# Copyright (c) 2009, Mario Vilas
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# $Id: example8.py 153 2009-05-15 22:42:28Z qvasimodo $

# Example #8
# http://apps.sourceforge.net/trac/winappdbg/wiki/wiki/Instrumentation#Example8:freezeallthreadsinaprocess

from winappdbg import Process, System

def freeze_threads( pid ):

    # Request debug privileges
    System.request_debug_privileges()

    # Instance a Process object
    process = Process( pid )

    # This would also do the trick...
    #
    #   process.suspend()
    #
    # ...but let's do it the hard way:

    # Lookup the threads in the process
    process.scan_threads()

    # For each thread in the process...
    for thread in process:

        # Suspend the thread execution
        thread.suspend()

def unfreeze_threads( pid ):

    # Request debug privileges
    System.request_debug_privileges()

    # Instance a Process object
    process = Process( pid )

    # This would also do the trick...
    #
    #   process.resume()
    #
    # ...but let's do it the hard way:

    # Lookup the threads in the process
    process.scan_threads()

    # For each thread in the process...
    for thread in process:

        # Resume the thread execution
        thread.resume()

# When invoked from the command line,
# the first argument is either "f" or "u"
# the second argument is a process ID
if __name__ == "__main__":
    import sys
    command = sys.argv[1][0].lower()
    pid = int( sys.argv[2] )
    if command == 'f':
        freeze_threads( pid )
    elif command == 'u':
        unfreeze_threads( pid )   # to reverse the effect
    else:
        script = sys.argv[0]
        print "%s f <pid> - freeze a process" % script
        print "%s u <pid> - unfreeze a process" % script
