+ return cmd_ret;
+}
+
+/*
+ * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
+ */
+int cmd_set_session_shm_path(struct ltt_session *session,
+ const char *shm_path)
+{
+ /* Safety net */
+ assert(session);
+
+ /*
+ * Can only set shm path before session is started.
+ */
+ if (session->has_been_started) {
+ return LTTNG_ERR_SESSION_STARTED;
+ }
+
+ strncpy(session->shm_path, shm_path,
+ sizeof(session->shm_path));
+ session->shm_path[sizeof(session->shm_path) - 1] = '\0';
+
+ return 0;
+}
+
+/*
+ * Command LTTNG_ROTATE_SESSION from the lttng-ctl library.
+ *
+ * Ask the consumer to rotate the session output directory.
+ * The session lock must be held.
+ *
+ * Returns LTTNG_OK on success or else a negative LTTng error code.
+ */
+int cmd_rotate_session(struct ltt_session *session,
+ struct lttng_rotate_session_return *rotate_return)
+{
+ int ret;
+ enum lttng_error_code cmd_ret = LTTNG_OK;
+ size_t strf_ret;
+ struct tm *timeinfo;
+ char datetime[21];
+ time_t now;
+ /*
+ * Used to roll-back timestamps in case of failure to launch the
+ * rotation.
+ */
+ time_t original_last_chunk_start_ts, original_current_chunk_start_ts;
+
+ assert(session);
+
+ if (!session->has_been_started) {
+ cmd_ret = LTTNG_ERR_START_SESSION_ONCE;
+ goto end;
+ }
+
+ if (session->live_timer || !session->output_traces) {
+ cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE;
+ goto end;
+ }
+
+ /*
+ * Unsupported feature in lttng-relayd before 2.11.
+ */
+ if (session->consumer->type == CONSUMER_DST_NET &&
+ (session->consumer->relay_major_version == 2 &&
+ session->consumer->relay_minor_version < 11)) {
+ cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY;
+ goto end;
+ }
+
+ if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
+ DBG("Refusing to launch a rotation; a rotation is already in progress for session %s",
+ session->name);
+ cmd_ret = LTTNG_ERR_ROTATION_PENDING;
+ goto end;
+ }
+
+ /*
+ * After a stop, we only allow one rotation to occur, the other ones are
+ * useless until a new start.
+ */
+ if (session->rotated_after_last_stop) {
+ DBG("Session \"%s\" was already rotated after stop, refusing rotation",
+ session->name);
+ cmd_ret = LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP;
+ goto end;
+ }
+
+ /* Special case for the first rotation. */
+ if (session->current_archive_id == 0) {
+ const char *base_path = NULL;
+
+ assert(session->kernel_session || session->ust_session);
+ /* Either one of the two sessions is enough to get the root path. */
+ base_path = session_get_base_path(session);
+ assert(base_path);
+
+ ret = lttng_strncpy(session->rotation_chunk.current_rotate_path,
+ base_path,
+ sizeof(session->rotation_chunk.current_rotate_path));
+ if (ret) {
+ ERR("Failed to copy session base path to current rotation chunk path");
+ cmd_ret = LTTNG_ERR_UNK;
+ goto end;
+ }
+ } else {
+ /*
+ * The currently active tracing path is now the folder we
+ * want to rotate.
+ */
+ ret = lttng_strncpy(session->rotation_chunk.current_rotate_path,
+ session->rotation_chunk.active_tracing_path,
+ sizeof(session->rotation_chunk.current_rotate_path));
+ if (ret) {
+ ERR("Failed to copy the active tracing path to the current rotate path");
+ cmd_ret = LTTNG_ERR_UNK;
+ goto end;
+ }
+ }
+ DBG("Current rotate path %s", session->rotation_chunk.current_rotate_path);
+
+ /*
+ * Channels created after this point will belong to the next
+ * archive id.
+ */
+ session->current_archive_id++;
+
+ now = time(NULL);
+ if (now == (time_t) -1) {
+ cmd_ret = LTTNG_ERR_UNK;
+ goto end;
+ }
+
+ /* Sample chunk bounds for roll-back in case of error. */
+ original_last_chunk_start_ts = session->last_chunk_start_ts;
+ original_current_chunk_start_ts = session->current_chunk_start_ts;
+
+ session->last_chunk_start_ts = session->current_chunk_start_ts;
+ session->current_chunk_start_ts = now;
+
+ timeinfo = localtime(&now);
+ if (!timeinfo) {
+ PERROR("Failed to sample local time in rotate session command");
+ cmd_ret = LTTNG_ERR_UNK;
+ goto end;
+ }
+ strf_ret = strftime(datetime, sizeof(datetime), "%Y%m%dT%H%M%S%z",
+ timeinfo);
+ if (!strf_ret) {
+ ERR("Failed to format local time timestamp in rotate session command");
+ cmd_ret = LTTNG_ERR_UNK;
+ goto end;
+ }
+
+ /*
+ * A rotation has a local step even if the destination is a relay
+ * daemon; the buffers must be consumed by the consumer daemon.
+ */
+ session->rotation_pending_local = true;
+ session->rotation_pending_relay =
+ session_get_consumer_destination_type(session) == CONSUMER_DST_NET;
+ session->rotation_state = LTTNG_ROTATION_STATE_ONGOING;
+
+ if (session->kernel_session) {
+ /*
+ * The active path for the next rotation/destroy.
+ * Ex: ~/lttng-traces/auto-20170922-111748/20170922-111754-42
+ */
+ ret = snprintf(session->rotation_chunk.active_tracing_path,
+ sizeof(session->rotation_chunk.active_tracing_path),
+ "%s/%s-%" PRIu64,
+ session_get_base_path(session),
+ datetime, session->current_archive_id + 1);
+ if (ret < 0 || ret == sizeof(session->rotation_chunk.active_tracing_path)) {
+ ERR("Failed to format active kernel tracing path in rotate session command");
+ cmd_ret = LTTNG_ERR_UNK;
+ goto error;
+ }
+ /*
+ * The sub-directory for the consumer
+ * Ex: /20170922-111754-42/kernel
+ */
+ ret = snprintf(session->kernel_session->consumer->chunk_path,
+ sizeof(session->kernel_session->consumer->chunk_path),
+ "/%s-%" PRIu64, datetime,
+ session->current_archive_id + 1);
+ if (ret < 0 || ret == sizeof(session->kernel_session->consumer->chunk_path)) {
+ ERR("Failed to format the kernel consumer's sub-directory in rotate session command");
+ cmd_ret = LTTNG_ERR_UNK;
+ goto error;
+ }
+ /*
+ * Create the new chunk folder, before the rotation begins so we don't
+ * race with the consumer/tracer activity.
+ */
+ ret = domain_mkdir(session->kernel_session->consumer, session,
+ session->kernel_session->uid,
+ session->kernel_session->gid);
+ if (ret) {
+ ERR("Failed to create kernel session tracing path at %s",
+ session->kernel_session->consumer->chunk_path);
+ cmd_ret = LTTNG_ERR_CREATE_DIR_FAIL;
+ goto error;
+ }
+ cmd_ret = kernel_rotate_session(session);
+ if (cmd_ret != LTTNG_OK) {
+ goto error;
+ }
+ }
+ if (session->ust_session) {
+ ret = snprintf(session->rotation_chunk.active_tracing_path,
+ PATH_MAX, "%s/%s-%" PRIu64,
+ session_get_base_path(session),
+ datetime, session->current_archive_id + 1);
+ if (ret < 0) {
+ ERR("Failed to format active UST tracing path in rotate session command");
+ cmd_ret = LTTNG_ERR_UNK;
+ goto error;
+ }
+ ret = snprintf(session->ust_session->consumer->chunk_path,
+ PATH_MAX, "/%s-%" PRIu64, datetime,
+ session->current_archive_id + 1);
+ if (ret < 0) {
+ ERR("Failed to format the UST consumer's sub-directory in rotate session command");
+ cmd_ret = LTTNG_ERR_UNK;
+ goto error;
+ }
+ /*
+ * Create the new chunk folder, before the rotation begins so we don't
+ * race with the consumer/tracer activity.
