Function gio_sys::g_bus_watch_name_on_connection

pub unsafe extern "C" fn g_bus_watch_name_on_connection(
    connection: *mut GDBusConnection, 
    name: *const c_char, 
    flags: GBusNameWatcherFlags, 
    name_appeared_handler: GBusNameAppearedCallback, 
    name_vanished_handler: GBusNameVanishedCallback, 
    user_data: gpointer, 
    user_data_free_func: GDestroyNotify
) -> c_uint