-/*
- * Enable event for a channel from a UST session for a specific PID.
- */
-int ust_app_enable_event_pid(struct ltt_ust_session *usess,
- struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
-{
- int ret = 0;
- struct lttng_ht_iter iter;
- struct lttng_ht_node_str *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 enabling event %s for PID %d", uevent->attr.name, pid);
-
- rcu_read_lock();
-
- app = ust_app_find_by_pid(pid);
- if (app == NULL) {
- ERR("UST app enable event per PID %d not found", pid);
- ret = -1;
- goto end;
- }
-
- if (!app->compatible) {
- ret = 0;
- goto end;
- }
-
- ua_sess = lookup_session_by_app(usess, app);
- if (!ua_sess) {
- /* The application has problem or is probably dead. */
- ret = 0;
- goto end;
- }
-
- pthread_mutex_lock(&ua_sess->lock);
-
- if (ua_sess->deleted) {
- ret = 0;
- goto end_unlock;
- }
-
- /* Lookup channel in the ust app session */
- lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
- ua_chan_node = lttng_ht_iter_get_node_str(&iter);
- /* If the channel is not found, there is a code flow error */
- assert(ua_chan_node);
-
- ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
-
- ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
- uevent->filter, uevent->attr.loglevel, uevent->exclusion);
- if (ua_event == NULL) {
- ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
- if (ret < 0) {
- goto end_unlock;
- }
- } else {
- ret = enable_ust_app_event(ua_sess, ua_event, app);
- if (ret < 0) {
- goto end_unlock;
- }
- }
-
-end_unlock:
- pthread_mutex_unlock(&ua_sess->lock);
-end:
- rcu_read_unlock();
- return ret;
-}
-