#include <inttypes.h>
#include <urcu/list.h>
#include <urcu/uatomic.h>
+#include <sys/stat.h>
#include <common/defaults.h>
#include <common/common.h>
#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 <lttng/location-internal.h>
+#include <lttng/userspace-probe-internal.h>
+#include <common/string-utils/string-utils.h>
#include "channel.h"
#include "consumer.h"
#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 "timer.h"
+#include "agent-thread.h"
#include "cmd.h"
+/* Sleep for 100ms between each check for the shm path's deletion. */
+#define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000
+
+static enum lttng_error_code wait_on_path(void *path);
+
+/*
+ * Command completion handler that is used by the destroy command
+ * when a session that has a non-default shm_path is being destroyed.
+ *
+ * See comment in cmd_destroy_session() for the rationale.
+ */
+static struct destroy_completion_handler {
+ struct cmd_completion_handler handler;
+ char shm_path[member_sizeof(struct ltt_session, shm_path)];
+} destroy_completion_handler = {
+ .handler = {
+ .run = wait_on_path,
+ .data = destroy_completion_handler.shm_path
+ },
+ .shm_path = { 0 },
+};
+
+static struct cmd_completion_handler *current_completion_handler;
+
/*
* Used to keep a unique index for each relayd socket created where this value
* is associated with streams on the consumer so it can match the right relayd
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++;
}
}
&iter.iter, uchan, node.node) {
uint64_t discarded_events = 0, lost_packets = 0;
- strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
+ if (lttng_strncpy(channels[i].name, uchan->name,
+ LTTNG_SYMBOL_NAME_LEN)) {
+ break;
+ }
channels[i].attr.overwrite = uchan->attr.overwrite;
channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
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,
- struct lttng_event_exclusion *exclusion, size_t *extended_len)
+static int increment_extended_len(const char *filter_expression,
+ struct lttng_event_exclusion *exclusion,
+ const struct lttng_userspace_probe_location *probe_location,
+ size_t *extended_len)
{
+ int ret = 0;
+
*extended_len += sizeof(struct lttcomm_event_extended_header);
if (filter_expression) {
if (exclusion) {
*extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN;
}
+
+ if (probe_location) {
+ ret = lttng_userspace_probe_location_serialize(probe_location,
+ NULL, NULL);
+ if (ret < 0) {
+ goto end;
+ }
+ *extended_len += ret;
+ }
+ ret = 0;
+end:
+ return ret;
}
-static void append_extended_info(const char *filter_expression,
- struct lttng_event_exclusion *exclusion, void **extended_at)
+static int append_extended_info(const char *filter_expression,
+ struct lttng_event_exclusion *exclusion,
+ struct lttng_userspace_probe_location *probe_location,
+ void **extended_at)
{
- struct lttcomm_event_extended_header extended_header;
+ int ret = 0;
size_t filter_len = 0;
size_t nb_exclusions = 0;
+ size_t userspace_probe_location_len = 0;
+ struct lttng_dynamic_buffer location_buffer;
+ struct lttcomm_event_extended_header extended_header;
if (filter_expression) {
filter_len = strlen(filter_expression) + 1;
nb_exclusions = exclusion->count;
}
+ if (probe_location) {
+ lttng_dynamic_buffer_init(&location_buffer);
+ ret = lttng_userspace_probe_location_serialize(probe_location,
+ &location_buffer, NULL);
+ if (ret < 0) {
+ ret = -1;
+ goto end;
+ }
+ userspace_probe_location_len = location_buffer.size;
+ }
+
/* Set header fields */
extended_header.filter_len = filter_len;
extended_header.nb_exclusions = nb_exclusions;
+ extended_header.userspace_probe_location_len = userspace_probe_location_len;
/* Copy header */
memcpy(*extended_at, &extended_header, sizeof(extended_header));
