extern struct lttng_ust_lib_ring_buffer *channel_get_ring_buffer(
const struct lttng_ust_lib_ring_buffer_config *config,
struct lttng_ust_lib_ring_buffer_channel *chan, int cpu,
struct lttng_ust_shm_handle *handle,
int *shm_fd, int *wait_fd,
int *wakeup_fd,
extern struct lttng_ust_lib_ring_buffer *channel_get_ring_buffer(
const struct lttng_ust_lib_ring_buffer_config *config,
struct lttng_ust_lib_ring_buffer_channel *chan, int cpu,
struct lttng_ust_shm_handle *handle,
int *shm_fd, int *wait_fd,
int *wakeup_fd,