+ struct relay_viewer_stream *vstream;
+ uint64_t new_id;
+
+ new_id = (stream->tracefile_count_current + 1) %
+ stream->tracefile_count;
+ /*
+ * When we wrap-around back to 0, we start overwriting old
+ * trace data.
+ */
+ if (!stream->tracefile_overwrite && new_id == 0) {
+ stream->tracefile_overwrite = 1;
+ }
+ pthread_mutex_lock(&stream->viewer_stream_rotation_lock);
+ if (stream->tracefile_overwrite) {
+ stream->oldest_tracefile_id =
+ (stream->oldest_tracefile_id + 1) %
+ stream->tracefile_count;
+ }
+ vstream = live_find_viewer_stream_by_id(stream->stream_handle);
+ if (vstream) {
+ /*
+ * The viewer is reading a file about to be
+ * overwritten. Close the FDs it is
+ * currently using and let it handle the fault.
+ */
+ if (vstream->tracefile_count_current == new_id) {
+ vstream->abort_flag = 1;
+ vstream->close_write_flag = 1;
+
+ ret = close(vstream->read_fd);
+ if (ret < 0) {
+ PERROR("close index");
+ }
+
+ ret = close(vstream->index_read_fd);
+ if (ret < 0) {
+ PERROR("close tracefile");
+ }
+ DBG("Streaming side setting abort_flag on stream %s_%lu\n",
+ stream->channel_name, new_id);
+ } else if (vstream->tracefile_count_current ==
+ stream->tracefile_count_current) {
+ /*
+ * The reader and writer were in the
+ * same trace file, inform the viewer
+ * that no new index will ever be added
+ * to this file.
+ */
+ vstream->close_write_flag = 1;
+ }
+ }