import os
import sys
import time
import signal
import ctypes
import subprocess

kernel32 = ctypes.WinDLL('kernel32')

def handler(*args):
    print('Process %04d: received CTRL+C' % os.getpid())
    sys.exit(0)

signal.signal(signal.SIGINT, handler)

def parent():
    p = subprocess.Popen([sys.executable, __file__, 'child'],
                         creationflags=subprocess.CREATE_NEW_PROCESS_GROUP)
    print('Process %04d: created process %04d' % (os.getpid(), p.pid))
    pychild = kernel32.CreateEventW(None, 0, 0, 'pychild')
    # wait for the child and grandchild to be ready
    kernel32.WaitForSingleObject(pychild, 4000)
    # send CTRL+C to them both
    p.send_signal(signal.CTRL_C_EVENT)
    try:
        p.wait(4)
    except subprocess.TimeoutExpired:
        p.kill()

def child():
    # enable CTRL+C
    kernel32.SetConsoleCtrlHandler(None, 0)

    p = subprocess.Popen([sys.executable, __file__, 'grandchild'])
    print('Process %04d: created process %04d' % (os.getpid(), p.pid))
    pychild = kernel32.CreateEventW(None, 0, 0, 'pychild')
    pygrandchild = kernel32.CreateEventW(None, 0, 0, 'pygrandchild')
    kernel32.WaitForSingleObject(pygrandchild, 3000)
    kernel32.SetEvent(pychild)
    time.sleep(3)

def grandchild():
    pygrandchild = kernel32.CreateEventW(None, 0, 0, 'pygrandchild')
    kernel32.SetEvent(pygrandchild)
    time.sleep(3)

if __name__ == '__main__':
    if len(sys.argv) < 2:
        parent()
    elif sys.argv[1] == 'child':
        child()
    elif sys.argv[1] == 'grandchild':
        grandchild()