self.m_state_index - index
        states = self.m_state_queue[-_delta:]
        return states

        
    def set_state(self, state = None, fLock = True):
        try:
            if fLock:
                self.m_state_lock.acquire()

            if state is None:
                state = self.get_state()
                
            self.__add_state(state)            

            lock_notify_all(self.m_state_lock)

        finally:    
            if fLock:
                self.m_state_lock.release()

        if self.m_event_dispatcher_output is not None:
            event = CEventState(state)
            self.m_event_dispatcher_output.fire_event(event)

        
    def wait_for_state(self, state_list):
        """
        Wait for any of the states in the state list.
        """
        
        try:
            self.m_state_lock.acquire()

            if self.get_state() in state_list:
                return self.get_state()
            
            while True:
                index = self.__add_waiter()
            
                alertable_wait(self.m_state_lock, PING_TIMEOUT)

                states = self.__get_states(index)
                self.__remove_waiter(index)

                for state in states:
                    if state in state_list:
                        return state
            
        finally:
            self.m_state_lock.release()


    def acquire(self):
        self.m_state_lock.acquire()


    def release(self):
        self.m_state_lock.release()



#
# -------------------------------------- Break Info manager ---------------------------------------
#



def myord(c):
    try:
        return ord(c)
    except:
        return c



def CalcValidLines(code):
    l = code.co_firstlineno
    vl = [l]

    bl = [myord(c) for c in code.co_lnotab[2::2]]
    sl = [myord(c) for c in code.co_lnotab[1::2]]

    for (bi, si) in zip(bl, sl):
        l += si

        if bi == 0:
            continue

        if l != vl[-1]:
            vl.append(l)

    if len(sl) > 0:
        l += sl[-1]

        if l != vl[-1]:
            vl.append(l)
    
    return vl
    


class CScopeBreakInfo:
    def __init__(self, fqn, valid_lines):
        self.m_fqn = fqn
        self.m_first_line = valid_lines[0]
        self.m_last_line = valid_lines[-1]
        self.m_valid_lines = valid_lines


    def CalcScopeLine(self, lineno):
        rvl = copy.copy(self.m_valid_lines)
        rvl.reverse()

        for l in rvl:
            if lineno >= l:
                break

        return l

        
    def __str__(self):
        return "('" + self.m_fqn + "', " + str(self.m_valid_lines) + ')'
        


class CFileBreakInfo:
    """
    Break info structure for a source file.
    """
    
    def __init__(self, filename):
        self.m_filename = filename
        self.m_first_line = 0
        self.m_last_line = 0
        self.m_scope_break_info = []


    def CalcBreakInfo(self):
        (source, encoding) = get_source(self.m_filename)
        _source = as_string(source + as_unicode('\n'), encoding)
        
        code = compile(_source, self.m_filename, "exec")
        
        self.m_scope_break_info = []
        self.m_first_line = code.co_firstlineno
        self.m_last_line = 0
        
        fqn = []
        t = [code]
        
        while len(t) > 0:
            c = t.pop(0)

            if type(c) == tuple:
                self.m_scope_break_info.append(CScopeBreakInfo(*c))
                fqn.pop()
                continue

            fqn = fqn + [c.co_name]  
            valid_lines = CalcValidLines(c)
            self.m_last_line = max(self.m_last_line, valid_lines[-1])
            _fqn = as_unicode('.'.join(fqn), encoding)
            si = (_fqn, valid_lines)  
            subcodeslist = self.__CalcSubCodesList(c)
            t = subcodeslist + [si] + t

            
    def __CalcSubCodesList(self, code):
        tc = type(code)
        t = [(c.co_firstlineno, c) for c in code.co_consts if type(c) == tc]
        t.sort()
        scl = [c[1] for c in t]
        return scl


    def FindScopeByLineno(self, lineno):
        lineno = max(min(lineno, self.m_last_line), self.m_first_line)

        smaller_element = None
        exact_element = None
        
        for sbi in self.m_scope_break_info:
            if lineno > sbi.m_last_line:
                if (smaller_element is None) or (sbi.m_last_line >= smaller_element.m_last_line):
                    smaller_element = sbi
                continue

            if (lineno >= sbi.m_first_line) and (lineno <= sbi.m_last_line):
                exact_element = sbi
                break

        assert(exact_element is not None)

        scope = exact_element
        l = exact_element.CalcScopeLine(lineno)
        
        if (smaller_element is not None) and (l <= smaller_element.m_last_line):
            scope = smaller_element
            l = smaller_element.CalcScopeLine(lineno)

        return (scope, l)


    def FindScopeByName(self, name, offset):
        if name.startswith(MODULE_SCOPE):
            alt_scope = MODULE_SCOPE2 + name[len(MODULE_SCOPE):]
        elif name.startswith(MODULE_SCOPE2):
            alt_scope = MODULE_SCOPE + name[len(MODULE_SCOPE2):]
        else: 
            return self.FindScopeByName(MODULE_SCOPE2 + SCOPE_SEP + name, offset)
            
        for sbi in self.m_scope_break_info:
            if sbi.m_fqn in [name, alt_scope]:
                l = sbi.CalcScopeLine(sbi.m_first_line + offset)
                return (sbi, l)

        print_debug('Invalid scope: %s' % repr(name))

        raise InvalidScopeName
    


class CBreakInfoManager:
    """
    Manage break info dictionary per filename.
    """
    
    def __init__(self):
        self.m_file_info_dic = {}


    def addFile(self, filename):
        mbi = CFileBreakInfo(filename)
        mbi.CalcBreakInfo()
        self.m_file_info_dic[filename] = mbi


    def getFile(self, filename):
        if not filename in self.m_file_info_dic:
            self.addFile(filename)

        return self.m_file_info_dic[filename]



#
# -------------------------------- Break Point Manager -----------------------------
#



def breakpoint_copy(bp):
    if bp is None:
        return None

    _bp = copy.copy(bp)
        
    #filename = g_found_unicode_files.get(bp.m_filename, bp.m_filename)

    _bp.m_filename = as_unicode(bp.m_filename, sys.getfilesystemencoding())   
    _bp.m_code = None

    return _bp



class CBreakPoint(object):    
    def __init__(self, filename, scope_fqn, scope_first_line, lineno, fEnabled, expr, encoding, fTemporary = False):
        """
        Breakpoint constructor.

        scope_fqn - scope fully qualified name. e.g: module.class.method
        """
        
        self.m_id = None
        self.m_fEnabled = fEnabled
        self.m_filename = filename
        self.m_scope_fqn = scope_fqn
        self.m_scope_name = scope_fqn.split(SCOPE_SEP)[-1]
        self.m_scope_first_line = scope_first_line
        self.m_scope_offset = lineno - scope_first_line
        self.m_lineno = lineno
        self.m_expr = expr
        self.m_encoding = encoding
        self.m_code = None
        self.m_fTemporary = fTemporary

        if (expr is not None) and (expr != ''):
            _expr = as_bytes(ENCODING_SOURCE % encoding + expr, encoding)
            print_debug('Breakpoint expression: %s' % repr(_expr))
            self.m_code = compile(_expr, '<string>', 'eval')

        
    def __reduce__(self):
        rv = (copy_reg.__newobj__, (type(self), ), vars(self), None, None)
        return rv


    def calc_enclosing_scope_name(self):
        if self.m_scope_offset != 0:
            return None
            
        if self.m_scope_fqn in [MODULE_SCOPE, MODULE_SCOPE2]:
            return None

        scope_name_list = self.m_scope_fqn.split(SCOPE_SEP)
        enclosing_scope_name = scope_name_list[-2]

        return enclosing_scope_name

            
    def enable(self):
        self.m_fEnabled = True

        
    def disable(self):
        self.m_fEnabled = False


    def isEnabled(self):
        return self.m_fEnabled

        
    def __str__(self):
        return "('" + self.m_filename + "', '" + self.m_scope_fqn + "', " + str(self.m_scope_first_line) + ', ' + str(self.m_scope_offset) + ', ' + str(self.m_lineno) + ')'
        


class CBreakPointsManagerProxy:
    """
    A proxy for the breakpoint manager.
    While the breakpoint manager resides on the debuggee (the server), 
    the proxy resides in the debugger (the client - session manager)
    """
    
    def __init__(self, session_manager):
        self.m_session_manager = session_manager

        self.m_break_points_by_file = {}
        self.m_break_points_by_id = {}

        self.m_lock = threading.Lock()

        #
        # The breakpoint proxy inserts itself between the two chained
        # event dispatchers in the session manager.
        #
        
        event_type_dict = {CEventBreakpoint: {}}

        self.m_session_manager.m_event_dispatcher_proxy.register_callback(self.update_bp, event_type_dict, fSingleUse = False)
        self.m_session_manager.m_event_dispatcher.register_chain_override(event_type_dict)


    def update_bp(self, event):
        """
        Handle breakpoint updates that arrive via the event dispatcher.
        """
        
        try:    
            self.m_lock.acquire()

            if event.m_fAll:
                id_list = list(self.m_break_points_by_id.keys())
            else:
                id_list = event.m_id_list
                
            if event.m_action == CEventBreakpoint.REMOVE:
                for id in id_list:
                    try:
                        bp = self.m_break_points_by_id.pop(id)
                        bpm = self.m_break_points_by_file[bp.m_filename]
                        del bpm[bp.m_lineno]
                        if len(bpm) == 0:
                            del self.m_break_points_by_file[bp.m_filename]
                    except KeyError:
                        pass
                return
                
            if event.m_action == CEventBreakpoint.DISABLE:
                for id in id_list:
                    try:
                        bp = self.m_break_points_by_id[id]
                        bp.disable()
                    except KeyError:
                        pass
                return

            if event.m_action == CEventBreakpoint.ENABLE:
                for id in id_list:
                    try:
                        bp = self.m_break_points_by_id[id]
                        bp.enable()
                    except KeyError:
                        pass
                return
                
            bpm = self.m_break_points_by_file.get(event.m_bp.m_filename, {})
            bpm[event.m_bp.m_lineno] = event.m_bp

            self.m_break_points_by_id[event.m_bp.m_id] = event.m_bp
            
        finally:
            self.m_lock.release()

            self.m_session_manager.m_event_dispatcher.fire_event(event)


    def sync(self):
        try:    
            self.m_lock.acquire()

            self.m_break_points_by_file = {}
            self.m_break_points_by_id = {}
            
        finally:
            self.m_lock.release()

        break_points_by_id = self.m_session_manager.getSession().getProxy().get_breakpoints()

        try:    
            self.m_lock.acquire()

            self.m_break_points_by_id.update(break_points_by_id)

            for bp in list(self.m_break_points_by_id.values()):
                bpm = self.m_break_points_by_file.get(bp.m_filename, {})
                bpm[bp.m_lineno] = bp
            
        finally:
            self.m_lock.release()


    def clear(self):
        try:    
            self.m_lock.acquire()

            self.m_break_points_by_file = {}
            self.m_break_points_by_id = {}
            
        finally:
            self.m_lock.release()


    def get_breakpoints(self):
        return self.m_break_points_by_id


    def get_breakpoint(self, filename, lineno):
        bpm = self.m_break_points_by_file[filename]
        bp = bpm[lineno]
        return bp    


        
class CBreakPointsManager:
    def __init__(self):
        self.m_break_info_manager = CBreakInfoManager()
        self.m_active_break_points_by_file = {}
        self.m_break_points_by_function = {}
        self.m_break_points_by_file = {}
        self.m_break_points_by_id = {}
        self.m_lock = threading.Lock()

        self.m_temp_bp = None
        self.m_fhard_tbp = False


    def get_active_break_points_by_file(self, filename):
        """
        Get active breakpoints for file.
        """
        
        _filename = winlower(filename)
        
        return self.m_active_break_points_by_file.setdefault(_filename, {})

        
    def __calc_active_break_points_by_file(self, filename):
        bpmpt = self.m_active_break_points_by_file.setdefault(filename, {})        
        bpmpt.clear()

        bpm = self.m_break_points_by_file.get(filename, {})
        for bp in list(bpm.values()):
            if bp.m_fEnabled:
                bpmpt[bp.m_lineno] = bp
                
        tbp = self.m_temp_bp
        if (tbp is not None) and (tbp.m_filename == filename):
            bpmpt[tbp.m_lineno] = tbp                      

        
    def __remove_from_function_list(self, bp):
        function_name = bp.m_scope_name

        try:
            bpf = self.m_break_points_by_function[function_name]
            del bpf[bp]
            if len(bpf) == 0:
                del self.m_break_points_by_function[function_name]
        except KeyError:
            pass

        #
        # In some cases a breakpoint belongs to two scopes at the
        # same time. For example a breakpoint on the declaration line
        # of a function.
        #
        
        _function_name = bp.calc_enclosing_scope_name()
        if _function_name is None:
            return
            
        try:
            _bpf = self.m_break_points_by_function[_function_name]
            del _bpf[bp]
            if len(_bpf) == 0:
                del self.m_break_points_by_function[_function_name]
        except KeyError:
            pass


    def __add_to_function_list(self, bp):
        function_name = bp.m_scope_name

        bpf = self.m_break_points_by_function.setdefault(function_name, {})
        bpf[bp] = True 

        #
        # In some cases a breakpoint belongs to two scopes at the
        # same time. For example a breakpoint on the declaration line
        # of a function.
        #
        
        _function_name = bp.calc_enclosing_scope_name()
        if _function_name is None:
            return
            
        _bpf = self.m_break_points_by_function.setdefault(_function_name, {})
        _bpf[bp] = True 

            
    def get_breakpoint(self, filename, lineno):
        """
        Get breakpoint by file and line number.
        """
        
        bpm = self.m_break_points_by_file[filename]
        bp = bpm[lineno]
        return bp    

        
    def del_temp_breakpoint(self, fLock = True, breakpoint = None):
        """
        Delete a temoporary breakpoint.
        A temporary breakpoint is used when the debugger is asked to
        run-to a particular line.
        Hard temporary breakpoints are deleted only when actually hit.
        """
        if self.m_temp_bp is None:
            return

        try:    
            if fLock:
                self.m_lock.acquire()

            if self.m_temp_bp is None:
                return

            if self.m_fhard_tbp and not breakpoint is self.m_temp_bp:
                return

            bp = self.m_temp_bp
            self.m_temp_bp = None
            self.m_fhard_tbp = False

            self.__remove_from_function_list(bp)
            self.__calc_active_break_points_by_file(bp.m_filename)

        finally:
            if fLock:
                self.m_lock.release()

        
    def set_temp_breakpoint(self, filename, scope, lineno, fhard = False):
        """
        Set a temoporary breakpoint.
        A temporary breakpoint is used when the debugger is asked to
        run-to a particular line.
        Hard temporary breakpoints are deleted only when actually hit.
        """
        
        _filename = winlower(filename)

        mbi = self.m_break_info_manager.getFile(_filename)

        if scope != '':
            (s, l) = mbi.FindScopeByName(scope, lineno)
        else:
            (s, l) = mbi.FindScopeByLineno(lineno)

        bp = CBreakPoint(_filename, s.m_fqn, s.m_first_line, l, fEnabled = True, expr = as_unicode(''), encoding = as_unicode('utf-8'), fTemporary = True)

        try:    
            self.m_lock.acquire()

            self.m_fhard_tbp = False
            self.del_temp_breakpoint(fLock = False) 
            self.m_fhard_tbp = fhard
            self.m_temp_bp = bp
            
            self.__add_to_function_list(bp)
            self.__calc_active_break_points_by_file(bp.m_filename)

        finally:
            self.m_lock.release()


    def set_breakpoint(self, filename, scope, lineno, fEnabled, expr, encoding):
        """
        Set breakpoint.

        scope - a string (possibly empty) with the dotted scope of the 
                breakpoint. eg. 'my_module.my_class.foo'

        expr - a string (possibly empty) with a python expression 
               that will be evaluated at the scope of the breakpoint. 
               The breakpoint will be hit if the expression evaluates
               to True.
        """
        
        _filename = winlower(filename)
        
        mbi = self.m_break_info_manager.getFile(_filename)

        if scope != '':
            (s, l) = mbi.FindScopeByName(scope, lineno)
        else:
            (s, l) = mbi.FindScopeByLineno(lineno)

        bp = CBreakPoint(_filename, s.m_fqn, s.m_first_line, l, fEnabled, expr, encoding)

        try:    
            self.m_lock.acquire()

            bpm = self.m_break_points_by_file.setdefault(_filename, {})

            #
            # If a breakpoint on the same line is found we use its ID.
            # Since the debugger lists breakpoints by IDs, this has
            # a similar effect to modifying the breakpoint.
            #
            
            try:
                old_bp = bpm[l]
                id = old_bp.m_id
                self.__remove_from_function_list(old_bp)
            except KeyError:
                #
                # Find the smallest available ID.
                #
                
                bpids = list(self.m_break_points_by_id.keys())
                bpids.sort()
                
                id = 0
                while id < len(bpids):
                    if bpids[id] != id:
                        break
                    id += 1

            bp.m_id = id 
            
            self.m_break_points_by_id[id] = bp    
            bpm[l] = bp    
            if fEnabled:
                self.__add_to_function_list(bp)

            self.__calc_active_break_points_by_file(bp.m_filename)

            return bp    

        finally:
            self.m_lock.release()


    def disable_breakpoint(self, id_list, fAll):
        """
        Disable breakpoint.
        """
        
        try:    
            self.m_lock.acquire()

            if fAll:
                id_list = list(self.m_break_points_by_id.keys())

            for id in id_list:    
                try:
                    bp = self.m_break_points_by_id[id]
                except KeyError:
                    continue
                    
                bp.disable()
                self.__remove_from_function_list(bp)
                self.__calc_active_break_points_by_file(bp.m_filename)

        finally:
            self.m_lock.release()


    def enable_breakpoint(self, id_list, fAll):
        """
        Enable breakpoint.
        """
        
        try:    
            self.m_lock.acquire()

            if fAll:
                id_list = list(self.m_break_points_by_id.keys())

            for id in id_list:  
                try:
                    bp = self.m_break_points_by_id[id]
                except KeyError:
                    continue
                    
                bp.enable()
                self.__add_to_function_list(bp)
                self.__calc_active_break_points_by_file(bp.m_filename)

        finally:
            self.m_lock.release()


    def delete_breakpoint(self, id_list, fAll):
        """
        Delete breakpoint.
        """
        
        try:    
            self.m_lock.acquire()

            if fAll:
                id_list = list(self.m_break_points_by_id.keys())

            for id in id_list:    
                try:
                    bp = self.m_break_points_by_id[id]
                except KeyError:
                    continue
                    
                filename = bp.m_filename
                lineno = bp.m_lineno

                bpm = self.m_break_points_by_file[filename]
                if bp == bpm[lineno]:
                    del bpm[lineno]

                if len(bpm) == 0:
                    del self.m_break_points_by_file[filename]
                    
                self.__remove_from_function_list(bp)
                self.__calc_active_break_points_by_file(bp.m_filename)
                    
                del self.m_break_points_by_id[id]

        finally:
            self.m_lock.release()


    def get_breakpoints(self):
        return self.m_break_points_by_id



#
# ----------------------------------- Core Debugger ------------------------------------
#



class CCodeContext:
    """
    Class represents info related to code objects.
    """
    
    def __init__(self, frame, bp_manager):
        self.m_code = frame.f_code
        self.m_filename = calc_frame_path(frame)
        self.m_basename = os.path.basename(self.m_filename)

        self.m_file_breakpoints = bp_manager.get_active_break_points_by_file(self.m_filename)

        self.m_fExceptionTrap = False


    def is_untraced(self):
        """
        Return True if this code object should not be traced.
        """
        
        return self.m_basename in [THREADING_FILENAME, DEBUGGER_FILENAME]


    def is_exception_trap_frame(self):
        """
        Return True if this frame should be a trap for unhandled
        exceptions.
        """
        
        if self.m_basename == THREADING_FILENAME:
            return True

        if self.m_basename == DEBUGGER_FILENAME and self.m_code.co_name in ['__execv', '__execve', '__function_wrapper']:
            return True

        return False



class CDebuggerCoreThread:
    """
    Class represents a debugged thread.
    This is a core structure of the debugger. It includes most of the
    optimization tricks and hacks, and includes a good amount of 
    subtle bug fixes, be carefull not to mess it up...
    """
    
    def __init__(self, name, core_debugger, frame, event):
        self.m_thread_id = thread.get_ident()
        self.m_thread_name = name
        self.m_fBroken = False
        self.m_fUnhandledException = False
        
        self.m_frame = frame
        self.m_event = event
        self.m_ue_lineno = None
        self.m_uef_lineno = None
        
        self.m_code_context = core_debugger.get_code_context(frame)

        self.m_locals_copy = {}

        self.m_core = core_debugger
        self.m_bp_manager = core_debugger.m_bp_manager

        self.m_frame_lock = threading.Condition()
        self.m_frame_external_references = 0

        self.m_exc_info = None

        self.m_depth = 0
        self.set_depth(frame) 
       

    def set_depth(self, frame):
        self.m_depth = 0
        while frame is not None:
            self.m_depth += 1
            frame = frame.f_back
        

    def profile_recursion(self, frame, event, arg):
        if event == 'call':
            if self.m_depth > g_recursionlimit:
                print_debug('Exceeded recursion limit and caught in profile function.')

                try:
                    #
                    # The allowed recursion limit was exceeded. 
                    # To view the offending script frame, go two frames 
                    # down the stack with the 'down' console command.
                    #
                    raise RuntimeError('maximum recursion depth exceeded')

                except:
                    #
                    # Schedule the debugger to re-enable the profile hook.
                    #
                    self.set_tracers(fsignal_exception = True)
                    raise

        elif event == 'return':
            return self.profile(frame, event, arg)


 
    def profile(self, frame, event, arg): 
        """
        Profiler method.
        The Python profiling mechanism is used by the debugger
        mainly to handle synchronization issues related to the 
        life time of the frame structure.
        """
        #print_debug('profile: %s, %s, %s, %s, %s' % (repr(frame), event, frame.f_code.co_name, frame.f_code.co_filename, repr(arg)[:40])) 

        if event == 'return':
            self.m_depth -= 1

            if sys.excepthook != g_excepthook:
                set_excepthook()

            self.m_frame = frame.f_back

            try:
                self.m_code_context = self.m_core.m_code_contexts[self.m_frame.f_code]
            except AttributeError:
                if self.m_event != 'return' and self.m_core.m_ftrap:
                    #
                    # An exception is raised from the outer-most frame.
                    # This means an unhandled exception.
                    #
                
                    self.m_frame = frame
                    self.m_event = 'exception'
                    
                    self.m_uef_lineno = self.m_ue_lineno
                    
                    self.m_fUnhandledException = True 
                    self.m_core._break(self, frame, event, arg)
                    
                    self.m_uef_lineno = None 
                    
                    if frame in self.m_locals_copy:
                        self.update_locals()

                    self.m_frame = None
                
                self.m_core.remove_thread(self.m_thread_id)
                sys.setprofile(None)
                sys.settrace(self.m_core.trace_dispatch_init)
            
            if self.m_frame_external_references == 0:
                return

            #
            # Wait until no one references the frame object
            #
            
            try:
                self.m_frame_lock.acquire() 

                while self.m_frame_external_references != 0:
                    safe_wait(self.m_frame_lock, 1.0)

            finally:
                self.m_frame_lock.release()

                            
    def frame_acquire(self):
        """
        Aquire a reference to the frame.
        """
        
        try:
            self.m_frame_lock.acquire()
            
            self.m_frame_external_references += 1
            f = self.m_frame
            if f is None:
                raise ThreadDone

            return f    

        finally:    
            self.m_frame_lock.release()


    def frame_release(self):
        """
        Release a reference to the frame.
        """
        
        try:
            self.m_frame_lock.acquire()
                
            self.m_frame_external_references -= 1
            if self.m_frame_external_references == 0:
                self.m_frame_lock.notify()

        finally:    
            self.m_frame_lock.release()

        
    def get_frame(self, base_frame, index, fException = False):
        """
        Get frame at index depth down the stack.
        Starting from base_frame return the index depth frame 
        down the stack. If fException is True use the exception
        stack (traceback).
        """
        
        if fException:
            tb = get_traceback(base_frame, self)
            if tb is None:
                raise NoExceptionFound
                
            while tb.tb_next is not None:
                tb = tb.tb_next

            f = tb.tb_frame
        else:    
            f = base_frame
            
        while f is not None:
            if not g_fDebug and f.f_code.co_name == 'rpdb2_import_wrapper':
                f = f.f_back
                continue

            if index <= 0:
                break

            f = f.f_back
            index -= 1

        if (index < 0) or (f is None):
            raise InvalidFrame

        if (self.m_uef_lineno is not None) and (f.f_back is None):
            lineno = self.m_uef_lineno
        else:    
            lineno = f.f_lineno
            
        if fException:
            tb = get_traceback(base_frame, self)
            while tb is not None:
                if tb.tb_frame == f:
                    lineno = tb.tb_lineno
                    break
                tb = tb.tb_next

        return (f, lineno)  


    def get_locals_copy(self, frame_index, fException, fReadOnly):
        """
        Get globals and locals of frame.
        A copy scheme is used for locals to work around a bug in 
        Python 2.3 and 2.4 that prevents modifying the local dictionary.
        """
       
        try:
            base_frame = self.frame_acquire()

            (f, lineno) = self.get_frame(base_frame, frame_index, fException)

            if fReadOnly:
                gc = copy.copy(f.f_globals)
            else:    
                gc = f.f_globals

            try:
                (lc, olc) = self.m_locals_copy[f]

            except KeyError:
                if f.f_code.co_name in [MODULE_SCOPE, MODULE_SCOPE2]:
                    lc = gc
                    olc = gc
                    
                else:    
                    lc = copy.copy(f.f_locals)
                    olc = copy.copy(lc)
                    
                    if not fReadOnly:
                        self.m_locals_copy[f] = (lc, olc)
                        self.set_local_trace(f)

            return (gc, lc, olc)

        finally:
            f = None
            base_frame = None
            
            self.frame_release()


    def update_locals_copy(self):
        """
        Update copy of locals with changes in locals.
        """
        
        lct = self.m_locals_copy.get(self.m_frame, None)
        if lct is None:
            return

