lttng_ret = notification_thread_command_add_tracer_event_source(
notification_thread_handle,
lttng_pipe_get_readfd(app->event_notifier_group.event_pipe),
lttng_ret = notification_thread_command_add_tracer_event_source(
notification_thread_handle,
lttng_pipe_get_readfd(app->event_notifier_group.event_pipe),