try to manage child processes in python

childmgr.py

import os
import signal
import time


def main():
    commands = [
        ("python", "sample.py"),
        ("python", "sample.py"),
        ]

    children = []
    for i in commands:
        pid = os.fork()
        if pid == 0:
            # child
            os.execvp(i[0], i)
        else:
            # parent
            children.append(pid)

    try:
        while True:
            print children
            time.sleep(1)
    except KeyboardInterrupt:
        for c in children:
            os.kill(c, signal.SIGUSR1)
            print os.waitpid(c, 0)


if __name__ == "__main__":
    main()

sample.py

import os
import signal
import time


def main():
    shutdown = False
    def sighandler(signum, grame):
        shutdown = True

    signal.signal(signal.SIGUSR1, sighandler)

    pid = os.getpid()
    i = 0
    with open("/tmp/{0}".format(pid), "w") as fp:
        while True:
            fp.write("{0}\n".format(i))
            fp.flush()
            if shutdown:
                break
            time.sleep(1)
            i += 1


if __name__ == "__main__":
    main()