+_public_ int sd_bus_message_is_empty(sd_bus_message *m) {
+ assert_return(m, -EINVAL);
+
+ return isempty(m->root_container.signature);
+}
+
+_public_ int sd_bus_message_has_signature(sd_bus_message *m, const char *signature) {
+ assert_return(m, -EINVAL);
+
+ return streq(strempty(m->root_container.signature), strempty(signature));
+}
+