        (lc, base) = lct
        cr = copy.copy(self.m_frame.f_locals)

        for k in cr:
            if not k in base:
                lc[k] = cr[k]
                continue

            if not cr[k] is base[k]:
                lc[k] = cr[k]
 
            
    def update_locals(self):
        """
        Update locals with changes from copy of locals.
        """
        
        lct = self.m_locals_copy.pop(self.m_frame, None)
        if lct is None:
            return

        self.m_frame.f_locals.update(lct[0])

            
    def __eval_breakpoint(self, frame, bp):
        """
        Return True if the breakpoint is hit.
        """
        
        if not bp.m_fEnabled:
            return False

        if bp.m_expr == '':
            return True

        try:
            if frame in self.m_locals_copy:
                l = self.m_locals_copy[frame][0]
                v = eval(bp.m_code, frame.f_globals, l)
            else:
                v = eval(bp.m_code, frame.f_globals, frame.f_locals)
                
            return (v != False)
            
        except:
            return False


    def set_local_trace(self, frame, fsignal_exception = False):
        """
        Set trace callback of frame. 
        Specialized trace methods are selected here to save switching time 
        during actual tracing.
        """
        
        if not self.m_core.m_ftrace:
            frame.f_trace = self.trace_dispatch_stop
            return

        if fsignal_exception:
            frame.f_trace = self.trace_dispatch_signal
            return

        code_context = self.m_core.get_code_context(frame)

        if self.m_core.is_break(self, frame):
            frame.f_trace = self.trace_dispatch_break
            
        elif code_context.m_fExceptionTrap or (frame.f_back is None):    
            frame.f_trace = self.trace_dispatch_trap
            
        elif frame.f_code.co_name in self.m_bp_manager.m_break_points_by_function:
            frame.f_trace = self.trace_dispatch
            
        elif frame in self.m_locals_copy:
            frame.f_trace = self.trace_dispatch
            
        elif frame == self.m_core.m_return_frame:
            frame.f_trace = self.trace_dispatch
            
        else:    
            del frame.f_trace


    def set_tracers(self, fsignal_exception = False): 
        """
        Set trace callbacks for all frames in stack.
        """
        
        try:
            try:
                f = self.frame_acquire()
                while f is not None:
                    self.set_local_trace(f, fsignal_exception)
                    f = f.f_back
                    
            except ThreadDone:
                f = None
                
        finally:      
            f = None
            self.frame_release()


    def trace_dispatch_stop(self, frame, event, arg):
        """
        Disable tracing for this thread.
        """
        
        if frame in self.m_locals_copy:
            self.update_locals()

        sys.settrace(None)
        sys.setprofile(None)
        return None


    def trace_dispatch_break(self, frame, event, arg):
        """
        Trace method for breaking a thread.
        """
        
        if event not in ['line', 'return', 'exception']:
            return frame.f_trace

        if event == 'exception':
            self.set_exc_info(arg)

        self.m_event = event

        if frame in self.m_locals_copy:
            self.update_locals_copy()

        self.m_core._break(self, frame, event, arg)

        if frame in self.m_locals_copy:
            self.update_locals()
            self.set_local_trace(frame)
        
        return frame.f_trace            


    def trace_dispatch_call(self, frame, event, arg):
        """
        Initial trace method for thread.
        """
        
        if not self.m_core.m_ftrace:
            return self.trace_dispatch_stop(frame, event, arg)
       
        self.m_depth += 1
        if self.m_depth > g_recursionlimit:
            sys.setprofile(self.profile_recursion)
        
        self.m_frame = frame

        try:
            self.m_code_context = self.m_core.m_code_contexts[frame.f_code]
        except KeyError:
            self.m_code_context = self.m_core.get_code_context(frame)

        if self.m_core.m_fBreak or (self.m_core.m_step_tid == self.m_thread_id):
            self.m_event = event
            self.m_core._break(self, frame, event, arg)
            if frame in self.m_locals_copy:
                self.update_locals()
                self.set_local_trace(frame)
            return frame.f_trace

        if not frame.f_code.co_name in self.m_bp_manager.m_break_points_by_function:
            return None

        bp = self.m_code_context.m_file_breakpoints.get(frame.f_lineno, None)
        if bp is not None and self.__eval_breakpoint(frame, bp): 
            self.m_event = event
            self.m_core._break(self, frame, event, arg)
            if frame in self.m_locals_copy:
                self.update_locals()
                self.set_local_trace(frame)
            return frame.f_trace     
    
        return self.trace_dispatch     

        
    def trace_dispatch(self, frame, event, arg):
        """
        General trace method for thread.
        """
        
        if (event == 'line'):
            if frame in self.m_locals_copy:
                self.update_locals_copy()

            bp = self.m_code_context.m_file_breakpoints.get(frame.f_lineno, None)                

            if bp is not None and self.__eval_breakpoint(frame, bp): 
                self.m_event = event
                self.m_core._break(self, frame, event, arg)
                
            if frame in self.m_locals_copy:
                self.update_locals()
                self.set_local_trace(frame)

            return frame.f_trace     
                        
        if event == 'return':
            if frame in self.m_locals_copy:
                self.update_locals_copy()

            if frame == self.m_core.m_return_frame:
                self.m_event = event
                self.m_core._break(self, frame, event, arg)
                
            if frame in self.m_locals_copy:
                self.update_locals()

            return None     
            
        if event == 'exception':
            if frame in self.m_locals_copy:
                self.update_locals()
                self.set_local_trace(frame)

            if not is_py3k() and not frame.f_exc_traceback is arg[2]:
                (frame.f_exc_type, frame.f_exc_value, frame.f_exc_traceback) = arg

            return frame.f_trace     

        return frame.f_trace     


    def trace_dispatch_trap(self, frame, event, arg):
        """
        Trace method used for frames in which unhandled exceptions
        should be caught.
        """
        
        if (event == 'line'):
            self.m_event = event

            if frame in self.m_locals_copy:
                self.update_locals_copy()

            bp = self.m_code_context.m_file_breakpoints.get(frame.f_lineno, None)                
            if bp is not None and self.__eval_breakpoint(frame, bp): 
                self.m_core._break(self, frame, event, arg)
                
            if frame in self.m_locals_copy:
                self.update_locals()
                self.set_local_trace(frame)

            return frame.f_trace     
                        
        if event == 'return':
            last_event = self.m_event
            self.m_event = event

            if frame in self.m_locals_copy:
                self.update_locals_copy()

            if frame == self.m_core.m_return_frame:
                self.m_core._break(self, frame, event, arg)
                
            if frame in self.m_locals_copy:
                self.update_locals()

            if last_event == 'exception':
                self.m_event = last_event
                
            return None     
            
        if event == 'exception':
            self.m_event = event

            if self.m_code_context.m_fExceptionTrap and self.m_core.m_ftrap:                
                self.set_exc_info(arg)
                
                self.m_fUnhandledException = True
                self.m_core._break(self, frame, event, arg)

                if frame in self.m_locals_copy:
                    self.update_locals()
                    
                return frame.f_trace

            self.m_ue_lineno = frame.f_lineno
            
            if frame in self.m_locals_copy:
                self.update_locals()
                self.set_local_trace(frame)

            if is_py3k():
                self.set_exc_info(arg)
            elif not frame.f_exc_traceback is arg[2]:
                (frame.f_exc_type, frame.f_exc_value, frame.f_exc_traceback) = arg

            return frame.f_trace     

        return frame.f_trace     


    def trace_dispatch_signal(self, frame, event, arg):
        #print_debug('*** trace_dispatch_signal %s, %s, %s' % (frame.f_lineno, event, repr(arg)))
        self.set_exc_info(arg)
        self.set_tracers()
        self.set_depth(frame)
        sys.setprofile(self.profile)

        return self.trace_dispatch_trap(frame, event, arg)

        
    def set_exc_info(self, arg):
        """
        Set exception information.
        """

        if arg == None:
            return

        if is_py3k():
            self.m_exc_info = arg
            return

        (t, v, tb) = arg

        while tb is not None:
            f = tb.tb_frame            
            f.f_exc_type = t
            f.f_exc_value = v 
            f.f_exc_traceback = tb

            tb = tb.tb_next


    def get_exc_info(self):
        return self.m_exc_info


    def reset_exc_info(self):
        self.m_exc_info = None


    def is_breakpoint(self):
        """
        Calc if current line is hit by breakpoint.
        """
        
        bp = self.m_code_context.m_file_breakpoints.get(self.m_frame.f_lineno, None)
        if bp is not None and self.__eval_breakpoint(self.m_frame, bp):
            return True

        return False    


    def get_breakpoint(self):
        """
        Return current line breakpoint if any.
        """
        
        return self.m_code_context.m_file_breakpoints.get(self.m_frame.f_lineno, None)



class CDebuggerCore:
    """
    Base class for the debugger. 
    Handles basic debugger functionality.
    """
    
    def __init__(self, fembedded = False):
        self.m_ftrace = True

        self.m_current_ctx = None 
        self.m_f_first_to_break = True
        self.m_f_break_on_init = False
        
        self.m_builtins_hack = None

        self.m_timer_embedded_giveup = None
        
        self.m_threads_lock = threading.Condition()

        self.m_threads = {}

        self.m_event_dispatcher = CEventDispatcher()
        self.m_state_manager = CStateManager(STATE_RUNNING, self.m_event_dispatcher)

        self.m_ffork_into_child = False
        self.m_ffork_auto = False

        self.m_fsynchronicity = True
        self.m_ftrap = True
        self.m_fUnhandledException = False        
        self.m_fBreak = False

        self.m_lastest_event = None
        self.m_step_tid = None
        self.m_next_frame = None
        self.m_return_frame = None       
        self.m_saved_step = (None, None, None)
        self.m_saved_next = None

        self.m_bp_manager = CBreakPointsManager()

        self.m_code_contexts = {None: None}

        self.m_fembedded = fembedded
        self.m_embedded_event = threading.Event()
        self.m_embedded_sync_t0 = 0
        self.m_embedded_sync_t1 = 0

        self.m_heartbeats = {0: time.time() + 3600}
        

    def shutdown(self):
        self.m_event_dispatcher.shutdown()
        self.m_state_manager.shutdown()

        
    def is_embedded(self):
        return self.m_fembedded

        
    def send_fork_switch(self, sync_n):
        """
        Notify client that debuggee is forking and that it should
        try to reconnect to the child.
        """
        
        print_debug('Sending fork switch event')

        event = CEventForkSwitch(sync_n)
        self.m_event_dispatcher.fire_event(event)


    def send_exec_switch(self, sync_n):
        """
        Notify client that debuggee is doing an exec and that it should 
        try to reconnect (in case the exec failed).
        """
        
        print_debug('Sending exec switch event')

        event = CEventExecSwitch(sync_n)
        self.m_event_dispatcher.fire_event(event)


    def send_event_exit(self):
        """
        Notify client that the debuggee is shutting down.
        """
        
        event = CEventExit()
        self.m_event_dispatcher.fire_event(event)


    def send_events(self, event):
        pass

        
    def set_request_go_timer(self, timeout):
        """
        Set timeout thread to release debugger from waiting for a client
        to attach.
        """
        
        self.cancel_request_go_timer()

        if timeout is None:
            return
        
        _timeout = max(1.0, timeout)

        f = lambda: ( 
            self.record_client_heartbeat(0, False, True),
            self.request_go()
            )
 
        self.m_timer_embedded_giveup = threading.Timer(_timeout, f)
        self.m_timer_embedded_giveup.start()
        
        #
        # sleep() releases control and allow timer thread to actually start 
        # before this scope returns.
        #
        time.sleep(0.1)

    
    def cancel_request_go_timer(self):
        t = self.m_timer_embedded_giveup
        if t is not None:
            self.m_timer_embedded_giveup = None
            t.cancel()


    def setbreak(self, f):
        """
        Set thread to break on next statement.
        """
        
        if not self.m_ftrace:
            return 
            
        tid = thread.get_ident()

        if not tid in self.m_threads:
            return self.settrace(f)
        
        ctx = self.m_threads[tid]
        f.f_trace = ctx.trace_dispatch_break
        self.m_saved_next = self.m_next_frame
        self.m_next_frame = f

        
    def settrace(self, f = None, f_break_on_init = True, timeout = None, builtins_hack = None):
        """
        Start tracing mechanism for thread.
        """
        
        if not self.m_ftrace:
            return 
            
        tid = thread.get_ident()
        if tid in self.m_threads:
            return

        self.set_request_go_timer(timeout)
            
        self.m_f_break_on_init = f_break_on_init
        self.m_builtins_hack = builtins_hack
        
        threading.settrace(self.trace_dispatch_init)
        sys.settrace(self.trace_dispatch_init)

        if f is not None:
            f.f_trace = self.trace_dispatch_init


    def stoptrace(self):
        """
        Stop tracing mechanism.
        """
        
        global g_fignore_atexit
        
        g_fignore_atexit = True

        threading.settrace(None)
        sys.settrace(None)
        sys.setprofile(None)
        
        self.m_ftrace = False
        self.set_all_tracers()

        try:
            self.request_go()
        except DebuggerNotBroken:
            pass
            
        #self.m_threads = {}


    def get_code_context(self, frame):
        try:
            return self.m_code_contexts[frame.f_code]
        except KeyError:
            if self.m_builtins_hack != None:
                if calc_frame_path(frame) == self.m_builtins_hack:
                    self.m_builtins_hack = None
                    frame.f_globals['__builtins__'] = g_builtins_module

            code_context = CCodeContext(frame, self.m_bp_manager)
            return self.m_code_contexts.setdefault(frame.f_code, code_context)


    def get_current_ctx(self):
        if len(self.m_threads) == 0:
            raise NoThreads

        return self.m_current_ctx 

        
    def get_ctx(self, tid):
        ctx = self.m_threads.get(tid, None)
        if ctx == None:
            raise ThreadNotFound 

        return ctx 


    def wait_for_first_thread(self):
        """
        Wait until at least one debuggee thread is alive.
        Python can have 0 threads in some circumstances as
        embedded Python and the Python interpreter console.
        """
        
        if self.m_current_ctx is not None:
            return

        try:
            self.m_threads_lock.acquire() 

            while self.m_current_ctx is None:
                safe_wait(self.m_threads_lock, 1.0)

        finally:
            self.m_threads_lock.release()


    def notify_first_thread(self):
        """
        Notify that first thread is available for tracing.
        """
        
        try:
            self.m_threads_lock.acquire()
            self.m_threads_lock.notify()
        finally:
            self.m_threads_lock.release()


    def set_exception_trap_frame(self, frame):
        """
        Set trap for unhandled exceptions in relevant frame.
        """
        
        while frame is not None:
            code_context = self.get_code_context(frame)
            if code_context.is_exception_trap_frame():                
                code_context.m_fExceptionTrap = True
                return

            frame = frame.f_back


    def __set_signal_handler(self):
        """
        Set rpdb2 to wrap all signal handlers.
        """
        for key, value in list(vars(signal).items()):
            if not key.startswith('SIG') or key in ['SIG_IGN', 'SIG_DFL', 'SIGRTMIN', 'SIGRTMAX']:
                continue

            handler = signal.getsignal(value)
            if handler in [signal.SIG_IGN, signal.SIG_DFL]:
                continue

            try:
                signal.signal(value, handler)
            except:
                print_debug('Failed to set signal handler for signal %s(%d)' % (key, value))


    def clear_source_cache(self):
        g_lines_cache.clear()
        
        event = CEventClearSourceCache()
        self.m_event_dispatcher.fire_event(event)


    def trace_dispatch_init(self, frame, event, arg):   
        """
        Initial tracing method.
        """
        
        if event not in ['call', 'line', 'return']:
            return None

        code_context = self.get_code_context(frame)
        if event == 'call' and code_context.is_untraced():
            return None

        self.set_exception_trap_frame(frame)

        try:
            t = current_thread()
            name = thread_get_name(t)
        except:
            name = ''
       
        if name == 'MainThread':
            self.__set_signal_handler()

        ctx = CDebuggerCoreThread(name, self, frame, event)
        ctx.set_tracers()

        try:
            self.m_threads_lock.acquire() 

            self.m_threads[ctx.m_thread_id] = ctx
            nthreads = len(self.m_threads)

            if nthreads == 1:
                self.prepare_embedded_sync()

        finally:
            self.m_threads_lock.release()

        if nthreads == 1:
            self.clear_source_cache()
            
            self.m_current_ctx = ctx
            self.notify_first_thread()

            if self.m_f_break_on_init:
                self.m_f_break_on_init = False
                self.request_break()

        sys.settrace(ctx.trace_dispatch_call)
        sys.setprofile(ctx.profile)
      
        self.wait_embedded_sync(nthreads == 1)

        if event == 'call':
            return ctx.trace_dispatch_call(frame, event, arg)
        elif hasattr(frame, 'f_trace') and (frame.f_trace is not None):    
            return frame.f_trace(frame, event, arg)
        else:
            return None

    
    def prepare_embedded_sync(self):
        if not self.m_fembedded:
            return

        t = time.time()
        t0 = self.m_embedded_sync_t0

        if t0 != 0:
            self.fix_heartbeats(t - t0)

        if self.get_clients_attached() == 0:
            return

        if t - t0 < EMBEDDED_SYNC_THRESHOLD:
            return

        self.m_embedded_sync_t1 = t
        self.m_embedded_event.clear()


    def wait_embedded_sync(self, ftrigger):
        if not self.m_fembedded:
            return

        t = time.time()
        t0 = self.m_embedded_sync_t0
        t1 = self.m_embedded_sync_t1

        if t - t0 < EMBEDDED_SYNC_THRESHOLD:
            return

        if t - t1 >= EMBEDDED_SYNC_TIMEOUT:
            return

        if ftrigger:
            event = CEventEmbeddedSync()
            self.m_event_dispatcher.fire_event(event)

        safe_wait(self.m_embedded_event, EMBEDDED_SYNC_TIMEOUT - (t - t1))

        if ftrigger:
            self.m_embedded_sync_t1 = 0


    def embedded_sync(self):
        self.m_embedded_event.set()


    def set_all_tracers(self):
        """
        Set trace methods for all frames of all threads.
        """
        
        for ctx in list(self.m_threads.values()):
            ctx.set_tracers()

            
    def remove_thread(self, thread_id):
        try:
            del self.m_threads[thread_id]
            
            if self.m_current_ctx.m_thread_id == thread_id:
                self.m_current_ctx = list(self.m_threads.values())[0]
                
        except (KeyError, IndexError):
            self.m_embedded_sync_t0 = time.time()           


    def set_break_flag(self):
        self.m_fBreak = (self.m_state_manager.get_state() == STATE_BROKEN)

        
    def is_break(self, ctx, frame, event = None):
        if self.m_fBreak:
            return True

        if ctx.m_fUnhandledException:
            return True
            
        if self.m_step_tid == ctx.m_thread_id:
            return True

        if self.m_next_frame == frame:
            return True

        if (self.m_return_frame == frame) and (event == 'return'):
            return True

        return False    

    
    def record_client_heartbeat(self, id, finit, fdetach):
        """
        Record that client id is still attached.
        """
       
        if finit:
            self.m_heartbeats.pop(0, None)

        if fdetach:
            self.m_heartbeats.pop(id, None)
            return

        if finit or id in self.m_heartbeats:
            self.m_heartbeats[id] = time.time()


    def fix_heartbeats(self, missing_pulse):
        for k, v in list(self.m_heartbeats.items()):
            self.m_heartbeats[k] = v + missing_pulse


    def get_clients_attached(self):
        n = 0
        t = time.time()
        
        for v in list(self.m_heartbeats.values()):
            if t < v + HEARTBEAT_TIMEOUT:
                n += 1

        return n


    def is_waiting_for_attach(self):
        if self.get_clients_attached() != 1:
            return False

        if list(self.m_heartbeats.keys()) != [0]:
            return False

        return True


    def _break(self, ctx, frame, event, arg):
        """
        Main break logic.
        """

        global g_fos_exit
        global g_module_main
        
        if not self.is_break(ctx, frame, event) and not ctx.is_breakpoint():
            ctx.set_tracers()
            return 
            
        ctx.m_fBroken = True
        f_full_notification = False
        f_uhe_notification = False
      
        step_tid = self.m_step_tid

        try: 
            self.m_state_manager.acquire()
            if self.m_state_manager.get_state() != STATE_BROKEN:
                self.set_break_dont_lock()

            if g_module_main == -1:
                try:
                    g_module_main = sys.modules['__main__']
                except:
                    g_module_main = None

            if not is_py3k() and not frame.f_exc_traceback is None:
                ctx.set_exc_info((frame.f_exc_type, frame.f_exc_value, frame.f_exc_traceback))

            if is_py3k() and ctx.get_exc_info() == None and sys.exc_info()[2] != None:
                ctx.set_exc_info(sys.exc_info())

            try:
                t = current_thread()
                ctx.m_thread_name = thread_get_name(t)
            except:
                pass
            
            if ctx.m_fUnhandledException and not self.m_fUnhandledException:
                self.m_fUnhandledException = True
                f_uhe_notification = True
            
            if self.is_auto_fork_first_stage(ctx.m_thread_id):
                self.m_saved_step = (self.m_step_tid, self.m_saved_next, self.m_return_frame)
                self.m_saved_next = None
                self.m_bp_manager.m_fhard_tbp = True

            if self.m_f_first_to_break or (self.m_current_ctx == ctx):                
                self.m_current_ctx = ctx
                self.m_lastest_event = event

                self.m_step_tid = None
                self.m_next_frame = None
                self.m_return_frame = None       
                self.m_saved_next = None

                self.m_bp_manager.del_temp_breakpoint(breakpoint = ctx.get_breakpoint())

                self.m_f_first_to_break = False
                f_full_notification = True

        finally:
            self.m_state_manager.release()

        ffork_second_stage = self.handle_fork(ctx)
        self.handle_exec(ctx)

        if self.is_auto_fork_first_stage(ctx.m_thread_id):
            self.request_go_quiet()

        elif self.m_ffork_auto and ffork_second_stage:
            (self.m_step_tid, self.m_next_frame, self.m_return_frame) = self.m_saved_step
            self.m_saved_step = (None, None, None)
            self.m_bp_manager.m_fhard_tbp = False
            self.request_go_quiet()

        elif self.get_clients_attached() == 0:
            #print_debug('state: %s' % self.m_state_manager.get_state())
            self.request_go_quiet()

        elif step_tid == ctx.m_thread_id and frame.f_code.co_name == 'rpdb2_import_wrapper':
            self.request_step_quiet()

        else:
            if f_full_notification:
                self.send_events(None) 
            else:
                self.notify_thread_broken(ctx.m_thread_id, ctx.m_thread_name)
                self.notify_namespace()

            if f_uhe_notification:
                self.send_unhandled_exception_event()
                
            state = self.m_state_manager.wait_for_state([STATE_RUNNING])
      
        self.prepare_fork_step(ctx.m_thread_id)
        self.prepare_exec_step(ctx.m_thread_id)

        ctx.m_fUnhandledException = False
        ctx.m_fBroken = False 
        ctx.set_tracers()
        ctx.reset_exc_info()

        if g_fos_exit:
            g_fos_exit = False
            self.send_event_exit()
            time.sleep(1.0)
            self.stoptrace()


    def is_auto_fork_first_stage(self, tid):
        if not self.m_ffork_auto:
            return False

        return tid == g_forktid and g_forkpid == None


    def prepare_fork_step(self, tid):
        global g_forkpid
        global g_ignore_broken_pipe

        if tid != g_forktid:
            return

        self.m_step_tid = tid
        g_forkpid = os.getpid()
        
        if not self.m_ffork_into_child:
            return

        n = self.get_clients_attached()
        self.send_fork_switch(n)
        time.sleep(0.5)
        g_server.shutdown()
        CThread.joinAll()

        g_ignore_broken_pipe = time.time()


    def handle_fork(self, ctx):
        global g_forktid
        global g_forkpid

        tid = ctx.m_thread_id

        if g_forkpid == None or tid != g_forktid:
            return False

        forkpid = g_forkpid
        g_forkpid = None
        g_forktid = None

        if os.getpid() == forkpid:
            #
            # Parent side of fork().
            #

            if not self.m_ffork_into_child:
                #CThread.clearJoin()
                #g_server.jumpstart()
               
                return True

            self.stoptrace()
            return False

        #
        # Child side of fork().
        #

        if not self.m_ffork_into_child:
            self.stoptrace()
            return False
       
        self.m_threads = {tid: ctx}
        
        CThread.clearJoin()
        g_server.jumpstart()
        
        return True


    def prepare_exec_step(self, tid):
        global g_execpid

        if tid != g_exectid:
            return

        self.m_step_tid = tid
        g_execpid = os.getpid()

        n = self.get_clients_attached()
        self.send_exec_switch(n)
        time.sleep(0.5)
        g_server.shutdown()
        CThread.joinAll()


    def handle_exec(self, ctx):
        global g_exectid
        global g_execpid

        tid = ctx.m_thread_id

        if g_execpid == None or tid != g_exectid:
            return False

        g_execpid = None
        g_exectid = None

        #
        # If we are here it means that the exec failed.
        # Jumpstart the debugger to allow debugging to continue.
        #

        CThread.clearJoin()
        g_server.jumpstart()
        
        return True


    def notify_thread_broken(self, tid, name):
        """
        Notify that thread (tid) has broken.
        This notification is sent for each thread that breaks after
        the first one.
        """
        
        _event = CEventThreadBroken(tid, name)
        self.m_event_dispatcher.fire_event(_event)

    
    def notify_namespace(self):
        """
        Notify that a namespace update query should be done.
        """
        
        _event = CEventNamespace()
        self.m_event_dispatcher.fire_event(_event)


    def get_state(self):
        return self.m_state_manager.get_state()


    def verify_broken(self):
        if self.m_state_manager.get_state() != STATE_BROKEN:
            raise DebuggerNotBroken

    
    def get_current_filename(self, frame_index, fException):
        """
        Return path of sources corresponding to the frame at depth
        'frame_index' down the stack of the current thread.
        """
        
        ctx = self.get_current_ctx()
        
        try:
            f = None
            base_frame = ctx.frame_acquire()

            (f, frame_lineno) = ctx.get_frame(base_frame, frame_index, fException)
            frame_filename = calc_frame_path(f)

            return frame_filename

        finally:
            f = None
            base_frame = None            
            ctx.frame_release()

        
    def get_threads(self):
        return self.m_threads


    def set_break_dont_lock(self):
        self.m_f_first_to_break = True            

        self.m_state_manager.set_state(STATE_BROKEN, fLock = False)

        self.set_break_flag()
        self.set_all_tracers()


    def request_break(self):
        """
        Ask debugger to break (pause debuggee).
        """
        
        if len(self.m_threads) == 0:
            self.wait_for_first_thread()
        
        try:
            self.m_state_manager.acquire()
            if self.m_state_manager.get_state() == STATE_BROKEN:
                return

            self.set_break_dont_lock()

        finally:    
            self.m_state_manager.release()

        self.send_events(None)


    def request_go_quiet(self, fLock = True):
        try:
            self.request_go(fLock)
        
        except DebuggerNotBroken:
            pass


    def request_go(self, fLock = True):
        """
        Let debugger run.
        """
       
        try:
            if fLock:
                self.m_state_manager.acquire()
                
            self.verify_broken()

            self.m_fUnhandledException = False
            self.m_state_manager.set_state(STATE_RUNNING, fLock = False)

            if self.m_fembedded:
                time.sleep(0.33)
                
            self.set_break_flag()

        finally:    
            if fLock:
                self.m_state_manager.release()


    def request_go_breakpoint(self, filename, scope, lineno, frame_index, fException):
        """
        Let debugger run until temp breakpoint as defined in the arguments.
        """

        assert(is_unicode(filename))
        assert(is_unicode(scope))
        
        try:
            self.m_state_manager.acquire()
            self.verify_broken()

            if filename in [None, '']:
                _filename = self.get_current_filename(frame_index, fException)
            elif not is_provider_filesystem(filename):
                _filename = as_string(filename, sys.getfilesystemencoding())
            else:
                _filename = FindFile(filename, fModules = True)

            self.m_bp_manager.set_temp_breakpoint(_filename, scope, lineno)
            self.set_all_tracers()
            self.request_go(fLock = False)

        finally:    
            self.m_state_manager.release()


    def request_step_quiet(self, fLock = True):
        try:
            self.request_step(fLock)
        
        except DebuggerNotBroken:
            pass


    def request_step(self, fLock = True):
        """
        Let debugger run until next statement is reached or a breakpoint 
        is hit in another thread.
        """
        
        try:
            if fLock:
                self.m_state_manager.acquire()
                
            self.verify_broken()

            try:
                ctx = self.get_current_ctx()
            except NoThreads:
                return
                
            self.m_step_tid = ctx.m_thread_id
            self.m_next_frame = None
            self.m_return_frame = None       

            self.request_go(fLock = False)

        finally:    
            if fLock:
                self.m_state_manager.release()

        
    def request_next(self): 
        """
        Let debugger run until next statement in the same frame 
        is reached or a breakpoint is hit in another thread.
        """
        
        try:
            self.m_state_manager.acquire()
            self.verify_broken()

            try:
                ctx = self.get_current_ctx()
            except NoThreads:
                return
                
            if self.m_lastest_event in ['return', 'exception']:
                return self.request_step(fLock = False)

            self.m_next_frame = ctx.m_frame
            self.m_return_frame = None
            
            self.request_go(fLock = False)

        finally:    
            self.m_state_manager.release()

        
    def request_return(self):    
        """
        Let debugger run until end of frame frame is reached 
        or a breakpoint is hit in another thread.
        """
        
        try:
            self.m_state_manager.acquire()
            self.verify_broken()

            try:
                ctx = self.get_current_ctx()
            except NoThreads:
                return
                
            if self.m_lastest_event == 'return':
                return self.request_step(fLock = False)
                
            self.m_next_frame = None
            self.m_return_frame = ctx.m_frame

            self.request_go(fLock = False)

        finally:    
            self.m_state_manager.release()

        
    def request_jump(self, lineno):
        """
        Jump to line number 'lineno'.
        """
        
        try:
            self.m_state_manager.acquire()
            self.verify_broken()

            try:
                ctx = self.get_current_ctx()
            except NoThreads:
                return
                
            frame = ctx.m_frame
            code = frame.f_code

            valid_lines = CalcValidLines(code)
            sbi = CScopeBreakInfo(as_unicode(''), valid_lines)
            l = sbi.CalcScopeLine(lineno)

            frame.f_lineno = l

        finally:    
            frame = None
            self.m_state_manager.release()

        self.send_events(None)


    def set_thread(self, tid):
        """
        Switch focus to specified thread.
        """
        
        try:
            self.m_state_manager.acquire()
            self.verify_broken()

            try:
                if (tid >= 0) and (tid < 100):
                    _tid = list(self.m_threads.keys())[tid]
                else:
                    _tid = tid
                    
                ctx = self.m_threads[_tid]
            except (IndexError, KeyError):
                raise ThreadNotFound

            self.m_current_ctx = ctx
            self.m_lastest_event = ctx.m_event

        finally:
            self.m_state_manager.release()

        self.send_events(None) 



class CDebuggerEngine(CDebuggerCore):
    """
    Main class for the debugger.
    Adds functionality on top of CDebuggerCore.
    """
    
    def __init__(self, fembedded = False):
        CDebuggerCore.__init__(self, fembedded)

        event_type_dict = {
            CEventState: {}, 
            CEventStackDepth: {}, 
            CEventBreakpoint: {}, 
            CEventThreads: {},
            CEventNoThreads: {},
            CEventThreadBroken: {},
            CEventNamespace: {},
            CEventUnhandledException: {},
            CEventStack: {},
            CEventNull: {},
            CEventExit: {},
            CEventForkSwitch: {},
            CEventExecSwitch: {},
            CEventSynchronicity: {},
            CEventTrap: {},
            CEventForkMode: {},
            CEventPsycoWarning: {},
            CEventConflictingModules: {},
            CEventSignalIntercepted: {},
            CEventSignalException: {},
            CEventClearSourceCache: {},
            CEventEmbeddedSync: {}
            }

        self.m_event_queue = CEventQueue(self.m_event_dispatcher)
        self.m_event_queue.register_event_types(event_type_dict)

        event_type_dict = {CEventSync: {}}
        self.m_event_dispatcher.register_callback(self.send_events, event_type_dict, fSingleUse = False)


    def shutdown(self):
        self.m_event_queue.shutdown()
        
