+int ubus_publish(struct ubus_context *ctx, struct ubus_object *obj)
+{
+ if (!obj->name || !obj->type)
+ return UBUS_STATUS_INVALID_ARGUMENT;
+
+ return __ubus_publish(ctx, obj);
+}
+
+static int ubus_event_cb(struct ubus_context *ctx, struct ubus_object *obj,
+ struct ubus_request_data *req,
+ const char *method, struct blob_attr *msg)
+{
+ struct ubus_event_handler *ev;
+
+ ev = container_of(obj, struct ubus_event_handler, obj);
+ ev->cb(ctx, ev, method, msg);
+ return 0;
+}
+
+static const struct ubus_method event_method = {
+ .name = NULL,
+ .handler = ubus_event_cb,
+};
+
+int ubus_register_event_handler(struct ubus_context *ctx,
+ struct ubus_event_handler *ev,
+ const char *pattern)
+{
+ struct ubus_object *obj = &ev->obj;
+ struct blob_buf b2;
+ int ret;
+
+ if (!obj->id) {
+ obj->methods = &event_method;
+ obj->n_methods = 1;
+
+ if (!!obj->name ^ !!obj->type)
+ return UBUS_STATUS_INVALID_ARGUMENT;
+
+ ret = __ubus_publish(ctx, obj);
+ if (ret)
+ return ret;
+ }
+
+ /* use a second buffer, ubus_invoke() overwrites the primary one */
+ memset(&b2, 0, sizeof(b2));
+ blob_buf_init(&b2, 0);
+ blobmsg_add_u32(&b2, "object", obj->id);
+ if (pattern)
+ blobmsg_add_string(&b2, "pattern", pattern);
+
+ ret = ubus_invoke(ctx, UBUS_SYSTEM_OBJECT_EVENT, "register", b2.head,
+ NULL, NULL);
+
+ return 0;
+}
+
+