X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fcmd.c;h=6722341bb4b1be79f11a88b96c8989a3cf15e734;hp=803a88090c95d28a733f7e04614238c830980055;hb=462ae7ae036d5f0b4be820345f324e77f5b607c1;hpb=366a9222abc182bf77de1b806256aa9a9dc8832a

diff --git a/src/bin/lttng-sessiond/cmd.c b/src/bin/lttng-sessiond/cmd.c
index 803a88090..6722341bb 100644
--- a/src/bin/lttng-sessiond/cmd.c
+++ b/src/bin/lttng-sessiond/cmd.c
@@ -36,6 +36,7 @@
 #include <lttng/action/action.h>
 #include <lttng/channel.h>
 #include <lttng/channel-internal.h>
+#include <lttng/rotate-internal.h>
 #include <common/string-utils/string-utils.h>
 
 #include "channel.h"
@@ -46,11 +47,15 @@
 #include "kernel-consumer.h"
 #include "lttng-sessiond.h"
 #include "utils.h"
-#include "syscall.h"
+#include "lttng-syscall.h"
 #include "agent.h"
 #include "buffer-registry.h"
 #include "notification-thread.h"
 #include "notification-thread-commands.h"
+#include "rotate.h"
+#include "rotation-thread.h"
+#include "sessiond-timer.h"
+#include "agent-thread.h"
 
 #include "cmd.h"
 
@@ -913,8 +918,8 @@ error:
  *
  * The consumer socket lock must be held by the caller.
  */
-static int send_consumer_relayd_socket(enum lttng_domain_type domain,
-		unsigned int session_id, struct lttng_uri *relayd_uri,
+static int send_consumer_relayd_socket(unsigned int session_id,
+		struct lttng_uri *relayd_uri,
 		struct consumer_output *consumer,
 		struct consumer_socket *consumer_sock,
 		char *session_name, char *hostname, int session_live_timer)
@@ -999,7 +1004,7 @@ static int send_consumer_relayd_sockets(enum lttng_domain_type domain,
 
 	/* Sending control relayd socket. */
 	if (!sock->control_sock_sent) {
-		ret = send_consumer_relayd_socket(domain, session_id,
+		ret = send_consumer_relayd_socket(session_id,
 				&consumer->dst.net.control, consumer, sock,
 				session_name, hostname, session_live_timer);
 		if (ret != LTTNG_OK) {
@@ -1009,7 +1014,7 @@ static int send_consumer_relayd_sockets(enum lttng_domain_type domain,
 
 	/* Sending data relayd socket. */
 	if (!sock->data_sock_sent) {
-		ret = send_consumer_relayd_socket(domain, session_id,
+		ret = send_consumer_relayd_socket(session_id,
 				&consumer->dst.net.data, consumer, sock,
 				session_name, hostname, session_live_timer);
 		if (ret != LTTNG_OK) {
@@ -1148,7 +1153,7 @@ static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
 	}
 
 	/* Quiescent wait after starting trace */
-	kernel_wait_quiescent(kernel_tracer_fd);
+	kernel_wait_quiescent(wpipe);
 
 	ksess->active = 1;
 
@@ -1380,9 +1385,15 @@ int cmd_enable_channel(struct ltt_session *session,
 		break;
 	}
 	case LTTNG_DOMAIN_UST:
+		break;
 	case LTTNG_DOMAIN_JUL:
 	case LTTNG_DOMAIN_LOG4J:
 	case LTTNG_DOMAIN_PYTHON:
+		if (!agent_tracing_is_enabled()) {
+			DBG("Attempted to enable a channel in an agent domain but the agent thread is not running");
+			ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
+			goto error;
+		}
 		break;
 	default:
 		ret = LTTNG_ERR_UNKNOWN_DOMAIN;
@@ -2090,6 +2101,12 @@ static int _cmd_enable_event(struct ltt_session *session,
 
 		assert(usess);
 
