libubus-req: add data_cb callback handling for ubus notifications

Signed-off-by: John Crispin <john@phrozen.org>

libubus-req.c

@@ -253,6 +253,18 @@ ubus_notify_complete_cb(struct ubus_request *req, int ret)
 	nreq->complete_cb(nreq, 0, 0);
 }
 
+static void
+ubus_notify_data_cb(struct ubus_request *req, int type, struct blob_attr *msg)
+{
+	struct ubus_notify_request *nreq;
+
+	nreq = container_of(req, struct ubus_notify_request, req);
+	if (!nreq->data_cb)
+		return;
+
+	nreq->data_cb(nreq, type, msg);
+}
+
 static int
 __ubus_notify_async(struct ubus_context *ctx, struct ubus_object *obj,
 		    const char *type, struct blob_attr *msg,
@@ -278,6 +290,7 @@ __ubus_notify_async(struct ubus_context *ctx, struct ubus_object *obj,
 	req->pending = 1;
 	req->id[0] = obj->id;
 	req->req.complete_cb = ubus_notify_complete_cb;
+	req->req.data_cb = ubus_notify_data_cb;
 
 	return 0;
 }

libubus.h

@@ -56,6 +56,8 @@ typedef void (*ubus_fd_handler_t)(struct ubus_request *req, int fd);
 typedef void (*ubus_complete_handler_t)(struct ubus_request *req, int ret);
 typedef void (*ubus_notify_complete_handler_t)(struct ubus_notify_request *req,
 					       int idx, int ret);
+typedef void (*ubus_notify_data_handler_t)(struct ubus_notify_request *req,
+					   int type, struct blob_attr *msg);
 typedef void (*ubus_connect_handler_t)(struct ubus_context *ctx);
 
 #define UBUS_OBJECT_TYPE(_name, _methods)		\
@@ -221,6 +223,7 @@ struct ubus_notify_request {
 
 	ubus_notify_complete_handler_t status_cb;
 	ubus_notify_complete_handler_t complete_cb;
+	ubus_notify_data_handler_t data_cb;
 
 	uint32_t pending;
 	uint32_t id[UBUS_MAX_NOTIFY_PEERS + 1];