#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"
#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 "cmd.h"
break;
case LTTNG_DST_PATH:
DBG2("Setting trace directory path from URI to %s", uri->dst.path);
- memset(consumer->dst.trace_path, 0,
- sizeof(consumer->dst.trace_path));
+ memset(consumer->dst.session_root_path, 0,
+ sizeof(consumer->dst.session_root_path));
/* Explicit length checks for strcpy and strcat. */
if (strlen(uri->dst.path) + strlen(default_trace_dir)
- >= sizeof(consumer->dst.trace_path)) {
+ >= sizeof(consumer->dst.session_root_path)) {
ret = LTTNG_ERR_FATAL;
goto error;
}
- strcpy(consumer->dst.trace_path, uri->dst.path);
+ strcpy(consumer->dst.session_root_path, uri->dst.path);
/* Append default trace dir */
- strcat(consumer->dst.trace_path, default_trace_dir);
+ strcat(consumer->dst.session_root_path, default_trace_dir);
/* Flag consumer as local. */
consumer->type = CONSUMER_DST_LOCAL;
break;
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.
*
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;
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->rotate_count++;
+
+ /*
+ * 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->rotate_count--;
+ return ret;
+}
+
/*
* Command LTTNG_STOP_TRACE processed by the client thread.
*/
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;
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->rotate_count > 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");
}
ksession->active = 0;
+ DBG("Kernel session stopped %s (id %" PRIu64 ")", session->name,
+ session->id);
}
if (usess && usess->active) {
/* Flag inactive after a successful stop. */
session->active = 0;
- ret = LTTNG_OK;
+ ret = !error_occured ? LTTNG_OK : LTTNG_ERR_UNK;
error:
return ret;
*
* 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;
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);
sizeof(sessions[i].path), session);
} else {
ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
- session->consumer->dst.trace_path);
+ session->consumer->dst.session_root_path);
}
if (ret < 0) {
PERROR("snprintf session path");
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;
}
}
+ /*
+ * 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) {
}
if (output->consumer->type == CONSUMER_DST_LOCAL) {
if (lttng_strncpy(list[idx].ctrl_url,
- output->consumer->dst.trace_path,
+ output->consumer->dst.session_root_path,
sizeof(list[idx].ctrl_url))) {
ret = -LTTNG_ERR_INVALID;
goto error;
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->rotate_count == 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->rotate_count++;
+ 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->rotate_count + 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->rotate_count + 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->rotate_count + 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->rotate_count + 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->rotate_count;
+ }
+
+ DBG("Cmd rotate session %s, rotate_id %" PRIu64 " sent", session->name,
+ session->rotate_count);
+ 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->rotate_count);
+
+ if (session->rotate_count != 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:
+ ret = lttng_strncpy(info_return->path,
+ session->rotation_chunk.current_rotate_path,
+ sizeof(info_return->path));
+ if (ret) {
+ ERR("Failed to copy active 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->rotate_count == 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.
*/
projects / lttng-tools.git / blobdiff