+/*
+ * Detach a viewer session.
+ *
+ * Return 0 on success or else a negative value.
+ */
+static
+int viewer_detach_session(struct relay_connection *conn)
+{
+ int ret;
+ struct lttng_viewer_detach_session_response response;
+ struct lttng_viewer_detach_session_request request;
+ struct relay_session *session = NULL;
+ uint64_t viewer_session_to_close;
+
+ DBG("Viewer detach session received");
+
+ assert(conn);
+
+ health_code_update();
+
+ /* Receive the request from the connected client. */
+ ret = recv_request(conn->sock, &request, sizeof(request));
+ if (ret < 0) {
+ goto end;
+ }
+ viewer_session_to_close = be64toh(request.session_id);
+
+ if (!conn->viewer_session) {
+ DBG("Client trying to detach before creating a live viewer session");
+ response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR);
+ goto send_reply;
+ }
+
+ health_code_update();
+
+ memset(&response, 0, sizeof(response));
+ DBG("Detaching from session ID %" PRIu64, viewer_session_to_close);
+
+ session = session_get_by_id(be64toh(request.session_id));
+ if (!session) {
+ DBG("Relay session %" PRIu64 " not found",
+ (uint64_t) be64toh(request.session_id));
+ response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK);
+ goto send_reply;
+ }
+
+ ret = viewer_session_is_attached(conn->viewer_session, session);
+ if (ret != 1) {
+ DBG("Not attached to this session");
+ response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR);
+ goto send_reply_put;
+ }
+
+ viewer_session_close_one_session(conn->viewer_session, session);
+ response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK);
+ DBG("Session %" PRIu64 " detached.", viewer_session_to_close);
+
+send_reply_put:
+ session_put(session);
+
+send_reply:
+ health_code_update();
+ ret = send_response(conn->sock, &response, sizeof(response));
+ if (ret < 0) {
+ goto end;
+ }
+ health_code_update();
+ ret = 0;
+
+end:
+ return ret;
+}