Dealing with kill commands from the outside world

in_cmd_logic.py

# 'p' is the Popen object for the subprocess

all_is_well = True

while True:
    try:
        (r, w, e) = zmq.select(
                [in_hb, in_cmd], [], [], timeout=end_time - time.time())

        for sock in r:
            msg = sock.recv() 

            if sock == in_cmd:
                print '[monitor] Order to execute'
                all_is_well = False
                retcode = 'Killed by order'

    except zmq.ZMQError as e:
        print '[monitor] *** ZMQ had a problem: ' + str(e)

    if not all_is_well:
        if not _kill(p):
            print '[monitor] Probably already dead.'
        break