+		if (!agent_tracing_is_enabled()) {
+			DBG("Attempted to enable an event in an agent domain but the agent thread is not running");
+			ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
+			goto error;
+		}
+
 		agt = trace_ust_find_agent(usess, domain->type);
 		if (!agt) {
 			agt = agent_create(domain->type);
@@ -2373,6 +2390,113 @@ error:
 	return -ret;
 }
 
+static
+int domain_mkdir(const struct consumer_output *output,
+		const struct ltt_session *session,
+		uid_t uid, gid_t gid)
+{
+	struct consumer_socket *socket;
+	struct lttng_ht_iter iter;
+	int ret;
+	char *path = NULL;
+
+	if (!output || !output->socks) {
+		ERR("No consumer output found");
+		ret = -1;
+		goto end;
+	}
+
+	path = zmalloc(LTTNG_PATH_MAX * sizeof(char));
+	if (!path) {
+		ERR("Cannot allocate mkdir path");
+		ret = -1;
+		goto end;
+	}
+
+	ret = snprintf(path, LTTNG_PATH_MAX, "%s%s%s",
+			session_get_base_path(session),
+			output->chunk_path, output->subdir);
+	if (ret < 0 || ret >= LTTNG_PATH_MAX) {
+		ERR("Format path");
+		ret = -1;
+		goto end;
+	}
+
+	DBG("Domain mkdir %s for session %" PRIu64, path, session->id);
+	rcu_read_lock();
+	/*
+	 * We have to iterate to find a socket, but we only need to send the
+	 * rename command to one consumer, so we break after the first one.
+	 */
+	cds_lfht_for_each_entry(output->socks->ht, &iter.iter, socket, node.node) {
+		pthread_mutex_lock(socket->lock);
+		ret = consumer_mkdir(socket, session->id, output, path, uid, gid);
+		pthread_mutex_unlock(socket->lock);
+		if (ret) {
+			ERR("Consumer mkdir");
+			ret = -1;
+			goto end_unlock;
+		}
+		break;
+	}
+
+	ret = 0;
+
+end_unlock:
+	rcu_read_unlock();
+end:
+	free(path);
+	return ret;
+}
+
+static
+int session_mkdir(const struct ltt_session *session)
+{
+	int ret;
+	struct consumer_output *output;
+	uid_t uid;
+	gid_t gid;
+
+	/*
+	 * Unsupported feature in lttng-relayd before 2.11, not an error since it
+	 * is only needed for session rotation and the user will get an error
+	 * on rotate.
+	 */
+	if (session->consumer->type == CONSUMER_DST_NET &&
+			session->consumer->relay_major_version == 2 &&
+			session->consumer->relay_minor_version < 11) {
+		ret = 0;
+		goto end;
+	}
+
+	if (session->kernel_session) {
+		output = session->kernel_session->consumer;
+		uid = session->kernel_session->uid;
+		gid = session->kernel_session->gid;
+		ret = domain_mkdir(output, session, uid, gid);
+		if (ret) {
+			ERR("Mkdir kernel");
+			goto end;
+		}
+	}
+
+	if (session->ust_session) {
+		output = session->ust_session->consumer;
+		uid = session->ust_session->uid;
+		gid = session->ust_session->gid;
+		ret = domain_mkdir(output, session, uid, gid);
+		if (ret) {
+			ERR("Mkdir UST");
+			goto end;
+		}
+	}
+
+	ret = 0;
+
+end:
+	return ret;
+}
+
 /*
  * Command LTTNG_START_TRACE processed by the client thread.
  *
@@ -2412,8 +2536,31 @@ int cmd_start_trace(struct ltt_session *session)
 		goto error;
 	}
 
