+ if (opt_filter) {
+ ret = lttng_set_event_filter(handle, ev.name, channel_name,
+ opt_filter);
+ if (ret < 0) {
+ switch (-ret) {
+ case LTTNG_ERR_FILTER_EXIST:
+ WARN("Filter on events is already enabled"
+ " (channel %s, session %s)",
+ channel_name, session_name);
+ break;
+ case LTTNG_ERR_FILTER_INVAL:
+ case LTTNG_ERR_FILTER_NOMEM:
+ ERR("%s", lttng_strerror(ret));
+ default:
+ ERR("Setting filter: '%s'", opt_filter);
+ /*
+ * The event was successfully enabled before so when
+ * failing to set a filter, disable the event. This has
+ * been discussed in bug #343 on why we do that.
+ */
+ err = lttng_disable_event(handle, ev.name, channel_name);
+ if (err < 0) {
+ ERR("Disabling all events after filter error: %s",
+ lttng_strerror(err));
+ } else {
+ WARN("All events of channel %s have been disabled due "
+ "to a filter error", channel_name);
+ }
+ break;
+ }
+ goto error;
+ } else {
+ MSG("Filter '%s' successfully set", opt_filter);
+ }
+ }