-int sd_event_add_io(sd_event *e, int fd, uint32_t events, sd_io_handler_t callback, void *userdata, sd_event_source **s);
-int sd_event_add_monotonic(sd_event *e, uint64_t usec, uint64_t accuracy, sd_time_handler_t callback, void *userdata, sd_event_source **s);
-int sd_event_add_realtime(sd_event *e, uint64_t usec, uint64_t accuracy, sd_time_handler_t callback, void *userdata, sd_event_source **s);
-int sd_event_add_signal(sd_event *e, int sig, sd_signal_handler_t callback, void *userdata, sd_event_source **s);
-int sd_event_add_child(sd_event *e, pid_t pid, int options, sd_child_handler_t callback, void *userdata, sd_event_source **s);
-int sd_event_add_defer(sd_event *e, sd_defer_handler_t callback, void *userdata, sd_event_source **s);
-int sd_event_add_quit(sd_event *e, sd_quit_handler_t callback, void *userdata, sd_event_source **s);
+int sd_event_add_io(sd_event *e, int fd, uint32_t events, sd_event_io_handler_t callback, void *userdata, sd_event_source **s);
+int sd_event_add_monotonic(sd_event *e, uint64_t usec, uint64_t accuracy, sd_event_time_handler_t callback, void *userdata, sd_event_source **s);
+int sd_event_add_realtime(sd_event *e, uint64_t usec, uint64_t accuracy, sd_event_time_handler_t callback, void *userdata, sd_event_source **s);
+int sd_event_add_signal(sd_event *e, int sig, sd_event_signal_handler_t callback, void *userdata, sd_event_source **s);
+int sd_event_add_child(sd_event *e, pid_t pid, int options, sd_event_child_handler_t callback, void *userdata, sd_event_source **s);
+int sd_event_add_defer(sd_event *e, sd_event_handler_t callback, void *userdata, sd_event_source **s);
+int sd_event_add_quit(sd_event *e, sd_event_handler_t callback, void *userdata, sd_event_source **s);