Function glib_sys::g_io_add_watch_full

pub unsafe extern fn g_io_add_watch_full(channel: *mut GIOChannel,
                                         priority: c_int,
                                         condition: GIOCondition,
                                         func: GIOFunc,
                                         user_data: gpointer,
                                         notify: GDestroyNotify)
                                         -> c_uint