Live timer set up

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

diff --git a/src/bin/lttng-sessiond/cmd.c b/src/bin/lttng-sessiond/cmd.c
index e5b2b7e3c8f606677d4bc03adfabf34691b20c52..bed8f830d6e887b79a4c67081ed6edaef1142a16 100644 (file)
--- a/src/bin/lttng-sessiond/cmd.c
+++ b/src/bin/lttng-sessiond/cmd.c
@@ -850,6 +850,25 @@ int cmd_enable_channel(struct ltt_session *session,
 
        rcu_read_lock();
 
+       /*
+        * Don't try to enable a channel if the session has been started at
+        * some point in time before. The tracer does not allow it.
+        */
+       if (session->started) {
+               ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
+               goto error;
+       }
+
+       /*
+        * If the session is a live session, remove the switch timer, the
+        * live timer does the same thing but sends also synchronisation
+        * beacons for inactive streams.
+        */
+       if (session->live_timer > 0) {
+               attr->attr.live_timer_interval = session->live_timer;
+               attr->attr.switch_timer_interval = 0;
+       }
+
        switch (domain->type) {
        case LTTNG_DOMAIN_KERNEL:
        {
@@ -1764,7 +1783,7 @@ error:
  * Command LTTNG_CREATE_SESSION processed by the client thread.
  */
 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
-               size_t nb_uri, lttng_sock_cred *creds)
+               size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
 {
        int ret;
        struct ltt_session *session;
@@ -1802,6 +1821,7 @@ int cmd_create_session_uri(char *name, struct lttng_uri *uris,
        session = session_find_by_name(name);
        assert(session);
 
+       session->live_timer = live_timer;
        /* Create default consumer output for the session not yet created. */
        session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
        if (session->consumer == NULL) {
@@ -1848,7 +1868,7 @@ int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
         * Create session in no output mode with URIs set to NULL. The uris we've
         * received are for a default snapshot output if one.
         */
-       ret = cmd_create_session_uri(name, NULL, 0, creds);
+       ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
        if (ret != LTTNG_OK) {
                goto error;
        }