+	/*
+	 * Record the timestamp of the first time the session is started for
+	 * an eventual session rotation call.
+	 */
+	if (!session->has_been_started) {
+		session->current_chunk_start_ts = time(NULL);
+		if (session->current_chunk_start_ts == (time_t) -1) {
+			PERROR("Failed to retrieve the \"%s\" session's start time",
+					session->name);
+			ret = LTTNG_ERR_FATAL;
+			goto error;
+		}
+		if (!session->snapshot_mode && session->output_traces) {
+			ret = session_mkdir(session);
+			if (ret) {
+				ERR("Failed to create the session directories");
+				ret = LTTNG_ERR_CREATE_DIR_FAIL;
+				goto error;
+			}
+		}
+	}
+
 	/* Kernel tracing */
 	if (ksession != NULL) {
+		DBG("Start kernel tracing session %s", session->name);
 		ret = start_kernel_session(ksession, kernel_tracer_fd);
 		if (ret != LTTNG_OK) {
 			goto error;
@@ -2439,12 +2586,70 @@ int cmd_start_trace(struct ltt_session *session)
 	session->has_been_started = 1;
 	session->active = 1;
 
+	/*
+	 * Clear the flag that indicates that a rotation was done while the
+	 * session was stopped.
+	 */
+	session->rotated_after_last_stop = false;
+
+	if (session->rotate_timer_period) {
+		ret = sessiond_rotate_timer_start(session,
+				session->rotate_timer_period);
+		if (ret < 0) {
+			ERR("Failed to enable rotate timer");
+			ret = LTTNG_ERR_UNK;
+			goto error;
+		}
+	}
+
 	ret = LTTNG_OK;
 
 error:
 	return ret;
 }
 
+static
+int rename_active_chunk(struct ltt_session *session)
+{
+	int ret;
+
+	session->current_archive_id++;
+
+	/*
+	 * The currently active tracing path is now the folder we
+	 * want to rename.
+	 */
+	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 active tracing path");
+		goto end;
+	}
+
+	ret = rename_complete_chunk(session, time(NULL));
+	if (ret < 0) {
+		ERR("Failed to rename current rotate path");
+		goto end;
+	}
+
+	/*
+	 * We just renamed, the folder, we didn't do an actual rotation, so
+	 * the active tracing path is now the renamed folder and we have to
+	 * restore the rotate count.
+	 */
+	ret = lttng_strncpy(session->rotation_chunk.active_tracing_path,
+			session->rotation_chunk.current_rotate_path,
+			sizeof(session->rotation_chunk.active_tracing_path));
+	if (ret) {
+		ERR("Failed to rename active session chunk tracing path");
+		goto end;
+	}
+end:
+	session->current_archive_id--;
+	return ret;
+}
+
 /*
  * Command LTTNG_STOP_TRACE processed by the client thread.
  */
@@ -2454,9 +2659,11 @@ int cmd_stop_trace(struct ltt_session *session)
 	struct ltt_kernel_channel *kchan;
 	struct ltt_kernel_session *ksession;
 	struct ltt_ust_session *usess;
+	bool error_occured = false;
 
 	assert(session);
 
+	DBG("Begin stop session %s (id %" PRIu64 ")", session->name, session->id);
 	/* Short cut */
 	ksession = session->kernel_session;
 	usess = session->ust_session;
@@ -2467,6 +2674,25 @@ int cmd_stop_trace(struct ltt_session *session)
 		goto error;
 	}
 
+	if (session->rotate_relay_pending_timer_enabled) {
+		sessiond_timer_rotate_pending_stop(session);
+	}
+
+	if (session->rotate_timer_enabled) {
+		sessiond_rotate_timer_stop(session);
+	}
+
+	if (session->current_archive_id > 0 && !session->rotate_pending) {
+		ret = rename_active_chunk(session);
+		if (ret) {
+			/*
+			 * This error should not prevent the user from stopping
+			 * the session. However, it will be reported at the end.
+			 */
+			error_occured = true;
+		}
+	}
+
 	/* Kernel tracer */
 	if (ksession && ksession->active) {
 		DBG("Stop kernel tracing");
@@ -2496,6 +2722,8 @@ int cmd_stop_trace(struct ltt_session *session)
 		}
 
 		ksession->active = 0;
+		DBG("Kernel session stopped %s (id %" PRIu64 ")", session->name,
+				session->id);
 	}
 
 	if (usess && usess->active) {
@@ -2514,7 +2742,7 @@ int cmd_stop_trace(struct ltt_session *session)
 
 	/* Flag inactive after a successful stop. */
 	session->active = 0;
-	ret = LTTNG_OK;
+	ret = !error_occured ? LTTNG_OK : LTTNG_ERR_UNK;
 
 error:
 	return ret;
@@ -2738,7 +2966,8 @@ error:
  *
  * Called with session lock held.
  */
-int cmd_destroy_session(struct ltt_session *session, int wpipe)
+int cmd_destroy_session(struct ltt_session *session, int wpipe,
+		struct notification_thread_handle *notification_thread_handle)
 {
 	int ret;
 	struct ltt_ust_session *usess;
@@ -2750,6 +2979,30 @@ int cmd_destroy_session(struct ltt_session *session, int wpipe)
 	usess = session->ust_session;
 	ksess = session->kernel_session;
 
+	DBG("Begin destroy session %s (id %" PRIu64 ")", session->name, session->id);
+
+	if (session->rotate_relay_pending_timer_enabled) {
+		sessiond_timer_rotate_pending_stop(session);
+	}
+
+	if (session->rotate_timer_enabled) {
+		sessiond_rotate_timer_stop(session);
+	}
+
+	if (session->rotate_size) {
+		unsubscribe_session_consumed_size_rotation(session, notification_thread_handle);
+		session->rotate_size = 0;
+	}
+
+	/*
+	 * The rename of the current chunk is performed at stop, but if we rotated
+	 * the session after the previous stop command, we need to rename the
+	 * new (and empty) chunk that was started in between.
+	 */
+	if (session->rotated_after_last_stop) {
+		rename_active_chunk(session);
+	}
+
 	/* Clean kernel session teardown */
 	kernel_destroy_session(ksess);
 
@@ -3127,6 +3380,8 @@ int cmd_data_pending(struct ltt_session *session)
 
 	assert(session);
 
+	DBG("Data pending for session %s", session->name);
+
 	/* Session MUST be stopped to ask for data availability. */
 	if (session->active) {
 		ret = LTTNG_ERR_SESSION_STARTED;
@@ -3148,6 +3403,15 @@ int cmd_data_pending(struct ltt_session *session)
 		}
 	}
 
+	/*
+	 * A rotation is still pending, we have to wait.
+	 */
+	if (session->rotate_pending) {
+		DBG("Rotate still pending for session %s", session->name);
+		ret = 1;
+		goto error;
+	}
+
 	if (ksess && ksess->consumer) {
 		ret = consumer_is_data_pending(ksess->id, ksess->consumer);
 		if (ret == 1) {
@@ -3420,10 +3684,12 @@ static
 int clear_metadata_file(int fd)
 {
 	int ret;
+	off_t lseek_ret;
 
-	ret = lseek(fd, 0, SEEK_SET);
-	if (ret < 0) {
+	lseek_ret = lseek(fd, 0, SEEK_SET);
+	if (lseek_ret < 0) {
 		PERROR("lseek");
+		ret = -1;
 		goto end;
 	}
 
@@ -4118,6 +4384,486 @@ int cmd_set_session_shm_path(struct ltt_session *session,
 	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.
+ *
+ * Return LTTNG_OK on success or else a LTTNG_ERR code.
+ */
+int cmd_rotate_session(struct ltt_session *session,
+		struct lttng_rotate_session_return *rotate_return)
+{
+	int ret;
+	size_t strf_ret;
+	struct tm *timeinfo;
+	char datetime[21];
+	time_t now;
+	bool ust_active = false;
+
+	assert(session);
+
+	if (!session->has_been_started) {
+		ret = -LTTNG_ERR_START_SESSION_ONCE;
+		goto end;
+	}
+
+	if (session->live_timer || session->snapshot_mode ||
+			!session->output_traces) {
+		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)) {
+		ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY;
+		goto end;
+	}
+
+	if (session->rotate_pending || session->rotate_pending_relay) {
+		ret = -LTTNG_ERR_ROTATION_PENDING;
+		DBG("Rotate already in progress");
+		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);
+		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;
+
+		/* Either one of the two sessions is enough to get the root path. */
+		if (session->kernel_session) {
+			base_path = session_get_base_path(session);
+		} else if (session->ust_session) {
+			base_path = session_get_base_path(session);
+		} else {
+			assert(0);
+		}
+		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");
+			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");
+			ret = -LTTNG_ERR_UNK;
+			goto end;
+		}
+	}
+	DBG("Current rotate path %s", session->rotation_chunk.current_rotate_path);
+
+	session->current_archive_id++;
+	session->rotate_pending = true;
+	session->rotation_state = LTTNG_ROTATION_STATE_ONGOING;
+
+	/*
+	 * Create the path name for the next chunk.
+	 */
+	now = time(NULL);
+	if (now == (time_t) -1) {
+		ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE;
+		goto end;
+	}
+	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");
+		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");
+		ret = -LTTNG_ERR_UNK;
+		goto end;
+	}
+	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");
+			ret = -LTTNG_ERR_UNK;
+			goto end;
+		}
+		/*
+		 * 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");
+			ret = -LTTNG_ERR_UNK;
+			goto end;
+		}
+		/*
+		 * 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);
+			ret = -LTTNG_ERR_CREATE_DIR_FAIL;
+			goto end;
+		}
+		ret = kernel_rotate_session(session);
+		if (ret != LTTNG_OK) {
+			ret = -ret;
+			goto end;
+		}
+	}
+	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");
+			ret = -LTTNG_ERR_UNK;
+			goto end;
+		}
+		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");
+			ret = -LTTNG_ERR_UNK;
+			goto end;
+		}
+		/*
+		 * 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) {
+			ret = -LTTNG_ERR_CREATE_DIR_FAIL;
+			goto end;
+		}
+		ret = ust_app_rotate_session(session, &ust_active);
+		if (ret != LTTNG_OK) {
+			goto end;
+		}
+		/*
+		 * Handle the case where we did not start a rotation on any channel.
+		 * The consumer will never wake up the rotation thread to perform the
+		 * rename, so we have to do it here while we hold the session and
+		 * session_list locks.
+		 */
+		if (!session->kernel_session && !ust_active) {
+			ret = rename_complete_chunk(session, now);
+			if (ret < 0) {
+				ERR("Failed to rename completed rotation chunk");
+				goto end;
+			}
+			session->rotate_pending = false;
+			session->rotation_state = LTTNG_ROTATION_STATE_COMPLETED;
+		}
+	}
+
+	if (!session->active) {
+		session->rotated_after_last_stop = true;
+	}
+
+	if (rotate_return) {
+		rotate_return->rotation_id = session->current_archive_id;
+	}
+
+	DBG("Cmd rotate session %s, current_archive_id %" PRIu64 " sent",
+			session->name, session->current_archive_id);
+	ret = LTTNG_OK;
+
+end:
+	return ret;
+}
+
+/*
+ * 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:
+	return ret;
+}
+
+/*
+ * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library.
+ *
+ * Configure the automatic rotation parameters.
+ * Set to -1ULL to disable them.
+ *
+ * Return 0 on success or else an LTTNG_ERR code.
+ */
+int cmd_rotation_set_schedule(struct ltt_session *session,
+		uint64_t timer_us, uint64_t size,
+		struct notification_thread_handle *notification_thread_handle)
+{
+	int ret;
+
+	assert(session);
+
+	DBG("Cmd rotate set schedule session %s", session->name);
+
+	if (session->live_timer || session->snapshot_mode ||
+			!session->output_traces) {
+		ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE;
+		goto end;
+	}
+
+	/* Trying to override an already active timer. */
+	if (timer_us && timer_us != -1ULL && session->rotate_timer_period) {
+		ret = LTTNG_ERR_ROTATION_TIMER_SET;
+		goto end;
+	/* Trying to disable an inactive timer. */
+	} else if (timer_us == -1ULL && !session->rotate_timer_period) {
+		ret = LTTNG_ERR_ROTATION_NO_TIMER_SET;
+		goto end;
+	}
+
+	if (size && size != -1ULL && session->rotate_size) {
+		ret = LTTNG_ERR_ROTATION_SIZE_SET;
+		goto end;
+	} else if (size == -1ULL && !session->rotate_size) {
+		ret = LTTNG_ERR_ROTATION_NO_SIZE_SET;
+		goto end;
+	}
+
+	if (timer_us && !session->rotate_timer_period) {
+		if (timer_us > UINT_MAX) {
+			ret = LTTNG_ERR_INVALID;
+			goto end;
+		}
+
+		session->rotate_timer_period = timer_us;
+		/*
+		 * Only start the timer if the session is active, otherwise
+		 * it will be started when the session starts.
+		 */
+		if (session->active) {
+			ret = sessiond_rotate_timer_start(session, timer_us);
+			if (ret) {
+				ERR("Failed to enable rotate timer");
+				ret = LTTNG_ERR_UNK;
+				goto end;
+			}
+		}
+	} else if (timer_us == -1ULL && session->rotate_timer_period > 0) {
+		sessiond_rotate_timer_stop(session);
+		session->rotate_timer_period = 0;
+	}
+
+	if (size > 0) {
+		if (size == -1ULL) {
+			ret = unsubscribe_session_consumed_size_rotation(session,
+					notification_thread_handle);
+			if (ret) {
+				ret = LTTNG_ERR_UNK;
+				goto end;
+			}
+			session->rotate_size = 0;
+		} else {
+			ret = subscribe_session_consumed_size_rotation(session,
+					size, notification_thread_handle);
+			if (ret) {
+				PERROR("Subscribe to session usage");
+				ret = LTTNG_ERR_UNK;
+				goto end;
+			}
+			session->rotate_size = size;
+		}
+	}
+
+	ret = LTTNG_OK;
+
+	goto end;
+
+end:
+	return ret;
+}
+
+/*
+ * Command ROTATE_GET_CURRENT_PATH from the lttng-ctl library.
+ *
+ * Configure the automatic rotation parameters.
+ * Set to -1ULL to disable them.
+ *
+ * Return LTTNG_OK on success or else a LTTNG_ERR code.
+ */
+int cmd_session_get_current_output(struct ltt_session *session,
+		struct lttng_session_get_current_output_return *output_return)
+{
+	int ret;
+	const char *path;
+
+	if (!session->snapshot_mode) {
+		if (session->current_archive_id == 0) {
+			if (session->kernel_session) {
+				path = session_get_base_path(session);
+			} else if (session->ust_session) {
+				path = session_get_base_path(session);
+			} else {
+				abort();
+			}
+			assert(path);
+		} else {
+			path = session->rotation_chunk.active_tracing_path;
+		}
+	} else {
+		/*
+		 * A snapshot session does not have a "current" trace archive
+		 * location.
+		 */
+		path = "";
+	}
+
+	DBG("Cmd get current output for session %s, returning %s",
+			session->name, path);
+
+	ret = lttng_strncpy(output_return->path,
+			path,
+			sizeof(output_return->path));
+	if (ret) {
+		ERR("Failed to copy trace output path to session get current output command reply");
+		ret = -LTTNG_ERR_UNK;
+		goto end;
+	}
+
+	ret = LTTNG_OK;
+end:
+	return ret;
+}
+
 /*
  * Init command subsystem.
  */