#!/usr/bin/python

import os
import gobject
import dbus
from dbus.mainloop.glib import DBusGMainLoop

def sleep_signal_recieved(arg):
  print("sleep signal recieved, arg: " + str(arg))
  while True:
    pass
def shutdown_signal_recieved(arg):
  print("shutdown signal recieved, arg: " + str(arg))
  while True:
    pass

def main():
  DBusGMainLoop(set_as_default=True)
  loop = gobject.MainLoop()

  bus = dbus.SystemBus()
  obj = bus.get_object("org.freedesktop.login1",
                                  "/org/freedesktop/login1")
  interface = dbus.Interface(obj, "org.freedesktop.login1.Manager")

  fd = interface.Inhibit("shutdown:sleep:idle", "brendan", "because", "block")
  #fd will be a "low-level file descriptor" i.e. an int. close it with os.close
  fd = fd.take()

  interface.connect_to_signal("PrepareForSleep", sleep_signal_recieved)
  interface.connect_to_signal("PrepareForShutdown", shutdown_signal_recieved)
  loop.run()

if __name__ == "__main__":
  main()