+
+enum lttcomm_return_code lttng_consumer_open_channel_packets(
+ struct lttng_consumer_channel *channel)
+{
+ struct lttng_consumer_stream *stream;
+ enum lttcomm_return_code ret = LTTCOMM_CONSUMERD_SUCCESS;
+
+ if (channel->metadata_stream) {
+ ERR("Open channel packets command attempted on a metadata channel");
+ ret = LTTCOMM_CONSUMERD_INVALID_PARAMETERS;
+ goto end;
+ }
+
+ rcu_read_lock();
+ cds_list_for_each_entry(stream, &channel->streams.head, send_node) {
+ enum open_packet_status status;
+
+ pthread_mutex_lock(&stream->lock);
+ if (cds_lfht_is_node_deleted(&stream->node.node)) {
+ goto next;
+ }
+
+ status = open_packet(stream);
+ switch (status) {
+ case OPEN_PACKET_STATUS_OPENED:
+ DBG("Opened a packet in \"open channel packets\" command: stream id = %" PRIu64
+ ", channel name = %s, session id = %" PRIu64,
+ stream->key, stream->chan->name,
+ stream->chan->session_id);
+ stream->opened_packet_in_current_trace_chunk = true;
+ break;
+ case OPEN_PACKET_STATUS_NO_SPACE:
+ DBG("No space left to open a packet in \"open channel packets\" command: stream id = %" PRIu64
+ ", channel name = %s, session id = %" PRIu64,
+ stream->key, stream->chan->name,
+ stream->chan->session_id);
+ break;
+ case OPEN_PACKET_STATUS_ERROR:
+ /*
+ * Only unexpected internal errors can lead to this
+ * failing. Report an unknown error.
+ */
+ ERR("Failed to flush empty buffer in \"open channel packets\" command: stream id = %" PRIu64
+ ", channel id = %" PRIu64
+ ", channel name = %s"
+ ", session id = %" PRIu64,
+ stream->key, channel->key,
+ channel->name, channel->session_id);
+ ret = LTTCOMM_CONSUMERD_UNKNOWN_ERROR;
+ goto error_unlock;
+ default:
+ abort();
+ }
+
+ next:
+ pthread_mutex_unlock(&stream->lock);
+ }
+
+end_rcu_unlock:
+ rcu_read_unlock();
+end:
+ return ret;
+
+error_unlock:
+ pthread_mutex_unlock(&stream->lock);
+ goto end_rcu_unlock;
+}