+
+int sd_bus_add_match(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata) {
+ int r = 0;
+
+ if (!bus)
+ return -EINVAL;
+ if (!match)
+ return -EINVAL;
+
+ if (bus->bus_client) {
+ r = bus_add_match_internal(bus, match);
+ if (r < 0)
+ return r;
+ }
+
+ if (callback) {
+ bus->match_callbacks_modified = true;
+ r = bus_match_add(&bus->match_callbacks, match, callback, userdata, NULL);
+ if (r < 0) {
+
+ if (bus->bus_client)
+ bus_remove_match_internal(bus, match);
+ }
+ }
+
+ return r;
+}
+
+int sd_bus_remove_match(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata) {
+ int r = 0, q = 0;
+
+ if (!bus)
+ return -EINVAL;
+ if (!match)
+ return -EINVAL;
+
+ if (bus->bus_client)
+ r = bus_remove_match_internal(bus, match);
+
+ if (callback) {
+ bus->match_callbacks_modified = true;
+ q = bus_match_remove(&bus->match_callbacks, match, callback, userdata);
+ }
+
+ if (r < 0)
+ return r;
+ return q;
+}
+
+int sd_bus_emit_signal(
+ sd_bus *bus,
+ const char *path,
+ const char *interface,
+ const char *member,
+ const char *types, ...) {
+
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ va_list ap;
+ int r;
+
+ if (!bus)
+ return -EINVAL;
+
+ r = sd_bus_message_new_signal(bus, path, interface, member, &m);
+ if (r < 0)
+ return r;
+
+ va_start(ap, types);
+ r = bus_message_append_ap(m, types, ap);
+ va_end(ap);
+ if (r < 0)
+ return r;
+
+ return sd_bus_send(bus, m, NULL);
+}
+
+int sd_bus_call_method(
+ sd_bus *bus,
+ const char *destination,
+ const char *path,
+ const char *interface,
+ const char *member,
+ sd_bus_error *error,
+ sd_bus_message **reply,
+ const char *types, ...) {
+
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ va_list ap;
+ int r;
+
+ if (!bus)
+ return -EINVAL;
+
+ r = sd_bus_message_new_method_call(bus, destination, path, interface, member, &m);
+ if (r < 0)
+ return r;
+
+ va_start(ap, types);
+ r = bus_message_append_ap(m, types, ap);
+ va_end(ap);
+ if (r < 0)
+ return r;
+
+ return sd_bus_send_with_reply_and_block(bus, m, 0, error, reply);
+}
+
+int sd_bus_reply_method_return(
+ sd_bus *bus,
+ sd_bus_message *call,
+ const char *types, ...) {
+
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ va_list ap;
+ int r;
+
+ if (!bus)
+ return -EINVAL;
+ if (!call)
+ return -EINVAL;
+ if (!call->sealed)
+ return -EPERM;
+ if (call->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL)
+ return -EINVAL;
+
+ if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED)
+ return 0;
+
+ r = sd_bus_message_new_method_return(bus, call, &m);
+ if (r < 0)
+ return r;
+
+ va_start(ap, types);
+ r = bus_message_append_ap(m, types, ap);
+ va_end(ap);
+ if (r < 0)
+ return r;
+
+ return sd_bus_send(bus, m, NULL);
+}
+
+int sd_bus_reply_method_error(
+ sd_bus *bus,
+ sd_bus_message *call,
+ const sd_bus_error *e) {
+
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ int r;
+
+ if (!bus)
+ return -EINVAL;
+ if (!call)
+ return -EINVAL;
+ if (!call->sealed)
+ return -EPERM;
+ if (call->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL)
+ return -EINVAL;
+ if (!sd_bus_error_is_set(e))
+ return -EINVAL;
+
+ if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED)
+ return 0;
+
+ r = sd_bus_message_new_method_error(bus, call, e, &m);
+ if (r < 0)
+ return r;
+
+ return sd_bus_send(bus, m, NULL);
+}