Fix: (slight UI change) refuse missing -c if non-default channel exists

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

diff --git a/src/bin/lttng-sessiond/trace-ust.c b/src/bin/lttng-sessiond/trace-ust.c
index 9eabf6225376360d2eef8e9d83d33b668e84c35e..c80d5e772de8c48e913b5399f23be7af785241c5 100644 (file)
--- a/src/bin/lttng-sessiond/trace-ust.c
+++ b/src/bin/lttng-sessiond/trace-ust.c
@@ -128,6 +128,13 @@ struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
        struct lttng_ht_node_str *node;
        struct lttng_ht_iter iter;
 
+       /*
+        * If we receive an empty string for channel name, it means the
+        * default channel name is requested.
+        */
+       if (name[0] == '\0')
+               name = DEFAULT_CHANNEL_NAME;
+
        lttng_ht_lookup(ht, (void *)name, &iter);
        node = lttng_ht_iter_get_node_str(&iter);
        if (node == NULL) {
@@ -268,8 +275,16 @@ struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan)
                break;
        }
 
-       /* Copy channel name */
-       strncpy(luc->name, chan->name, sizeof(luc->name));
+       /*
+        * If we receive an empty string for channel name, it means the
+        * default channel name is requested.
+        */
+       if (chan->name[0] == '\0') {
+               strncpy(luc->name, DEFAULT_CHANNEL_NAME, sizeof(luc->name));
+       } else {
+               /* Copy channel name */
+               strncpy(luc->name, chan->name, sizeof(luc->name));
+       }
        luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
 
        /* Init node */