        CDebuggerCore.shutdown(self)


       
    def sync_with_events(self, fException, fSendUnhandled):
        """
        Send debugger state to client.
        """
        
        if len(self.m_threads) == 0:
            self.wait_for_first_thread()
        
        index = self.m_event_queue.get_event_index()
        event = CEventSync(fException, fSendUnhandled)
        self.m_event_dispatcher.fire_event(event)
        return index


    def trap_conflicting_modules(self):
        modules_list = []

        for m in CONFLICTING_MODULES:
            if m in g_found_conflicting_modules:
                continue

            if not m in sys.modules:
                continue

            if m == 'psyco':
                #
                # Old event kept for compatibility.
                # 
                event = CEventPsycoWarning()
                self.m_event_dispatcher.fire_event(event)
            
            g_found_conflicting_modules.append(m)
            modules_list.append(as_unicode(m))

        if modules_list == []:
            return False

        event = CEventConflictingModules(modules_list)
        self.m_event_dispatcher.fire_event(event)

        return True


    def wait_for_event(self, timeout, event_index):
        """
        Wait for new events and return them as list of events.
        """

        self.cancel_request_go_timer()
        self.trap_conflicting_modules()

        (new_event_index, sel) = self.m_event_queue.wait_for_event(timeout, event_index)

        if self.trap_conflicting_modules():
            (new_event_index, sel) = self.m_event_queue.wait_for_event(timeout, event_index)

        return (new_event_index, sel)


    def set_breakpoint(self, filename, scope, lineno, fEnabled, expr, frame_index, fException, encoding):
        print_debug('Setting breakpoint to: %s, %s, %d' % (repr(filename), scope, lineno))

        assert(is_unicode(filename))
        assert(is_unicode(scope))
        assert(is_unicode(expr))

        fLock = False
        
        try:    
            if filename in [None, '']:
                self.m_state_manager.acquire()
                fLock = True
                self.verify_broken()
                
                _filename = self.get_current_filename(frame_index, fException)
            elif not is_provider_filesystem(filename):
                _filename = as_string(filename, sys.getfilesystemencoding())
            else:
                _filename = FindFile(filename, fModules = True)
            
            if expr != '':
                try:
                    encoding = self.__calc_encoding(encoding, filename = _filename)
                    _expr = as_bytes(ENCODING_SOURCE % encoding + expr, encoding)
                    compile(_expr, '<string>', 'eval')
                except:
                    raise SyntaxError

            encoding = as_unicode(encoding)

            bp = self.m_bp_manager.set_breakpoint(_filename, scope, lineno, fEnabled, expr, encoding)
            self.set_all_tracers()

            event = CEventBreakpoint(bp)
            #print_debug(repr(vars(bp)))
            self.m_event_dispatcher.fire_event(event)

        finally:
            if fLock:
                self.m_state_manager.release()

        
    def disable_breakpoint(self, id_list, fAll):
        self.m_bp_manager.disable_breakpoint(id_list, fAll)
        self.set_all_tracers()

        event = CEventBreakpoint(None, CEventBreakpoint.DISABLE, id_list, fAll)
        self.m_event_dispatcher.fire_event(event)

        
    def enable_breakpoint(self, id_list, fAll):
        self.m_bp_manager.enable_breakpoint(id_list, fAll)
        self.set_all_tracers()

        event = CEventBreakpoint(None, CEventBreakpoint.ENABLE, id_list, fAll)
        self.m_event_dispatcher.fire_event(event)

        
    def delete_breakpoint(self, id_list, fAll):
        self.m_bp_manager.delete_breakpoint(id_list, fAll)
        self.set_all_tracers()

        event = CEventBreakpoint(None, CEventBreakpoint.REMOVE, id_list, fAll)
        self.m_event_dispatcher.fire_event(event)

        
    def get_breakpoints(self):
        """
        return id->breakpoint dictionary.
        """
        
        bpl = self.m_bp_manager.get_breakpoints()
        _items = [(id, breakpoint_copy(bp)) for (id, bp) in bpl.items()]
        for (id, bp) in _items:
            bp.m_code = None
            
        _bpl = dict(_items)
        
        return _bpl        


    def send_events(self, event):
        """
        Send series of events that define the debugger state.
        """
        
        if isinstance(event, CEventSync):
            fException = event.m_fException
            fSendUnhandled = event.m_fSendUnhandled
        else:
            fException = False
            fSendUnhandled = False

        try:
            if isinstance(event, CEventSync) and not fException:
                self.m_state_manager.set_state()
                
            self.send_stack_depth()
            self.send_threads_event(fException)
            self.send_stack_event(fException)
            self.send_namespace_event()

            if fSendUnhandled and self.m_fUnhandledException:
                self.send_unhandled_exception_event()
            
        except NoThreads:
            self.send_no_threads_event()
            
        except:
            print_debug_exception()
            raise

       
    def send_unhandled_exception_event(self):
        event = CEventUnhandledException()
        self.m_event_dispatcher.fire_event(event)

        
    def send_stack_depth(self):
        """
        Send event with stack depth and exception stack depth.
        """
        
        f = None
        tb = None
        ctx = self.get_current_ctx()
        
        try:
            try:
                f = ctx.frame_acquire()
            except ThreadDone:
                return

            s = my_extract_stack(f)
            s = [1 for (a, b, c, d) in s if g_fDebug or c != 'rpdb2_import_wrapper']
                
            stack_depth = len(s)

            tb = get_traceback(f, ctx)
            if tb == None:
                stack_depth_exception = None

            else:    
                s = my_extract_stack(tb.tb_frame.f_back)
                s += my_extract_tb(tb)
                s = [1 for (a, b, c, d) in s if g_fDebug or c != 'rpdb2_import_wrapper']
                    
                stack_depth_exception = len(s)

            event = CEventStackDepth(stack_depth, stack_depth_exception)
            self.m_event_dispatcher.fire_event(event)
            
        finally:
            f = None
            tb = None
            ctx.frame_release()

            
    def send_threads_event(self, fException):
        """
        Send event with current thread list.
        In case of exception, send only the current thread.
        """
        
        tl = self.get_thread_list()
            
        if fException:
            ctid = tl[0]
            itl = tl[1]
            _itl = [a for a in itl if a[DICT_KEY_TID] == ctid]
            _tl = (ctid, _itl)
        else:
            _tl = tl

        event = CEventThreads(*_tl)
        self.m_event_dispatcher.fire_event(event)


    def send_stack_event(self, fException):
        sl = self.get_stack([], False, fException)

        if len(sl) == 0:
            return
            
        event = CEventStack(sl[0])
        self.m_event_dispatcher.fire_event(event)

        
    def send_namespace_event(self):
        """
        Send event notifying namespace should be queried again.
        """
        
        event = CEventNamespace()
        self.m_event_dispatcher.fire_event(event)


    def send_no_threads_event(self):
        _event = CEventNoThreads()
        self.m_event_dispatcher.fire_event(_event)


    def send_event_null(self):
        """
        Make the event waiter return.
        """
        
        event = CEventNull()
        self.m_event_dispatcher.fire_event(event)


    def __get_stack(self, ctx, ctid, fException):
        tid = ctx.m_thread_id    

        f = None
        _f = None
        tb = None
        _tb = None

        try:
            try:
                f = ctx.frame_acquire()
            except ThreadDone:
                return None

            if fException: 
                tb = get_traceback(f, ctx)
                if tb == None:
                    raise NoExceptionFound

                _tb = tb
                while _tb.tb_next is not None:
                    _tb = _tb.tb_next

                _f = _tb.tb_frame    
                s = my_extract_stack(tb.tb_frame.f_back)
                s += my_extract_tb(tb)

            else:
                _f = f
                s = my_extract_stack(f)
                    
            code_list = []
            while _f is not None:
                rc = repr(_f.f_code).split(',')[0].split()[-1]
                rc = as_unicode(rc)
                code_list.insert(0, rc)
                _f = _f.f_back
                
        finally:
            f = None
            _f = None
            tb = None
            _tb = None

            ctx.frame_release()

        #print code_list
               
        __s = [(a, b, c, d) for (a, b, c, d) in s if g_fDebug or c != 'rpdb2_import_wrapper']

        if (ctx.m_uef_lineno is not None) and (len(__s) > 0):
            (a, b, c, d) = __s[0]
            __s = [(a, ctx.m_uef_lineno, c, d)] + __s[1:] 
           
        r = {}
        r[DICT_KEY_STACK] = __s
        r[DICT_KEY_CODE_LIST] = code_list
        r[DICT_KEY_TID] = tid
        r[DICT_KEY_BROKEN] = ctx.m_fBroken
        r[DICT_KEY_EVENT] = as_unicode([ctx.m_event, 'exception'][fException])
        
        if tid == ctid:
            r[DICT_KEY_CURRENT_TID] = True
            
        return r

    
    def get_stack(self, tid_list, fAll, fException):
        if fException and (fAll or (len(tid_list) != 0)):
            raise BadArgument

        ctx = self.get_current_ctx()       
        ctid = ctx.m_thread_id

        if fAll:
            ctx_list = list(self.get_threads().values())
        elif fException or (len(tid_list) == 0):
            ctx_list = [ctx]
        else:
            ctx_list = [self.get_threads().get(t, None) for t in tid_list]

        _sl = [self.__get_stack(ctx, ctid, fException) for ctx in ctx_list if ctx is not None]
        sl = [s for s in _sl if s is not None] 
        
        return sl


    def get_source_file(self, filename, lineno, nlines, frame_index, fException):  
        assert(is_unicode(filename))

        if lineno < 1:
            lineno = 1
            nlines = -1

        _lineno = lineno
        r = {}
        frame_filename = None
        
        try:
            ctx = self.get_current_ctx()

            try:
                f = None
                base_frame = None
                
                base_frame = ctx.frame_acquire()
                (f, frame_lineno) = ctx.get_frame(base_frame, frame_index, fException)
                frame_filename = calc_frame_path(f)

            finally:
                f = None
                base_frame = None            
                ctx.frame_release()

            frame_event = [[ctx.m_event, 'call'][frame_index > 0], 'exception'][fException]
            
        except NoThreads:
            if filename in [None, '']:
                raise

        if filename in [None, '']:
            __filename = frame_filename
            r[DICT_KEY_TID] = ctx.m_thread_id
        elif not is_provider_filesystem(filename):
            __filename = as_string(filename, sys.getfilesystemencoding())
        else:    
            __filename = FindFile(filename, fModules = True)
            if not IsPythonSourceFile(__filename):
                raise NotPythonSource

        _filename = winlower(__filename)    

        lines = []
        breakpoints = {}
        fhide_pwd_mode = False

        while nlines != 0:
            try:
                g_traceback_lock.acquire()
                line = get_source_line(_filename, _lineno)
                
            finally:    
                g_traceback_lock.release()

            if line == '':
                break

            #
            # Remove any trace of session password from data structures that 
            # go over the network.
            #

            if fhide_pwd_mode:
                if not ')' in line:
                    line = as_unicode('...\n')
                else:
                    line = '...""")' + line.split(')', 1)[1]
                    fhide_pwd_mode = False

            elif 'start_embedded_debugger(' in line:
                ls = line.split('start_embedded_debugger(', 1)
                line = ls[0] + 'start_embedded_debugger("""...Removed-password-from-output...'
                
                if ')' in ls[1]:
                    line += '""")' + ls[1].split(')', 1)[1]
                else:
                    line += '\n'
                    fhide_pwd_mode = True

            lines.append(line)

            try:
                bp = self.m_bp_manager.get_breakpoint(_filename, _lineno)
                breakpoints[_lineno] = as_unicode([STATE_DISABLED, STATE_ENABLED][bp.isEnabled()])
            except KeyError:
                pass
                
            _lineno += 1
            nlines -= 1

        if frame_filename == _filename:
            r[DICT_KEY_FRAME_LINENO] = frame_lineno
            r[DICT_KEY_EVENT] = as_unicode(frame_event)
            r[DICT_KEY_BROKEN] = ctx.m_fBroken
            
        r[DICT_KEY_LINES] = lines
        r[DICT_KEY_FILENAME] = as_unicode(_filename, sys.getfilesystemencoding())
        r[DICT_KEY_BREAKPOINTS] = breakpoints
        r[DICT_KEY_FIRST_LINENO] = lineno
        
        return r

            
    def __get_source(self, ctx, nlines, frame_index, fException):
        tid = ctx.m_thread_id
        _frame_index = [0, frame_index][tid == self.m_current_ctx.m_thread_id]

        try:
            try:
                f = None
                base_frame = None
                
                base_frame = ctx.frame_acquire()
                (f, frame_lineno)  = ctx.get_frame(base_frame, _frame_index, fException)
                frame_filename = calc_frame_path(f)
                
            except (ThreadDone, InvalidFrame):
                return None

        finally:
            f = None
            base_frame = None            
            ctx.frame_release()
            
        frame_event = [[ctx.m_event, 'call'][frame_index > 0], 'exception'][fException]

        first_line = max(1, frame_lineno - nlines // 2)     
        _lineno = first_line

        lines = []
        breakpoints = {}
        fhide_pwd_mode = False
        
        while nlines != 0:
            try:
                g_traceback_lock.acquire()
                line = get_source_line(frame_filename, _lineno)
                
            finally:    
                g_traceback_lock.release()

            if line == '':
                break

            #
            # Remove any trace of session password from data structures that 
            # go over the network.
            #

            if fhide_pwd_mode:
                if not ')' in line:
                    line = as_unicode('...\n')
                else:
                    line = '...""")' + line.split(')', 1)[1]
                    fhide_pwd_mode = False

            elif 'start_embedded_debugger(' in line:
                ls = line.split('start_embedded_debugger(', 1)
                line = ls[0] + 'start_embedded_debugger("""...Removed-password-from-output...'
                
                if ')' in ls[1]:
                    line += '""")' + ls[1].split(')', 1)[1]
                else:
                    line += '\n'
                    fhide_pwd_mode = True

            lines.append(line)

            try:
                bp = self.m_bp_manager.get_breakpoint(frame_filename, _lineno)
                breakpoints[_lineno] = as_unicode([STATE_DISABLED, STATE_ENABLED][bp.isEnabled()])
            except KeyError:
                pass
                
            _lineno += 1
            nlines -= 1

        r = {}
        
        r[DICT_KEY_FRAME_LINENO] = frame_lineno
        r[DICT_KEY_EVENT] = as_unicode(frame_event)
        r[DICT_KEY_BROKEN] = ctx.m_fBroken
        r[DICT_KEY_TID] = tid
        r[DICT_KEY_LINES] = lines
        r[DICT_KEY_FILENAME] = as_unicode(frame_filename, sys.getfilesystemencoding())
        r[DICT_KEY_BREAKPOINTS] = breakpoints
        r[DICT_KEY_FIRST_LINENO] = first_line
        
        return r

     
    def get_source_lines(self, nlines, fAll, frame_index, fException):
        if fException and fAll:
            raise BadArgument
            
        if fAll:
            ctx_list = list(self.get_threads().values())
        else:
            ctx = self.get_current_ctx()
            ctx_list = [ctx]

        _sl = [self.__get_source(ctx, nlines, frame_index, fException) for ctx in ctx_list]
        sl = [s for s in _sl if s is not None]    

        return sl


    def __get_locals_globals(self, frame_index, fException, fReadOnly = False):
        ctx = self.get_current_ctx()
        (_globals, _locals, _original_locals_copy) = ctx.get_locals_copy(frame_index, fException, fReadOnly)

        return (_globals, _locals, _original_locals_copy)

   
    def __calc_number_of_subnodes(self, r):
        for t in [bytearray, bytes, str, str8, unicode, int, long, float, bool, type(None)]:
            if t is type(r):
                return 0
       
        try:
            try:
                if isinstance(r, frozenset) or isinstance(r, set):
                    return len(r)

            except NameError:
                pass

            if isinstance(r, sets.BaseSet):
                return len(r)

            if isinstance(r, dict):
                return len(r)

            if isinstance(r, list):
                return len(r)

            if isinstance(r, tuple):
                return len(r)

            return len(dir(r))
            
        except AttributeError:
            return 0

        return 0


    def __calc_subnodes(self, expr, r, fForceNames, filter_level, repr_limit, encoding):
        snl = []
        
        try:
            if isinstance(r, frozenset) or isinstance(r, set):
                if len(r) > MAX_SORTABLE_LENGTH:
                    g = r
                else:
                    g = [i for i in r]
                    sort(g)

                for i in g:
                    if len(snl) >= MAX_NAMESPACE_ITEMS:
                        snl.append(MAX_NAMESPACE_WARNING)
                        break
                    
                    is_valid = [True]
                    rk = repr_ltd(i, REPR_ID_LENGTH, encoding = ENCODING_RAW_I)

                    e = {}
                    e[DICT_KEY_EXPR] = as_unicode('_RPDB2_FindRepr((%s), %d)["%s"]' % (expr, REPR_ID_LENGTH, rk.replace('"', '&quot')))
                    e[DICT_KEY_NAME] = repr_ltd(i, repr_limit, encoding)
                    e[DICT_KEY_REPR] = repr_ltd(i, repr_limit, encoding, is_valid)
                    e[DICT_KEY_IS_VALID] = is_valid[0]
                    e[DICT_KEY_TYPE] = as_unicode(parse_type(type(i)))
                    e[DICT_KEY_N_SUBNODES] = self.__calc_number_of_subnodes(i)

                    snl.append(e)
                
                return snl

        except NameError:
            pass
        
        if isinstance(r, sets.BaseSet):
            if len(r) > MAX_SORTABLE_LENGTH:
                g = r
            else:
                g = [i for i in r]
                sort(g)

            for i in g:
                if len(snl) >= MAX_NAMESPACE_ITEMS:
                    snl.append(MAX_NAMESPACE_WARNING)
                    break

                is_valid = [True]
                rk = repr_ltd(i, REPR_ID_LENGTH, encoding = ENCODING_RAW_I)

                e = {}
                e[DICT_KEY_EXPR] = as_unicode('_RPDB2_FindRepr((%s), %d)["%s"]' % (expr, REPR_ID_LENGTH, rk.replace('"', '&quot')))
                e[DICT_KEY_NAME] = repr_ltd(i, repr_limit, encoding)
                e[DICT_KEY_REPR] = repr_ltd(i, repr_limit, encoding, is_valid)
                e[DICT_KEY_IS_VALID] = is_valid[0]
                e[DICT_KEY_TYPE] = as_unicode(parse_type(type(i)))
                e[DICT_KEY_N_SUBNODES] = self.__calc_number_of_subnodes(i)

                snl.append(e)
            
            return snl

        if isinstance(r, list) or isinstance(r, tuple):
            for i, v in enumerate(r[0: MAX_NAMESPACE_ITEMS]):
                is_valid = [True]
                e = {}
                e[DICT_KEY_EXPR] = as_unicode('(%s)[%d]' % (expr, i))
                e[DICT_KEY_NAME] = as_unicode(repr(i))
                e[DICT_KEY_REPR] = repr_ltd(v, repr_limit, encoding, is_valid)
                e[DICT_KEY_IS_VALID] = is_valid[0]
                e[DICT_KEY_TYPE] = as_unicode(parse_type(type(v)))
                e[DICT_KEY_N_SUBNODES] = self.__calc_number_of_subnodes(v)

                snl.append(e)

            if len(r) > MAX_NAMESPACE_ITEMS:
                snl.append(MAX_NAMESPACE_WARNING)

            return snl

        if isinstance(r, dict):
            if filter_level == 2 and expr in ['locals()', 'globals()']:
                r = copy.copy(r)
                for k, v in list(r.items()):
                    if parse_type(type(v)) in ['function', 'classobj', 'type']:
                        del r[k]

            if len(r) > MAX_SORTABLE_LENGTH:
                kl = r
            else:
                kl = list(r.keys())
                sort(kl)

            for k in kl:
                #
                # Remove any trace of session password from data structures that 
                # go over the network.
                #
                if k in ['_RPDB2_FindRepr', '_RPDB2_builtins', '_rpdb2_args', '_rpdb2_pwd', 'm_rpdb2_pwd']:
                    continue

                v = r[k]

                if len(snl) >= MAX_NAMESPACE_ITEMS:
                    snl.append(MAX_NAMESPACE_WARNING)
                    break

                is_valid = [True]
                e = {}

                if [True for t in [bool, int, float, bytes, str, unicode, type(None)] if t is type(k)]:
                    rk = repr(k)
                    if len(rk) < REPR_ID_LENGTH:
                        e[DICT_KEY_EXPR] = as_unicode('(%s)[%s]' % (expr, rk))

                if type(k) is str8:
                    rk = repr(k)
                    if len(rk) < REPR_ID_LENGTH:
                        e[DICT_KEY_EXPR] = as_unicode('(%s)[str8(%s)]' % (expr, rk[1:]))

                if not DICT_KEY_EXPR in e:
                    rk = repr_ltd(k, REPR_ID_LENGTH, encoding = ENCODING_RAW_I)
                    e[DICT_KEY_EXPR] = as_unicode('_RPDB2_FindRepr((%s), %d)["%s"]' % (expr, REPR_ID_LENGTH, rk.replace('"', '&quot')))

                e[DICT_KEY_NAME] = as_unicode([repr_ltd(k, repr_limit, encoding), k][fForceNames])
                e[DICT_KEY_REPR] = repr_ltd(v, repr_limit, encoding, is_valid)
                e[DICT_KEY_IS_VALID] = is_valid[0]
                e[DICT_KEY_TYPE] = as_unicode(parse_type(type(v)))
                e[DICT_KEY_N_SUBNODES] = self.__calc_number_of_subnodes(v)

                snl.append(e)

            return snl            

        al = calc_attribute_list(r, filter_level)
        sort(al)

        for a in al:
            if a == 'm_rpdb2_pwd':
                continue

            try:
                v = getattr(r, a)
            except AttributeError:
                continue
            
            if len(snl) >= MAX_NAMESPACE_ITEMS:
                snl.append(MAX_NAMESPACE_WARNING)
                break

            is_valid = [True]
            e = {}
            e[DICT_KEY_EXPR] = as_unicode('(%s).%s' % (expr, a))
            e[DICT_KEY_NAME] = as_unicode(a)
            e[DICT_KEY_REPR] = repr_ltd(v, repr_limit, encoding, is_valid)
            e[DICT_KEY_IS_VALID] = is_valid[0]
            e[DICT_KEY_TYPE] = as_unicode(parse_type(type(v)))
            e[DICT_KEY_N_SUBNODES] = self.__calc_number_of_subnodes(v)

            snl.append(e)

        return snl                


    def get_exception(self, frame_index, fException):
        ctx = self.get_current_ctx()
        
        if is_py3k():
            exc_info = ctx.get_exc_info()
            if exc_info == None:
                return {'type': None, 'value': None, 'traceback': None}

            type, value, traceback = exc_info
            e = {'type': type, 'value': value, 'traceback': traceback}
        
            return e

        try:
            f = None
            base_frame = None
            
            base_frame = ctx.frame_acquire()
            (f, frame_lineno) = ctx.get_frame(base_frame, frame_index, fException)

            e = {'type': f.f_exc_type, 'value': f.f_exc_value, 'traceback': f.f_exc_traceback}

            return e
            
        finally:
            f = None
            base_frame = None            
            ctx.frame_release()


    def is_child_of_failure(self, failed_expr_list, expr):
        for failed_expr in failed_expr_list:
            if expr.startswith(failed_expr):
                return True

        return False        


    def calc_expr(self, expr, fExpand, filter_level, frame_index, fException, _globals, _locals, lock, event, rl, index, repr_limit, encoding):
        e = {}

        try:
            __globals = _globals
            __locals = _locals
            
            if RPDB_EXEC_INFO in expr:
                rpdb_exception_info = self.get_exception(frame_index, fException)
                __globals = globals()
                __locals = locals()

            __locals['_RPDB2_FindRepr'] = _RPDB2_FindRepr

            is_valid = [True]
            r = eval(expr, __globals, __locals)

            e[DICT_KEY_EXPR] = as_unicode(expr)
            e[DICT_KEY_REPR] = repr_ltd(r, repr_limit, encoding, is_valid)
            e[DICT_KEY_IS_VALID] = is_valid[0]
            e[DICT_KEY_TYPE] = as_unicode(parse_type(type(r)))
            e[DICT_KEY_N_SUBNODES] = self.__calc_number_of_subnodes(r)
            
            if fExpand and (e[DICT_KEY_N_SUBNODES] > 0):
                fForceNames = (expr in ['globals()', 'locals()']) or (RPDB_EXEC_INFO in expr)
                e[DICT_KEY_SUBNODES] = self.__calc_subnodes(expr, r, fForceNames, filter_level, repr_limit, encoding)
                e[DICT_KEY_N_SUBNODES] = len(e[DICT_KEY_SUBNODES])
                
        except:
            print_debug_exception()
            e[DICT_KEY_ERROR] = as_unicode(safe_repr(sys.exc_info()))
        
        lock.acquire()
        if len(rl) == index:    
            rl.append(e)
        lock.release()    

        event.set()

    
    def __calc_encoding(self, encoding, fvalidate = False, filename = None):
        if encoding != ENCODING_AUTO and not fvalidate:
            return encoding

        if encoding != ENCODING_AUTO:
            try:
                codecs.lookup(encoding)
                return encoding
            
            except:
                pass

        if filename == None:
            ctx = self.get_current_ctx()
            filename = ctx.m_code_context.m_filename

        try:
            encoding = get_file_encoding(filename)
            return encoding

        except:
            return 'utf-8'
        


    def get_namespace(self, nl, filter_level, frame_index, fException, repr_limit, encoding, fraw):
        if fraw:
            encoding = ENCODING_RAW_I
        else:
            encoding = self.__calc_encoding(encoding, fvalidate = True)

        try:
            (_globals, _locals, x) = self.__get_locals_globals(frame_index, fException, fReadOnly = True)
        except:    
            print_debug_exception()
            raise

        failed_expr_list = []
        rl = []
        index = 0
        lock = threading.Condition()
        
        for (expr, fExpand) in nl:
            if self.is_child_of_failure(failed_expr_list, expr):
                continue

            event = threading.Event()
            args = (expr, fExpand, filter_level, frame_index, fException, _globals, _locals, lock, event, rl, index, repr_limit, encoding)

            if self.m_fsynchronicity:
                g_server.m_work_queue.post_work_item(target = self.calc_expr, args = args, name = 'calc_expr %s' % expr)
            else:
                try:
                    ctx = self.get_current_ctx()
                    tid = ctx.m_thread_id
                    send_job(tid, 0, self.calc_expr, *args)
                except:
                    pass

            safe_wait(event, 2)
            
            lock.acquire()
            if len(rl) == index:
                rl.append('error')
                failed_expr_list.append(expr)
            index += 1    
            lock.release()

            if len(failed_expr_list) > 3:
                break
            
        _rl = [r for r in rl if r != 'error']
        
        return _rl 


    def evaluate(self, expr, frame_index, fException, encoding, fraw):
        """
        Evaluate expression in context of frame at depth 'frame-index'.
        """
        
        result = [(as_unicode(''), as_unicode(STR_SYNCHRONICITY_BAD), as_unicode(''))]

        if self.m_fsynchronicity:
            self._evaluate(result, expr, frame_index, fException, encoding, fraw)
        else:
            try:
                ctx = self.get_current_ctx()
                tid = ctx.m_thread_id
                send_job(tid, 1000, self._evaluate, result, expr, frame_index, fException, encoding, fraw) 
            except:
                pass

        return result[-1]

            
    def _evaluate(self, result, expr, frame_index, fException, encoding, fraw):
        """
        Evaluate expression in context of frame at depth 'frame-index'.
        """
        
        encoding = self.__calc_encoding(encoding)

        (_globals, _locals, x) = self.__get_locals_globals(frame_index, fException)

        v = ''
        w = ''
        e = ''

        try:
            if '_rpdb2_pwd' in expr or '_rpdb2_args' in expr:
                r = '...Removed-password-from-output...'
            
