Add disable all UST event(s) command

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

diff --git a/lttng-sessiond/ust-app.c b/lttng-sessiond/ust-app.c
index e5bd47c7d2770721148af4505223823aa14d5d78..e0f907fbd0ff2d42b65f3a01fd4d33d9a33d03ee 100644 (file)
--- a/lttng-sessiond/ust-app.c
+++ b/lttng-sessiond/ust-app.c
@@ -244,6 +244,29 @@ error:
        return NULL;
 }
 
+/*
+ * Disable the specified event on to UST tracer for the UST session.
+ */
+static int disable_ust_event(struct ust_app *app,
+               struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
+{
+       int ret;
+
+       ret = ustctl_disable(app->key.sock, ua_event->obj);
+       if (ret < 0) {
+               ERR("UST app event %s disable failed for app (pid: %d) "
+                               "and session handle %d with ret %d",
+                               ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
+               goto error;
+       }
+
+       DBG2("UST app event %s disabled successfully for app (pid: %d)",
+                       ua_event->attr.name, app->key.pid);
+
+error:
+       return ret;
+}
+
 /*
  * Disable the specified channel on to UST tracer for the UST session.
  */
@@ -704,6 +727,26 @@ error:
        return NULL;
 }
 
+/*
+ * Disable on the tracer side a ust app event for the session and channel.
+ */
+static int disable_ust_app_event(struct ust_app_session *ua_sess,
+               struct ust_app_channel *ua_chan, struct ust_app_event *ua_event,
+               struct ust_app *app)
+{
+       int ret;
+
+       ret = disable_ust_event(app, ua_sess, ua_event);
+       if (ret < 0) {
+               goto error;
+       }
+
+       ua_event->enabled = 0;
+
+error:
+       return ret;
+}
+
 /*
  * Lookup ust app channel for session and disable it on the tracer side.
  */
@@ -1227,6 +1270,60 @@ error:
        return ret;
 }
 
+/*
+ * For a specific UST session and UST channel, create the event for all
+ * registered apps.
+ */
+int ust_app_disable_event_all(struct ltt_ust_session *usess,
+               struct ltt_ust_channel *uchan)
+{
+       int ret = 0;
+       struct cds_lfht_iter iter, uiter;
+       struct cds_lfht_node *ua_chan_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 all event for all apps in channel "
+                       "%s for session uid %d", 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, app->key.pid, usess->uid);
+                       continue;
+               }
+               ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
+
+               /* Disable each events of channel */
+               cds_lfht_for_each_entry(ua_chan->events, &uiter, ua_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, create the channel for all registered apps.
  */