Fix: relayd: failure to read index entry or stream packet after clear

[lttng-tools.git] / src / bin / lttng-relayd / viewer-stream.h

diff --git a/src/bin/lttng-relayd/viewer-stream.h b/src/bin/lttng-relayd/viewer-stream.h
index 63fb71cb6ad39ed896e6f675456629612b0e586f..e7d733b9e60ecb10479992b5e74042089e824cdb 100644 (file)
--- a/src/bin/lttng-relayd/viewer-stream.h
+++ b/src/bin/lttng-relayd/viewer-stream.h
@@ -2,22 +2,12 @@
 #define _VIEWER_STREAM_H
 
 /*
- * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
- *                      David Goulet <dgoulet@efficios.com>
- *               2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com>
+ * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License, version 2 only, as
- * published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
  *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #include <limits.h>
@@ -55,6 +45,14 @@ struct relay_viewer_stream {
        } stream_file;
        /* index file from which to read the index data. */
        struct lttng_index_file *index_file;
+       /*
+        * Last seen rotation count in stream.
+        *
+        * Sampled on every change to the viewer stream trace chunk,
+        * this allows the live server to determine if it saw the latest
+        * rotation that occurred on the receiving end.
+        */
+       uint64_t last_seen_rotation_count;
 
        char *path_name;
        char *channel_name;