How to achieve desired results when using the subprocees Popen.send_signal(CTRL_C_EVENT) in Windows?

Question

In python 2.7 in windows according to the documentation you can send a CTRL_C_EVENT (Python 2.7 Subprocess Popen.send_signal documentation). However when I tried it I did no

Answer 1

This method of signal handling by subprocesses worked for me on both Linux and Windows 2008, both using Python 2.7.2, but it uses Ctrl-Break instead of Ctrl-C. See the note about process groups and Ctrl-C in http://msdn.microsoft.com/en-us/library/ms683155%28v=vs.85%29.aspx.

catcher.py:

import os
import signal
import sys
import time

def signal_handler(signal, frame):
  print 'catcher: signal %d received!' % signal
  raise Exception('catcher: i am done')

if hasattr(os.sys, 'winver'):
    signal.signal(signal.SIGBREAK, signal_handler)
else:
    signal.signal(signal.SIGTERM, signal_handler)

print 'catcher: started'
try:
    while(True):
        print 'catcher: sleeping...'
        time.sleep(1)
except Exception as ex:
    print ex
    sys.exit(0)

thrower.py:

import signal
import subprocess
import time
import os

args = [
    'python',
    'catcher.py',
    ]
print 'thrower: starting catcher'
if hasattr(os.sys, 'winver'):
    process = subprocess.Popen(args, creationflags=subprocess.CREATE_NEW_PROCESS_GROUP)
else:
    process = subprocess.Popen(args)

print 'thrower: waiting a couple of seconds for catcher to start...'
time.sleep(2)
print 'thrower: sending signal to catch'

if hasattr(os.sys, 'winver'):
    os.kill(process.pid, signal.CTRL_BREAK_EVENT)
else:
    process.send_signal(signal.SIGTERM)

print 'thrower: i am done'

Answer 2

try with

win32api.GenerateConsoleCtrlEvent(CTRL_C_EVENT, pgroupid)

or

win32api.GenerateConsoleCtrlEvent(CTRL_BREAK_EVENT, pgroupid)

references:

http://docs.activestate.com/activepython/2.5/pywin3/win32process_CREATE_NEW_PROCESS_GROUP.html

http://msdn.microsoft.com/en-us/library/ms683155%28v=vs.85%29.aspx

read info about dwProcessGroupId, the groupid should be the same of the process id