+ struct {
+ uint64_t key; /* Metadata channel key. */
+ uint64_t target_offset; /* Offset in the consumer */
+ uint64_t len; /* Length of metadata to be received. */
+ uint64_t version; /* Version of the metadata. */
+ } LTTNG_PACKED push_metadata;
+ struct {
+ uint64_t key; /* Metadata channel key. */
+ } LTTNG_PACKED close_metadata;
+ struct {
+ uint64_t key; /* Metadata channel key. */
+ } LTTNG_PACKED setup_metadata;
+ struct {
+ uint64_t key; /* Channel key. */
+ } LTTNG_PACKED flush_channel;
+ struct {
+ uint64_t key; /* Channel key. */
+ } LTTNG_PACKED clear_quiescent_channel;
+ struct {
+ char pathname[PATH_MAX];
+ /* Indicate if the snapshot goes on the relayd or locally. */
+ uint32_t use_relayd;
+ uint32_t metadata; /* This a metadata snapshot. */
+ uint64_t relayd_id; /* Relayd id if apply. */
+ uint64_t key;
+ uint64_t nb_packets_per_stream;
+ } LTTNG_PACKED snapshot_channel;
+ struct {
+ uint64_t channel_key;
+ uint64_t net_seq_idx;
+ } LTTNG_PACKED sent_streams;
+ struct {
+ uint64_t session_id;
+ uint64_t channel_key;
+ } LTTNG_PACKED discarded_events;
+ struct {
+ uint64_t session_id;
+ uint64_t channel_key;
+ } LTTNG_PACKED lost_packets;
+ struct {
+ uint64_t session_id;
+ } LTTNG_PACKED regenerate_metadata;
+ struct {
+ uint32_t metadata; /* This is a metadata channel. */
+ uint64_t relayd_id; /* Relayd id if apply. */
+ uint64_t key;
+ } LTTNG_PACKED rotate_channel;
+ struct {
+ uint64_t session_id;
+ uint64_t chunk_id;
+ } LTTNG_PACKED check_rotation_pending_local;
+ struct {
+ uint64_t relayd_id;
+ uint64_t session_id;
+ uint64_t chunk_id;
+ } LTTNG_PACKED check_rotation_pending_relay;
+ struct {
+ /*
+ * Relayd id, if applicable (remote).
+ *
+ * A directory file descriptor referring to the chunk's
+ * output folder is transmitted if the chunk is local
+ * (relayd_id unset).
+ *
+ * `override_name` is left NULL (all-zeroes) if the
+ * chunk's name is not overriden.
+ */
+ LTTNG_OPTIONAL(uint64_t) LTTNG_PACKED relayd_id;
+ char override_name[LTTNG_NAME_MAX];
+ uint64_t session_id;
+ uint64_t chunk_id;
+ uint64_t creation_timestamp;
+ struct {
+ uint32_t uid;
+ uint32_t gid;
+ } LTTNG_PACKED credentials;
+ } LTTNG_PACKED create_trace_chunk;
+ struct {
+ LTTNG_OPTIONAL(uint64_t) LTTNG_PACKED relayd_id;
+ uint64_t session_id;
+ uint64_t chunk_id;
+ uint64_t close_timestamp;
+ } LTTNG_PACKED close_trace_chunk;
+ struct {
+ LTTNG_OPTIONAL(uint64_t) LTTNG_PACKED relayd_id;
+ uint64_t session_id;
+ uint64_t chunk_id;
+ } LTTNG_PACKED trace_chunk_exists;
+ struct {
+ lttng_uuid sessiond_uuid;
+ } LTTNG_PACKED init;