* If channel_name is NULL, a lookup of the event's channel is done.
* If both are NULL, the filter is applied to all events of all channels.
*/
extern int lttng_set_event_filter(struct lttng_handle *handle,
* If channel_name is NULL, a lookup of the event's channel is done.
* If both are NULL, the filter is applied to all events of all channels.
*/
extern int lttng_set_event_filter(struct lttng_handle *handle,