+ return default_event_name;
+}
+
+
+/*
+ * Disable a single agent event for a given UST session.
+ *
+ * Return LTTNG_OK on success or else a LTTNG_ERR* code.
+ */
+int event_agent_disable(struct ltt_ust_session *usess, struct agent *agt,
+ char *event_name)
+{
+ int ret;
+ struct agent_event *aevent;
+ struct ltt_ust_event *uevent = NULL;
+ struct ltt_ust_channel *uchan = NULL;
+ const char *ust_event_name, *ust_channel_name;
+
+ assert(agt);
+ assert(usess);
+ assert(event_name);
+
+ DBG("Event agent disabling %s for session %" PRIu64, event_name, usess->id);
+
+ aevent = agent_find_event_by_name(event_name, agt);
+ if (!aevent) {
+ ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
+ goto error;
+ }
+
+ /* Already disabled? */
+ if (!aevent->enabled) {
+ goto end;
+ }
+
+ if (agt->domain == LTTNG_DOMAIN_JUL) {
+ ust_channel_name = DEFAULT_JUL_CHANNEL_NAME;
+ } else if (agt->domain == LTTNG_DOMAIN_LOG4J) {
+ ust_channel_name = DEFAULT_LOG4J_CHANNEL_NAME;
+ } else {
+ ret = LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ /*
+ * Disable it on the UST side. First get the channel reference then find
+ * the event and finally disable it.
+ */
+ uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
+ (char *) ust_channel_name);
+ if (!uchan) {
+ ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ ust_event_name = event_get_default_agent_ust_name(agt->domain);
+ if (!ust_event_name) {
+ ret = LTTNG_ERR_FATAL;
+ goto error;
+ }
+
+ /*
+ * The loglevel is hardcoded with 0 here since the agent ust event is set
+ * with the loglevel type to ALL thus the loglevel stays 0. The event's
+ * filter is the one handling the loglevel for agent.
+ */
+ uevent = trace_ust_find_event(uchan->events, (char *) ust_event_name,
+ aevent->filter, 0, NULL);
+ /* If the agent event exists, it must be available on the UST side. */
+ assert(uevent);
+
+ ret = ust_app_disable_event_glb(usess, uchan, uevent);
+ if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
+ ret = LTTNG_ERR_UST_DISABLE_FAIL;
+ goto error;
+ }
+
+ /*
+ * Flag event that it's disabled so the shadow copy on the ust app side
+ * will disable it if an application shows up.
+ */
+ uevent->enabled = 0;
+
+ ret = agent_disable_event(aevent, agt->domain);
+ if (ret != LTTNG_OK) {
+ goto error;