+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_get_audit_sessionid(sd_bus_message *m, uint32_t *sessionid);
+int sd_bus_message_get_audit_loginuid(sd_bus_message *m, uid_t *loginuid);
+int sd_bus_message_has_effective_cap(sd_bus_message *m, int capability);