[Tutor] totally stumped on signal code, wont work in this instance

[dave selby]

Hi,

I have been hitting my head on a brick wall on a bit of code that
refuses to work. I have similar code in other scripts that works AOK
I have commented out all functionality except the core problem ...


import sys, threading, time, os.path, urllib, time, signal, ConfigParser, logger
....

def main():
    #logger.log('daemon starting ...', 'CRIT')
    #read_config()
    #thread1 = Thread1_PTZ()
    #thread1.setDaemon(True)
    #thread1.start()
    #thread2 = Thread2_PTZ_Park()
    #thread2.setDaemon(True)
    #thread2.start()
    #thread3 = Thread3_PTZ_Preset()
    #thread3.setDaemon(True)
    #thread3.start()

    while True: # sleep to keep daemons alive :)
        time.sleep(60 * 60 * 24)


def signal_hup(signum, frame):
    """
    SIGHUP, unlike all other daemons SIGHUP causes this daemon to exit killing
    all its daemon threads. This is a workaround. Because 'kmotion_ptzd' is
    threaded the only way to get the threads to reliably reload their config
    is to kill and restart else they languish in a sleep state for ? secs.

    args    : discarded
    excepts :
    return  : none
    """

    print 'sighup :)'
    #logger.log('signal SIGHUP detected, shutting down due to
threading', 'CRIT')
    #sys.exit()

...
main()

So main just sits there AOK. I send a sighup to the script with

pkill -SIGHUP -f python.+kmotion_ptzd.py

and I get ...

dave at main-system:~/kmotion2/core$ ./kmotion_ptzd.py
Hangup
dave at main-system:~/kmotion2/core$

OK so I would have expected signal_hup to have intercepted the signal
and printed 'sighup :)'
and also not have exited in this case.

Any ideas, I can solve most of my python probs but this one has me stumped.

Cheers

Dave










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