memcpy(*extended_at, &exclusion->names, len);
*extended_at += len;
}
+
+ if (probe_location) {
+ memcpy(*extended_at, location_buffer.data, location_buffer.size);
+ *extended_at += location_buffer.size;
+ lttng_dynamic_buffer_reset(&location_buffer);
+ }
+ ret = 0;
+end:
+ return ret;
}
/*
int i = 0, ret = 0;
unsigned int nb_event = 0;
struct agent_event *event;
- struct lttng_event *tmp_events;
+ struct lttng_event *tmp_events = NULL;
struct lttng_ht_iter iter;
size_t extended_len = 0;
void *extended_at;
*/
rcu_read_lock();
cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
- increment_extended_len(event->filter_expression, NULL,
+ ret = increment_extended_len(event->filter_expression, NULL, NULL,
&extended_len);
+ if (ret) {
+ DBG("Error computing the length of extended info message");
+ ret = -LTTNG_ERR_FATAL;
+ goto error;
+ }
}
rcu_read_unlock();
i++;
/* Append extended info */
- append_extended_info(event->filter_expression, NULL,
+ ret = append_extended_info(event->filter_expression, NULL, NULL,
&extended_at);
+ if (ret) {
+ DBG("Error appending extended info message");
+ ret = -LTTNG_ERR_FATAL;
+ goto error;
+ }
}
- rcu_read_unlock();
*events = tmp_events;
ret = nb_event;
-
-error:
assert(nb_event == i);
+
+end:
+ rcu_read_unlock();
return ret;
+error:
+ free(tmp_events);
+ goto end;
}
/*
continue;
}
- increment_extended_len(uevent->filter_expression,
- uevent->exclusion, &extended_len);
+ ret = increment_extended_len(uevent->filter_expression,
+ uevent->exclusion, NULL, &extended_len);
+ if (ret) {
+ DBG("Error computing the length of extended info message");
+ ret = -LTTNG_ERR_FATAL;
+ goto end;
+ }
}
if (nb_event == 0) {
/* All events are internal, skip. */
i++;
/* Append extended info */
- append_extended_info(uevent->filter_expression,
- uevent->exclusion, &extended_at);
+ ret = append_extended_info(uevent->filter_expression,
+ uevent->exclusion, NULL, &extended_at);
+ if (ret) {
+ DBG("Error appending extended info message");
+ ret = -LTTNG_ERR_FATAL;
+ goto end;
+ }
}
ret = nb_event;
/* Compute required extended infos size */
cds_list_for_each_entry(event, &kchan->events_list.head, list) {
- increment_extended_len(event->filter_expression, NULL,
+ ret = increment_extended_len(event->filter_expression, NULL,
+ event->userspace_probe_location,
&extended_len);
+ if (ret) {
+ DBG("Error computing the length of extended info message");
+ ret = -LTTNG_ERR_FATAL;
+ goto error;
+ }
}
*total_size = nb_event * sizeof(struct lttng_event) + extended_len;
*events = zmalloc(*total_size);
if (*events == NULL) {
- ret = LTTNG_ERR_FATAL;
+ ret = -LTTNG_ERR_FATAL;
goto error;
}
memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
sizeof(struct lttng_kernel_kprobe));
break;
+ case LTTNG_KERNEL_UPROBE:
+ (*events)[i].type = LTTNG_EVENT_USERSPACE_PROBE;
+ break;
case LTTNG_KERNEL_FUNCTION:
(*events)[i].type = LTTNG_EVENT_FUNCTION;
memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
(*events)[i].type = LTTNG_EVENT_SYSCALL;
break;
case LTTNG_KERNEL_ALL:
+ /* fall-through. */
+ default:
assert(0);
break;
}
i++;
/* Append extended info */
- append_extended_info(event->filter_expression, NULL,
- &extended_at);
+ ret = append_extended_info(event->filter_expression, NULL,
+ event->userspace_probe_location, &extended_at);
+ if (ret) {
+ DBG("Error appending extended info message");
+ ret = -LTTNG_ERR_FATAL;
+ goto error;
+ }
}
end:
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;
* Create a socket to the relayd using the URI.
*
* On success, the relayd_sock pointer is set to the created socket.
- * Else, it's stays untouched and a lttcomm error code is returned.
+ * Else, it remains untouched and an LTTng error code is returned.
