Implement snapshot commands in lttng-sessiond

[lttng-tools.git] / src / bin / lttng-sessiond / kernel-consumer.c

diff --git a/src/bin/lttng-sessiond/kernel-consumer.c b/src/bin/lttng-sessiond/kernel-consumer.c
index f30c11ccc2fa2be882e77218220b5da7b746ed10..044b1a81f58f19540a527370beadade74a6f297c 100644 (file)
--- a/src/bin/lttng-sessiond/kernel-consumer.c
+++ b/src/bin/lttng-sessiond/kernel-consumer.c
@@ -115,7 +115,7 @@ error:
  * Sending metadata to the consumer with command ADD_CHANNEL and ADD_STREAM.
  */
 int kernel_consumer_add_metadata(struct consumer_socket *sock,
-               struct ltt_kernel_session *session)
+               struct ltt_kernel_session *session, int no_monitor)
 {
        int ret;
        char tmp_path[PATH_MAX];
@@ -195,6 +195,14 @@ int kernel_consumer_add_metadata(struct consumer_socket *sock,
                        session->metadata_stream_fd,
                        0); /* CPU: 0 for metadata. */
 
+       /*
+        * Set the no monitor flag. If set to 1, it indicates the consumer to NOT
+        * monitor the stream but rather add it to a special list in the associated
+        * channel. This is used to handle ephemeral stream used by the snapshot
+        * command or store streams for the flight recorder mode.
+        */
+       lkm.u.stream.no_monitor = no_monitor;
+
        health_code_update();
 
        /* Send stream and file descriptor */
@@ -323,7 +331,7 @@ int kernel_consumer_send_session(struct consumer_socket *sock,
        DBG("Sending session stream to kernel consumer");
 
        if (session->metadata_stream_fd >= 0) {
-               ret = kernel_consumer_add_metadata(sock, session);
+               ret = kernel_consumer_add_metadata(sock, session, 0);
                if (ret < 0) {
                        goto error;
                }