            else:
                _expr = as_bytes(ENCODING_SOURCE % encoding + expr, encoding, fstrict = True)

                if '_RPDB2_builtins' in expr:
                    _locals['_RPDB2_builtins'] = vars(g_builtins_module)

                try:                
                    redirect_exc_info = True
                    r = eval(_expr, _globals, _locals)

                finally:
                    del redirect_exc_info
                    
                    if '_RPDB2_builtins' in expr:
                        del _locals['_RPDB2_builtins']

        
            if fraw:
                encoding = ENCODING_RAW_I

            v = repr_ltd(r, MAX_EVALUATE_LENGTH, encoding)
            
            if len(v) > MAX_EVALUATE_LENGTH:
                v += '... *** %s ***' % STR_MAX_EVALUATE_LENGTH_WARNING 
                w = STR_MAX_EVALUATE_LENGTH_WARNING

        except:
            exc_info = sys.exc_info()
            e = "%s, %s" % (safe_str(exc_info[0]), safe_str(exc_info[1]))

        self.notify_namespace()

        result.append((as_unicode(v), as_unicode(w), as_unicode(e)))

        
    def execute(self, suite, frame_index, fException, encoding):
        """
        Execute suite (Python statement) in context of frame at 
        depth 'frame-index'.
        """
        
        result = [(as_unicode(STR_SYNCHRONICITY_BAD), as_unicode(''))]

        if self.m_fsynchronicity:
            self._execute(result, suite, frame_index, fException, encoding)
        else:
            try:
                ctx = self.get_current_ctx()
                tid = ctx.m_thread_id
                send_job(tid, 1000, self._execute, result, suite, frame_index, fException, encoding) 
            except:
                pass

        return result[-1]


    def _execute(self, result, suite, frame_index, fException, encoding):
        """
        Execute suite (Python statement) in context of frame at 
        depth 'frame-index'.
        """
       
        print_debug('exec called with: ' + repr(suite))

        encoding = self.__calc_encoding(encoding)

        (_globals, _locals, _original_locals_copy) = self.__get_locals_globals(frame_index, fException)

        if frame_index > 0 and not _globals is _locals:
            _locals_copy = copy.copy(_locals)
        
        w = ''
        e = ''

        try:
            if '_RPDB2_FindRepr' in suite and not '_RPDB2_FindRepr' in _original_locals_copy:
                _locals['_RPDB2_FindRepr'] = _RPDB2_FindRepr

            try:
                _suite = as_bytes(ENCODING_SOURCE % encoding + suite, encoding, fstrict = True)
                #print_debug('suite is %s' % repr(_suite))
                
                _code = compile(_suite, '<string>', 'exec')

                try:
                    redirect_exc_info = True
                    exec(_code, _globals, _locals)

                finally:
                    del redirect_exc_info

            finally:
                if '_RPDB2_FindRepr' in suite and not '_RPDB2_FindRepr' in _original_locals_copy:
                    del _locals['_RPDB2_FindRepr']

        except:    
            exc_info = sys.exc_info()
            e = "%s, %s" % (safe_str(exc_info[0]), safe_str(exc_info[1]))

        if frame_index > 0 and (not _globals is _locals) and _locals != _locals_copy:
            l = [(k, safe_repr(v)) for k, v in _locals.items()]
            sl = set(l)

            lc = [(k, safe_repr(v)) for k, v in _locals_copy.items()]
            slc = set(lc)

            nsc = [k for (k, v) in sl - slc if k in _original_locals_copy]
            if len(nsc) != 0:
                w = STR_LOCAL_NAMESPACE_WARNING
        
        self.notify_namespace()
        
        result.append((as_unicode(w), as_unicode(e)))


    def __decode_thread_name(self, name):
        name = as_unicode(name)
        return name


    def get_thread_list(self):
        """
        Return thread list with tid, state, and last event of each thread.
        """
        
        ctx = self.get_current_ctx()
        
        if ctx is None:
            current_thread_id = -1
        else:
            current_thread_id = ctx.m_thread_id  
            
        ctx_list = list(self.get_threads().values())
       
        tl = []
        for c in ctx_list:
            d = {}
            d[DICT_KEY_TID] = c.m_thread_id
            d[DICT_KEY_NAME] = self.__decode_thread_name(c.m_thread_name)
            d[DICT_KEY_BROKEN] = c.m_fBroken
            d[DICT_KEY_EVENT] = as_unicode(c.m_event)
            tl.append(d)

        return (current_thread_id, tl)


    def stop_debuggee(self):
        """
        Notify the client and terminate this proccess.
        """

        g_server.m_work_queue.post_work_item(target = _atexit, args = (True, ), name = '_atexit')


    def set_synchronicity(self, fsynchronicity):
        self.m_fsynchronicity = fsynchronicity

        event = CEventSynchronicity(fsynchronicity)
        self.m_event_dispatcher.fire_event(event)

        if self.m_state_manager.get_state() == STATE_BROKEN:
            self.notify_namespace()


    def set_trap_unhandled_exceptions(self, ftrap):
        self.m_ftrap = ftrap

        event = CEventTrap(ftrap)
        self.m_event_dispatcher.fire_event(event)


    def is_unhandled_exception(self):
        return self.m_fUnhandledException


    def set_fork_mode(self, ffork_into_child, ffork_auto):
        self.m_ffork_into_child = ffork_into_child
        self.m_ffork_auto = ffork_auto

        event = CEventForkMode(ffork_into_child, ffork_auto)
        self.m_event_dispatcher.fire_event(event)


    def set_environ(self, envmap):
        global g_fignorefork

        print_debug('Entered set_environ() with envmap = %s' % repr(envmap))

        if len(envmap) == 0:
            return

        old_pythonpath = os.environ.get('PYTHONPATH', '')

        encoding = detect_locale() 

        for k, v in envmap:
            try:
                k = as_string(k, encoding, fstrict = True)
                v = as_string(v, encoding, fstrict = True)
            except:
                continue

            command = 'echo %s' % v
            
            try:
                g_fignorefork = True
                f = platform.popen(command)

            finally:
                g_fignorefork = False

            value = f.read()
            f.close()
            
            if value[-1:] == '\n':
                value = value[:-1]

            os.environ[k] = value

        if 'PYTHONPATH' in [k for (k, v) in envmap]:
            recalc_sys_path(old_pythonpath)


    
#
# ------------------------------------- RPC Server --------------------------------------------
#



class CWorkQueue:
    """
    Worker threads pool mechanism for RPC server.    
    """
    
    def __init__(self, size = N_WORK_QUEUE_THREADS):
        self.m_lock = threading.Condition()
        self.m_work_items = []
        self.m_f_shutdown = False

        self.m_size = size
        self.m_n_threads = 0
        self.m_n_available = 0

        self.__create_thread()
        

    def __create_thread(self): 
        t = CThread(name = '__worker_target', target = self.__worker_target, shutdown = self.shutdown)
        #thread_set_daemon(t, True)
        t.start()


    def shutdown(self):
        """
        Signal worker threads to exit, and wait until they do.
        """
       
        if self.m_f_shutdown:
            return

        print_debug('Shutting down worker queue...')

        self.m_lock.acquire()
        self.m_f_shutdown = True
        lock_notify_all(self.m_lock)

        t0 = time.time()

        while self.m_n_threads > 0:
            if time.time() - t0 > SHUTDOWN_TIMEOUT:
                self.m_lock.release()
                print_debug('Shut down of worker queue has TIMED OUT!')
                return

            safe_wait(self.m_lock, 0.1)
            
        self.m_lock.release()
        print_debug('Shutting down worker queue, done.')


    def __worker_target(self): 
        try:
            self.m_lock.acquire()
            
            self.m_n_threads += 1
            self.m_n_available += 1
            fcreate_thread = not self.m_f_shutdown and self.m_n_threads < self.m_size            
            
            self.m_lock.release()
            
            if fcreate_thread:
                self.__create_thread()
                
            self.m_lock.acquire()

            while not self.m_f_shutdown:
                safe_wait(self.m_lock)

                if self.m_f_shutdown:
                    break
                    
                if len(self.m_work_items) == 0:
                    continue
                    
                fcreate_thread = self.m_n_available == 1

                (target, args, name) = self.m_work_items.pop()

                self.m_n_available -= 1                
                self.m_lock.release()

                if fcreate_thread:
                    print_debug('Creating an extra worker thread.')
                    self.__create_thread()
                    
                thread_set_name(current_thread(), '__worker_target - ' + name)

                try:
                    target(*args)
                except:
                    print_debug_exception()

                thread_set_name(current_thread(), '__worker_target')

                self.m_lock.acquire()
                self.m_n_available += 1

                if self.m_n_available > self.m_size:
                    break
                    
            self.m_n_threads -= 1
            self.m_n_available -= 1 
            lock_notify_all(self.m_lock)
            
        finally:
            self.m_lock.release()


    def post_work_item(self, target, args, name = ''):
        if self.m_f_shutdown:
            return
            
        try:
            self.m_lock.acquire()

            if self.m_f_shutdown:
                return
            
            self.m_work_items.append((target, args, name))

            self.m_lock.notify()
            
        finally:
            self.m_lock.release()
                
        

#
# MOD
#
class CUnTracedThreadingMixIn(SocketServer.ThreadingMixIn):
    """
    Modification of SocketServer.ThreadingMixIn that uses a worker thread
    queue instead of spawning threads to process requests.
    This mod was needed to resolve deadlocks that were generated in some 
    circumstances.
    """

    def process_request(self, request, client_address):
        g_server.m_work_queue.post_work_item(target = SocketServer.ThreadingMixIn.process_request_thread, args = (self, request, client_address), name = 'process_request')



#
# MOD
#
def my_xmlrpclib_loads(data):
    """
    Modification of Python 2.3 xmlrpclib.loads() that does not do an 
    import. Needed to prevent deadlocks.
    """
    
    p, u = xmlrpclib.getparser()
    p.feed(data)
    p.close()
    return u.close(), u.getmethodname()



#
# MOD
#
class CXMLRPCServer(CUnTracedThreadingMixIn, SimpleXMLRPCServer.SimpleXMLRPCServer):
    if os.name == POSIX:
        allow_reuse_address = True
    else:
        allow_reuse_address = False
    
    """
    Modification of Python 2.3 SimpleXMLRPCServer.SimpleXMLRPCDispatcher 
    that uses my_xmlrpclib_loads(). Needed to prevent deadlocks.
    """

    def __marshaled_dispatch(self, data, dispatch_method = None):
        params, method = my_xmlrpclib_loads(data)

        # generate response
        try:
            if dispatch_method is not None:
                response = dispatch_method(method, params)
            else:
                response = self._dispatch(method, params)
            # wrap response in a singleton tuple
            response = (response,)
            response = xmlrpclib.dumps(response, methodresponse=1)
        except xmlrpclib.Fault:
            fault = sys.exc_info()[1]
            response = xmlrpclib.dumps(fault)
        except:
            # report exception back to server
            response = xmlrpclib.dumps(
                xmlrpclib.Fault(1, "%s:%s" % (sys.exc_type, sys.exc_value))
                )
            print_debug_exception()

        return response

    if sys.version_info[:2] <= (2, 3):
        _marshaled_dispatch = __marshaled_dispatch


    #def server_activate(self):
    #    self.socket.listen(1)


    def handle_error(self, request, client_address):
        print_debug("handle_error() in pid %d" % _getpid())

        if g_ignore_broken_pipe + 5 > time.time():
            return

        return SimpleXMLRPCServer.SimpleXMLRPCServer.handle_error(self, request, client_address)



class CPwdServerProxy:
    """
    Encrypted proxy to the debuggee.
    Works by wrapping a xmlrpclib.ServerProxy object.
    """
    
    def __init__(self, crypto, uri, transport = None, target_rid = 0):
        self.m_crypto = crypto       
        self.m_proxy = xmlrpclib.ServerProxy(uri, transport)

        self.m_fEncryption = is_encryption_supported()
        self.m_target_rid = target_rid

        self.m_method = getattr(self.m_proxy, DISPACHER_METHOD)

 
    def __set_encryption(self, fEncryption):
        self.m_fEncryption = fEncryption


    def get_encryption(self):
        return self.m_fEncryption


    def __request(self, name, params):
        """
        Call debuggee method 'name' with parameters 'params'.
        """
    
        while True:
            try:
                #
                # Encrypt method and params.
                #
                fencrypt = self.get_encryption()
                args = (as_unicode(name), params, self.m_target_rid)
                (fcompress, digest, msg) = self.m_crypto.do_crypto(args, fencrypt)

                rpdb_version = as_unicode(get_interface_compatibility_version())

                r = self.m_method(rpdb_version, fencrypt, fcompress, digest, msg)
                (fencrypt, fcompress, digest, msg) = r
                
                #
                # Decrypt response.
                #
                ((max_index, _r, _e), id) = self.m_crypto.undo_crypto(fencrypt, fcompress, digest, msg, fVerifyIndex = False)
                
                if _e is not None:
                    raise _e

            except AuthenticationBadIndex:
                e = sys.exc_info()[1]
                self.m_crypto.set_index(e.m_max_index, e.m_anchor)
                continue

            except xmlrpclib.Fault:
                fault = sys.exc_info()[1] 
                if class_name(BadVersion) in fault.faultString:
                    s = fault.faultString.split("'")
                    version = ['', s[1]][len(s) > 0]
                    raise BadVersion(version)
                    
                if class_name(EncryptionExpected) in fault.faultString:
                    raise EncryptionExpected
                    
                elif class_name(EncryptionNotSupported) in fault.faultString:
                    if self.m_crypto.m_fAllowUnencrypted:
                        self.__set_encryption(False)
                        continue
                        
                    raise EncryptionNotSupported
                    
                elif class_name(DecryptionFailure) in fault.faultString:
                    raise DecryptionFailure
                    
                elif class_name(AuthenticationBadData) in fault.faultString:
                    raise AuthenticationBadData
                    
                elif class_name(AuthenticationFailure) in fault.faultString:
                    raise AuthenticationFailure
                    
                else:
                    print_debug_exception()
                    assert False 

            except xmlrpclib.ProtocolError:
                print_debug("Caught ProtocolError for %s" % name)
                #print_debug_exception()
                raise CConnectionException
                
            return _r


    def __getattr__(self, name):
        return xmlrpclib._Method(self.__request, name)


    
class CIOServer:
    """
    Base class for debuggee server.
    """
    
    def __init__(self, _rpdb2_pwd, fAllowUnencrypted, fAllowRemote, rid):
        assert(is_unicode(_rpdb2_pwd))
        assert(is_unicode(rid))

        self.m_thread = None

        self.m_crypto = CCrypto(_rpdb2_pwd, fAllowUnencrypted, rid)
        
        self.m_fAllowRemote = fAllowRemote
        self.m_rid = rid
        
        self.m_port = None
        self.m_stop = False
        self.m_server = None

        self.m_work_queue = None
        

    def shutdown(self):
        self.stop()
        
    
    def start(self):
        self.m_thread = CThread(name = 'ioserver', target = self.run, shutdown = self.shutdown)
        thread_set_daemon(self.m_thread, True)
        self.m_thread.start()


    def jumpstart(self):
        self.m_stop = False
        self.start()


    def stop(self):
        if self.m_stop:
            return
        
        print_debug('Stopping IO server... (pid = %d)' % _getpid())

        self.m_stop = True

        while thread_is_alive(self.m_thread):
            try:
                proxy = CPwdServerProxy(self.m_crypto, calcURL(LOOPBACK, self.m_port), CLocalTimeoutTransport())
                proxy.null()
            except (socket.error, CException):
                pass
            
            self.m_thread.join(0.5)

        self.m_thread = None

        self.m_work_queue.shutdown()

        #try:
        #    self.m_server.socket.close()
        #except:
        #    pass

        print_debug('Stopping IO server, done.')

        
    def export_null(self):
        return 0


    def run(self):
        if self.m_server == None:
            (self.m_port, self.m_server) = self.__StartXMLRPCServer()
       
        self.m_work_queue = CWorkQueue()
        self.m_server.register_function(self.dispatcher_method)        
        
        while not self.m_stop:
            self.m_server.handle_request()
            
        
    def dispatcher_method(self, rpdb_version, fencrypt, fcompress, digest, msg):
        """
        Process RPC call.
        """
        
        #print_debug('dispatcher_method() called with: %s, %s, %s, %s' % (rpdb_version, fencrypt, digest, msg[:100]))

        if rpdb_version != as_unicode(get_interface_compatibility_version()):
            raise BadVersion(as_unicode(get_version()))

        try:
            try:
                #
                # Decrypt parameters.
                #
                ((name, __params, target_rid), client_id) = self.m_crypto.undo_crypto(fencrypt, fcompress, digest, msg)
                
            except AuthenticationBadIndex:
                e = sys.exc_info()[1]
                #print_debug_exception()

                #
                # Notify the caller on the expected index.
                #
                max_index = self.m_crypto.get_max_index()
                args = (max_index, None, e)
                (fcompress, digest, msg) = self.m_crypto.do_crypto(args, fencrypt)
                return (fencrypt, fcompress, digest, msg)
                
            r = None
            e = None

            try:
                #
                # We are forcing the 'export_' prefix on methods that are
                # callable through XML-RPC to prevent potential security
                # problems
                #
                func = getattr(self, 'export_' + name)
            except AttributeError:
                raise Exception('method "%s" is not supported' % ('export_' + name))

            try:
                if (target_rid != 0) and (target_rid != self.m_rid):
                    raise NotAttached
                
                #
                # Record that client id is still attached. 
                #
                self.record_client_heartbeat(client_id, name, __params)

                r = func(*__params)

            except Exception:
                _e = sys.exc_info()[1]
                print_debug_exception()
                e = _e            

            #
            # Send the encrypted result.
            #
            max_index = self.m_crypto.get_max_index()
            args = (max_index, r, e)
            (fcompress, digest, msg) = self.m_crypto.do_crypto(args, fencrypt)
            return (fencrypt, fcompress, digest, msg)

        except:
            print_debug_exception()
            raise


    def __StartXMLRPCServer(self):
        """
        As the name says, start the XML RPC server.
        Looks for an available tcp port to listen on.
        """
        
        host = [LOOPBACK, ""][self.m_fAllowRemote]
        port = SERVER_PORT_RANGE_START

        while True:
            try:
                server = CXMLRPCServer((host, port), logRequests = 0)
                return (port, server)
                
            except socket.error:
                e = sys.exc_info()[1]
                if GetSocketError(e) != errno.EADDRINUSE:
                    raise
                    
                if port >= SERVER_PORT_RANGE_START + SERVER_PORT_RANGE_LENGTH - 1:
                    raise

                port += 1
                continue


    def record_client_heartbeat(self, id, name, params):
        pass



class CServerInfo(object):
    def __init__(self, age, port, pid, filename, rid, state, fembedded):
        assert(is_unicode(rid))

        self.m_age = age 
        self.m_port = port
        self.m_pid = pid
        self.m_filename = as_unicode(filename, sys.getfilesystemencoding())
        self.m_module_name = as_unicode(CalcModuleName(filename), sys.getfilesystemencoding())
        self.m_rid = rid
        self.m_state = as_unicode(state)
        self.m_fembedded = fembedded


    def __reduce__(self):
        rv = (copy_reg.__newobj__, (type(self), ), vars(self), None, None)
        return rv


    def __str__(self):
        return 'age: %d, port: %d, pid: %d, filename: %s, rid: %s' % (self.m_age, self.m_port, self.m_pid, self.m_filename, self.m_rid)


        
class CDebuggeeServer(CIOServer):
    """
    The debuggee XML RPC server class.
    """
    
    def __init__(self, filename, debugger, _rpdb2_pwd, fAllowUnencrypted, fAllowRemote, rid = None):
        if rid is None:
            rid = generate_rid()
        
        assert(is_unicode(_rpdb2_pwd))
        assert(is_unicode(rid))

        CIOServer.__init__(self, _rpdb2_pwd, fAllowUnencrypted, fAllowRemote, rid)
        
        self.m_filename = filename
        self.m_pid = _getpid()
        self.m_time = time.time()
        self.m_debugger = debugger
        self.m_rid = rid

                
    def shutdown(self):
        CIOServer.shutdown(self)

        
    def record_client_heartbeat(self, id, name, params):
        finit = (name == 'request_break')
        fdetach = (name == 'request_go' and True in params)

        self.m_debugger.record_client_heartbeat(id, finit, fdetach)

        
    def export_null(self):
        return self.m_debugger.send_event_null()


    def export_server_info(self):
        age = time.time() - self.m_time
        state = self.m_debugger.get_state()
        fembedded = self.m_debugger.is_embedded()
        
        si = CServerInfo(age, self.m_port, self.m_pid, self.m_filename, self.m_rid, state, fembedded)
        return si


    def export_sync_with_events(self, fException, fSendUnhandled):
        ei = self.m_debugger.sync_with_events(fException, fSendUnhandled)
        return ei


    def export_wait_for_event(self, timeout, event_index):
        (new_event_index, s) = self.m_debugger.wait_for_event(timeout, event_index)
        return (new_event_index, s)

                
    def export_set_breakpoint(self, filename, scope, lineno, fEnabled, expr, frame_index, fException, encoding):
        self.m_debugger.set_breakpoint(filename, scope, lineno, fEnabled, expr, frame_index, fException, encoding)
        return 0

        
    def export_disable_breakpoint(self, id_list, fAll):
        self.m_debugger.disable_breakpoint(id_list, fAll)
        return 0

        
    def export_enable_breakpoint(self, id_list, fAll):
        self.m_debugger.enable_breakpoint(id_list, fAll)
        return 0

        
    def export_delete_breakpoint(self, id_list, fAll):
        self.m_debugger.delete_breakpoint(id_list, fAll)
        return 0

        
    def export_get_breakpoints(self):
        bpl = self.m_debugger.get_breakpoints()
        return bpl

        
    def export_request_break(self):
        self.m_debugger.request_break()
        return 0


    def export_request_go(self, fdetach = False):
        self.m_debugger.request_go()
        return 0


    def export_request_go_breakpoint(self, filename, scope, lineno, frame_index, fException):
        self.m_debugger.request_go_breakpoint(filename, scope, lineno, frame_index, fException)
        return 0


    def export_request_step(self):
        self.m_debugger.request_step()
        return 0


    def export_request_next(self):
        self.m_debugger.request_next()
        return 0


    def export_request_return(self):
        self.m_debugger.request_return()
        return 0


    def export_request_jump(self, lineno):
        self.m_debugger.request_jump(lineno)
        return 0


    def export_get_stack(self, tid_list, fAll, fException):
        r = self.m_debugger.get_stack(tid_list, fAll, fException)                 
        return r
    

    def export_get_source_file(self, filename, lineno, nlines, frame_index, fException): 
        r = self.m_debugger.get_source_file(filename, lineno, nlines, frame_index, fException)
        return r


    def export_get_source_lines(self, nlines, fAll, frame_index, fException): 
        r = self.m_debugger.get_source_lines(nlines, fAll, frame_index, fException)
        return r

        
    def export_get_thread_list(self):
        r = self.m_debugger.get_thread_list()
        return r


    def export_set_thread(self, tid):
        self.m_debugger.set_thread(tid)   
        return 0


    def export_get_namespace(self, nl, filter_level, frame_index, fException, repr_limit, encoding, fraw):
        r = self.m_debugger.get_namespace(nl, filter_level, frame_index, fException, repr_limit, encoding, fraw)
        return r

        
    def export_evaluate(self, expr, frame_index, fException, encoding, fraw):
        (v, w, e) = self.m_debugger.evaluate(expr, frame_index, fException, encoding, fraw)
        return (v, w, e)

        
    def export_execute(self, suite, frame_index, fException, encoding):
        (w, e) = self.m_debugger.execute(suite, frame_index, fException, encoding)
        return (w, e)

        
    def export_stop_debuggee(self):
        self.m_debugger.stop_debuggee()
        return 0

    
    def export_set_synchronicity(self, fsynchronicity):
        self.m_debugger.set_synchronicity(fsynchronicity)
        return 0


    def export_set_trap_unhandled_exceptions(self, ftrap):
        self.m_debugger.set_trap_unhandled_exceptions(ftrap)
        return 0


    def export_is_unhandled_exception(self):
        return self.m_debugger.is_unhandled_exception()


    def export_set_fork_mode(self, ffork_into_child, ffork_auto):
        self.m_debugger.set_fork_mode(ffork_into_child, ffork_auto)
        return 0


    def export_set_environ(self, envmap):
        self.m_debugger.set_environ(envmap)
        return 0


    def export_embedded_sync(self):
        self.m_debugger.embedded_sync()
        return 0


        
#
# ------------------------------------- RPC Client --------------------------------------------
#



if not is_py3k():
    #
    # MOD
    #
    class CTimeoutHTTPConnection(httplib.HTTPConnection):
        """
        Modification of httplib.HTTPConnection with timeout for sockets.
        """

        _rpdb2_timeout = PING_TIMEOUT
        
        def connect(self):
            """Connect to the host and port specified in __init__."""
            msg = "getaddrinfo returns an empty list"
            for res in socket.getaddrinfo(self.host, self.port, 0,
                                          socket.SOCK_STREAM):
                af, socktype, proto, canonname, sa = res
                try:
                    self.sock = socket.socket(af, socktype, proto)
                    self.sock.settimeout(self._rpdb2_timeout)
                    if self.debuglevel > 0:
                        print_debug("connect: (%s, %s)" % (self.host, self.port))
                    self.sock.connect(sa)
                except socket.error:
                    msg = sys.exc_info()[1]
                    if self.debuglevel > 0:
                        print_debug('connect fail: ' + repr((self.host, self.port)))
                    if self.sock:
                        self.sock.close()
                    self.sock = None
                    continue
                break
            if not self.sock:
                raise socket.error(msg)



    #
    # MOD
    #
    class CLocalTimeoutHTTPConnection(CTimeoutHTTPConnection):
        """
        Modification of httplib.HTTPConnection with timeout for sockets.
        """

        _rpdb2_timeout = LOCAL_TIMEOUT



    #
    # MOD
    #
    class CTimeoutHTTP(httplib.HTTP):
        """
        Modification of httplib.HTTP with timeout for sockets.
        """
        
        _connection_class = CTimeoutHTTPConnection

        
            
    #
    # MOD
    #
    class CLocalTimeoutHTTP(httplib.HTTP):
        """
        Modification of httplib.HTTP with timeout for sockets.
        """
        
        _connection_class = CLocalTimeoutHTTPConnection

    
        
    #
    # MOD
    #
    class CTimeoutTransport(xmlrpclib.Transport):
        """
        Modification of xmlrpclib.Transport with timeout for sockets.
        """
        
        def make_connection(self, host):
            # create a HTTP connection object from a host descriptor
            host, extra_headers, x509 = self.get_host_info(host)
            return CTimeoutHTTP(host)

        
        
    #
    # MOD
    #
    class CLocalTimeoutTransport(xmlrpclib.Transport):
        """
        Modification of xmlrpclib.Transport with timeout for sockets.
        """
        
        def make_connection(self, host):
            # create a HTTP connection object from a host descriptor
            host, extra_headers, x509 = self.get_host_info(host)
            return CLocalTimeoutHTTP(host)

else:
    #
    # MOD
    #
    class CTimeoutTransport(xmlrpclib.Transport):
        """
        Modification of xmlrpclib.Transport with timeout for sockets.
        """
        
        def send_request(self, host, handler, request_body, debug):
            host, extra_headers, x509 = self.get_host_info(host)
            connection = httplib.HTTPConnection(host, timeout = PING_TIMEOUT)
            if debug:
                connection.set_debuglevel(1)
            headers = {}
            if extra_headers:
                for key, val in extra_headers:
                    header[key] = val
            headers["Content-Type"] = "text/xml"
            headers["User-Agent"] = self.user_agent
            connection.request("POST", handler, request_body, headers)
            return connection

        
        
    #
    # MOD
    #
    class CLocalTimeoutTransport(xmlrpclib.Transport):
        """
        Modification of xmlrpclib.Transport with timeout for sockets.
        """
        
        def send_request(self, host, handler, request_body, debug):
            host, extra_headers, x509 = self.get_host_info(host)
            connection = httplib.HTTPConnection(host, timeout = LOCAL_TIMEOUT)
            if debug:
                connection.set_debuglevel(1)
            headers = {}
            if extra_headers:
                for key, val in extra_headers:
                    header[key] = val
            headers["Content-Type"] = "text/xml"
            headers["User-Agent"] = self.user_agent
            connection.request("POST", handler, request_body, headers)
            return connection


