Add single disable UST event support

[lttng-tools.git] / lttng-sessiond / ust-app.c

diff --git a/lttng-sessiond/ust-app.c b/lttng-sessiond/ust-app.c
index e0f907fbd0ff2d42b65f3a01fd4d33d9a33d03ee..d36cf8893535a24f8583638e25f342b2e33f05b7 100644 (file)
--- a/lttng-sessiond/ust-app.c
+++ b/lttng-sessiond/ust-app.c
@@ -1270,6 +1270,64 @@ error:
        return ret;
 }
 
+/*
+ * Disable an event in a channel and for a specific session.
+ */
+int ust_app_disable_event(struct ltt_ust_session *usess,
+               struct ltt_ust_channel *uchan, char *event_name)
+{
+       int ret = 0;
+       struct cds_lfht_iter iter, uiter;
+       struct cds_lfht_node *ua_chan_node, *ua_event_node;
+       struct ust_app *app;
+       struct ust_app_session *ua_sess;
+       struct ust_app_channel *ua_chan;
+       struct ust_app_event *ua_event;
+
+       DBG("UST app disabling event %s for all apps in channel "
+                       "%s for session uid %d", event_name, uchan->name, usess->uid);
+
+       rcu_read_lock();
+
+       /* For all registered applications */
+       cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+               ua_sess = lookup_session_by_app(usess, app);
+               if (ua_sess == NULL) {
+                       /* Next app */
+                       continue;
+               }
+
+               /* Lookup channel in the ust app session */
+               ua_chan_node = hashtable_lookup(ua_sess->channels,
+                               (void *)uchan->name, strlen(uchan->name), &uiter);
+               if (ua_chan_node == NULL) {
+                       DBG2("Channel %s not found in session uid %d for app pid %d."
+                                       "Skipping", uchan->name, usess->uid, app->key.pid);
+                       continue;
+               }
+               ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
+
+               ua_event_node = hashtable_lookup(ua_chan->events,
+                               (void *) event_name, strlen(event_name), &uiter);
+               if (ua_event_node == NULL) {
+                       DBG2("Event %s not found in channel %s for app pid %d."
+                                       "Skipping", event_name, uchan->name, app->key.pid);
+                       continue;
+               }
+               ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
+
+               ret = disable_ust_app_event(ua_sess, ua_chan, ua_event, app);
+               if (ret < 0) {
+                       /* XXX: Report error someday... */
+                       continue;
+               }
+       }
+
+       rcu_read_unlock();
+
+       return ret;
+}
+
 /*
  * For a specific UST session and UST channel, create the event for all
  * registered apps.