From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Tue, 25 Aug 2015 18:49:34 +0000 (-0400)
Subject: Fix: don't expose empty streams
X-Git-Tag: v2.7.0-rc2~87
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=1b95be80706a2f046cf526825b9da1f87a94b1ec;p=lttng-tools.git

Fix: don't expose empty streams

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---

diff --git a/src/bin/lttng-relayd/live.c b/src/bin/lttng-relayd/live.c
index 2972a500f..aa0586814 100644
--- a/src/bin/lttng-relayd/live.c
+++ b/src/bin/lttng-relayd/live.c
@@ -313,6 +313,12 @@ int make_viewer_streams(struct relay_session *session,
 			if (!stream->published) {
 				goto next;
 			}
+			/*
+			 * Stream has no data, don't consider it yet.
+			 */
+			if (stream->prev_seq == -1ULL) {
+				goto next;
+			}
 			vstream = viewer_stream_get_by_id(stream->stream_handle);
 			if (!vstream) {
 				vstream = viewer_stream_create(stream, seek_t);
diff --git a/src/bin/lttng-relayd/main.c b/src/bin/lttng-relayd/main.c
index 057ac4046..adb044f1d 100644
--- a/src/bin/lttng-relayd/main.c
+++ b/src/bin/lttng-relayd/main.c
@@ -2146,6 +2146,7 @@ static int relay_process_data(struct relay_connection *conn)
 	uint64_t net_seq_num;
 	uint32_t data_size;
 	struct relay_session *session;
+	bool new_stream = false;
 
 	ret = conn->sock->ops->recvmsg(conn->sock, &data_hdr,
 			sizeof(struct lttcomm_relayd_data_hdr), 0);
@@ -2269,10 +2270,19 @@ static int relay_process_data(struct relay_connection *conn)
 	}
 	stream->tracefile_size_current +=
 			data_size + be32toh(data_hdr.padding_size);
+	if (stream->prev_seq == -1ULL) {
+		new_stream = true;
+	}
+
 	stream->prev_seq = net_seq_num;
 
 end_stream_unlock:
 	pthread_mutex_unlock(&stream->lock);
+	if (new_stream) {
+		pthread_mutex_lock(&session->lock);
+		uatomic_set(&session->new_streams, 1);
+		pthread_mutex_unlock(&session->lock);
+	}
 end_stream_put:
 	stream_put(stream);
 end: