#include <common/utils.h>
#include <common/compat/string.h>
#include <common/kernel-ctl/kernel-ctl.h>
+#include <common/dynamic-buffer.h>
+#include <common/buffer-view.h>
+#include <lttng/trigger/trigger-internal.h>
+#include <lttng/condition/condition.h>
+#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 "consumer.h"
#include "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 "cmd.h"
static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
static uint64_t relayd_net_seq_idx;
-static int validate_event_name(const char *);
static int validate_ust_event_name(const char *);
static int cmd_enable_event_internal(struct ltt_session *session,
struct lttng_domain *domain,
goto end;
}
- ret = consumer_get_discarded_events(session->id, kchan->fd,
+ ret = consumer_get_discarded_events(session->id, kchan->key,
session->kernel_session->consumer,
discarded_events);
if (ret < 0) {
goto end;
}
- ret = consumer_get_lost_packets(session->id, kchan->fd,
+ ret = consumer_get_lost_packets(session->id, kchan->key,
session->kernel_session->consumer,
lost_packets);
if (ret < 0) {
/*
* Fill lttng_channel array of all channels.
*/
-static void list_lttng_channels(enum lttng_domain_type domain,
+static ssize_t list_lttng_channels(enum lttng_domain_type domain,
struct ltt_session *session, struct lttng_channel *channels,
- struct lttcomm_channel_extended *chan_exts)
+ struct lttng_channel_extended *chan_exts)
{
- int i = 0, ret;
+ int i = 0, ret = 0;
struct ltt_kernel_channel *kchan;
DBG("Listing channels for session %s", session->name);
cds_list_for_each_entry(kchan,
&session->kernel_session->channel_list.head, list) {
uint64_t discarded_events, lost_packets;
+ struct lttng_channel_extended *extended;
+
+ extended = (struct lttng_channel_extended *)
+ kchan->channel->attr.extended.ptr;
ret = get_kernel_runtime_stats(session, kchan,
&discarded_events, &lost_packets);
chan_exts[i].discarded_events =
discarded_events;
chan_exts[i].lost_packets = lost_packets;
+ chan_exts[i].monitor_timer_interval =
+ extended->monitor_timer_interval;
+ chan_exts[i].blocking_timeout = 0;
i++;
}
}
break;
}
+ chan_exts[i].monitor_timer_interval =
+ uchan->monitor_timer_interval;
+ chan_exts[i].blocking_timeout =
+ uchan->attr.u.s.blocking_timeout;
+
ret = get_ust_runtime_stats(session, uchan,
&discarded_events, &lost_packets);
if (ret < 0) {
}
end:
- return;
+ if (ret < 0) {
+ return -LTTNG_ERR_FATAL;
+ } else {
+ return LTTNG_OK;
+ }
}
static void increment_extended_len(const char *filter_expression,
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;
/* Check relayd version */
ret = relayd_version_check(rsock);
- if (ret < 0) {
- ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
+ if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) {
+ goto close_sock;
+ } else if (ret < 0) {
+ ERR("Unable to reach lttng-relayd");
+ ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
goto close_sock;
}
consumer->relay_major_version = rsock->major;
/*
* Connect to the relayd using URI and send the socket to the right consumer.
+ *
+ * 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,
/* Connect to relayd and make version check if uri is the control. */
ret = create_connect_relayd(relayd_uri, &rsock, consumer);
if (ret != LTTNG_OK) {
- goto error;
+ goto relayd_comm_error;
}
assert(rsock);
*/
close_sock:
- (void) relayd_close(rsock);
- free(rsock);
-
-error:
if (ret != LTTNG_OK) {
/*
* The consumer output for this session should not be used anymore
*/
consumer->enabled = 0;
}
+ (void) relayd_close(rsock);
+ free(rsock);
+
+relayd_comm_error:
return ret;
}
* Send both relayd sockets to a specific consumer and domain. This is a
* helper function to facilitate sending the information to the consumer for a
* session.
+ *
+ * The consumer socket lock must be held by the caller.
*/
static int send_consumer_relayd_sockets(enum lttng_domain_type domain,
unsigned int session_id, struct consumer_output *consumer,
attr->attr.switch_timer_interval = 0;
}
+ /* Check for feature support */
+ switch (domain->type) {
+ case LTTNG_DOMAIN_KERNEL:
+ {
+ if (kernel_supports_ring_buffer_snapshot_sample_positions(kernel_tracer_fd) != 1) {
+ /* Sampling position of buffer is not supported */
+ WARN("Kernel tracer does not support buffer monitoring. "
+ "Setting the monitor interval timer to 0 "
+ "(disabled) for channel '%s' of session '%s'",
+ attr-> name, session->name);
+ lttng_channel_set_monitor_timer_interval(attr, 0);
+ }
+ break;
+ }
+ case LTTNG_DOMAIN_UST:
+ case LTTNG_DOMAIN_JUL:
+ case LTTNG_DOMAIN_LOG4J:
+ case LTTNG_DOMAIN_PYTHON:
+ break;
+ default:
+ ret = LTTNG_ERR_UNKNOWN_DOMAIN;
+ goto error;
+ }
+
switch (domain->type) {
case LTTNG_DOMAIN_KERNEL:
{
DBG("Disable event command for event \'%s\'", event->name);
event_name = event->name;
- if (validate_event_name(event_name)) {
- ret = LTTNG_ERR_INVALID_EVENT_NAME;
- goto error;
- }
/* Error out on unhandled search criteria */
if (event->loglevel_type || event->loglevel != -1 || event->enabled
int ret, chan_kern_created = 0, chan_ust_created = 0;
char *app_ctx_provider_name = NULL, *app_ctx_name = NULL;
+ /*
+ * Don't try to add a context if the session has been started at
+ * some point in time before. The tracer does not allow it and would
+ * result in a corrupted trace.
+ */
+ if (session->has_been_started) {
+ ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
+ goto end;
+ }
+
if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
app_ctx_provider_name = ctx->u.app_ctx.provider_name;
app_ctx_name = ctx->u.app_ctx.ctx_name;
free(attr);
goto error;
}
- free(attr);
+ channel_attr_destroy(attr);
chan_ust_created = 1;
}
return ret;
}
-static int validate_event_name(const char *name)
-{
- int ret = 0;
- const char *c = name;
- const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
- bool null_terminated = false;
-
- /*
- * Make sure that unescaped wildcards are only used as the last
- * character of the event name.
- */
- while (c < event_name_end) {
- switch (*c) {
- case '\0':
- null_terminated = true;
- goto end;
- case '\\':
- c++;
- break;
- case '*':
- if ((c + 1) < event_name_end && *(c + 1)) {
- /* Wildcard is not the last character */
- ret = LTTNG_ERR_INVALID_EVENT_NAME;
- goto end;
- }
- default:
- break;
- }
- c++;
- }
-end:
- if (!ret && !null_terminated) {
- ret = LTTNG_ERR_INVALID_EVENT_NAME;
- }
- return ret;
-}
-
static inline bool name_starts_with(const char *name, const char *prefix)
{
const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
struct lttng_event_exclusion *exclusion,
int wpipe, bool internal_event)
{
- int ret, channel_created = 0;
+ int ret = 0, channel_created = 0;
struct lttng_channel *attr = NULL;
assert(session);
/* If we have a filter, we must have its filter expression */
assert(!(!!filter_expression ^ !!filter));
- DBG("Enable event command for event \'%s\'", event->name);
+ /* Normalize event name as a globbing pattern */
+ strutils_normalize_star_glob_pattern(event->name);
- rcu_read_lock();
+ /* Normalize exclusion names as globbing patterns */
+ if (exclusion) {
+ size_t i;
- ret = validate_event_name(event->name);
- if (ret) {
- goto error;
+ for (i = 0; i < exclusion->count; i++) {
+ char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i);
+
+ strutils_normalize_star_glob_pattern(name);
+ }
}
+ DBG("Enable event command for event \'%s\'", event->name);
+
+ rcu_read_lock();
+
switch (domain->type) {
case LTTNG_DOMAIN_KERNEL:
{
free(filter_expression);
free(filter);
free(exclusion);
- free(attr);
+ channel_attr_destroy(attr);
rcu_read_unlock();
return ret;
}
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);
if (nb_chan > 0) {
const size_t channel_size = sizeof(struct lttng_channel) +
- sizeof(struct lttcomm_channel_extended);
- struct lttcomm_channel_extended *channel_exts;
+ sizeof(struct lttng_channel_extended);
+ struct lttng_channel_extended *channel_exts;
payload_size = nb_chan * channel_size;
*channels = zmalloc(payload_size);
channel_exts = ((void *) *channels) +
(nb_chan * sizeof(struct lttng_channel));
- list_lttng_channels(domain, session, *channels, channel_exts);
+ ret = list_lttng_channels(domain, session, *channels, channel_exts);
+ if (ret != LTTNG_OK) {
+ free(*channels);
+ *channels = NULL;
+ goto end;
+ }
} else {
*channels = NULL;
}
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;
ret = LTTNG_ERR_SESSION_NOT_STARTED;
goto end;
}
- ret = 0;
if (session->kernel_session) {
ret = kernctl_session_regenerate_statedump(
return ret;
}
+int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock,
+ struct notification_thread_handle *notification_thread)
+{
+ int ret;
+ size_t trigger_len;
+ ssize_t sock_recv_len;
+ struct lttng_trigger *trigger = NULL;
+ struct lttng_buffer_view view;
+ struct lttng_dynamic_buffer trigger_buffer;
+
+ lttng_dynamic_buffer_init(&trigger_buffer);
+ trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length;
+ ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len);
+ if (ret) {
+ ret = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data,
+ trigger_len);
+ if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
+ ERR("Failed to receive \"register trigger\" command payload");
+ /* TODO: should this be a new error enum ? */
+ ret = LTTNG_ERR_INVALID_TRIGGER;
+ goto end;
+ }
+
+ view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1);
+ if (lttng_trigger_create_from_buffer(&view, &trigger) !=
+ trigger_len) {
+ ERR("Invalid trigger payload received in \"register trigger\" command");
+ ret = LTTNG_ERR_INVALID_TRIGGER;
+ goto end;
+ }
+
+ ret = notification_thread_command_register_trigger(notification_thread,
+ trigger);
+ /* Ownership of trigger was transferred. */
+ trigger = NULL;
+end:
+ lttng_trigger_destroy(trigger);
+ lttng_dynamic_buffer_reset(&trigger_buffer);
+ return ret;
+}
+
+int cmd_unregister_trigger(struct command_ctx *cmd_ctx, int sock,
+ struct notification_thread_handle *notification_thread)
+{
+ int ret;
+ size_t trigger_len;
+ ssize_t sock_recv_len;
+ struct lttng_trigger *trigger = NULL;
+ struct lttng_buffer_view view;
+ struct lttng_dynamic_buffer trigger_buffer;
+
+ lttng_dynamic_buffer_init(&trigger_buffer);
+ trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length;
+ ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len);
+ if (ret) {
+ ret = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data,
+ trigger_len);
+ if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
+ ERR("Failed to receive \"unregister trigger\" command payload");
+ /* TODO: should this be a new error enum ? */
+ ret = LTTNG_ERR_INVALID_TRIGGER;
+ goto end;
+ }
+
+ view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1);
+ if (lttng_trigger_create_from_buffer(&view, &trigger) !=
+ trigger_len) {
+ ERR("Invalid trigger payload received in \"unregister trigger\" command");
+ ret = LTTNG_ERR_INVALID_TRIGGER;
+ goto end;
+ }
+
+ ret = notification_thread_command_unregister_trigger(notification_thread,
+ trigger);
+end:
+ lttng_trigger_destroy(trigger);
+ lttng_dynamic_buffer_reset(&trigger_buffer);
+ return ret;
+}
+
/*
* Send relayd sockets from snapshot output to consumer. Ignore request if the
* snapshot output is *not* set with a remote destination.
rcu_read_lock();
cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
socket, node.node) {
+ pthread_mutex_lock(socket->lock);
ret = send_consumer_relayd_sockets(0, session->id,
snap_output->consumer, socket,
session->name, session->hostname,
session->live_timer);
+ pthread_mutex_unlock(socket->lock);
if (ret != LTTNG_OK) {
rcu_read_unlock();
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:
+ {
+ 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 =
+ (uint8_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 =
+ (uint8_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 =
+ (uint8_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->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