*/
-static int create_connect_relayd(struct lttng_uri *uri,
+static enum lttng_error_code create_connect_relayd(struct lttng_uri *uri,
struct lttcomm_relayd_sock **relayd_sock,
struct consumer_output *consumer)
{
int ret;
+ enum lttng_error_code status = LTTNG_OK;
struct lttcomm_relayd_sock *rsock;
rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
RELAYD_VERSION_COMM_MINOR);
if (!rsock) {
- ret = LTTNG_ERR_FATAL;
+ status = LTTNG_ERR_FATAL;
goto error;
}
health_poll_exit();
if (ret < 0) {
ERR("Unable to reach lttng-relayd");
- ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
+ status = LTTNG_ERR_RELAYD_CONNECT_FAIL;
goto free_sock;
}
/* Check relayd version */
ret = relayd_version_check(rsock);
- if (ret < 0) {
- ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
+ if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) {
+ status = LTTNG_ERR_RELAYD_VERSION_FAIL;
+ goto close_sock;
+ } else if (ret < 0) {
+ ERR("Unable to reach lttng-relayd");
+ status = LTTNG_ERR_RELAYD_CONNECT_FAIL;
goto close_sock;
}
consumer->relay_major_version = rsock->major;
} else {
/* Command is not valid */
ERR("Relayd invalid stream type: %d", uri->stype);
- ret = LTTNG_ERR_INVALID;
+ status = LTTNG_ERR_INVALID;
goto close_sock;
}
*relayd_sock = rsock;
- return LTTNG_OK;
+ return status;
close_sock:
/* The returned value is not useful since we are on an error path. */
free_sock:
free(rsock);
error:
- return ret;
+ return status;
}
/*
* Connect to the relayd using URI and send the socket to the right consumer.
+ *
+ * The consumer socket lock must be held by the caller.
+ *
+ * Returns LTTNG_OK on success or an LTTng error code on failure.
*/
-static int send_consumer_relayd_socket(enum lttng_domain_type domain,
- unsigned int session_id, struct lttng_uri *relayd_uri,
+static enum lttng_error_code 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)
{
int ret;
struct lttcomm_relayd_sock *rsock = NULL;
+ enum lttng_error_code status;
/* 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;
+ status = create_connect_relayd(relayd_uri, &rsock, consumer);
+ if (status != LTTNG_OK) {
+ goto relayd_comm_error;
}
assert(rsock);
relayd_uri->stype, session_id,
session_name, hostname, session_live_timer);
if (ret < 0) {
- ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
+ status = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
goto close_sock;
}
consumer_sock->data_sock_sent = 1;
}
- ret = LTTNG_OK;
-
/*
* Close socket which was dup on the consumer side. The session daemon does
* NOT keep track of the relayd socket(s) once transfer to the consumer.
*/
close_sock:
- (void) relayd_close(rsock);
- free(rsock);
-
-error:
- if (ret != LTTNG_OK) {
+ if (status != LTTNG_OK) {
/*
* The consumer output for this session should not be used anymore
* since the relayd connection failed thus making any tracing or/and
*/
consumer->enabled = 0;
}
- return ret;
+ (void) relayd_close(rsock);
+ free(rsock);
+
+relayd_comm_error:
+ return status;
}
/*
* 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.
+ *
+ * Returns LTTNG_OK, or an LTTng error code on failure.
*/
-static int send_consumer_relayd_sockets(enum lttng_domain_type domain,
+static enum lttng_error_code send_consumer_relayd_sockets(
+ enum lttng_domain_type domain,
unsigned int session_id, struct consumer_output *consumer,
struct consumer_socket *sock, char *session_name,
char *hostname, int session_live_timer)
{
- int ret = LTTNG_OK;
+ enum lttng_error_code status = LTTNG_OK;
assert(consumer);
assert(sock);
/* Sending control relayd socket. */
if (!sock->control_sock_sent) {
- ret = send_consumer_relayd_socket(domain, session_id,
+ status = send_consumer_relayd_socket(session_id,
&consumer->dst.net.control, consumer, sock,
session_name, hostname, session_live_timer);
- if (ret != LTTNG_OK) {
+ if (status != LTTNG_OK) {
goto error;
}
}
/* Sending data relayd socket. */
if (!sock->data_sock_sent) {
- ret = send_consumer_relayd_socket(domain, session_id,
+ status = send_consumer_relayd_socket(session_id,
&consumer->dst.net.data, consumer, sock,
session_name, hostname, session_live_timer);
- if (ret != LTTNG_OK) {
+ if (status != LTTNG_OK) {
goto error;
}
}
error:
- return ret;
+ return status;
}
/*
}
/* Quiescent wait after starting trace */
- kernel_wait_quiescent(kernel_tracer_fd);
+ kernel_wait_quiescent(wpipe);
ksess->active = 1;
attr->attr.switch_timer_interval = 0;
}
- /*
- * The ringbuffer (both in user space and kernel) behave badly in overwrite
- * mode and with less than 2 subbuf so block it right away and send back an
- * invalid attribute error.
