int sd_bus_message_get_unit(sd_bus_message *m, const char **unit);
int sd_bus_message_get_user_unit(sd_bus_message *m, const char **unit);
int sd_bus_message_get_session(sd_bus_message *m, const char **session);
+int sd_bus_message_get_owner_uid(sd_bus_message *m, uid_t *uid);
int sd_bus_message_is_signal(sd_bus_message *m, const char *interface, const char *member);
int sd_bus_message_is_method_call(sd_bus_message *m, const char *interface, const char *member);