A #GDBusConnection.
The name (well-known or unique) to watch.
Flags from the #GBusNameWatcherFlags enumeration.
#GClosure to invoke when @name is known to exist or %NULL.
#GClosure to invoke when @name is known to not exist or %NULL.
An identifier (never 0) that an be used with g_bus_unwatch_name() to stop watching the name.
2.26
Version of g_bus_watch_name_on_connection() using closures instead of callbacks for easier binding in other languages.