Fix: Don't report an error when listing a session with no channels

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

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index 1ee6f4a9f658f4cc547860ce5ac9f91a85c6e878..36c99cda17fab631e89aee0fcde9ffdbf9e64518 100644 (file)
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -1113,7 +1113,7 @@ static void signal_consumer_condition(struct consumer_data *data, int state)
  */
 static void *thread_manage_consumer(void *data)
 {
-       int sock = -1, i, ret, pollfd, err = -1;
+       int sock = -1, i, ret, pollfd, err = -1, should_quit = 0;
        uint32_t revents, nb_fd;
        enum lttcomm_return_code code;
        struct lttng_poll_event events;
@@ -1271,6 +1271,15 @@ restart:
        /* Infinite blocking call, waiting for transmission */
 restart_poll:
        while (1) {
+               health_code_update();
+
+               /* Exit the thread because the thread quit pipe has been triggered. */
+               if (should_quit) {
+                       /* Not a health error. */
+                       err = 0;
+                       goto exit;
+               }
+
                health_poll_entry();
                ret = lttng_poll_wait(&events, -1);
                health_poll_exit();
@@ -1293,12 +1302,12 @@ restart_poll:
 
                        health_code_update();
 
-                       /* Thread quit pipe has been closed. Killing thread. */
-                       ret = sessiond_check_thread_quit_pipe(pollfd, revents);
-                       if (ret) {
-                               err = 0;
-                               goto exit;
-                       }
+                       /*
+                        * Thread quit pipe has been triggered, flag that we should stop
+                        * but continue the current loop to handle potential data from
+                        * consumer.
+                        */
+                       should_quit = sessiond_check_thread_quit_pipe(pollfd, revents);
 
                        if (pollfd == sock) {
                                /* Event on the consumerd socket */
@@ -1327,11 +1336,8 @@ restart_poll:
                                        ERR("Handling metadata request");
                                        goto error;
                                }
-                               break;
-                       } else {
-                               ERR("Unknown pollfd");
-                               goto error;
                        }
+                       /* No need for an else branch all FDs are tested prior. */
                }
                health_code_update();
        }
@@ -3466,7 +3472,7 @@ skip_domain:
        case LTTNG_LIST_CHANNELS:
        {
                int nb_chan;
-               struct lttng_channel *channels;
+               struct lttng_channel *channels = NULL;
 
                nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
                                cmd_ctx->session, &channels);