    
#
# MOD
#
class CLocalTransport(xmlrpclib.Transport):
    """
    Modification of xmlrpclib.Transport to work around Zonealarm sockets
    bug.
    """
    
    def __parse_response(self, file, sock):
        # read response from input file/socket, and parse it

        p, u = self.getparser()

        while 1:
            if sock:
                response = sock.recv(1024)
            else:
                time.sleep(0.002)
                response = file.read(1024)
            if not response:
                break
            if self.verbose:
                _print("body: " + repr(response))
            p.feed(response)

        file.close()
        p.close()

        return u.close()

    if os.name == 'nt':
        _parse_response = __parse_response


    
class CSession:
    """
    Basic class that communicates with the debuggee server.
    """
    
    def __init__(self, host, port, _rpdb2_pwd, fAllowUnencrypted, rid):
        self.m_crypto = CCrypto(_rpdb2_pwd, fAllowUnencrypted, rid)

        self.m_host = host
        self.m_port = port
        self.m_proxy = None
        self.m_server_info = None
        self.m_exc_info = None

        self.m_fShutDown = False
        self.m_fRestart = False


    def get_encryption(self):
        return self.m_proxy.get_encryption()

        
    def getServerInfo(self):
        return self.m_server_info


    def pause(self):
        self.m_fRestart = True


    def restart(self, sleep = 0, timeout = 10):
        self.m_fRestart = True

        time.sleep(sleep)

        t0 = time.time()

        try:
            try:
                while time.time() < t0 + timeout:
                    try:
                        self.Connect()
                        return

                    except socket.error:
                        continue

                raise CConnectionException

            except:
                self.m_fShutDown = True
                raise

        finally:
            self.m_fRestart = False


    def shut_down(self):
        self.m_fShutDown = True

        
    def getProxy(self):
        """
        Return the proxy object.
        With this object you can invoke methods on the server.
        """
        
        while self.m_fRestart:
            time.sleep(0.1)

        if self.m_fShutDown:
            raise NotAttached
        
        return self.m_proxy


    def ConnectAsync(self):
        t = threading.Thread(target = self.ConnectNoThrow)
        #thread_set_daemon(t, True)
        t.start()
        return t


    def ConnectNoThrow(self):
        try:
            self.Connect()
        except:
            self.m_exc_info = sys.exc_info() 


    def Connect(self):
        host = self.m_host
        if host.lower() == LOCALHOST:
            host = LOOPBACK
        
        server = CPwdServerProxy(self.m_crypto, calcURL(host, self.m_port), CTimeoutTransport())
        server_info = server.server_info()

        self.m_proxy = CPwdServerProxy(self.m_crypto, calcURL(host, self.m_port), CLocalTransport(), target_rid = server_info.m_rid)
        self.m_server_info = server_info

                
    def isConnected(self):
        return self.m_proxy is not None

    

class CServerList:
    def __init__(self, host):
        self.m_host = host
        self.m_list = []
        self.m_errors = {}


    def calcList(self, _rpdb2_pwd, rid, key = None):
        sil = []
        sessions = []
        self.m_errors = {}

        port = SERVER_PORT_RANGE_START
        while port < SERVER_PORT_RANGE_START + SERVER_PORT_RANGE_LENGTH:
            s = CSession(self.m_host, port, _rpdb2_pwd, fAllowUnencrypted = True, rid = rid)
            t = s.ConnectAsync()
            sessions.append((s, t))
            port += 1

        for (s, t) in sessions:
            t.join()

            if (s.m_exc_info is not None):
                if not issubclass(s.m_exc_info[0], socket.error):
                    self.m_errors.setdefault(s.m_exc_info[0], []).append(s.m_exc_info)

                continue

            si = s.getServerInfo()
            if si is not None:
                sil.append((-si.m_age, si))
        
            sil.sort()
            self.m_list = [s[1] for s in sil]

            if key != None:
                try:
                    return self.findServers(key)[0]
                except:
                    pass

        if key != None:
            raise UnknownServer

        sil.sort()
        self.m_list = [s[1] for s in sil]
        
        return self.m_list 


    def get_errors(self):
        return self.m_errors


    def findServers(self, key):
        try:
            n = int(key)
            _s = [s for s in self.m_list if (s.m_pid == n) or (s.m_rid == key)]

        except ValueError:
            key = as_string(key, sys.getfilesystemencoding())
            _s = [s for s in self.m_list if key in s.m_filename]

        if _s == []:
            raise UnknownServer

        return _s    



class CSessionManagerInternal:
    def __init__(self, _rpdb2_pwd, fAllowUnencrypted, fAllowRemote, host):
        self.m_rpdb2_pwd = [_rpdb2_pwd, None][_rpdb2_pwd in [None, '']]
        self.m_fAllowUnencrypted = fAllowUnencrypted
        self.m_fAllowRemote = fAllowRemote
        self.m_rid = generate_rid()
        
        self.m_host = host
        self.m_server_list_object = CServerList(host)

        self.m_session = None
        self.m_server_info = None
        
        self.m_worker_thread = None
        self.m_worker_thread_ident = None
        self.m_fStop = False

        self.m_stack_depth = None
        self.m_stack_depth_exception = None
        self.m_frame_index = 0
        self.m_frame_index_exception = 0

        self.m_completions = {}

        self.m_remote_event_index = 0
        self.m_event_dispatcher_proxy = CEventDispatcher()
        self.m_event_dispatcher = CEventDispatcher(self.m_event_dispatcher_proxy)
        self.m_state_manager = CStateManager(STATE_DETACHED, self.m_event_dispatcher, self.m_event_dispatcher_proxy)

        self.m_breakpoints_proxy = CBreakPointsManagerProxy(self)
        
        event_type_dict = {CEventState: {EVENT_EXCLUDE: [STATE_BROKEN, STATE_ANALYZE]}}
        self.register_callback(self.reset_frame_indexes, event_type_dict, fSingleUse = False)

        event_type_dict = {CEventStackDepth: {}}
        self.register_callback(self.set_stack_depth, event_type_dict, fSingleUse = False)

        event_type_dict = {CEventNoThreads: {}}
        self.register_callback(self._reset_frame_indexes, event_type_dict, fSingleUse = False)

        event_type_dict = {CEventExit: {}}
        self.register_callback(self.on_event_exit, event_type_dict, fSingleUse = False)

        event_type_dict = {CEventConflictingModules: {}}
        self.register_callback(self.on_event_conflicting_modules, event_type_dict, fSingleUse = False)
        
        event_type_dict = {CEventSignalIntercepted: {}}
        self.register_callback(self.on_event_signal_intercept, event_type_dict, fSingleUse = False)
        
        event_type_dict = {CEventSignalException: {}}
        self.register_callback(self.on_event_signal_exception, event_type_dict, fSingleUse = False)

        event_type_dict = {CEventEmbeddedSync: {}}
        self.register_callback(self.on_event_embedded_sync, event_type_dict, fSingleUse = False)
        
        event_type_dict = {CEventSynchronicity: {}}
        self.m_event_dispatcher_proxy.register_callback(self.on_event_synchronicity, event_type_dict, fSingleUse = False)
        self.m_event_dispatcher.register_chain_override(event_type_dict)
        
        event_type_dict = {CEventTrap: {}}
        self.m_event_dispatcher_proxy.register_callback(self.on_event_trap, event_type_dict, fSingleUse = False)
        self.m_event_dispatcher.register_chain_override(event_type_dict)

        event_type_dict = {CEventForkMode: {}}
        self.m_event_dispatcher_proxy.register_callback(self.on_event_fork_mode, event_type_dict, fSingleUse = False)
        self.m_event_dispatcher.register_chain_override(event_type_dict)

        self.m_printer = self.__nul_printer

        self.m_last_command_line = None
        self.m_last_fchdir = None

        self.m_fsynchronicity = True
        self.m_ftrap = True

        self.m_ffork_into_child = False
        self.m_ffork_auto = False

        self.m_environment = []

        self.m_encoding = ENCODING_AUTO
        self.m_fraw = False
        
    
    def shutdown(self):
        self.m_event_dispatcher_proxy.shutdown()
        self.m_event_dispatcher.shutdown()
        self.m_state_manager.shutdown()

        
    def __nul_printer(self, _str):
        pass

        
    def set_printer(self, printer):
        self.m_printer = printer


    def register_callback(self, callback, event_type_dict, fSingleUse):
        return self.m_event_dispatcher.register_callback(callback, event_type_dict, fSingleUse)

        
    def remove_callback(self, callback):
        return self.m_event_dispatcher.remove_callback(callback)


    def __wait_for_debuggee(self, rid):
        try:
            time.sleep(STARTUP_TIMEOUT / 2)

            for i in range(STARTUP_RETRIES):
                try:
                    print_debug('Scanning for debuggee...')

                    t0 = time.time()
                    return self.m_server_list_object.calcList(self.m_rpdb2_pwd, self.m_rid, rid)
                
                except UnknownServer:
                    dt = time.time() - t0
                    if dt < STARTUP_TIMEOUT:
                        time.sleep(STARTUP_TIMEOUT - dt)

                    continue
                    
            return self.m_server_list_object.calcList(self.m_rpdb2_pwd, self.m_rid, rid)

        finally:
            errors = self.m_server_list_object.get_errors()
            self.__report_server_errors(errors, fsupress_pwd_warning = True)
                        

    def get_encryption(self):
        return self.getSession().get_encryption()

    
    def launch(self, fchdir, command_line, fload_breakpoints = True):
        assert(is_unicode(command_line))

        self.__verify_unattached()

        if not os.name in [POSIX, 'nt']:
            self.m_printer(STR_SPAWN_UNSUPPORTED)
            raise SpawnUnsupported
        
        if g_fFirewallTest:
            firewall_test = CFirewallTest(self.get_remote())
            if not firewall_test.run():
                raise FirewallBlock
        else:
            print_debug('Skipping firewall test.')

        if self.m_rpdb2_pwd is None:
            self.set_random_password()
            
        if command_line == '':
            raise BadArgument

        (path, filename, args) = split_command_line_path_filename_args(command_line)

        #if not IsPythonSourceFile(filename):
        #    raise NotPythonSource

        _filename = my_os_path_join(path, filename) 
           
        ExpandedFilename = FindFile(_filename)
        self.set_host(LOCALHOST)

        self.m_printer(STR_STARTUP_SPAWN_NOTICE)

        rid = generate_rid()

        create_pwd_file(rid, self.m_rpdb2_pwd)
        
        self.m_state_manager.set_state(STATE_SPAWNING)

        try:
            try:
                self._spawn_server(fchdir, ExpandedFilename, args, rid)            
                server = self.__wait_for_debuggee(rid)
                self.attach(server.m_rid, server.m_filename, fsupress_pwd_warning = True, fsetenv = True, ffirewall_test = False, server = server, fload_breakpoints = fload_breakpoints)

                self.m_last_command_line = command_line
                self.m_last_fchdir = fchdir
                
            except:
                if self.m_state_manager.get_state() != STATE_DETACHED:
                    self.m_state_manager.set_state(STATE_DETACHED)

                raise

        finally:
            delete_pwd_file(rid)


    def restart(self):
        """
        Restart debug session with same command_line and fchdir arguments
        which were used in last launch.
        """

        if None in (self.m_last_fchdir, self.m_last_command_line):
            return

        if self.m_state_manager.get_state() != STATE_DETACHED:
            self.stop_debuggee()

        self.launch(self.m_last_fchdir, self.m_last_command_line)


    def get_launch_args(self):    
        """
        Return command_line and fchdir arguments which were used in last 
        launch as (last_fchdir, last_command_line).
        Returns None if there is no info.
        """

        if None in (self.m_last_fchdir, self.m_last_command_line):
            return (None, None)
            
        return (self.m_last_fchdir, self.m_last_command_line)


    def _spawn_server(self, fchdir, ExpandedFilename, args, rid):
        """
        Start an OS console to act as server.
        What it does is to start rpdb again in a new console in server only mode.
        """

        if g_fScreen:
            name = SCREEN
        elif sys.platform == DARWIN:
            name = DARWIN
        else:
            try:
                import terminalcommand
                name = MAC
            except:
                name = os.name

        if name == 'nt' and g_fDebug:
            name = NT_DEBUG
        
        e = ['', ' --encrypt'][not self.m_fAllowUnencrypted]
        r = ['', ' --remote'][self.m_fAllowRemote]
        c = ['', ' --chdir'][fchdir]
        p = ['', ' --pwd="%s"' % self.m_rpdb2_pwd][os.name == 'nt']
       
        b = ''

        encoding = detect_locale()
        fse = sys.getfilesystemencoding()

        ExpandedFilename = g_found_unicode_files.get(ExpandedFilename, ExpandedFilename)
        ExpandedFilename = as_unicode(ExpandedFilename, fse)

        if as_bytes('?') in as_bytes(ExpandedFilename, encoding, fstrict = False):
            _u = as_bytes(ExpandedFilename)
            _b = base64.encodestring(_u)
            _b = _b.strip(as_bytes('\n')).translate(g_safe_base64_to)
            _b = as_string(_b, fstrict = True)
            b = ' --base64=%s' % _b

        debugger = os.path.abspath(__file__)
        if debugger[-1:] == 'c':
            debugger = debugger[:-1]

        debugger = as_unicode(debugger, fse)

        debug_prints = ['', ' --debug'][g_fDebug]    
            
        options = '"%s"%s --debugee%s%s%s%s%s --rid=%s "%s" %s' % (debugger, debug_prints, p, e, r, c, b, rid, ExpandedFilename, args)

        python_exec = sys.executable
        if python_exec.endswith('w.exe'):
            python_exec = python_exec[:-5] + '.exe'

        python_exec = as_unicode(python_exec, fse)

        if as_bytes('?') in as_bytes(python_exec + debugger, encoding, fstrict = False):
            raise BadMBCSPath

        if name == POSIX:
            shell = CalcUserShell()
            terminal_command = CalcTerminalCommand()

            if terminal_command in osSpawn:
                command = osSpawn[terminal_command] % {'shell': shell, 'exec': python_exec, 'options': options}
            else:    
                command = osSpawn[name] % {'term': terminal_command, 'shell': shell, 'exec': python_exec, 'options': options}
        else:    
            command = osSpawn[name] % {'exec': python_exec, 'options': options}

        if name == DARWIN:
            s = 'cd "%s" ; %s' % (getcwdu(), command)
            command = CalcMacTerminalCommand(s)

        print_debug('Terminal open string: %s' % repr(command))

        command = as_string(command, encoding)
        
        if name == MAC:
            terminalcommand.run(command)
        else:
            subprocess.Popen(command, shell=True)

    
    def attach(self, key, name = None, fsupress_pwd_warning = False, fsetenv = False, ffirewall_test = True, server = None, fload_breakpoints = True):
        assert(is_unicode(key))

        self.__verify_unattached()

        if key == '':
            raise BadArgument

        if self.m_rpdb2_pwd is None:
            #self.m_printer(STR_PASSWORD_MUST_BE_SET)
            raise UnsetPassword
       
        if g_fFirewallTest and ffirewall_test:
            firewall_test = CFirewallTest(self.get_remote())
            if not firewall_test.run():
                raise FirewallBlock
        elif not g_fFirewallTest and ffirewall_test:
            print_debug('Skipping firewall test.')

        if name is None:
            name = key

        _name = name
        
        self.m_printer(STR_STARTUP_NOTICE)
        self.m_state_manager.set_state(STATE_ATTACHING)

        try:
            servers = [server]
            if server == None:
                self.m_server_list_object.calcList(self.m_rpdb2_pwd, self.m_rid)                
                servers = self.m_server_list_object.findServers(key)
                server = servers[0] 

            _name = server.m_filename
            
            errors = self.m_server_list_object.get_errors()
            if not key in [server.m_rid, str(server.m_pid)]:
                self.__report_server_errors(errors, fsupress_pwd_warning)

            self.__attach(server, fsetenv)
            if len(servers) > 1:
                self.m_printer(STR_MULTIPLE_DEBUGGEES % key)
            self.m_printer(STR_ATTACH_CRYPTO_MODE % ([' ' + STR_ATTACH_CRYPTO_MODE_NOT, ''][self.get_encryption()]))    
            self.m_printer(STR_ATTACH_SUCCEEDED % server.m_filename)

            try:
                if fload_breakpoints:
                    self.load_breakpoints()
            except:
                pass

        except (socket.error, CConnectionException):
            self.m_printer(STR_ATTACH_FAILED_NAME % _name)
            self.m_state_manager.set_state(STATE_DETACHED)
            raise
            
        except:
            print_debug_exception()
            assert False


    def report_exception(self, _type, value, tb):
        msg = g_error_mapping.get(_type, STR_ERROR_OTHER)
        
        if _type == SpawnUnsupported and os.name == POSIX and not g_fScreen and g_fDefaultStd:
            msg += ' ' + STR_SPAWN_UNSUPPORTED_SCREEN_SUFFIX

        if _type == UnknownServer and os.name == POSIX and not g_fScreen and g_fDefaultStd:
            msg += ' ' + STR_DISPLAY_ERROR

        _str = msg % {'type': _type, 'value': value, 'traceback': tb}        
        self.m_printer(_str)

        if not _type in g_error_mapping:
            print_exception(_type, value, tb, True)
        
            
    def __report_server_errors(self, errors, fsupress_pwd_warning = False):
        for k, el in errors.items():
            if fsupress_pwd_warning and k in [BadVersion, AuthenticationBadData, AuthenticationFailure]:
                continue

            if k in [BadVersion]:
                for (t, v, tb) in el: 
                    self.report_exception(t, v, None)
                continue

            (t, v, tb) = el[0]
            self.report_exception(t, v, tb)    

        
    def __attach(self, server, fsetenv):
        self.__verify_unattached()

        session = CSession(self.m_host, server.m_port, self.m_rpdb2_pwd, self.m_fAllowUnencrypted, self.m_rid)
        session.Connect()

        if (session.getServerInfo().m_pid != server.m_pid) or (session.getServerInfo().m_filename != server.m_filename):
            raise UnexpectedData

        self.m_session = session
        
        self.m_server_info = self.get_server_info()

        self.getSession().getProxy().set_synchronicity(self.m_fsynchronicity)
        self.getSession().getProxy().set_trap_unhandled_exceptions(self.m_ftrap)
        self.getSession().getProxy().set_fork_mode(self.m_ffork_into_child, self.m_ffork_auto)

        if fsetenv and len(self.m_environment) != 0:
            self.getSession().getProxy().set_environ(self.m_environment)

        self.request_break()
        self.refresh(True)
        
        self.__start_event_monitor()
        
        print_debug('Attached to debuggee on port %d.' % session.m_port)

        #self.enable_breakpoint([], fAll = True)

        
    def __verify_unattached(self):
        if self.__is_attached():
            raise AlreadyAttached

            
    def __verify_attached(self):
        if not self.__is_attached():
            raise NotAttached


    def __is_attached(self):
        return (self.m_state_manager.get_state() != STATE_DETACHED) and (self.m_session is not None)

            
    def __verify_broken(self):
        if self.m_state_manager.get_state() not in [STATE_BROKEN, STATE_ANALYZE]:
            raise DebuggerNotBroken

    
    def refresh(self, fSendUnhandled = False):
        fAnalyzeMode = (self.m_state_manager.get_state() == STATE_ANALYZE) 

        self.m_remote_event_index = self.getSession().getProxy().sync_with_events(fAnalyzeMode, fSendUnhandled)
        self.m_breakpoints_proxy.sync()

        
    def __start_event_monitor(self):        
        self.m_fStop = False
        self.m_worker_thread = threading.Thread(target = self.__event_monitor_proc)
        #thread_set_daemon(self.m_worker_thread, True)
        self.m_worker_thread.start()

        
    def __event_monitor_proc(self):
        self.m_worker_thread_ident = thread.get_ident()
        t = 0
        nfailures = 0
        
        while not self.m_fStop:
            try:
                t = ControlRate(t, IDLE_MAX_RATE)
                if self.m_fStop:
                    return
                
                (n, sel) = self.getSession().getProxy().wait_for_event(PING_TIMEOUT, self.m_remote_event_index)
                
                if True in [isinstance(e, CEventForkSwitch) for e in sel]:
                    print_debug('Received fork switch event.')
                    
                    self.getSession().pause()
                    threading.Thread(target = self.restart_session_job).start()
                                
                if True in [isinstance(e, CEventExecSwitch) for e in sel]:
                    print_debug('Received exec switch event.')
                    
                    self.getSession().pause()
                    threading.Thread(target = self.restart_session_job, args = (True, )).start()
                    
                if True in [isinstance(e, CEventExit) for e in sel]:
                    self.getSession().shut_down()
                    self.m_fStop = True
                
                if n > self.m_remote_event_index:
                    #print >> sys.__stderr__, (n, sel)                      
                    self.m_remote_event_index = n
                    self.m_event_dispatcher_proxy.fire_events(sel)

                nfailures = 0
                
            except CConnectionException:
                if not self.m_fStop:
                    self.report_exception(*sys.exc_info())
                    threading.Thread(target = self.detach_job).start()

                return
                
            except socket.error:
                if nfailures < COMMUNICATION_RETRIES:
                    nfailures += 1
                    continue
                    
                if not self.m_fStop:
                    self.report_exception(*sys.exc_info())
                    threading.Thread(target = self.detach_job).start()
                
                return


    def on_event_conflicting_modules(self, event):
        s = ', '.join(event.m_modules_list)
        self.m_printer(STR_CONFLICTING_MODULES % s)


    def on_event_signal_intercept(self, event):
        if self.m_state_manager.get_state() in [STATE_ANALYZE, STATE_BROKEN]:
            self.m_printer(STR_SIGNAL_INTERCEPT % (event.m_signame, event.m_signum))


    def on_event_signal_exception(self, event):
        self.m_printer(STR_SIGNAL_EXCEPTION % (event.m_description, event.m_signame, event.m_signum))


    def on_event_embedded_sync(self, event):
        #
        # time.sleep() allows pending break requests to go through...
        #
        time.sleep(0.001)
        self.getSession().getProxy().embedded_sync()


    def on_event_exit(self, event):
        self.m_printer(STR_DEBUGGEE_TERMINATED)        
        threading.Thread(target = self.detach_job).start()

   
    def restart_session_job(self, fSendExitOnFailure = False):
        try:
            self.getSession().restart(sleep = 3)
            return

        except:
            pass

        self.m_fStop = True

        if fSendExitOnFailure:
            e = CEventExit()
            self.m_event_dispatcher_proxy.fire_event(e)
            return

        self.m_printer(STR_LOST_CONNECTION)
        self.detach_job()


    def detach_job(self):
        try:
            self.detach()
        except:
            pass            

            
    def detach(self):
        self.__verify_attached()

        try:
            self.save_breakpoints()
        except:
            print_debug_exception()
            pass

        self.m_printer(STR_ATTEMPTING_TO_DETACH)

        self.m_state_manager.set_state(STATE_DETACHING)

        self.__stop_event_monitor()

        try:
            #self.disable_breakpoint([], fAll = True)

            try:
                self.getSession().getProxy().set_trap_unhandled_exceptions(False)
                self.request_go(fdetach = True)

            except DebuggerNotBroken:
                pass

        finally:
            self.m_state_manager.set_state(STATE_DETACHED)
            self.m_session = None
            self.m_printer(STR_DETACH_SUCCEEDED)


    def __stop_event_monitor(self):
        self.m_fStop = True
        if self.m_worker_thread is not None:
            if thread.get_ident() != self.m_worker_thread_ident:
                try:
                    self.getSession().getProxy().null()
                except:
                    pass

                self.m_worker_thread.join()

            self.m_worker_thread = None
            self.m_worker_thread_ident = None

        
    def request_break(self):
        self.getSession().getProxy().request_break()

    
    def request_go(self, fdetach = False):
        self.getSession().getProxy().request_go(fdetach)

    
    def request_go_breakpoint(self, filename, scope, lineno):
        frame_index = self.get_frame_index()
        fAnalyzeMode = (self.m_state_manager.get_state() == STATE_ANALYZE) 

        self.getSession().getProxy().request_go_breakpoint(filename, scope, lineno, frame_index, fAnalyzeMode)


    def request_step(self):
        self.getSession().getProxy().request_step()


    def request_next(self):
        self.getSession().getProxy().request_next()


    def request_return(self):
        self.getSession().getProxy().request_return()


    def request_jump(self, lineno):
        self.getSession().getProxy().request_jump(lineno)

    
    def set_breakpoint(self, filename, scope, lineno, fEnabled, expr, encoding = None):
        frame_index = self.get_frame_index()
        fAnalyzeMode = (self.m_state_manager.get_state() == STATE_ANALYZE) 

        if encoding == None:
            encoding = self.m_encoding

        self.getSession().getProxy().set_breakpoint(filename, scope, lineno, fEnabled, expr, frame_index, fAnalyzeMode, encoding)

        
    def disable_breakpoint(self, id_list, fAll):
        self.getSession().getProxy().disable_breakpoint(id_list, fAll)

    
    def enable_breakpoint(self, id_list, fAll):
        self.getSession().getProxy().enable_breakpoint(id_list, fAll)

    
    def delete_breakpoint(self, id_list, fAll):
        self.getSession().getProxy().delete_breakpoint(id_list, fAll)

    
    def get_breakpoints(self):
        self.__verify_attached()

        bpl = self.m_breakpoints_proxy.get_breakpoints()            
        return bpl

        
    def save_breakpoints(self, filename = ''):
        self.__verify_attached()

        module_name = self.getSession().getServerInfo().m_module_name
        if module_name[:1] == '<':
            return

        if sys.platform == 'OpenVMS':
            #
            # OpenVMS filesystem does not support byte stream.
            #
            mode = 'w'
        else:
            mode = 'wb'

        path = calc_bpl_filename(module_name + filename)            
        file = open(path, mode)

        try:
            try:
                bpl = self.get_breakpoints()
                sbpl = pickle.dumps(bpl)
                file.write(sbpl)

            except:
                print_debug_exception()
                raise CException

        finally:
            file.close()


    def load_breakpoints(self, filename = ''):
        self.__verify_attached()

        module_name = self.getSession().getServerInfo().m_module_name
        if module_name[:1] == '<':
            return

        if sys.platform == 'OpenVMS':
            #
            # OpenVMS filesystem does not support byte stream.
            #
            mode = 'r'
        else:
            mode = 'rb'

        path = calc_bpl_filename(module_name + filename)                            
        file = open(path, mode)

        ferror = False
        
        try:
            try:
                bpl = pickle.load(file)
                self.delete_breakpoint([], True)

            except:
                print_debug_exception()
                raise CException

            #
            # No Breakpoints were found in file.
            #
            if filename == '' and len(bpl.values()) == 0:
                raise IOError
                
            for bp in bpl.values():
                try:
                    if bp.m_scope_fqn != None:
                        bp.m_scope_fqn = as_unicode(bp.m_scope_fqn)

                    if bp.m_filename != None:
                        bp.m_filename = as_unicode(bp.m_filename)

                    if bp.m_expr != None:
                        bp.m_expr = as_unicode(bp.m_expr)

                    if bp.m_expr in [None, '']:
                        bp.m_encoding = as_unicode('utf-8')

                    self.set_breakpoint(bp.m_filename, bp.m_scope_fqn, bp.m_scope_offset, bp.m_fEnabled, bp.m_expr, bp.m_encoding)
                except:
                    print_debug_exception()
                    ferror = True

            if ferror:
                raise CException
                
        finally:
            file.close()


    def on_event_synchronicity(self, event):
        ffire = self.m_fsynchronicity != event.m_fsynchronicity
        self.m_fsynchronicity = event.m_fsynchronicity

        if ffire:
            event = CEventSynchronicity(event.m_fsynchronicity)
            self.m_event_dispatcher.fire_event(event)


    def set_synchronicity(self, fsynchronicity):
        self.m_fsynchronicity = fsynchronicity

        if self.__is_attached():
            try:
                self.getSession().getProxy().set_synchronicity(fsynchronicity)
            except NotAttached:
                pass

        event = CEventSynchronicity(fsynchronicity)
        self.m_event_dispatcher.fire_event(event)

    
    def get_synchronicity(self):
        return self.m_fsynchronicity


    def on_event_trap(self, event):
        ffire = self.m_ftrap != event.m_ftrap
        self.m_ftrap = event.m_ftrap

        if ffire:
            event = CEventTrap(event.m_ftrap)
            self.m_event_dispatcher.fire_event(event)
        
        
    def set_trap_unhandled_exceptions(self, ftrap):
        self.m_ftrap = ftrap

        if self.__is_attached():
            try:
                self.getSession().getProxy().set_trap_unhandled_exceptions(self.m_ftrap)
            except NotAttached:
                pass

        event = CEventTrap(ftrap)
        self.m_event_dispatcher.fire_event(event)

    
    def get_trap_unhandled_exceptions(self):
        return self.m_ftrap


    def is_unhandled_exception(self):
        self.__verify_attached()

        return self.getSession().getProxy().is_unhandled_exception()


    def on_event_fork_mode(self, event):
        ffire = ((self.m_ffork_into_child , self.m_ffork_auto) != 
            (event.m_ffork_into_child, event.m_ffork_auto))

        self.m_ffork_into_child = event.m_ffork_into_child
        self.m_ffork_auto = event.m_ffork_auto

        if ffire:
            event = CEventForkMode(self.m_ffork_into_child, self.m_ffork_auto)
            self.m_event_dispatcher.fire_event(event)
       

    def set_fork_mode(self, ffork_into_child, ffork_auto):
        self.m_ffork_into_child = ffork_into_child
        self.m_ffork_auto = ffork_auto

        if self.__is_attached():
            try:
                self.getSession().getProxy().set_fork_mode(
                    self.m_ffork_into_child,
                    self.m_ffork_auto
                    )

            except NotAttached:
                pass

        event = CEventForkMode(ffork_into_child, ffork_auto)
        self.m_event_dispatcher.fire_event(event)

    
    def get_fork_mode(self):
        return (self.m_ffork_into_child, self.m_ffork_auto)
    

    def get_stack(self, tid_list, fAll):    
        fAnalyzeMode = (self.m_state_manager.get_state() == STATE_ANALYZE) 
        r = self.getSession().getProxy().get_stack(tid_list, fAll, fAnalyzeMode)
        return r


    def get_source_file(self, filename, lineno, nlines):
        assert(is_unicode(filename))

        frame_index = self.get_frame_index()
        fAnalyzeMode = (self.m_state_manager.get_state() == STATE_ANALYZE) 

        r = self.getSession().getProxy().get_source_file(filename, lineno, nlines, frame_index, fAnalyzeMode)
        return r        


    def get_source_lines(self, nlines, fAll): 
        frame_index = self.get_frame_index()
        fAnalyzeMode = (self.m_state_manager.get_state() == STATE_ANALYZE) 

        r = self.getSession().getProxy().get_source_lines(nlines, fAll, frame_index, fAnalyzeMode)
        return r

        
    def get_thread_list(self):
        (current_thread_id, thread_list) = self.getSession().getProxy().get_thread_list()
        return (current_thread_id, thread_list)

        
    def set_thread(self, tid):
        self.reset_frame_indexes(None)
        self.getSession().getProxy().set_thread(tid)

        
    def get_namespace(self, nl, filter_level, repr_limit):
        frame_index = self.get_frame_index()
        fAnalyzeMode = (self.m_state_manager.get_state() == STATE_ANALYZE) 

        r = self.getSession().getProxy().get_namespace(nl, filter_level, frame_index, fAnalyzeMode, repr_limit, self.m_encoding, self.m_fraw)
        return r


    def evaluate(self, expr, fclear_completions = True):
        assert(is_unicode(expr))

        self.__verify_attached()
        self.__verify_broken()

        frame_index = self.get_frame_index()
        fAnalyzeMode = (self.m_state_manager.get_state() == STATE_ANALYZE) 

        (value, warning, error) = self.getSession().getProxy().evaluate(expr, frame_index, fAnalyzeMode, self.m_encoding, self.m_fraw)
        
        if fclear_completions:
            self.m_completions.clear()

        return (value, warning, error)

        
    def execute(self, suite):
        assert(is_unicode(suite))

        self.__verify_attached()
        self.__verify_broken()

        frame_index = self.get_frame_index()
        fAnalyzeMode = (self.m_state_manager.get_state() == STATE_ANALYZE)

        (warning, error) = self.getSession().getProxy().execute(suite, frame_index, fAnalyzeMode, self.m_encoding)

        self.m_completions.clear()

        return (warning, error)


    def set_encoding(self, encoding, fraw):
        if (self.m_encoding, self.m_fraw) == (encoding, fraw):
            return

        self.m_encoding = encoding
        self.m_fraw = fraw
        
        event = CEventEncoding(encoding, fraw)
        self.m_event_dispatcher.fire_event(event)

        if self.__is_attached():
            self.refresh()


    def get_encoding(self):
        return (self.m_encoding, self.m_fraw)


    def set_host(self, host):
        self.__verify_unattached()

        try:
            if not is_unicode(host):
                host = host.decode('ascii')

            host.encode('ascii')

        except:
            raise BadArgument

        host = as_string(host, 'ascii') 

        try:
            socket.getaddrinfo(host, 0, 0, socket.SOCK_STREAM)

        except socket.gaierror:
            if host.lower() != LOCALHOST:
                raise

            #
            # Work-around for gaierror: (-8, 'Servname not supported for ai_socktype')
            #
            return self.set_host(LOOPBACK)
            
        self.m_host = host
        self.m_server_list_object = CServerList(host)


    def get_host(self):
        return as_unicode(self.m_host)


    def calc_server_list(self):
        if self.m_rpdb2_pwd is None:
            raise UnsetPassword
        
        if g_fFirewallTest:
            firewall_test = CFirewallTest(self.get_remote())
            if not firewall_test.run():
                raise FirewallBlock
        else:
            print_debug('Skipping firewall test.')

        server_list = self.m_server_list_object.calcList(self.m_rpdb2_pwd, self.m_rid)
        errors = self.m_server_list_object.get_errors()
        self.__report_server_errors(errors)
        
        return (server_list, errors)


    def get_server_info(self): 
        return self.getSession().getServerInfo()


    def complete_expression(self, expr):
        match = re.search(
                r'(?P<unsupported> \.)? (?P<match> ((?P<scope> (\w+\.)* \w+) \.)? (?P<complete>\w*) $)', 
                expr, 
                re.U | re.X
                )

        if match == None:
            raise BadArgument

        d = match.groupdict()

        unsupported, scope, complete = (d['unsupported'], d['scope'], d['complete'])

        if unsupported != None:
            raise BadArgument

        if scope == None:
            _scope = as_unicode('list(globals().keys()) + list(locals().keys()) + list(_RPDB2_builtins.keys())')
        else:
            _scope = as_unicode('dir(%s)' % scope)

        if not _scope in self.m_completions:
            (v, w, e) = self.evaluate(_scope, fclear_completions = False)
            if w != '' or e != '':
                print_debug('evaluate() returned the following warning/error: %s' % w + e)
                return (expr, [])

            cl = list(set(eval(v)))
            if '_RPDB2_builtins' in cl:
                cl.remove('_RPDB2_builtins')
            self.m_completions[_scope] = cl

        completions = [attr for attr in self.m_completions[_scope] if attr.startswith(complete)]
        completions.sort()

        if complete == '':
            prefix = expr
        else:
            prefix = expr[:-len(complete)]

        return (prefix, completions)



    def _reset_frame_indexes(self, event):
        self.reset_frame_indexes(None)

    
    def reset_frame_indexes(self, event):
        try:
            self.m_state_manager.acquire()
            if event is None:
                self.__verify_broken()
            elif self.m_state_manager.get_state() in [STATE_BROKEN, STATE_ANALYZE]:
                return

            self.m_stack_depth = None
            self.m_stack_depth_exception = None
            self.m_frame_index = 0
            self.m_frame_index_exception = 0

            self.m_completions.clear()

        finally:
            self.m_state_manager.release()


    def set_stack_depth(self, event):
        try:
            self.m_state_manager.acquire()
            self.__verify_broken()

            self.m_stack_depth = event.m_stack_depth
            self.m_stack_depth_exception = event.m_stack_depth_exception
            self.m_frame_index = min(self.m_frame_index, self.m_stack_depth - 1)
            self.m_frame_index_exception = min(self.m_frame_index_exception, self.m_stack_depth_exception - 1)

        finally:
            self.m_state_manager.release()

        
    def set_frame_index(self, frame_index):
        try:
            self.m_state_manager.acquire()
            self.__verify_broken()

            if (frame_index < 0) or (self.m_stack_depth is None):
                return self.get_frame_index(fLock = False)

            if self.m_state_manager.get_state() == STATE_ANALYZE:
                self.m_frame_index_exception = min(frame_index, self.m_stack_depth_exception - 1)
                si = self.m_frame_index_exception

            else:    
                self.m_frame_index = min(frame_index, self.m_stack_depth - 1)
                si = self.m_frame_index

        finally:
            self.m_state_manager.release()

        event = CEventStackFrameChange(si)
        self.m_event_dispatcher.fire_event(event)

        event = CEventNamespace()
        self.m_event_dispatcher.fire_event(event)

        return si


    def get_frame_index(self, fLock = True):
        try:
            if fLock:
                self.m_state_manager.acquire()
                
            self.__verify_attached()

            if self.m_state_manager.get_state() == STATE_ANALYZE:
                return self.m_frame_index_exception
            else:    
                return self.m_frame_index

        finally:
            if fLock:
                self.m_state_manager.release()


    def set_analyze(self, fAnalyze):
        try:
            self.m_state_manager.acquire()

            if fAnalyze and (self.m_state_manager.get_state() != STATE_BROKEN):
                raise DebuggerNotBroken
                
            if (not fAnalyze) and (self.m_state_manager.get_state() != STATE_ANALYZE):
                return
                
            state = [STATE_BROKEN, STATE_ANALYZE][fAnalyze]
            self.m_state_manager.set_state(state, fLock = False)

        finally:
            self.m_state_manager.release()

            self.refresh()

    
    def getSession(self):
        self.__verify_attached()

        return self.m_session


    def get_state(self):
        return as_unicode(self.m_state_manager.get_state())


    def set_password(self, _rpdb2_pwd):
        assert(is_unicode(_rpdb2_pwd))

        if not is_valid_pwd(_rpdb2_pwd):
            raise BadArgument

        try:
            self.m_state_manager.acquire()

            self.__verify_unattached()
            
            self.m_rpdb2_pwd = _rpdb2_pwd
        finally:
            self.m_state_manager.release()


    def set_random_password(self):
        try:
            self.m_state_manager.acquire()

            self.__verify_unattached()
            
            self.m_rpdb2_pwd = generate_random_password()
            self.m_printer(STR_RANDOM_PASSWORD)        

        finally:
            self.m_state_manager.release()

            
    def get_password(self):
        return self.m_rpdb2_pwd


    def set_remote(self, fAllowRemote):
        try:
            self.m_state_manager.acquire()

            self.__verify_unattached()
            
            self.m_fAllowRemote = fAllowRemote
        finally:
            self.m_state_manager.release()


    def get_remote(self):
        return self.m_fAllowRemote


    def set_environ(self, envmap):
        self.m_environment = []

        try:
            for k, v in envmap: 
                k = as_unicode(k, fstrict = True)
                v = as_unicode(v, fstrict = True)

                self.m_environment.append((k, v))
        
        except:
            raise BadArgument


    def get_environ(self):
        return self.m_environment


    def stop_debuggee(self):
        self.__verify_attached()

        try:
            self.save_breakpoints()
        except:
            print_debug_exception()
            pass

        self.m_printer(STR_ATTEMPTING_TO_STOP)
        self.m_printer(STR_ATTEMPTING_TO_DETACH)

        self.m_state_manager.set_state(STATE_DETACHING)

        self.__stop_event_monitor()

        try:
            self.getSession().getProxy().stop_debuggee()

        finally:
            self.m_state_manager.set_state(STATE_DETACHED)
            self.m_session = None
            self.m_printer(STR_DETACH_SUCCEEDED)



class CConsoleInternal(cmd.Cmd, threading.Thread):
    def __init__(self, session_manager, stdin = None, stdout = None, fSplit = False):
        global g_fDefaultStd

        cmd.Cmd.__init__(self, stdin = stdin, stdout = stdout)
        threading.Thread.__init__(self)
        
        self.fAnalyzeMode = False
        self.fPrintBroken = True

        self.m_filename = as_unicode('')
        
        self.m_completion_thread = None
        
        self.use_rawinput = [1, 0][fSplit]
        self.m_fSplit = fSplit
        self.prompt = [[CONSOLE_PROMPT, CONSOLE_PROMPT_ANALYZE][self.fAnalyzeMode], ""][fSplit]
        self.intro = CONSOLE_INTRO
        if fSplit:
            self.intro += '\n'
        
        #thread_set_daemon(self, True)
        
        self.m_session_manager = session_manager
        self.m_session_manager.set_printer(self.printer)

        event_type_dict = {CEventState: {}}
        self.m_session_manager.register_callback(self.event_handler, event_type_dict, fSingleUse = False)

        event_type_dict = {CEventSynchronicity: {}}
        self.m_session_manager.register_callback(self.synchronicity_handler, event_type_dict, fSingleUse = False)

        event_type_dict = {CEventTrap: {}}
        self.m_session_manager.register_callback(self.trap_handler, event_type_dict, fSingleUse = False)

        event_type_dict = {CEventForkMode: {}}
        self.m_session_manager.register_callback(self.fork_mode_handler, event_type_dict, fSingleUse = False)

        self.m_last_source_line = None
        self.m_last_nlines = DEFAULT_NUMBER_OF_LINES
        
        self.m_fAddPromptBeforeMsg = False
        self.m_eInLoop = threading.Event()
        self.cmdqueue.insert(0, '')

        self.m_stdout = self.stdout
        self.m_encoding = detect_encoding(self.stdin)

        g_fDefaultStd = (stdin == None)

        if self.use_rawinput:
            try:
                import readline
                cd = readline.get_completer_delims()
                if not '.' in cd:
                    readline.set_completer_delims(cd + '.')
            except:
                pass


    def set_filename(self, filename):
        assert(is_unicode(filename))

        self.m_filename = filename


    def precmd(self, line):
        line = as_unicode(line, self.m_encoding)

        self.m_fAddPromptBeforeMsg = True
        if not event_is_set(self.m_eInLoop):
            self.m_eInLoop.set()
            time.sleep(0.01)

        if not line.strip():
            return line
            
        command = line.split(' ', 1)[0].split(SOURCE_MORE, 1)[0].split(SOURCE_LESS, 1)[0]
        if command not in ['list', 'l']:
            self.m_last_source_line = None
            self.m_last_nlines = DEFAULT_NUMBER_OF_LINES

        return line    

            
    def postcmd(self, stop, line):
        self.m_fAddPromptBeforeMsg = False

        return stop


    def onecmd(self, line):
        """
        Default Error handling and reporting of session manager errors.
        """
        
        try:
            return cmd.Cmd.onecmd(self, line)
            
        except (socket.error, CConnectionException):
            self.m_session_manager.report_exception(*sys.exc_info())
        except CException:
            self.m_session_manager.report_exception(*sys.exc_info())
        except:
            self.m_session_manager.report_exception(*sys.exc_info())
            print_debug_exception(True)

        return False


    def default(self, line):
        """
        Called on an input line when the command prefix is not recognized.
        Over-rides base method at cmd.py.
        """

        self.printer(STR_BAD_SYNTAX % line)
       
        
    def emptyline(self):
        pass

        
    def complete(self, text, state):
        """
        Return the next possible completion for 'text'.
        If a command has not been entered, then complete against command list.
        Otherwise try to call complete_<command> to get list of completions.
        """

        if self.use_rawinput:
            #
            # Import cmd to workaround a strange bug in Python.
            #
            import cmd
            return cmd.Cmd.complete(self, text, state)

        #
        # Without rawinput assuming text includes entire buffer up to cursor.
        #

        try:
            if state != 0:
                return self.completion_matches[state]

            if not ' ' in text:
                self.completion_matches = self.completenames(text)
                return self.completion_matches[state]

            cmd, args, foo = self.parseline(text)
            if cmd == '' or not hasattr(self, 'complete_' + cmd):
                self.completion_matches = self.completedefault(text)
                return self.completion_matches[state]

            compfunc = getattr(self, 'complete_' + cmd)
            
            self.completion_matches = compfunc(text)
            return self.completion_matches[state]

        except IndexError:
            return None


    def complete_launch(self, text, line = None, begidx = None, endidx = None):
        if line != None and endidx != None:
            text = line[:endidx]

        if text.endswith(' '):
            dn, bn = '', ''
        else:
            path = text.split()[-1]
            dn, bn = os.path.split(path)

        prefix = text
        if bn != '':
            prefix = prefix[:-len(bn)]

        if dn == '' and bn.startswith('~'):
            if bn == os.path.expanduser(bn):
                c = text
            else:
                c = os.path.join(text, '')

            if begidx != None:
                c = c[begidx:]

            return [c]

        pl = [dn]
        if dn == '':
            pl += os.environ['PATH'].split(os.pathsep)

        fl = []
        for p in pl:
            if p == '':
                p = '.'

            try:
                ep = os.path.expanduser(p)
                l = os.listdir(ep)
                for f in l:
                    if not f.startswith(bn):
                        continue

                    root, ext = os.path.splitext(f)
                    if not ext in ['.py', '.pyw', '']:
                        continue

                    if os.path.isdir(os.path.join(ep, f)):
                        c = prefix + os.path.join(f, '')
                    else:
                        c = prefix + f

                    if begidx != None:
                        c = c[begidx:]

                    fl.append(c)
            except:
                pass

        fs = set(fl)
        cl = list(fs)
        cl.sort()

        return cl


    def complete_eval(self, text, line = None, begidx = None, endidx = None):
        t = self.m_completion_thread
        if t != None and thread_is_alive(t):
            return []

        self.m_completion_thread = None
        result = [('', [])]

        if line != None and endidx != None:
            text = line[:endidx]

        t = threading.Thread(target = self.complete_expression_job, args = (text, result))
        t.start()
        t.join(PING_TIMEOUT)

        if thread_is_alive(t):
            self.m_completion_thread = t
            return []

        (prefix, completions) = result[-1]

        if begidx != None:
            prefix = prefix[begidx:]

        ce = [prefix + c for c in completions]

        return ce

    complete_v = complete_eval
    complete_exec = complete_eval
    complete_x = complete_exec


    def complete_expression_job(self, text, result):
        try:
            (prefix, completions) = self.m_session_manager.complete_expression(text)
            result.append((prefix, completions))

        except:
            print_debug_exception()

        
    def run(self):
        self.cmdloop()


    def __get_str_wrap(self, _str, max_len):
        if len(_str) <= max_len and not '\n' in _str:
            return (_str, '')

        s = _str[: max_len]

        i = s.find('\n')

        if i == -1:
            i = s.rfind(' ')

        if i == -1:
            return (s, _str[max_len:])

        return (_str[: i], _str[i + 1:])    

            
    def printer(self, _str):
        if not event_is_set(self.m_eInLoop):
            self.m_eInLoop.wait()

        fAPBM = self.m_fAddPromptBeforeMsg    
        prefix = ['', self.prompt.strip('\n')][fAPBM] + CONSOLE_PRINTER
        suffix = '\n' + [self.prompt.strip('\n'), ''][fAPBM]

        s = _str
        while s != '':
            s, _s = self.__get_str_wrap(s, CONSOLE_WRAP_INDEX - len(prefix + suffix))
            _print(prefix + s + suffix, self.m_stdout, feol = False)
            s = _s 

        self.m_stdout.flush()
        

    def print_notice(self, notice):
        nl = notice.split('\n')

        i = 0
        for l in nl:
            _print(l, self.m_stdout)
            i += 1
            if i % PRINT_NOTICE_LINES_PER_SECTION == 0:
                _print("\n" + PRINT_NOTICE_PROMPT, self.m_stdout, feol = False)
                response = self.stdin.readline()
                if response != '\n':
                    break

                _print('', self.m_stdout)

        
    def event_handler(self, event): 
        state = event.m_state
        if (state == STATE_BROKEN) and self.fPrintBroken:
            self.fPrintBroken = False
            self.printer(STR_DEBUGGER_HAS_BROKEN)
            return

        if (state != STATE_ANALYZE) and self.fAnalyzeMode:
            self.fAnalyzeMode = False
            self.prompt = [CONSOLE_PROMPT, ""][self.m_fSplit]
            self.printer(STR_ANALYZE_MODE_TOGGLE % MODE_OFF)
            return
        
        if (state == STATE_ANALYZE) and not self.fAnalyzeMode:
            self.fAnalyzeMode = True
            self.prompt = [CONSOLE_PROMPT_ANALYZE, ""][self.m_fSplit]
            self.printer(STR_ANALYZE_MODE_TOGGLE % MODE_ON)
            return


    def synchronicity_handler(self, event):
        self.printer(STR_SYNCHRONICITY_MODE % str(event.m_fsynchronicity))


    def trap_handler(self, event):
        self.printer(STR_TRAP_MODE_SET % str(event.m_ftrap))

        
    def fork_mode_handler(self, event):
        x = [FORK_PARENT, FORK_CHILD][event.m_ffork_into_child]
        y = [FORK_MANUAL, FORK_AUTO][event.m_ffork_auto]

        self.printer(STR_FORK_MODE_SET % (x, y))

        
    def do_launch(self, arg):
        if arg == '':
            self.printer(STR_BAD_ARGUMENT)
            return

        if arg[:2] == '-k':
            fchdir = False
            _arg = arg[2:].strip()
        else:
            fchdir = True
            _arg = arg

        self.fPrintBroken = True

        try:
            self.m_session_manager.launch(fchdir, _arg)
            return
            
        except BadArgument:
            self.printer(STR_BAD_ARGUMENT)            
        except IOError:
            self.printer(STR_FILE_NOT_FOUND % arg)
        except:
            self.fPrintBroken = False
            raise
                    
        self.fPrintBroken = False


    def do_restart(self, arg):
        if arg != '':
            self.printer(STR_BAD_ARGUMENT)
            return
            
        try:
            self.m_session_manager.restart()
            return
            
        except BadArgument:
            self.printer(STR_BAD_ARGUMENT)
        except IOError:
            self.printer(STR_FILE_NOT_FOUND % arg)
        except:
            self.fPrintBroken = False
            raise

        self.fPrintBroken = False

    
    def do_attach(self, arg):
        if arg == '':
            return self.__scripts(arg)
            
        self.fPrintBroken = True

        try:
            self.m_session_manager.attach(arg)
            return
            
        except BadArgument:
            self.printer(STR_BAD_ARGUMENT)
        except:
            self.fPrintBroken = False
            raise

        self.fPrintBroken = False


    def __scripts(self, arg):
        if self.m_session_manager.get_password() is None:
            _print(STR_PASSWORD_MUST_BE_SET, self.m_stdout)
            return

        host = self.m_session_manager.get_host()
        _print(STR_SCRIPTS_CONNECTING % host, self.m_stdout)

        (server_list, errors) = self.m_session_manager.calc_server_list()

        if server_list == []:
            _print(STR_SCRIPTS_NO_SCRIPTS % host, self.m_stdout)
            return

        try:
            spid = self.m_session_manager.get_server_info().m_pid
        except NotAttached:
            spid = None

        _print(STR_SCRIPTS_TO_DEBUG % host, self.m_stdout)    
        for s in server_list:
            m = ['', SYMBOL_MARKER][spid == s.m_pid]
            _print(' %1s %-5d  %s' % (m, s.m_pid, s.m_filename), self.m_stdout)


    def do_detach(self, arg):
        if not arg == '':
            self.printer(STR_BAD_ARGUMENT)
            return

        self.m_session_manager.detach()


    def do_host(self, arg):
        if arg == '':
            host = self.m_session_manager.get_host()
            _print(host, self.m_stdout)
            return

        try:
            self.m_session_manager.set_host(arg)

        except socket.gaierror:
            e = sys.exc_info()[1]
            self.printer(MSG_ERROR_HOST_TEXT % (arg, e))

        
    def do_break(self, arg):
        if arg != '':
            self.printer(STR_BAD_ARGUMENT)
            return
            
        self.m_session_manager.request_break()

    do_b = do_break

    
    def __parse_bp_arg(self, arg, fAllowExpr = True):
        _args = arg.split(BP_EVAL_SEP)

        if (len(_args) > 1) and (not fAllowExpr):
            raise BadArgument
            
        if len(_args) > 1:
            expr = _args[1].strip()
        else:
            expr = ''

        rf = _args[0].rfind(BP_FILENAME_SEP)
        if rf == -1:
            args = [_args[0]]
        else:
            args = [_args[0][:rf], _args[0][rf + 1:]]

        filename = ['', args[0]][len(args) > 1]

        if filename in [None, '']:
            filename = self.m_filename

        try:
            lineno = int(args[-1])
            scope = ''
        except ValueError:
            lineno = 0
            scope = args[-1].strip()

        return (filename, scope, lineno, expr)

    
    def do_go(self, arg):
        if self.fAnalyzeMode:
            self.printer(STR_ILEGAL_ANALYZE_MODE_CMD)
            return

        try:
            if arg != '':
                (filename, scope, lineno, expr) = self.__parse_bp_arg(arg, fAllowExpr = False)
                self.fPrintBroken = True
                self.m_session_manager.request_go_breakpoint(filename, scope, lineno)
                return
            
            self.fPrintBroken = True
            self.m_session_manager.request_go()
            return

        except BadArgument:    
            self.printer(STR_BAD_ARGUMENT)
        except IOError:
            self.printer(STR_FILE_NOT_FOUND % filename)
        except InvalidScopeName:
            self.printer(STR_SCOPE_NOT_FOUND % scope)
        except DebuggerNotBroken:
            self.m_session_manager.report_exception(*sys.exc_info())
        except:
            self.fPrintBroken = False
            raise

        self.fPrintBroken = False

    do_g = do_go


    def do_step(self, arg):
        if arg != '':
            self.printer(STR_BAD_ARGUMENT)
            return
            
        if self.fAnalyzeMode:
            self.printer(STR_ILEGAL_ANALYZE_MODE_CMD)
            return

        try:
            self.m_session_manager.request_step()

        except DebuggerNotBroken:
            self.m_session_manager.report_exception(*sys.exc_info())

    do_s = do_step


    def do_next(self, arg):
        if arg != '':
            self.printer(STR_BAD_ARGUMENT)
            return
            
        if self.fAnalyzeMode:
            self.printer(STR_ILEGAL_ANALYZE_MODE_CMD)
            return

        try:
            self.m_session_manager.request_next()

        except DebuggerNotBroken:
            self.m_session_manager.report_exception(*sys.exc_info())

    do_n = do_next

    
    def do_return(self, arg):
        if arg != '':
            self.printer(STR_BAD_ARGUMENT)
            return
            
        if self.fAnalyzeMode:
            self.printer(STR_ILEGAL_ANALYZE_MODE_CMD)
            return

        try:
            self.m_session_manager.request_return()

        except DebuggerNotBroken:
            self.m_session_manager.report_exception(*sys.exc_info())

    do_r = do_return

    
    def do_jump(self, arg):
        try:
            lineno = int(arg)
        except ValueError:
            self.printer(STR_BAD_ARGUMENT)
            return

        try:
            self.m_session_manager.request_jump(lineno)

        except DebuggerNotBroken:
            self.m_session_manager.report_exception(*sys.exc_info())

    do_j = do_jump

    
    def do_bp(self, arg):
        if arg == '':
            self.printer(STR_BAD_ARGUMENT)
            return
        
        try:
            (filename, scope, lineno, expr) = self.__parse_bp_arg(arg, fAllowExpr = True)
            self.m_session_manager.set_breakpoint(filename, scope, lineno, True, expr)

        except BadArgument:    
            self.printer(STR_BAD_ARGUMENT)
        except IOError:
            self.printer(STR_FILE_NOT_FOUND % filename)
        except InvalidScopeName:
            self.printer(STR_SCOPE_NOT_FOUND % scope)
        except SyntaxError:
            self.printer(STR_BAD_EXPRESSION % expr)
        except DebuggerNotBroken:
            self.m_session_manager.report_exception(*sys.exc_info())


    def do_be(self, arg):
        if arg == '':
            self.printer(STR_BAD_ARGUMENT)
            return
            
        try:
            id_list = []
            fAll = (arg == SYMBOL_ALL)
            
            if not fAll:
                sid_list = arg.split()
                id_list = [int(sid) for sid in sid_list]

            self.m_session_manager.enable_breakpoint(id_list, fAll)

        except ValueError:
            self.printer(STR_BAD_ARGUMENT)


    def do_bd(self, arg):
        if arg == '':
            self.printer(STR_BAD_ARGUMENT)
            return
            
        try:
            id_list = []
            fAll = (arg == SYMBOL_ALL)
            
            if not fAll:
                sid_list = arg.split()
                id_list = [int(sid) for sid in sid_list]

            self.m_session_manager.disable_breakpoint(id_list, fAll)

        except ValueError:
            self.printer(STR_BAD_ARGUMENT)


    def do_bc(self, arg):
        if arg == '':
            self.printer(STR_BAD_ARGUMENT)
            return
            
        try:
            id_list = []
            fAll = (arg == SYMBOL_ALL)
            
            if not fAll:
                sid_list = arg.split()
                id_list = [int(sid) for sid in sid_list]

            self.m_session_manager.delete_breakpoint(id_list, fAll)

        except ValueError:
            self.printer(STR_BAD_ARGUMENT)


    def do_bl(self, arg):
        bpl = self.m_session_manager.get_breakpoints()
            
        bplk = list(bpl.keys())
        bplk.sort()
        
        _print(STR_BREAKPOINTS_LIST, self.m_stdout)    
        for id in bplk:
            bp = bpl[id]

            if bp.m_expr:
                expr = bp.m_expr
            else:
                expr = ''
            
            try:
                expr.encode('ascii', 'strict')
                encoding = ''
            except:
                encoding = bp.m_encoding

            scope = bp.m_scope_fqn

            if scope.startswith(MODULE_SCOPE + '.'):
                scope = scope[len(MODULE_SCOPE) + 1:]

            elif scope.startswith(MODULE_SCOPE2 + '.'):
                scope = scope[len(MODULE_SCOPE2) + 1:]   
                
            state = [STATE_DISABLED, STATE_ENABLED][bp.isEnabled()]
            s = STR_BREAKPOINTS_TEMPLATE % (id, state, bp.m_lineno, clip_filename(bp.m_filename, 45), calc_suffix(scope, 45), calc_prefix(expr, 50), encoding)
            _print(s.rstrip() + '\n', self.m_stdout)
            

    def do_save(self, arg):
        self.m_session_manager.save_breakpoints(arg)
        _print(STR_BREAKPOINTS_SAVED, self.m_stdout)    
        return
            
        
    def do_load(self, arg):
        try:
            self.m_session_manager.load_breakpoints(arg)
            _print(STR_BREAKPOINTS_LOADED, self.m_stdout)    
            return

        except IOError:
            error = [STR_BREAKPOINTS_FILE_NOT_FOUND, STR_BREAKPOINTS_NOT_FOUND][arg == '']
            self.printer(error)


    def do_stack(self, arg):
        if self.fAnalyzeMode and (arg != ''):
            self.printer(STR_ILEGAL_ANALYZE_MODE_ARG)
            return

        try:
            tid_list = []
            fAll = (arg == SYMBOL_ALL)
            
            if not fAll:
                sid_list = arg.split()
                tid_list = [int(sid) for sid in sid_list]
                
            sl = self.m_session_manager.get_stack(tid_list, fAll)

            if len(sl) == 0:
                self.printer(STR_NO_THREADS_FOUND)
                return

            frame_index = self.m_session_manager.get_frame_index()

            m = None    
            for st in sl:
                s = st.get(DICT_KEY_STACK, [])
                tid = st.get(DICT_KEY_TID, 0)
                fBroken = st.get(DICT_KEY_BROKEN, False)
                fCurrent = st.get(DICT_KEY_CURRENT_TID, False)

                if m is not None:
                    _print('', self.m_stdout)
                    
                _print(STR_STACK_TRACE % tid, self.m_stdout)    
                i = 0
                while i < len(s):
                    e = s[-(1 + i)]

                    marker = [SOURCE_STATE_UNBROKEN, SYMBOL_MARKER][fBroken]
                    
                    if fCurrent:
                        m = ['', marker][i == frame_index]
                    else:
                        m = ['', marker][i == 0]
                        
                    _print(' %1s %5d  %-28s  %4d  %s' % (m, i, calc_suffix(e[0], 28), e[1], calc_prefix(e[2], 20)), self.m_stdout)
                    i += 1
                    
        except ValueError:
            self.printer(STR_BAD_ARGUMENT)
        except (NoExceptionFound, NoThreads):
            self.m_session_manager.report_exception(*sys.exc_info())

    do_k = do_stack

    
    def do_list(self, arg):
        rf = arg.rfind(BP_FILENAME_SEP)
        if rf == -1:
            _filename = ''
            __args2 = arg
        else:
            _filename = arg[:rf]
            __args2 = arg[rf + 1:]
            
        _args = __args2.split(BP_EVAL_SEP)
        
        fAll = (_args[0] == SYMBOL_ALL)
        fMore = (_args[0] == SOURCE_MORE)
        fLess = (_args[0] == SOURCE_LESS)
        fEntire = (_args[0] == SOURCE_ENTIRE_FILE)
        fCurrent = (_args[0] == '')
        fLine = False
        l = 1
        
        try:
            if len(_args) > 1:
                nlines = int(_args[1])
            else:
                nlines = self.m_last_nlines

            if not (fAll or fMore or fLess or fEntire or fCurrent):     
                l = int(_args[0])
                fLine = True

        except ValueError:
            self.printer(STR_BAD_ARGUMENT)
            return

        if self.fAnalyzeMode and fAll:
            self.printer(STR_ILEGAL_ANALYZE_MODE_ARG)
            return

        if fMore and self.m_last_source_line:
            l = max(1, self.m_last_source_line + self.m_last_nlines // 2 + 1)
            fLine = True
        elif fLess and self.m_last_source_line:
            l = max(1, self.m_last_source_line - (self.m_last_nlines - 1) // 2 - nlines)
            fLine = True
            
        try:
            if fEntire:
                r = [self.m_session_manager.get_source_file(_filename, -1, -1)]
            elif fLine:
                r = [self.m_session_manager.get_source_file(_filename, l, nlines)]
            elif _filename != '':
                r = [self.m_session_manager.get_source_file(_filename, l, nlines)]
            else:
                r = self.m_session_manager.get_source_lines(nlines, fAll)

            if len(r) == 0:
                self.printer(STR_NO_THREADS_FOUND)
                return

            m = None    
            for d in r:
                tid = d.get(DICT_KEY_TID, 0)
                filename = d.get(DICT_KEY_FILENAME, '')
                breakpoints = d.get(DICT_KEY_BREAKPOINTS, {})
                source_lines = d.get(DICT_KEY_LINES, [])
                first_lineno = d.get(DICT_KEY_FIRST_LINENO, 0)

                if len(r) == 1 and first_lineno != 0:
                    l = first_lineno
                    
                fBroken = d.get(DICT_KEY_BROKEN, False)
                frame_event = d.get(DICT_KEY_EVENT, '')
                frame_lineno = d.get(DICT_KEY_FRAME_LINENO, 0)
                
                if m is not None:
                    _print('', self.m_stdout)
                    
                _print(STR_SOURCE_LINES % (tid, filename), self.m_stdout)    
                for i, line in enumerate(source_lines):
                    lineno = first_lineno + i
                    if lineno != frame_lineno:
                        m = ''
                    elif not fBroken:
                        m = SOURCE_STATE_UNBROKEN + SYMBOL_MARKER
                    elif frame_event == 'call':
                        m = SOURCE_EVENT_CALL + SYMBOL_MARKER
                    elif frame_event == 'line':
                        m = SOURCE_EVENT_LINE + SYMBOL_MARKER
                    elif frame_event == 'return':
                        m = SOURCE_EVENT_RETURN + SYMBOL_MARKER
                    elif frame_event == 'exception':
                        m = SOURCE_EVENT_EXCEPTION + SYMBOL_MARKER

                    if breakpoints.get(lineno, None) == STATE_ENABLED:
                        b = SOURCE_BP_ENABLED
                    elif breakpoints.get(lineno, None) == STATE_DISABLED:
                        b = SOURCE_BP_DISABLED
                    else:
                        b = ''
                        
                    line = line.replace('\t', ' ' * PYTHON_TAB_WIDTH)

                    _print(' %2s %1s %5d  %s' % (m, b, lineno, calc_prefix(line[:-1], 60)), self.m_stdout)

            if fAll or fEntire:
                self.m_last_source_line = None        
            elif len(source_lines) != 0:
                self.m_last_source_line = [l + (nlines - 1) // 2, frame_lineno][l == -1]

            self.m_last_nlines = nlines
                
        except (InvalidFrame, IOError):
            self.printer(STR_SOURCE_NOT_FOUND)
        except (NoExceptionFound, NoThreads):
            self.m_session_manager.report_exception(*sys.exc_info())

    do_l = do_list


    def do_up(self, arg):
        if arg != '':
            self.printer(STR_BAD_ARGUMENT)
            return

        try:
            fi = self.m_session_manager.get_frame_index()
            self.m_session_manager.set_frame_index(fi - 1)
            
        except DebuggerNotBroken:
            self.m_session_manager.report_exception(*sys.exc_info())


    def do_down(self, arg):
        if arg != '':
            self.printer(STR_BAD_ARGUMENT)
            return
            
        try:
            fi = self.m_session_manager.get_frame_index()
            self.m_session_manager.set_frame_index(fi + 1)
            
        except DebuggerNotBroken:
            self.m_session_manager.report_exception(*sys.exc_info())


    def evaluate_job(self, sync_event, expr):
        try:
            (value, warning, error) = self.m_session_manager.evaluate(expr)

            if warning:
                self.printer(STR_WARNING % warning)

            if error:
                _print(error + '\n', self.m_stdout)

            _print(value, self.m_stdout)

            if event_is_set(sync_event):
                _print(self.prompt, self.m_stdout, feol = False)

            return
                
        except (NoExceptionFound, DebuggerNotBroken):
            self.m_session_manager.report_exception(*sys.exc_info())
                    
        except (socket.error, CConnectionException):
            self.m_session_manager.report_exception(*sys.exc_info())
        except CException:
            self.m_session_manager.report_exception(*sys.exc_info())
        except:
            self.m_session_manager.report_exception(*sys.exc_info())
            print_debug_exception(True)
        

    def do_eval(self, arg):
        if arg == '':
            self.printer(STR_BAD_ARGUMENT)
            return
            
        sync_event = threading.Event()
        t = threading.Thread(target = self.evaluate_job, args = (sync_event, arg))
        t.start()
        t.join(WAIT_FOR_BREAK_TIMEOUT)

        if thread_is_alive(t):
            _print(STR_OUTPUT_WARNING_ASYNC, self.m_stdout)
            sync_event.set()
                        
    do_v = do_eval

  
    def execute_job(self, sync_event, suite):
        try:
            (warning, error) = self.m_session_manager.execute(suite)

            if warning:
                self.printer(STR_WARNING % warning)

            if error:
                _print(error + '\n', self.m_stdout)

            if event_is_set(sync_event):
                _print(self.prompt, self.m_stdout, feol = False) 

            return    
                
        except (NoExceptionFound, DebuggerNotBroken):
            self.m_session_manager.report_exception(*sys.exc_info())
                    
        except (socket.error, CConnectionException):
            self.m_session_manager.report_exception(*sys.exc_info())
        except CException:
            self.m_session_manager.report_exception(*sys.exc_info())
        except:
            self.m_session_manager.report_exception(*sys.exc_info())
            print_debug_exception(True)
        

    def do_exec(self, arg):
        if arg == '':
            self.printer(STR_BAD_ARGUMENT)
            return
            
        _print(STR_OUTPUT_WARNING, self.m_stdout)

        sync_event = threading.Event()
        t = threading.Thread(target = self.execute_job, args = (sync_event, arg))
        t.start()
        t.join(WAIT_FOR_BREAK_TIMEOUT)

        if thread_is_alive(t):
            _print(STR_OUTPUT_WARNING_ASYNC, self.m_stdout)
            sync_event.set()
        
    do_x = do_exec


    def do_encoding(self, arg):
        if arg == '':
            encoding, fraw = self.m_session_manager.get_encoding()
            if encoding != ENCODING_AUTO:
                try:
                    codecs.lookup(encoding)
                except:
                    encoding += ' (?)'

            if fraw:
                encoding += ', ' + ENCODING_RAW

            _print(STR_ENCODING_MODE % encoding, self.m_stdout)
            return

        if ',' in arg:
            encoding, raw = arg.split(',')
        else:
            encoding, raw = arg, ''

        encoding = encoding.strip()
        if encoding == '':
            encoding, fraw = self.m_session_manager.get_encoding()

        fraw = 'raw' in raw

        self.m_session_manager.set_encoding(encoding, fraw)
        
        if encoding != ENCODING_AUTO:
            try:
                codecs.lookup(encoding)
            except:
                encoding += ' (?)'
                _print(STR_ENCODING_BAD, self.m_stdout)

        if fraw:
            encoding += ', ' + ENCODING_RAW

        _print(STR_ENCODING_MODE_SET % encoding, self.m_stdout)


    def do_thread(self, arg):
        if self.fAnalyzeMode and (arg != ''):
            self.printer(STR_ILEGAL_ANALYZE_MODE_ARG)
            return

        try:
            if arg != '':
                tid = int(arg)
                self.m_session_manager.set_thread(tid)

                _print(STR_THREAD_FOCUS_SET, self.m_stdout)
                return

            (current_thread_id, tl) = self.m_session_manager.get_thread_list()

            _print(STR_ACTIVE_THREADS, self.m_stdout)    
            for i, t in enumerate(tl):
                m = ['', SYMBOL_MARKER][t[DICT_KEY_TID] == current_thread_id]
                state = [STATE_RUNNING, STR_STATE_BROKEN][t[DICT_KEY_BROKEN]]
                _print(' %1s %3d  %5d  %-15s  %s' % (m, i, t[DICT_KEY_TID], t[DICT_KEY_NAME], state[:25]), self.m_stdout)
                
        except ValueError:
            self.printer(STR_BAD_ARGUMENT)
        except ThreadNotFound:
            self.printer(STR_THREAD_NOT_FOUND)
        except DebuggerNotBroken:
            self.m_session_manager.report_exception(*sys.exc_info())

    do_t = do_thread


    def do_analyze(self, arg):
        if arg != '':
            self.printer(STR_BAD_ARGUMENT)
            return

        try:
            self.m_session_manager.set_analyze(not self.fAnalyzeMode)

        except DebuggerNotBroken:
            self.m_session_manager.report_exception(*sys.exc_info())

    do_a = do_analyze

   
    def do_synchro(self, arg):
        if arg == '':
            fsynchronicity = self.m_session_manager.get_synchronicity()
            _print(STR_SYNCHRONICITY_MODE % str(fsynchronicity), self.m_stdout)
            return

        if arg == str(True):
            fsynchronicity = True
        elif arg == str(False):
            fsynchronicity = False
        else:
            _print(STR_BAD_ARGUMENT, self.m_stdout)
            return

        self.m_session_manager.set_synchronicity(fsynchronicity)

   
    def do_trap(self, arg):
        if arg == '':
            ftrap = self.m_session_manager.get_trap_unhandled_exceptions()
            _print(STR_TRAP_MODE % str(ftrap), self.m_stdout)
            return

        if arg == str(True):
            ftrap = True
        elif arg == str(False):
            ftrap = False
        else:
            _print(STR_BAD_ARGUMENT, self.m_stdout)
            return

        self.m_session_manager.set_trap_unhandled_exceptions(ftrap)

   
    def do_fork(self, arg):
        (ffork_into_child, ffork_auto) = self.m_session_manager.get_fork_mode()

        if arg == '':
            x = [FORK_PARENT, FORK_CHILD][ffork_into_child]
            y = [FORK_MANUAL, FORK_AUTO][ffork_auto]

            _print(STR_FORK_MODE % (x, y), self.m_stdout)
            return 

        arg = arg.lower()

        if FORK_PARENT in arg:
            ffork_into_child = False
        elif FORK_CHILD in arg:
            ffork_into_child = True

        if FORK_AUTO in arg:
            ffork_auto = True
        elif FORK_MANUAL in arg:
            ffork_auto = False

        self.m_session_manager.set_fork_mode(ffork_into_child, ffork_auto)


    def do_password(self, arg):
        if arg == '':
            _rpdb2_pwd = self.m_session_manager.get_password()
            if _rpdb2_pwd is None:
                _print(STR_PASSWORD_NOT_SET, self.m_stdout)
            else:    
                _print(STR_PASSWORD_SET % _rpdb2_pwd, self.m_stdout)
            return

        _rpdb2_pwd = arg.strip('"\'')
        
        try:
            self.m_session_manager.set_password(_rpdb2_pwd)
            _print(STR_PASSWORD_SET % _rpdb2_pwd, self.m_stdout)

        except BadArgument:
            _print(STR_PASSWORD_BAD, self.m_stdout)

            
    def do_remote(self, arg):
        if arg == '':
            fAllowRemote = self.m_session_manager.get_remote()
            _print(STR_REMOTE_MODE % str(fAllowRemote), self.m_stdout)
            return

        if arg == str(True):
            fAllowRemote = True
        elif arg == str(False):
            fAllowRemote = False
        else:
            _print(STR_BAD_ARGUMENT, self.m_stdout)
            return

        self.m_session_manager.set_remote(fAllowRemote)
        _print(STR_REMOTE_MODE % str(fAllowRemote), self.m_stdout)


    def do_env(self, arg):
        env = self.m_session_manager.get_environ()

        if arg == '':
            if len(env) == 0:
                _print(STR_ENVIRONMENT_EMPTY, self.m_stdout)
                return

            _print(STR_ENVIRONMENT, self.m_stdout)
            for k, v in env:
                _print('%s=%s' % (k, v), self.m_stdout)
            return

        if arg[:2] == '-d':
            k = arg[2:].strip()
            _env = [(_k, _v) for (_k, _v) in env if _k != k]
            self.m_session_manager.set_environ(_env)
            return

        try:
            k, v = arg.split('=')
            k = k.strip()
            v = v.strip()

        except ValueError:
            self.printer(STR_BAD_ARGUMENT)
            return

        _env = [(_k, _v) for (_k, _v) in env if _k != k]
        _env.append((k, v))

        self.m_session_manager.set_environ(_env)


    def do_stop(self, arg):        
        self.m_session_manager.stop_debuggee()
            
        
    def do_exit(self, arg):
        if arg != '':
            self.printer(STR_BAD_ARGUMENT)
            return

        if self.m_session_manager.get_state() != STATE_DETACHED:    
            try:
                self.do_stop('')
                
            except (socket.error, CConnectionException):
                self.m_session_manager.report_exception(*sys.exc_info())
            except CException:
                self.m_session_manager.report_exception(*sys.exc_info())
            except:
                self.m_session_manager.report_exception(*sys.exc_info())
                print_debug_exception(True)

        _print('', self.m_stdout)

        return True 

    do_EOF = do_exit    


    def do_copyright(self, arg):
        self.print_notice(COPYRIGHT_NOTICE)


    def do_license(self, arg):
        self.print_notice(LICENSE_NOTICE + COPY_OF_THE_GPL_LICENSE)


    def do_credits(self, arg):
        self.print_notice(CREDITS_NOTICE)


    def do_help(self, arg):
        cmd.Cmd.do_help(self, arg)

        if arg == '':
            help_notice = """Security:
----------------

password    - Get or set the channel password.
remote      - Get or set "allow connections from remote machines" mode.

Session Control:
-----------------

env         - Display or set the environment setting for new sessions.
host        - Display or change host.
attach      - Display scripts or attach to a script on host.
detach      - Detach from script.
launch      - Start a script and attach to it.
restart     - Restart a script.
stop        - Shutdown the debugged script.
exit        - Exit from debugger.

Debuggee Control:
-----------------

break       - Request an immediate break.
step        - Continue to the next execution line.
next        - Continue to the next execution line in the current frame.
return      - Continue until the debugger is about to return from the frame.
jump        - Jump to a line in the current scope.
go          - Continue execution.

Breakpoints Control:
--------------------

bp          - Set a break point.
bd          - Disable a breakpoint.
be          - Enable a breakpoint.
bc          - Clear (delete) a breakpoint.
bl          - List all breakpoints.
load        - Load session breakpoints.
save        - save session breakpoints.

Misc:
-----

thread      - Display threads or switch to a particular thread.
list        - List source code.
stack       - Display stack trace.
up          - Go up one frame in stack.
down        - Go down one frame in stack.
encoding    - Set the source encoding used by exec and eval commands.
eval        - Evaluate expression in the context of the current frame.
exec        - Execute suite in the context of the current frame.
analyze     - Toggle analyze last exception mode.
trap        - Get or set "trap unhandled exceptions" mode.
fork        - Get or set fork handling mode.
synchro     - Get or set synchronicity mode.

License:
----------------

copyright   - Print copyright notice.
license     - Print license.
credits     - Print credits information.


type help <topic> for futher information."""

            self.print_notice(help_notice)

        
    def help_copyright(self):
        _print("""copyright

Print copyright notice.""", self.m_stdout) 


    def help_license(self):
        _print("""license

Print license.""", self.m_stdout)    


    def help_credits(self):
        _print("""credits

Print credits information.""", self.m_stdout)  


    def help_help(self):
        _print("""help <cmd>

Print help for command <cmd>.
On the other hand I guess that you already know that, don't you?""", self.m_stdout)  


    def help_analyze(self):
        _print("""analyze

(shorthand - a)

Toggle analyze last exception mode.

The following changes to the debugger behavior apply in analyze mode:
The debugger prompt changes to 'Analyze>'.
'go', 'step', 'next', and 'return' are not allowed.
'thread' does not allow to change the thread focus.
'stack' allows no arguments.
'list' does not accept the '*' (all threads) argument
'stack', 'list', 'eval', 'exec', 'up', and 'down' operate on the thrown 
exception.""", self.m_stdout)

    help_a = help_analyze    


    def help_password(self):
        _print("""password <password>

Get or set the channel password.

Communication between the console and the debuggee is always authenticated and
optionally encrypted. The password (A secret known to the console and the
debuggee alone) governs both security methods. The password is never 
communicated between the two components on the communication channel.

A password is always required since unsecured communication between the 
console and the debuggee might expose your machine to attacks.""", self.m_stdout)


    def help_remote(self):
        _print("""remote [True | False]

Get or set "allow connections from remote machines" mode.

When set to False: 
Newly launched debuggees will listen on localhost only. In this mode, debugger
consoles on remote machines will NOT BE able to see or attach to the debuggee.

When set to True: 
Newly launched debuggees will listen on INADDR_ANY. In this mode, debugger 
consoles on remote machines will BE able to see and attach to the debuggee.""", self.m_stdout)


    def help_trap(self):
        _print("""trap [True | False]

Get or set "trap unhandled exceptions" mode.

When set to False: 
Debuggee will ignore unhandled exceptions.

When set to True: 
Debuggee will pause on unhandled exceptions for inspection.""", self.m_stdout)


    def help_synchro(self):
        _print("""synchro [True | False]

Get or set the synchronicity mode.

Traditional Python debuggers that use the inspected thread 
(usually the main thread) to query or modify the script 
name-space have to wait until the script hits a break-point. 
Synchronicity allows the debugger to query and modify the 
script name-space even if its threads are still running or 
blocked in C library code by using special worker threads. 
In some rare cases querying or modifying data in 
synchronicity can crash the script. For example in some 
Linux builds of wxPython querying the state of wx objects 
from a thread other than the GUI thread can crash the 
script. If this happens or if you want to restrict these 
operations to the inspected thread, turn synchronicity off.

Default is True.""", self.m_stdout)


    def help_fork(self):
        _print("""fork [parent | child] [manual | auto]

Get or set fork handling mode.

Without arguments returns the current mode.

When 'parent' is specified the debugger will continue to debug the original
parent process after a fork.

When 'child' is specified the debugger will switch to debug the forked 
child process after a fork.

When 'manual' is specified the debugger will pause before doing a fork.

When 'auto' is specified the debugger will go through the fork without 
pausing and will make the forking decision based on the parent/child 
setting.

WARNING:
On some Posix OS such as FreeBSD, Stepping into the child fork 
can result in termination of the child process since the debugger
uses threading for its operation and on these systems threading and 
forking can conflict.
""", self.m_stdout)


    def help_stop(self):
        _print("""stop

Shutdown the debugged script.""", self.m_stdout)


    def help_launch(self):
        _print("""launch [-k] <script_name> [<script_args>]

Start script <script_name> and attach to it.

-k  Don't change the current working directory. By default the working
    directory of the launched script is set to its folder.""", self.m_stdout)


    def help_restart(self):
        _print("""restart

Restart a script with same arguments from last launch.""", self.m_stdout)



    def help_attach(self):
        _print("""attach [<arg>]

Without an argument, 'attach' prints the scripts available for debugging
on the selected host. To select a host use the 'host' command. A script is
considered available for debugging only if it is using the rpdb2 module or
has been executed by the debugger.
If the debugger is already attached to a script, a special character will
mark that script in the list.

When <arg> is an integer the debugger will try to attach to a script with
that pid. 
When <arg> is a string the debugger will try to attach to a script
with that name in the list.""", self.m_stdout)  


    def help_detach(self):
        _print("""detach

Detach from the script the debugger is currently attached to. The detached
script will continue execution.""", self.m_stdout)  


    def help_break(self):
        _print("""break 

(shorthand - b)

Request script to break (pause execution as if it hit a breakpoint). 
The 'break' command returns immdeiately but the break is only established 
when an active thread submits to the debugger control. If a thread is 
doing a system call or executing C code, this will happen only when 
it returns to do python code.""", self.m_stdout)  

    help_b = help_break
    

    def help_bp(self):
        _print("""bp [<filename>':'] (<line> | <scope>) [',' <expr>]

Set a breakpoint.

<filename> - either the filename or the module name. 
<line>     - is the line number to assign the breakpoint to.
<scope>    - is a "fully qualified" function name. That is, not only the 
             function name but also the class name (in case of a member 
             function), such as MyClass.MyMemberFunction.
<expr>     - condition to evaluate in the context of the frame. If it
             evaluates to 'True' the break point will break into the debugger.

In case the <filemame> is omitted, the current file is assumed. In this case 
the debuggee has to be waiting at break point.

Examples:

    bp test_file.py:20
    bp test_file.py:MyClass.Foo
    bp 304

Type 'help break' for more information on breakpoints and threads.""", self.m_stdout)


    def help_be(self):
        _print("""be (<id_list> | '*')
        
Enable breakpoints.

<id_list> - is a space delimited list of at least one breakpoint id
'*' - Enable all breakpoints.""", self.m_stdout)


    def help_bd(self):
        _print("""bd (<id_list> | '*')
        
Disable breakpoints.

<id_list> - is a space delimited list of at least one breakpoint id
'*' - disable all breakpoints.""", self.m_stdout)


    def help_bc(self):
        _print("""bc (<id_list> | '*')
        
Clear (delete) breakpoints.

<id_list> - is a space delimited list of at least one breakpoint id
'*' - clear all breakpoints.""", self.m_stdout)


    def help_bl(self):
        _print("""bl

List all breakpoints, sorted by their id.""", self.m_stdout)


    def help_load(self):
        _print("""load [<filename>]
        
Load breakpoints.

<filename> - optional breakpoints filename. The filename should not include
             a file extension.""", self.m_stdout)


    def help_save(self):
        _print("""save [<filename>]
        
save breakpoints.

<filename> - optional breakpoints filename. The filename should not include
             a file extension.""", self.m_stdout)


    def help_go(self):
        _print("""go [[<filename>':'] (<line> | <scope>)]

(shorthand - g)

Resume execution of a script that is waiting at break point. 
If an argument is present, continue execution until that argument is reached.

<filename> - is the file name which basically is the script's name without
             the '.py' extension. 
<line>   - is the line number to assign the breakpoint to.
<scope>  - is a "fully qualified" function name. That is, not only the 
           function name but also the class name (in case of a member 
           function), such as MyClass.MyMemberFunction.""", self.m_stdout)

    help_g = help_go
    

    def help_exit(self):
        _print("""exit

Exit the debugger. If the debugger is attached to a script, the debugger
will attempt to detach from the script first.""", self.m_stdout) 

    help_EOF = help_exit
    

    def help_host(self):
        _print("""host [<arg>]

Without an argument, 'host' prints the current selected host.
With an argument <arg>, 'host' attempts to resolve <arg> to a known ip 
address or a domain name. If it is successful, that host will become the
selected host. 
The default selected host is the local host.
Subsequent 'attach' commands will be done on the selected host. 

Type 'help attach' for more information.""", self.m_stdout)  

    def help_stack(self):
        _print("""stack [<tid> | '*']

(shorthand - k)

Without an argument, 'stack' prints the stack trace of the focused thread.
If the thread is waiting at break point a special character will mark the 
focused frame.

<tid> - print the stack of thread <tid> 
'*'   - print the stacks of all active threads.

Type 'help break' for more information on breakpoints and threads.
Type 'help up' or 'help down' for more information on focused frames.""", self.m_stdout)  

    help_k = help_stack

    
    def help_list(self):
        _print("""list [<file_name>:][<line_no> | '+' | '-' | '^' | '*'] [',' <nlines>]

(shorthand - l)

Without an argument, 'list' prints the source lines around the current line
of the focused thread in the focused frame. A special character sequence will 
mark the current line according to the event:

    'C>' - call - A function is called.
    'L>' - line - The interpreter is about to execute a new line of code.
    'R>' - return - A function is about to return.
    'E>' - exception - An exception has been thrown.
    '*>' - running - The thread is running.

If a breakpoint is assigned to a line, that line will be marked with:

    'B' - if the breakpoint is enabled
    'D' - if the breakpoint is disabled

<file_name> - List source from filename    
<line_no>   - Print the source lines around that line number in the same file 
              of the current line.
'+'         - Print the next lines in the file.
'-'         - Print the previous lines in the file.
'^'         - Print the entire file.
'*'         - Print the source lines for each of the active threads.
<nlines>    - Print <nlines> of source

Type 'help break' for more information on breakpoints and threads.
Type 'help up' or 'help down' for more information on focused frames.""", self.m_stdout)  

    help_l = help_list
    

    def help_thread(self):
        _print("""thread [<no> | <tid>]

(shorthand - t)

Without an argument, 'thread' prints the list of known active threads, with
their corresponding state, which can be either 'running' or 
'waiting at break point'. A special character will mark the focused thread.

With an argument <tid>, 'thread' will attempt to set the debugger focus to
the thread of that tid.
With an argument <no>, 'thread' will attempt to set the debugger focus to 
the thread of that order in the thread list.

Type 'help break' for more information on breakpoints and threads.""", self.m_stdout)

    help_t = help_thread


    def help_jump(self):
        _print("""jump <lineno>

(shorthand - j)

Jump to line <lineno> in the current scope.""", self.m_stdout)

    help_j = help_jump
    

    def help_next(self):
        _print("""next

(shorthand - n)

Continue execution until the next line in the current function
is reached or it returns.""", self.m_stdout)

    help_n = help_next
    

    def help_step(self):
        _print("""step

(shorthand - s)

Execute the current line, stop at the first possible occasion
(either in a function that is called or in the current function).""", self.m_stdout)

    help_s = help_step    


    def help_return(self):
        _print("""next

(shorthand - r)

Continue execution until the current function returns.""", self.m_stdout)

    help_r = help_return    


    def help_up(self):
        _print("""up

move the debugger focus one frame up the stack of the debugged thread 
(closer to the current, most recently executed frame). Evaluation of 
expressions or execution of statements will be done at the local and global 
name spaces of the focused frame.

Type 'help eval' for more information on evaluation of expressions.
Type 'help exec' for more information on execution of statements.""", self.m_stdout)


    def help_down(self):
        _print("""down

move the debugger focus one frame down the stack of the debugged thread 
(closer to the current, most recently executed frame). Evaluation of 
expressions or execution of statements will be done at the local and global 
name spaces of the focused frame.

Type 'help eval' for more information on evaluation of expressions.
Type 'help exec' for more information on execution of statements.""", self.m_stdout)


    def help_eval(self):
        _print("""eval <expr>

(shorthand - v)

Evaluate the python expression <expr> under the global and local name spaces
of the currently focused frame.

Example:
'eval locals()' - will display the dictionary of the local variables.

IMPORTANT: Any changes to the global name space will be discarded unless the
focused stack frame is the top most frame.

Type 'help up' or 'help down' for more information on focused frames.""", self.m_stdout)  

    help_v = help_eval


    def help_exec(self):
        _print("""exec <stmt>

(shorthand - x)

Execute the python suite <stmt> under the global and local name spaces
of the currently focused frame.

Example:
'exec i += 1'

IMPORTANT: Any changes to the global name space will be discarded unless the
focused stack frame is the top most frame.

Type 'help up' or 'help down' for more information on focused frames.""", self.m_stdout)  

    help_x = help_exec


    def help_encoding(self):
        _print("""encoding [<encoding> [, raw]]

Set the source encoding for the exec and eval commands.

Without an argument returns the current encoding.

The specified encoding can be either 'auto' or any encoding accepted 
by the codecs module. If 'auto' is specified, the source encoding of 
the active scope will be used, which is utf-8 by default.

The default encoding value is 'auto'.

If 'raw' is specified, strings returned by the eval command
will represent non ASCII characters as an escape sequence.""", self.m_stdout)


    def help_env(self):
        _print("""env [-d key | key = value] 

Set the environment variables mapping. This mapping is used 
when a new script is launched to modify its environment.

Example for a mapping on Windows: 
env Path = %Path%;c:\\mydir

Example for a mapping on Linux: 
env PATH = $PATH:~/mydir

To delete the mapping for PATH
env -d PATH

Without an argument returns the current list of mappings.

Note that the mapping will be evaluated and used to modify 
the environment after the debugger engine at the debuggee
has imported the modules it requires. The order in which the
mappings will be evaluated and applied is: 
last set, last evaluated.""", self.m_stdout)  



#
# ---------------------------------------- Replacement Functions ------------------------------------
#



def rpdb2_import_wrapper(*args, **kwargs):
    if len(args) > 0:
        name = args[0]
    elif 'name' in kwargs:
        name = kwargs['name']
    else:
        return g_import(*args, **kwargs)

    if name in sys.modules:
        return g_import(*args, **kwargs)

    #
    # rpdb2 avoids stepping through this 
    # function (rpdb2_import_wrapper) to
    # prevent confusion when stepping into
    # an import statement.
    #
    m = g_import(*args, **kwargs)

    if name != 'gtk':
        return m

    try:
        m.gdk.threads_init()
        return m
    except:
        pass
    
    try:
        m.threads_init()
        return m
    except:
        pass

    return m



g_import = None

if __name__ == 'rpdb2' and g_builtins_module.__import__ != rpdb2_import_wrapper:
    g_import = g_builtins_module.__import__
    g_builtins_module.__import__ = rpdb2_import_wrapper



def __find_eval_exec_frame_in_stack():
    f = sys._getframe(0)
    
    while f != None:
        filename = f.f_code.co_filename
        name = f.f_code.co_name
        
        if DEBUGGER_FILENAME in filename and name in ['_evaluate', '_execute'] and 'redirect_exc_info' in f.f_locals:
            return f

        f = f.f_back

    return None



def __exc_info():
    f = __find_eval_exec_frame_in_stack()
    if f == None:
        return g_sys_exc_info()

    try:
        frame_index = f.f_locals['frame_index']
        fException = f.f_locals['fException']

        e = g_debugger.get_exception(frame_index, fException)
        exc_info = (e['type'], e['value'], e['traceback'])

        return exc_info

    except:
        return g_sys_exc_info()



g_sys_exc_info = None

if __name__ == 'rpdb2' and 'exc_info' in dir(sys) and sys.exc_info != __exc_info:
    g_sys_exc_info = sys.exc_info
    sys.exc_info = __exc_info



def __setrecursionlimit(rl):
    global g_recursionlimit

    print_debug('rl = %d' % rl)

    g_recursionlimit = max(rl, 64)

    rl = g_recursionlimit
    if sys.version_info[:2] == (2, 6):
        rl *= 3

    return g_sys_setrecursionlimit(rl + 64)



g_sys_setrecursionlimit = None

if __name__ == 'rpdb2' and 'setrecursionlimit' in dir(sys) and sys.setrecursionlimit != __setrecursionlimit:
    g_sys_setrecursionlimit = sys.setrecursionlimit
    sys.setrecursionlimit = __setrecursionlimit
    __setrecursionlimit(sys.getrecursionlimit())



def __find_debugger_frame():
    frame = None

    f = sys._getframe(0)
    
    while f != None:
        filename = f.f_code.co_filename
        name = f.f_code.co_name
        
        if DEBUGGER_FILENAME in filename and (name.startswith('trace_dispatch') or name == 'profile'):
            frame = f 

        f = f.f_back

    return frame



class CSignalHandler:
    def __del__(self):
        while len(g_signals_pending) != 0:
            (handler, signum, frameobj) = g_signals_pending.pop(0)
            print_debug('Handling pending signal: %s, %s' % (repr(signum), repr(frameobj)))
            
            try:
                handler(signum, frameobj)

            except:
                #
                # Can not raise from inside a destructor. Report that handler
                # exception will be ignored.
                #
                (t, v, tb) = sys.exc_info()

                _t = safe_repr(t)
                if _t.startswith("<type '"):
                    _t = _t.split("'")[1]

                event = CEventSignalException(signum, '%s: %s' % (_t, safe_repr(v)))
                g_debugger.m_event_dispatcher.fire_event(event)



def signal_handler(signum, frameobj):
    frame = __find_debugger_frame()
    if frame == None:
        #
        # A debugger tracing frame was not found in the stack.
        # This means that the handler can be run without risk
        # for state corruption.
        #
        handler = signal.getsignal(signum)
        return handler(signum, frameobj)

    if frame.f_code.co_name == 'profile' and frame.f_locals['event'] != 'return':
        #
        # signal was caught inside the profile hook but not while
        # doing some debugger stuff. Call the handler but in case
        # of exception schedule the debugger to re-enable the 
        # profile hook.
        #
        try:
            handler = signal.getsignal(signum)
            return handler(signum, frameobj)
        except:
            ctx = g_debugger.get_ctx(thread.get_ident())
            ctx.set_tracers(fsignal_exception = True)
            raise

    #
    # Set the handler to be run when the debugger is about 
    # to return from the tracing code.
    #

    print_debug('Intercepted signal: %s, %s' % (repr(signum), repr(frameobj)))

    f = frameobj
    while f != None:
        if f == frame:
            frameobj = frame.f_back
            break

        f = f.f_back

    handler = signal.getsignal(signum)
    g_signals_pending.append((handler, signum, frameobj))

    if not 'signal_handler' in frame.f_locals:
        frame.f_locals.update({'signal_handler': CSignalHandler()})

    event = CEventSignalIntercepted(signum)
    g_debugger.m_event_dispatcher.fire_event(event)

    if signum == signal.SIGINT and g_debugger.is_waiting_for_attach():
        g_debugger.set_request_go_timer(0)



def __getsignal(signum):
    handler = g_signal_handlers.get(signum, g_signal_getsignal(signum))
    return handler



g_signal_getsignal = None

if __name__ == 'rpdb2' and 'getsignal' in dir(signal) and signal.getsignal != __getsignal:
    g_signal_getsignal = signal.getsignal
    signal.getsignal = __getsignal



def __signal(signum, handler):
    old_handler = __getsignal(signum)
    
    if handler in [signal.SIG_IGN, signal.SIG_DFL]:
        g_signal_signal(signum, handler)
        return old_handler

    g_signal_signal(signum, signal_handler)
    g_signal_handlers[signum] = handler

    return old_handler



g_signal_signal = None

if __name__ == 'rpdb2' and 'signal' in dir(signal) and signal.signal != __signal:
    g_signal_signal = signal.signal
    signal.signal = __signal



"""
def __setprofile(foo):
    global g_profile

    print_debug('*** setprofile to %s' % repr(foo))
    traceback.print_stack(file = sys.__stderr__)

    if thread_get_name(current_thread()) == 'MainThread':
        g_profile = foo

    g_sys_setprofile(foo)



g_sys_setprofile = None

if __name__ == 'rpdb2' and sys.setprofile != __setprofile:
    g_sys_setprofile = sys.setprofile
    sys.setprofile = __setprofile
"""



def __fork():
    global g_forktid
    
    if not g_fignorefork:
        g_forktid = setbreak()

    #
    # os.fork() has been called. 
    #
    # You can choose if you would like the debugger
    # to continue with the parent or child fork with
    # the 'fork' console command.
    # 
    # For example: 'fork child' or 'fork parent'
    # Type: 'help fork' for more information.
    #
    # WARNING: 
    # On some Posix OS such as FreeBSD, 
    # Stepping into the child fork can result in 
    # termination of the child process.
    #
    # *** RPDB2 SAYS: Read the entire comment! ***
    #
    return g_os_fork()



g_os_fork = None

if __name__ == 'rpdb2' and 'fork' in dir(os) and os.fork != __fork:
    g_os_fork = os.fork
    os.fork = __fork



def __exit(n):
    global g_fos_exit

    if type(n) == int:
        g_fos_exit = (setbreak() != None)

    #
    # os._exit(n) has been called.
    #
    # Stepping on from this point will result 
    # in program termination.
    #
    return g_os_exit(n)



g_os_exit = None

if __name__ == 'rpdb2' and '_exit' in dir(os) and os._exit != __exit:
    g_os_exit = os._exit
    os._exit = __exit



def __close(fd):
    global g_fos_exit

    try:
        if fd == g_server.m_server.socket._sock.fileno():
            g_fos_exit = (setbreak() != None)
    except:
        pass

    #
    # os.close(fd) has been called by the debugged script to close 
    # the debugger communication channel. 
    #
    # This can normally happen if it is trying to spawn a new process
    # in its place.
    #
    # Stepping on from this point will result in termination of the
    # debugging session.
    #
    return g_os_close(fd)



g_os_close = None

if __name__ == 'rpdb2' and 'close' in dir(os) and os.close != __close:
    g_os_close = os.close
    os.close = __close



def __dup2(fd, fd2):
    global g_fos_exit

    try:
        if fd2 == g_server.m_server.socket._sock.fileno():
            g_fos_exit = (setbreak() != None)
    except:
        pass

    #
    # os.dup2(fd, fd2) has been called by the debugged script to close 
    # the debugger communication channel. 
    #
    # This can normally happen if it is trying to spawn a new process
    # in its place.
    #
    # Stepping on from this point will result in termination of the
    # debugging session.
    #
    return g_os_dup2(fd, fd2)



g_os_dup2 = None

if __name__ == 'rpdb2' and 'dup2' in dir(os) and os.dup2 != __dup2:
    g_os_dup2 = os.dup2
    os.dup2 = __dup2



def __execv(path, args):
    global g_exectid
    
    if os.path.isfile(path) and not g_fignorefork:
        g_exectid = setbreak()

    #
    # os.execv() has been called. 
    #
    # Stepping on from this point will result 
    # in termination of the debug session if
    # the exec operation completes successfully.
    #
    return g_os_execv(path, args)



g_os_execv = None

if __name__ == 'rpdb2' and 'execv' in dir(os) and os.execv != __execv:
    g_os_execv = os.execv
    os.execv = __execv



def __execve(path, args, env):
    global g_exectid

    if os.path.isfile(path) and not g_fignorefork:
        g_exectid = setbreak()

    #
    # os.execve() has been called. 
    #
    # Stepping on from this point will result 
    # in termination of the debug session if
    # the exec operation completes successfully.
    #
    return g_os_execve(path, args, env)



g_os_execve = None

if __name__ == 'rpdb2' and 'execve' in dir(os) and os.execve != __execve:
    g_os_execve = os.execve
    os.execve = __execve



def __excepthook(type, value, traceback, next_excepthook, index):
    if index + 1 < len(g_excepthooks):
        return next_excepthook(type, value, traceback)

    if traceback.tb_frame.f_back == None:
        return next_excepthook(type, value, traceback)

    if not g_debugger.m_ftrap:
        return next_excepthook(type, value, traceback)

    settrace()
    ctx = g_debugger.get_ctx(thread.get_ident())
    ctx.m_fUnhandledException = True
    setbreak()

    #
    # Debuggee breaks (pauses) here
    # on unhandled exceptions.
    # Use analyze mode for post mortem.
    # type 'help analyze' for more information.
    #
    return next_excepthook(type, value, traceback)



g_excepthooks = []

g_excepthook = None

#
# Set the debugger hook for unhandled exceptions. It only kicks in on 
# unhandled exceptions that are declared unhandled in the middle of the
# stack as in wxPython. Normally unhandled exceptions are trapped at the 
# last stack frame by another mechanism.
#
# This mechaism is designed to work even if the excepthook is over-written.
# by the debugged script.
#
def set_excepthook():
    global g_excepthook

    if len(g_excepthooks) >= 4:
        #
        # Give up. We have been over-written 4 times already.
        #
        return

    next_excepthook = sys.excepthook
    index = len(g_excepthooks)

    eh = lambda type, value, traceback: __excepthook(type, value, traceback, next_excepthook, index)

    g_excepthooks.append(eh)
    g_excepthook = eh
    sys.excepthook = eh



def __function_wrapper(function, args, kwargs):
    __settrace(depth = 1)

    #
    # Debuggee breaks (pauses) here
    # on unhandled exceptions.
    # Use analyze mode for post mortem.
    # type 'help analyze' for more information.
    #
    return function(*args, **kwargs)



def __start_new_thread(function, args, kwargs = {}):
    return g_thread_start_new_thread(__function_wrapper, (function, args, kwargs))



g_thread_start_new_thread = None

if __name__ == 'rpdb2' and 'start_new_thread' in dir(thread) and thread.start_new_thread != __start_new_thread:
    g_thread_start_new_thread = thread.start_new_thread
    thread.start_new_thread = __start_new_thread



#
# ---------------------------------------- main ------------------------------------
#



def __settrace(depth = 2):
    if g_debugger is None:
        return
        
    f = sys._getframe(depth)
    g_debugger.settrace(f, f_break_on_init = False)

    

def __setbreak(depth = 2):
    if g_debugger is None:
        return
        
    f = sys._getframe(depth)
    g_debugger.setbreak(f)

    return thread.get_ident()



def __set_temp_breakpoint(path, scopename, lineno):
    return g_debugger.m_bp_manager.set_temp_breakpoint(path, scopename, lineno)

    

def _atexit(fabort = False):
    if g_fignore_atexit:
        return

    print_debug("Entered _atexit() in pid %d" % _getpid())

    if g_debugger is None:
        return

    if not fabort:
        g_debugger.stoptrace()
        
    g_debugger.send_event_exit()

    time.sleep(1.0)

    g_server.shutdown()
    g_debugger.shutdown()

    if not fabort:
        return

    if hasattr(os, 'kill') and hasattr(signal, 'SIGKILL'):
        os.kill(os.getpid(), signal.SIGKILL)
    else:
        os.abort()
        


def my_pickle_import(*args, **kwargs):
    name = ''
    
    if len(args) > 0:
        name = args[0]

    if 'name' in kwargs:
        name = kwargs['name']

    if name == 'rpdb2':
        return

    return __import__(*args, **kwargs)



#
# MOD
#
def workaround_import_deadlock():
    if is_py3k() and hasattr(pickle, '_Pickler'):
        pickle.Pickler = pickle._Pickler

    xmlrpclib.loads(XML_DATA)
    s = as_bytes("(S'hello'\np0\nS'world'\np1\ntp2\n.")
    #s = as_bytes('(S\'\\xb3\\x95\\xf9\\x1d\\x105c\\xc6\\xe2t\\x9a\\xa5_`\\xa59\'\np0\nS"(I0\\nI1\\nS\'5657827\'\\np0\\n(S\'server_info\'\\np1\\n(tI0\\ntp2\\ntp3\\n."\np1\ntp2\n.0000000')
    pickle.loads(s)
    pickle.__import__ = my_pickle_import



def __start_embedded_debugger(_rpdb2_pwd, fAllowUnencrypted, fAllowRemote, timeout, source_provider, fDebug, depth):
    global g_server
    global g_debugger
    global g_fDebug
    global g_initial_cwd
    global g_source_provider_aux

    _rpdb2_pwd = as_unicode(_rpdb2_pwd)

    try:
        g_server_lock.acquire()
        
        if g_debugger is not None and timeout == 0:
            f = sys._getframe(depth)
            g_debugger.settrace(f, f_break_on_init = False)
            return

        if g_debugger is not None:
            f = sys._getframe(depth)
            g_debugger.record_client_heartbeat(0, True, False)
            g_debugger.setbreak(f)
            return

        if not is_valid_pwd(_rpdb2_pwd):
            raise BadArgument(STR_PASSWORD_BAD)

        g_fDebug = fDebug
        g_source_provider_aux = source_provider

        workaround_import_deadlock()

        if (not fAllowUnencrypted) and not is_encryption_supported():
            raise EncryptionNotSupported
        
        f = sys._getframe(depth)
        filename = calc_frame_path(f)

        #
        # This is an attempt to address the Python problem of recording only
        # relative paths in __file__ members of modules in the following case.
        #
        if sys.path[0] == '':
            try:
                g_initial_cwd = [getcwd(), getcwdu()]
    
            except UnicodeDecodeError:
                #
                # This exception can be raised in py3k (alpha) on nt.
                #
                g_initial_cwd = [getcwdu()]

            
        atexit.register(_atexit)
        
        g_debugger = CDebuggerEngine(fembedded = True)

        g_server = CDebuggeeServer(filename, g_debugger, _rpdb2_pwd, fAllowUnencrypted, fAllowRemote)
        g_server.start()

        if timeout == 0:
            g_debugger.settrace(f, f_break_on_init = False)
            return

        g_debugger.settrace(f, timeout = timeout)

    finally:
        g_server_lock.release()



def StartServer(args, fchdir, _rpdb2_pwd, fAllowUnencrypted, fAllowRemote, rid): 
    assert(is_unicode(_rpdb2_pwd))

    global g_server
    global g_debugger
    global g_module_main
     
    try:
        ExpandedFilename = FindFile(args[0])
        _path = g_found_unicode_files.get(ExpandedFilename, ExpandedFilename)
        
        if fchdir:   
            os.chdir(os.path.dirname(_path))

        if ExpandedFilename in g_found_unicode_files:
            prefix = os.path.join(getcwdu(), '')
            _path = _path.replace(winlower(prefix), '')
        
    except IOError:
        _print('File ' + args[0] + ' not found.')
        return

    print_debug('Starting server with: %s' % ExpandedFilename)

    workaround_import_deadlock()

    #
    # Replace the rpdb2.py directory with the script directory in 
    # the search path
    #

    spe = ExpandedFilename
    if os.path.islink(ExpandedFilename):
        spe = os.path.realpath(ExpandedFilename)

    sys.path[0] = os.path.dirname(spe)

    encoding = detect_locale()
    argv = [as_string(arg, encoding) for arg in args]
    sys.argv = argv

    atexit.register(_atexit)

    g_debugger = CDebuggerEngine()

    g_server = CDebuggeeServer(ExpandedFilename, g_debugger, _rpdb2_pwd, fAllowUnencrypted, fAllowRemote, rid)
    g_server.start()

    try:
        g_debugger.m_bp_manager.set_temp_breakpoint(ExpandedFilename, '', 1, fhard = True)
    except:
        pass

    f = sys._getframe(0)
    g_debugger.settrace(f, f_break_on_init = False, builtins_hack = ExpandedFilename)

    g_module_main = -1
    del sys.modules['__main__']

    #
    # An exception in this line occurs if
    # there is a syntax error in the debugged script or if
    # there was a problem loading the debugged script.
    #
    imp.load_source('__main__', _path)    
        


def StartClient(command_line, fAttach, fchdir, _rpdb2_pwd, fAllowUnencrypted, fAllowRemote, host):
    assert(is_unicode(command_line))
    assert(_rpdb2_pwd == None or is_unicode(_rpdb2_pwd))

    if (not fAllowUnencrypted) and not is_encryption_supported():
        _print(STR_ENCRYPTION_SUPPORT_ERROR)
        return 2
    
    sm = CSessionManager(_rpdb2_pwd, fAllowUnencrypted, fAllowRemote, host)
    c = CConsole(sm)
    c.start()

    time.sleep(1.0)

    try:
        if fAttach:
            sm.attach(command_line)
        elif command_line != '':
            sm.launch(fchdir, command_line)
            
    except (socket.error, CConnectionException):
        sm.report_exception(*sys.exc_info())
    except CException:
        sm.report_exception(*sys.exc_info())
    except:
        sm.report_exception(*sys.exc_info())
        print_debug_exception(True)
        
    c.join()
    sm.shutdown()



def PrintUsage(fExtended = False):
    scriptName = os.path.basename(sys.argv[0])
    _print(""" %(rpdb)s [options] [<script-name> [<script-args>...]]

    %(rpdb)s uses the client-server model where the debugger UI/console is
    the client and the debugged script is the server (also called debuggee).
    The client and the server are separate processes and communicate over 
    sockets.

    Example: The following command starts the debugger UI/console and then 
    launches and attaches to the specified script:
    %(rpdb)s some_script.py 

    Options can be a combination of the following:
    -h, --help      Print this help.
    -d, --debuggee  Start the debugged script (server) and wait for a 
                    debugger console (client) to attach. 
    -a, --attach    Start the debugger console (client) and attach to the 
                    specified debugged script (server).
    -o, --host=     Specify host (or IP address) for remote connections.
    -r, --remote    Allow debuggees to accept connections from remote machines.
    -e, --encrypt   Force encrypted socket communication.
    -p, --pwd=      Specify password for socket communication. 
                    This flag is available only on Windows. On other 
                    systems the password will be queried interactively 
                    if it is needed.
    -s, --screen    Use the Unix screen utility when starting the debuggee.
                    Note that the debugger should be started as follows:
                    screen rpdb2 -s [options] [<script-name> [<script-args>...]]
    -c, --chdir     Change the working directory to that of the launched 
                    script.
    -v, --version   Print version information.
    --debug         Debug prints.

    Note that each option is available in short form (example -e) and in a 
    long form (example --encrypt).

    Options that end with '=' accept an argument that should follow without
    a space. For example to specify 192.168.0.10 as host use the following 
    option: 

        long form: --host=192.168.0.10
        short form: -o192.168.0.10
""" % {"rpdb": scriptName})
    
    if not fExtended:
        return
        
    _print(__doc__)



def main(StartClient_func = StartClient, version = RPDB_TITLE):
    global g_fScreen
    global g_fDebug
    global g_fFirewallTest
    
    create_rpdb_settings_folder()

    encoding = detect_locale()
    argv = [as_unicode(arg, encoding) for arg in sys.argv]
    
    try:
        options, _rpdb2_args = getopt.getopt(
                            argv[1:], 
                            'hdao:rtep:scv', 
                            ['help', 'debugee', 'debuggee', 'attach', 'host=', 'remote', 'plaintext', 'encrypt', 'pwd=', 'rid=', 'screen', 'chdir', 'base64=', 'nofwtest', 'version', 'debug']
                            )

    except getopt.GetoptError:
        PrintUsage()
        return 2
        
    fWrap = False
    fAttach = False
    fSpawn = False
    fStart = False
    
    encoded_path = None
    secret = None
    host = None
    _rpdb2_pwd = None
    fchdir = False
    fAllowRemote = False
    fAllowUnencrypted = True
    
    for o, a in options:
        if o in ['-h', '--help']:
            PrintUsage()
            return 0
        if o in ['-v', '--version']:
            _print(version)
            return 0
        if o in ['--debug']:
            g_fDebug = True 
        if o in ['-d', '--debugee', '--debuggee']:
            fWrap = True
        if o in ['-a', '--attach']:
            fAttach = True
        if o in ['-o', '--host']:
            host = a
        if o in ['-r', '--remote']:
            fAllowRemote = True
        if o in ['-t', '--plaintext']:
            fAllowUnencrypted = True
        if o in ['-e', '--encrypt']:
            fAllowUnencrypted = False
        if o in ['-p', '--pwd']:
            _rpdb2_pwd = a
        if o in ['--rid']:
            secret = a
        if o in ['-s', '--screen']:
            g_fScreen = True
        if o in ['-c', '--chdir']:
            fchdir = True
        if o in ['--base64']:
            encoded_path = a
        if o in ['--nofwtest']:
            g_fFirewallTest = False
    
    arg = None
    argv = None
    options = None
    o = None
    a = None

    if (_rpdb2_pwd is not None) and (os.name != 'nt'):
        _print(STR_PASSWORD_NOT_SUPPORTED)
        return 2

    if _rpdb2_pwd is not None and not is_valid_pwd(_rpdb2_pwd):
        _print(STR_PASSWORD_BAD)
        return 2

    if fWrap and (len(_rpdb2_args) == 0):
        _print("--debuggee option requires a script name with optional <script-arg> arguments")
        return 2
        
    if fWrap and fAttach:
        _print("--debuggee and --attach can not be used together.")
        return 2
        
    if fAttach and (len(_rpdb2_args) == 0):
        _print("--attach option requires a script name to attach to.")
        return 2
        
    if fAttach and (len(_rpdb2_args) > 1):
        _print("--attach option does not accept <script-arg> arguments.")
        return 2

    if fAttach and fAllowRemote:
        _print("--attach and --remote can not be used together.")
        return 2
        
    if (host is not None) and not fAttach:
        _print("--host can only be used together with --attach.")
        return 2

    if host is None:
        host = LOCALHOST    

    fSpawn = (len(_rpdb2_args) != 0) and (not fWrap) and (not fAttach)
    fStart = (len(_rpdb2_args) == 0)
    
    if fchdir and not (fWrap or fSpawn):
        _print("-c can only be used when launching or starting a script from command line.")
        return 2

    assert (fWrap + fAttach + fSpawn + fStart) == 1

    if fAttach and (os.name == POSIX):
        try:
            int(_rpdb2_args[0])

            _rpdb2_pwd = read_pwd_file(_rpdb2_args[0])
            delete_pwd_file(_rpdb2_args[0])

        except (ValueError, IOError):
            pass
            
    if (secret is not None) and (os.name == POSIX):
        _rpdb2_pwd = read_pwd_file(secret)
        
    if (fWrap or fAttach) and not is_valid_pwd(_rpdb2_pwd):
        _print(STR_PASSWORD_MUST_BE_SET)
        
        while True:
            _rpdb2_pwd = _raw_input(STR_PASSWORD_INPUT)
            if is_valid_pwd(_rpdb2_pwd):
                break

            _print(STR_PASSWORD_BAD)

        _print(STR_PASSWORD_CONFIRM)
                
    if fWrap or fSpawn:
        try:
            if encoded_path != None:
                _b = as_bytes(encoded_path).translate(g_safe_base64_from)
                _u = base64.decodestring(_b)
                _path = as_unicode(_u)
                _rpdb2_args[0] = _path

            FindFile(_rpdb2_args[0])
        except IOError:
            _print(STR_FILE_NOT_FOUND % _rpdb2_args[0])
            return 2
            
    if fWrap:
        if (not fAllowUnencrypted) and not is_encryption_supported():
            _print(STR_ENCRYPTION_SUPPORT_ERROR)
            return 2

        StartServer(_rpdb2_args, fchdir, _rpdb2_pwd, fAllowUnencrypted, fAllowRemote, secret)
        
    elif fAttach:
        StartClient_func(_rpdb2_args[0], fAttach, fchdir, _rpdb2_pwd, fAllowUnencrypted, fAllowRemote, host)
        
    elif fStart:
        StartClient_func(as_unicode(''), fAttach, fchdir, _rpdb2_pwd, fAllowUnencrypted, fAllowRemote, host)
        
    else:
        if len(_rpdb2_args) == 0:
            _rpdb2_args = ''
        else:
            _rpdb2_args = '"' + '" "'.join(_rpdb2_args) + '"'

        StartClient_func(_rpdb2_args, fAttach, fchdir, _rpdb2_pwd, fAllowUnencrypted, fAllowRemote, host)
   
    return 0



if __name__ == '__main__':
    import rpdb2

    #
    # Debuggee breaks (pauses) here
    # on unhandled exceptions.
    # Use analyze mode for post mortem.
    # type 'help analyze' for more information.
    #
    ret = rpdb2.main()

    #
    # Debuggee breaks (pauses) here 
    # before program termination. 
    #
    # You can step to debug any exit handlers.
    #
    rpdb2.setbreak()



