import os, sys, time

# Main loop
def main():
    # Drop privs.
    os.setgid(1000) # Replace with desired GID
    os.setuid(1000) # Replace with desired UID

    time.sleep(10)
    sys.exit(0)

if (not os.fork()):
    os.setsid() # Become session leader
    pid = os.fork()

    if (pid):
        # Parent, write PID file
        fp = open('/var/run/my-daemon.pid', 'w')
        fp.write(str(pid))
        fp.flush()

        # Forcibly sync disk
        os.fsync(fp.fileno())
        fp.close()

        os._exit(0)
    else:
        # Child, call main
        main()
else:
    # Parent
    os._exit(0)