Fix end condition on rotate with live reading

[lttng-tools.git] / src / bin / lttng-relayd / live.c

diff --git a/src/bin/lttng-relayd/live.c b/src/bin/lttng-relayd/live.c
index a2fd09e32812fc322ac9299fa16f558ad39637ad..851be9f8e3165c85eb4bcf69bfbeb3d29508dade 100644 (file)
--- a/src/bin/lttng-relayd/live.c
+++ b/src/bin/lttng-relayd/live.c
@@ -698,6 +698,7 @@ int init_viewer_stream(struct relay_stream *stream, int seek_last)
                        LTTNG_VIEWER_NAME_MAX);
        viewer_stream->tracefile_count = stream->tracefile_count;
        viewer_stream->metadata_flag = stream->metadata_flag;
+       viewer_stream->tracefile_count_last = -1ULL;
        if (seek_last) {
                viewer_stream->tracefile_count_current =
                        stream->tracefile_count_current;
@@ -764,7 +765,7 @@ error:
 /*
  * Rotate a stream to the next tracefile.
  *
- * Returns 0 on success, a negative value on error.
+ * Returns 0 on success, 1 on EOF, a negative value on error.
  */
 static
 int rotate_viewer_stream(struct relay_viewer_stream *viewer_stream,
@@ -777,6 +778,15 @@ int rotate_viewer_stream(struct relay_viewer_stream *viewer_stream,
 
        tracefile_id = (viewer_stream->tracefile_count_current + 1) %
                viewer_stream->tracefile_count;
+       /*
+        * Detect the last tracefile to open.
+        */
+       if (viewer_stream->tracefile_count_last != -1ULL &&
+                       viewer_stream->tracefile_count_last ==
+                       viewer_stream->tracefile_count_current) {
+               ret = 1;
+               goto end;
+       }
 
        if (stream) {
                pthread_mutex_lock(&stream->viewer_stream_rotation_lock);
@@ -832,6 +842,7 @@ int rotate_viewer_stream(struct relay_viewer_stream *viewer_stream,
 
        ret = 0;
 
+end:
 error:
        return ret;
 }
@@ -1130,6 +1141,9 @@ int viewer_get_next_index(struct relay_command *cmd,
                        ret = rotate_viewer_stream(vstream, rstream);
                        if (ret < 0) {
                                goto end_unlock;
+                       } else if (ret == 1) {
+                               viewer_index.status = htobe32(VIEWER_INDEX_HUP);
+                               goto send_reply;
                        }
                }
                pthread_mutex_lock(&rstream->viewer_stream_rotation_lock);
@@ -1180,6 +1194,9 @@ int viewer_get_next_index(struct relay_command *cmd,
                ret = rotate_viewer_stream(vstream, rstream);
                if (ret < 0) {
                        goto end_unlock;
+               } else if (ret == 1) {
+                       viewer_index.status = htobe32(VIEWER_INDEX_HUP);
+                       goto send_reply;
                }
                goto send_reply;
        }
@@ -1196,6 +1213,9 @@ int viewer_get_next_index(struct relay_command *cmd,
                        ret = rotate_viewer_stream(vstream, rstream);
                        if (ret < 0) {
                                goto end_unlock;
+                       } else if (ret == 1) {
+                               viewer_index.status = htobe32(VIEWER_INDEX_HUP);
+                               goto send_reply;
                        }
                } else {
                        PERROR("Relay reading index file %d",