int ustctl_put_subbuf(struct lttng_ust_shm_handle *handle,
struct lttng_ust_lib_ring_buffer *buf);
-int ustctl_flush_buffer(struct lttng_ust_shm_handle *handle,
+void ustctl_flush_buffer(struct lttng_ust_shm_handle *handle,
struct lttng_ust_lib_ring_buffer *buf,
int producer_active);