How do I detect when my system wakes up from suspend via DBus or similar in a python app?
Solution 1:
Here is some example code that answers my question:
#!/usr/bin/python
# This is some example code on howto use dbus to detect when the system returns
#+from hibernation or suspend.
import dbus # for dbus communication (obviously)
import gobject # main loop
from dbus.mainloop.glib import DBusGMainLoop # integration into the main loop
def handle_resume_callback():
print "System just resumed from hibernate or suspend"
DBusGMainLoop(set_as_default=True) # integrate into main loob
bus = dbus.SystemBus() # connect to dbus system wide
bus.add_signal_receiver( # defince the signal to listen to
handle_resume_callback, # name of callback function
'Resuming', # singal name
'org.freedesktop.UPower', # interface
'org.freedesktop.UPower' # bus name
)
loop = gobject.MainLoop() # define mainloop
loop.run() # run main loop
See the dbus-python tutorial.
Solution 2:
The login1 interface provides the signal now. Here is the modified code:
#!/usr/bin/python
# slightly different code for handling suspend resume
# using login1 interface signals
#
import dbus # for dbus communication (obviously)
import gobject # main loop
from dbus.mainloop.glib import DBusGMainLoop # integration into the main loop
def handle_sleep_callback(sleeping):
if sleeping:
print "System going to hibernate or sleep"
else:
print "System just resumed from hibernate or suspend"
DBusGMainLoop(set_as_default=True) # integrate into main loob
bus = dbus.SystemBus() # connect to dbus system wide
bus.add_signal_receiver( # defince the signal to listen to
handle_sleep_callback, # name of callback function
'PrepareForSleep', # signal name
'org.freedesktop.login1.Manager', # interface
'org.freedesktop.login1' # bus name
)
loop = gobject.MainLoop() # define mainloop
loop.run() # run main loop