int sd_bus_remove_fallback(sd_bus *bus, const char *prefix, sd_bus_message_handler_t callback, void *userdata);
int sd_bus_add_object_vtable(sd_bus *bus, const char *path, const char *interface, const sd_bus_vtable *vtable, void *userdata);
int sd_bus_remove_fallback(sd_bus *bus, const char *prefix, sd_bus_message_handler_t callback, void *userdata);
int sd_bus_add_object_vtable(sd_bus *bus, const char *path, const char *interface, const sd_bus_vtable *vtable, void *userdata);