+ */
+ ret = domain_mkdir(session->ust_session->consumer, session,
+ session->ust_session->uid,
+ session->ust_session->gid);
+ if (ret) {
+ cmd_ret = LTTNG_ERR_CREATE_DIR_FAIL;
+ goto error;
+ }
+ cmd_ret = ust_app_rotate_session(session);
+ if (cmd_ret != LTTNG_OK) {
+ goto error;
+ }
+ }
+
+ ret = timer_session_rotation_pending_check_start(session,
+ DEFAULT_ROTATE_PENDING_TIMER);
+ if (ret) {
+ cmd_ret = LTTNG_ERR_UNK;
+ goto error;
+ }
+
+ if (!session->active) {
+ session->rotated_after_last_stop = true;
+ }
+
+ if (rotate_return) {
+ rotate_return->rotation_id = session->current_archive_id;
+ }
+
+ ret = notification_thread_command_session_rotation_ongoing(
+ notification_thread_handle,
+ session->name, session->uid, session->gid,
+ session->current_archive_id - 1);
+ if (ret != LTTNG_OK) {
+ ERR("Failed to notify notification thread that a session rotation is ongoing for session %s",
+ session->name);
+ cmd_ret = ret;
+ }
+
+ DBG("Cmd rotate session %s, archive_id %" PRIu64 " sent",
+ session->name, session->current_archive_id - 1);
+end:
+ ret = (cmd_ret == LTTNG_OK) ? cmd_ret : -((int) cmd_ret);
+ return ret;
+error:
+ session->last_chunk_start_ts = original_last_chunk_start_ts;
+ session->current_archive_id = original_current_chunk_start_ts;
+ if (session_reset_rotation_state(session,
+ LTTNG_ROTATION_STATE_NO_ROTATION)) {
+ ERR("Failed to reset rotation state of session \"%s\"",
+ session->name);
+ }
+ goto end;
+}
+
+/*
+ * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library.
+ *
+ * Check if the session has finished its rotation.
+ *
+ * Return 0 on success or else a LTTNG_ERR code.
+ */
+int cmd_rotate_get_info(struct ltt_session *session,
+ struct lttng_rotation_get_info_return *info_return,
+ uint64_t rotation_id)
+{
+ int ret;
+
+ assert(session);
+
+ DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64, session->name,
+ session->current_archive_id);
+
+ if (session->current_archive_id != rotation_id) {
+ info_return->status = (int32_t) LTTNG_ROTATION_STATE_EXPIRED;
+ ret = LTTNG_OK;
+ goto end;
+ }
+
+ switch (session->rotation_state) {
+ case LTTNG_ROTATION_STATE_ONGOING:
+ DBG("Reporting that rotation id %" PRIu64 " of session %s is still pending",
+ rotation_id, session->name);
+ break;
+ case LTTNG_ROTATION_STATE_COMPLETED:
+ {
+ char *current_tracing_path_reply;
+ size_t current_tracing_path_reply_len;
+
+ switch (session_get_consumer_destination_type(session)) {
+ case CONSUMER_DST_LOCAL:
+ current_tracing_path_reply =
+ info_return->location.local.absolute_path;
+ current_tracing_path_reply_len =
+ sizeof(info_return->location.local.absolute_path);
+ info_return->location_type =
+ (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL;
+ break;
+ case CONSUMER_DST_NET:
+ current_tracing_path_reply =
+ info_return->location.relay.relative_path;
+ current_tracing_path_reply_len =
+ sizeof(info_return->location.relay.relative_path);
+ /* Currently the only supported relay protocol. */
+ info_return->location.relay.protocol =
+ (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP;
+
+ ret = lttng_strncpy(info_return->location.relay.host,
+ session_get_net_consumer_hostname(session),
+ sizeof(info_return->location.relay.host));
+ if (ret) {
+ ERR("Failed to host name to rotate_get_info reply");
+ info_return->status = LTTNG_ROTATION_STATUS_ERROR;
+ ret = -LTTNG_ERR_UNK;
+ goto end;
+ }
+
+ session_get_net_consumer_ports(session,
+ &info_return->location.relay.ports.control,
+ &info_return->location.relay.ports.data);
+ info_return->location_type =
+ (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY;
+ break;
+ default:
+ abort();
+ }
+ ret = lttng_strncpy(current_tracing_path_reply,
+ session->rotation_chunk.current_rotate_path,
+ current_tracing_path_reply_len);
+ if (ret) {
+ ERR("Failed to copy current tracing path to rotate_get_info reply");
+ info_return->status = LTTNG_ROTATION_STATUS_ERROR;
+ ret = -LTTNG_ERR_UNK;
+ goto end;
+ }
+
+ break;
+ }
+ case LTTNG_ROTATION_STATE_ERROR:
+ DBG("Reporting that an error occurred during rotation %" PRIu64 " of session %s",
+ rotation_id, session->name);
+ break;
+ default:
+ abort();
+ }
+
+ info_return->status = (int32_t) session->rotation_state;
+ ret = LTTNG_OK;
+end: