#!/usr/bin/env python # this is mostly based off of the code found here: # http://code.activestate.com/recipes/278731-creating-a-daemon-the-python-way/ from __future__ import absolute_import, division, print_function __metaclass__ = type import os import resource import signal import time UMASK = 0 WORKDIR = "/" MAXFD = 1024 if (hasattr(os, "devnull")): REDIRECT_TO = os.devnull else: REDIRECT_TO = "/dev/null" def createDaemon(): try: pid = os.fork() except OSError as e: raise Exception("%s [%d]" % (e.strerror, e.errno)) if (pid == 0): os.setsid() try: pid = os.fork() except OSError as e: raise Exception("%s [%d]" % (e.strerror, e.errno)) if (pid == 0): os.chdir(WORKDIR) os.umask(UMASK) else: f = open('/var/run/ansible_test_service.pid', 'w') f.write("%d\n" % pid) f.close() os._exit(0) else: os._exit(0) maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1] if (maxfd == resource.RLIM_INFINITY): maxfd = MAXFD for fd in range(0, maxfd): try: os.close(fd) except OSError: # ERROR, fd wasn't open to begin with (ignored) pass os.open(REDIRECT_TO, os.O_RDWR) os.dup2(0, 1) os.dup2(0, 2) return (0) if __name__ == "__main__": signal.signal(signal.SIGHUP, signal.SIG_IGN) retCode = createDaemon() while True: time.sleep(1000)