+ /*
+ * This session is in snapshot mode. This means that channels enabled
+ * will be set in overwrite mode by default and must be in mmap
+ * output mode. Note that snapshots can be taken on a session that
+ * is not in "snapshot_mode". This parameter only affects channel
+ * creation defaults.
+ */
+ unsigned int snapshot_mode;
+ /*
+ * A session that has channels that don't use 'mmap' output can't be
+ * used to capture snapshots. This is set to true whenever a
+ * 'splice' kernel channel is enabled.
+ */
+ bool has_non_mmap_channel;
+ /*
+ * Timer set when the session is created for live reading.
+ */
+ unsigned int live_timer;
+ /*
+ * Path where to keep the shared memory files.
+ */
+ char shm_path[PATH_MAX];
+ /*
+ * Node in ltt_sessions_ht_by_id.
+ */
+ struct lttng_ht_node_u64 node;
+ /*
+ * The current archive id corresponds to the number of session rotations
+ * that have occurred for this session. The archive id
+ * is used to tag the "generation" of a stream. This tag allows the
+ * consumer and relay daemons to track when a given stream was created
+ * during the lifetime of a session.
+ *
+ * For instance, if a stream is created after a session rotation was
+ * launched, the consumer and relay daemons must not check its position
+ * to determine if that specific session rotation was completed. It is
+ * implicitly "completed" since the stream appeared _after_ the session
+ * rotation was initiated.
+ */
+ uint64_t current_archive_id;
+ /*
+ * Rotation is considered pending between the time it is launched up
+ * until the moment when the data has been writen at the destination
+ * and the trace archive has been renamed.
+ *
+ * When tracing locally, only 'rotation_pending_local' is used since
+ * no remote checks are needed. However, when tracing to a relay daemon,
+ * a second check is needed to ensure that the data has been
+ * commited at the remote destination.
+ */
+ bool rotation_pending_local;
+ bool rotation_pending_relay;
+ /* Current state of a rotation. */
+ enum lttng_rotation_state rotation_state;
+ struct {
+ /*
+ * When the rotation is in progress, the temporary path name is
+ * stored here. When the rotation is complete, the final path name
+ * is here and can be queried with the rotate_pending call.
+ */
+ char current_rotate_path[LTTNG_PATH_MAX];
+ /*
+ * The path where the consumer is currently writing after the first
+ * session rotation.
+ */
+ char active_tracing_path[LTTNG_PATH_MAX];
+ } rotation_chunk;
+ /*
+ * The timestamp of the beginning of the previous chunk. For the
+ * first chunk, this is the "lttng start" timestamp. For the
+ * subsequent ones, this copies the current_chunk_start_ts value when
+ * a new rotation starts. This value is used to set the name of a
+ * complete chunk directory, ex: "last_chunk_start_ts-now()".
+ */
+ time_t last_chunk_start_ts;
+ /*
+ * This is the timestamp when a new chunk starts. When a new rotation
+ * starts, we copy this value to last_chunk_start_ts and replace it
+ * with the current timestamp.
+ */
+ time_t current_chunk_start_ts;
+ /*
+ * Timer to check periodically if a relay and/or consumer has completed
+ * the last rotation.
+ */
+ bool rotation_pending_check_timer_enabled;
+ timer_t rotation_pending_check_timer;
+ /* Timer to periodically rotate a session. */
+ bool rotation_schedule_timer_enabled;
+ timer_t rotation_schedule_timer;
+ /* Value for periodic rotations, 0 if disabled. */
+ uint64_t rotate_timer_period;
+ /* Value for size-based rotations, 0 if disabled. */
+ uint64_t rotate_size;
+ /*
+ * Keep a state if this session was rotated after the last stop command.
+ * We only allow one rotation after a stop. At destroy, we also need to
+ * know if a rotation occurred since the last stop to rename the current
+ * chunk.
+ */
+ bool rotated_after_last_stop;
+ /*
+ * Condition and trigger for size-based rotations.
+ */
+ struct lttng_condition *rotate_condition;
+ struct lttng_trigger *rotate_trigger;