Function glib_sys::g_io_add_watch_full

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