- */
- if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
- ret = LTTNG_ERR_INVALID;
+ /* 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:
+ 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;
goto error;
}
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:
{
break;
}
case LTTNG_EVENT_PROBE:
+ case LTTNG_EVENT_USERSPACE_PROBE:
case LTTNG_EVENT_FUNCTION:
case LTTNG_EVENT_FUNCTION_ENTRY:
case LTTNG_EVENT_TRACEPOINT:
ret = validate_ust_event_name(event->name);
if (ret) {
WARN("Userspace event name %s failed validation.",
- event->name ?
- event->name : "NULL");
+ event->name);
ret = LTTNG_ERR_INVALID_EVENT_NAME;
goto error;
}
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);
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 = timer_session_rotation_schedule_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:
struct ltt_kernel_channel *kchan;
struct ltt_kernel_session *ksession;
struct ltt_ust_session *usess;
+ bool error_occurred = 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;
}
- /* Kernel tracer */
- if (ksession && ksession->active) {
- DBG("Stop kernel tracing");
+ if (session->rotation_schedule_timer_enabled) {
+ if (timer_session_rotation_schedule_timer_stop(
+ session)) {
+ ERR("Failed to stop the \"rotation schedule\" timer of session %s",
+ session->name);
+ }
+ }
- /* Flush metadata if exist */
- if (ksession->metadata_stream_fd >= 0) {
+ /*
+ * A rotation is still ongoing. The check timer will continue to wait
+ * for the rotation to complete. When the rotation finally completes,
+ * a check will be performed to rename the "active" chunk to the
+ * expected "timestamp_begin-timestamp_end" format.
+ */
+ if (session->current_archive_id > 0 &&
+ session->rotation_state != LTTNG_ROTATION_STATE_ONGOING) {
+ 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_occurred = true;
+ }
+ }
+
+ /* Kernel tracer */
+ if (ksession && ksession->active) {
+ DBG("Stop kernel tracing");
+
+ ret = kernel_stop_session(ksession);
+ if (ret < 0) {
+ ret = LTTNG_ERR_KERN_STOP_FAIL;
+ goto error;
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+
+ /* Flush metadata after stopping (if exists) */
+ if (ksession->metadata_stream_fd >= 0) {
ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
if (ret < 0) {
ERR("Kernel metadata flush failed");
}
}
- /* Flush all buffers before stopping */
+ /* Flush all buffers after stopping */
cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
ret = kernel_flush_buffer(kchan);
if (ret < 0) {
}
}
- ret = kernel_stop_session(ksession);
- if (ret < 0) {
- ret = LTTNG_ERR_KERN_STOP_FAIL;
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
-
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_occurred ? LTTNG_OK : LTTNG_ERR_UNK;
error:
return ret;
size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
{
int ret;
- struct ltt_session *session;
+ struct ltt_session *session = NULL;
assert(name);
assert(creds);
- /*
- * Verify if the session already exist
- *
- * XXX: There is no need for the session lock list here since the caller
- * (process_client_msg) is holding it. We might want to change that so a
- * single command does not lock the entire session list.
- */
+ /* Check if the session already exists. */
+ session_lock_list();
session = session_find_by_name(name);
+ session_unlock_list();
if (session != NULL) {
ret = LTTNG_ERR_EXIST_SESS;
- goto find_error;
+ goto end;
}
/* Create tracing session in the registry */
ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
LTTNG_SOCK_GET_GID_CRED(creds));
if (ret != LTTNG_OK) {
- goto session_error;
+ goto end;
}
- /*
- * Get the newly created session pointer back
- *
- * XXX: There is no need for the session lock list here since the caller
- * (process_client_msg) is holding it. We might want to change that so a
- * single command does not lock the entire session list.
- */
+ /* Get the newly created session pointer back. */
+ session_lock_list();
session = session_find_by_name(name);
+ session_unlock_list();
assert(session);
session->live_timer = live_timer;
session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
if (session->consumer == NULL) {
ret = LTTNG_ERR_FATAL;
- goto consumer_error;
+ goto end;
}
if (uris) {
ret = cmd_set_consumer_uri(session, nb_uri, uris);
if (ret != LTTNG_OK) {
- goto consumer_error;
+ goto end;
}
session->output_traces = 1;
} else {
session->consumer->enabled = 1;
- return LTTNG_OK;
-
-consumer_error:
- session_destroy(session);
-session_error:
-find_error:
+ ret = LTTNG_OK;
+end:
+ if (session) {
+ session_lock_list();
+ session_put(session);
+ session_unlock_list();
+ }
return ret;
}
size_t nb_uri, lttng_sock_cred *creds)
{
int ret;
- struct ltt_session *session;
+ struct ltt_session *session = NULL;
struct snapshot_output *new_output = NULL;
assert(name);
*/
ret = cmd_create_session_uri(name, NULL, 0, creds, 0);
if (ret != LTTNG_OK) {
- goto error;
+ goto end;
}
/* Get the newly created session pointer back. This should NEVER fail. */
+ session_lock_list();
session = session_find_by_name(name);
+ session_unlock_list();
assert(session);
/* Flag session for snapshot mode. */
/* Skip snapshot output creation if no URI is given. */
if (nb_uri == 0) {
+ /* Not an error. */
goto end;
}
snapshot_add_output(&session->snapshot, new_output);
rcu_read_unlock();
-end:
- return LTTNG_OK;
+ ret = LTTNG_OK;
+ goto end;
error_snapshot:
snapshot_output_destroy(new_output);
error_snapshot_alloc:
- session_destroy(session);
-error:
+end:
+ if (session) {
+ session_lock_list();
+ session_put(session);
+ session_unlock_list();
+ }
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,
+ struct notification_thread_handle *notification_thread_handle)
{
int ret;
- struct ltt_ust_session *usess;
- struct ltt_kernel_session *ksess;
/* Safety net */
assert(session);
- usess = session->ust_session;
- ksess = session->kernel_session;
+ DBG("Begin destroy session %s (id %" PRIu64 ")", session->name, session->id);
- /* Clean kernel session teardown */
- kernel_destroy_session(ksess);
-
- /* UST session teardown */
- if (usess) {
- /* Close any relayd session */
- consumer_output_send_destroy_relayd(usess->consumer);
+ if (session->rotation_pending_check_timer_enabled) {
+ if (timer_session_rotation_pending_check_stop(session)) {
+ ERR("Failed to stop the \"rotation pending check\" timer of session %s",
+ session->name);
+ }
+ }
- /* Destroy every UST application related to this session. */
- ret = ust_app_destroy_trace_all(usess);
- if (ret) {
- ERR("Error in ust_app_destroy_trace_all");
+ if (session->rotation_schedule_timer_enabled) {
+ if (timer_session_rotation_schedule_timer_stop(
+ session)) {
+ ERR("Failed to stop the \"rotation schedule\" timer of session %s",
+ session->name);
}
+ }
- /* Clean up the rest. */
- trace_ust_destroy_session(usess);
+ if (session->rotate_size) {
+ unsubscribe_session_consumed_size_rotation(session, notification_thread_handle);
+ session->rotate_size = 0;
}
/*
- * Must notify the kernel thread here to update it's poll set in order to
- * remove the channel(s)' fd just destroyed.
+ * 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.
*/
- ret = notify_thread_pipe(wpipe);
- if (ret < 0) {
- PERROR("write kernel poll pipe");
- }
-
- ret = session_destroy(session);
-
- return ret;
-}
-
-/*
- * Command LTTNG_CALIBRATE processed by the client thread.
