int (*recv_stream)(struct lttng_consumer_stream *stream),
int (*update_stream)(int sessiond_key, uint32_t state));
void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx);
-int lttng_create_output_file(struct lttng_consumer_stream *stream);
ssize_t lttng_consumer_on_read_subbuffer_mmap(
struct lttng_consumer_local_data *ctx,
struct lttng_consumer_stream *stream, unsigned long len,