extern int afb_evt_add_watch(struct afb_evt_listener *listener, struct afb_event event);
extern int afb_evt_remove_watch(struct afb_evt_listener *listener, struct afb_event event);
extern int afb_evt_add_watch(struct afb_evt_listener *listener, struct afb_event event);
extern int afb_evt_remove_watch(struct afb_evt_listener *listener, struct afb_event event);