send / receive USR1 signal

gistfile1.txt

#!/usr/bin/env python

import os
import sys
import signal


if __name__ == "__main__":
    print "sending signal, pid="+repr(sys.argv[1])
    os.kill(int(sys.argv[1]), signal.SIGUSR1)
    print "signal sent..."

signal_ex.py

#!/usr/bin/env python

import os
import sys
import signal
import gtk

class SignalEx():

    def __init__(self):

        self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)

        self.window.connect("destroy", self.destroy)

        self.window.set_border_width(10)

        self.label = gtk.Label("waiting for signal, pid="+repr(os.getpid()))

        self.window.add(self.label)

        self.label.show()

        self.window.show()

        signal.signal(signal.SIGUSR1, self.signal_handler)

    def destroy(self, widget, data=None):
        print "destroy signal occurred"
        gtk.main_quit()

    def signal_handler(self, n, stack):
        self.label.set_text("signal received: "+repr(n))
        print "signal received: "+repr(n)

    def main(self):
        gtk.main()


if __name__ == "__main__":
    print "process id: " +repr(os.getpid())
    signalex = SignalEx()
    signalex.main()