- */
-int cmd_calibrate(enum lttng_domain_type domain,
- struct lttng_calibrate *calibrate)
-{
- int ret;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct lttng_kernel_calibrate kcalibrate;
-
- switch (calibrate->type) {
- case LTTNG_CALIBRATE_FUNCTION:
- default:
- /* Default and only possible calibrate option. */
- kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
- break;
- }
-
- ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
- if (ret < 0) {
- ret = LTTNG_ERR_KERN_ENABLE_FAIL;
- goto error;
- }
- break;
+ if (session->rotated_after_last_stop) {
+ rename_active_chunk(session);
}
- case LTTNG_DOMAIN_UST:
- {
- struct lttng_ust_calibrate ucalibrate;
- switch (calibrate->type) {
- case LTTNG_CALIBRATE_FUNCTION:
- default:
- /* Default and only possible calibrate option. */
- ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
- break;
- }
-
- ret = ust_app_calibrate_glb(&ucalibrate);
- if (ret < 0) {
- ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
- goto error;
- }
- break;
- }
- default:
- ret = LTTNG_ERR_UND;
- goto error;
+ if (session->shm_path[0]) {
+ /*
+ * When a session is created with an explicit shm_path,
+ * the consumer daemon will create its shared memory files
+ * at that location and will *not* unlink them. This is normal
+ * as the intention of that feature is to make it possible
+ * to retrieve the content of those files should a crash occur.
+ *
+ * To ensure the content of those files can be used, the
+ * sessiond daemon will replicate the content of the metadata
+ * cache in a metadata file.
+ *
+ * On clean-up, it is expected that the consumer daemon will
+ * unlink the shared memory files and that the session daemon
+ * will unlink the metadata file. Then, the session's directory
+ * in the shm path can be removed.
+ *
+ * Unfortunately, a flaw in the design of the sessiond's and
+ * consumerd's tear down of channels makes it impossible to
+ * determine when the sessiond _and_ the consumerd have both
+ * destroyed their representation of a channel. For one, the
+ * unlinking, close, and rmdir happen in deferred 'call_rcu'
+ * callbacks in both daemons.
+ *
+ * However, it is also impossible for the sessiond to know when
+ * the consumer daemon is done destroying its channel(s) since
+ * it occurs as a reaction to the closing of the channel's file
+ * descriptor. There is no resulting communication initiated
+ * from the consumerd to the sessiond to confirm that the
+ * operation is completed (and was successful).
+ *
+ * Until this is all fixed, the session daemon checks for the
+ * removal of the session's shm path which makes it possible
+ * to safely advertise a session as having been destroyed.
+ *
+ * Prior to this fix, it was not possible to reliably save
+ * a session making use of the --shm-path option, destroy it,
+ * and load it again. This is because the creation of the
+ * session would fail upon seeing the session's shm path
+ * already in existence.
+ *
+ * Note that none of the error paths in the check for the
+ * directory's existence return an error. This is normal
+ * as there isn't much that can be done. The session will
+ * be destroyed properly, except that we can't offer the
+ * guarantee that the same session can be re-created.
+ */
+ current_completion_handler = &destroy_completion_handler.handler;
+ ret = lttng_strncpy(destroy_completion_handler.shm_path,
+ session->shm_path,
+ sizeof(destroy_completion_handler.shm_path));
+ assert(!ret);
}
+ /*
+ * The session is destroyed. However, note that the command context
+ * still holds a reference to the session, thus delaying its destruction
+ * _at least_ up to the point when that reference is released.
+ */
+ session_destroy(session);
ret = LTTNG_OK;
-error:
return ret;
}
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;
}
* the buffer.
*/
cds_list_for_each_entry(session, &list->head, list) {
+ if (!session_get(session)) {
+ continue;
+ }
/*
* Only list the sessions the user can control.
*/
- if (!session_access_ok(session, uid, gid)) {
+ if (!session_access_ok(session, uid, gid) ||
+ session->destroyed) {
+ session_put(session);
continue;
}
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");
+ session_put(session);
continue;
}
sessions[i].snapshot_mode = session->snapshot_mode;
sessions[i].live_timer_interval = session->live_timer;
i++;
+ session_put(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;
}
}
+ /* A rotation is still pending, we have to wait. */
+ if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
+ 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) {
DBG("Cmd snapshot add output for session %s", session->name);
/*
- * Permission denied to create an output if the session is not
- * set in no output mode.
