signal_subscribe

Subscribes to signals on this and invokes callback with a whenever the signal is received.

Note that callback will be invoked in the thread-default main context of the thread you are calling this method from.

If this is not a message bus connection, sender must be null.

If sender is a well-known name note that callback is invoked with the unique name for the owner of sender , not the well-known name as one would expect. This is because the message bus rewrites the name. As such, to avoid certain race conditions, users should be tracking the name owner of the well-known name and use that when processing the received signal.

If one of g_dbus_signal_flags_match_arg0_namespace or g_dbus_signal_flags_match_arg0_path are given, arg0 is interpreted as part of a namespace or path. The first argument of a signal is matched against that part as specified by D-Bus.

Parameters:

this	a DBusConnection
sender	sender name to match on (unique or well-known name) or null to listen from all senders
interface_name	D-Bus interface name to match on or null to match on all interfaces
member	D-Bus signal name to match on or null to match on all signals
object_path	object path to match on or null to match on all object paths
arg0	contents of first string argument to match on or null to match on all kinds of arguments
flags	flags describing how to subscribe to the signal (currently unused)
callback	callback to invoke when there is a signal matching the requested data
user_data	user data to pass to callback
user_data_free_func	function to free user_data with when subscription is removed or null

Returns:

a subscription identifier that can be used with signal_unsubscribe