int (*recv_channel)(struct lttng_consumer_channel *channel),
int (*recv_stream)(struct lttng_consumer_stream *stream),
int (*update_stream)(int sessiond_key, uint32_t state));
int (*recv_channel)(struct lttng_consumer_channel *channel),
int (*recv_stream)(struct lttng_consumer_stream *stream),
int (*update_stream)(int sessiond_key, uint32_t state));