+ * Can't create an output if the session is not set in no-output mode.
*/
if (session->output_traces) {
- ret = LTTNG_ERR_EPERM;
+ ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
goto error;
}
* set in no output mode.
*/
if (session->output_traces) {
- ret = LTTNG_ERR_EPERM;
+ ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
goto error;
}
* set in no output mode.
*/
if (session->output_traces) {
- ret = -LTTNG_ERR_EPERM;
- goto error;
+ ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION;
+ goto end;
}
if (session->snapshot.nb_output == 0) {
ret = 0;
- goto error;
+ goto end;
}
list = zmalloc(session->snapshot.nb_output * sizeof(*list));
if (!list) {
ret = -LTTNG_ERR_NOMEM;
- goto error;
+ goto end;
}
/* Copy list from session to the new list object. */
}
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;
list = NULL;
ret = session->snapshot.nb_output;
error:
- free(list);
rcu_read_unlock();
+ free(list);
+end:
return ret;
}
* Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise.
*/
static
-int check_metadata_regenerate_support(struct ltt_session *session)
+int check_regenerate_metadata_support(struct ltt_session *session)
{
int ret;
}
static
-int ust_metadata_regenerate(struct ltt_ust_session *usess)
+int clear_metadata_file(int fd)
+{
+ int ret;
+ off_t lseek_ret;
+
+ lseek_ret = lseek(fd, 0, SEEK_SET);
+ if (lseek_ret < 0) {
+ PERROR("lseek");
+ ret = -1;
+ goto end;
+ }
+
+ ret = ftruncate(fd, 0);
+ if (ret < 0) {
+ PERROR("ftruncate");
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
+static
+int ust_regenerate_metadata(struct ltt_ust_session *usess)
{
int ret = 0;
struct buffer_reg_uid *uid_reg = NULL;
memset(registry->metadata, 0, registry->metadata_alloc_len);
registry->metadata_len = 0;
registry->metadata_version++;
+ if (registry->metadata_fd > 0) {
+ /* Clear the metadata file's content. */
+ ret = clear_metadata_file(registry->metadata_fd);
+ if (ret) {
+ pthread_mutex_unlock(®istry->lock);
+ goto end;
+ }
+ }
+
ret = ust_metadata_session_statedump(registry, NULL,
registry->major, registry->minor);
if (ret) {
}
/*
- * Command LTTNG_METADATA_REGENERATE from the lttng-ctl library.
+ * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library.
*
* Ask the consumer to truncate the existing metadata file(s) and
* then regenerate the metadata. Live and per-pid sessions are not
*
* Return 0 on success or else a LTTNG_ERR code.
*/
-int cmd_metadata_regenerate(struct ltt_session *session)
+int cmd_regenerate_metadata(struct ltt_session *session)
{
int ret;
assert(session);
- ret = check_metadata_regenerate_support(session);
+ ret = check_regenerate_metadata_support(session);
if (ret) {
goto end;
}
if (session->kernel_session) {
- ret = kernctl_session_metadata_regenerate(
+ ret = kernctl_session_regenerate_metadata(
session->kernel_session->fd);
if (ret < 0) {
ERR("Failed to regenerate the kernel metadata");
}
if (session->ust_session) {
- ret = ust_metadata_regenerate(session->ust_session);
+ ret = ust_regenerate_metadata(session->ust_session);
if (ret < 0) {
ERR("Failed to regenerate the UST metadata");
goto end;
return ret;
}
+/*
+ * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library.
+ *
+ * Ask the tracer to regenerate a new statedump.
+ *
+ * Return 0 on success or else a LTTNG_ERR code.
+ */
+int cmd_regenerate_statedump(struct ltt_session *session)
+{
+ int ret;
+
+ assert(session);
+
+ if (!session->active) {
+ ret = LTTNG_ERR_SESSION_NOT_STARTED;
+ goto end;
+ }
+
+ if (session->kernel_session) {
+ ret = kernctl_session_regenerate_statedump(
+ session->kernel_session->fd);
+ /*
+ * Currently, the statedump in kernel can only fail if out
+ * of memory.
+ */
+ if (ret < 0) {
+ if (ret == -ENOMEM) {
+ ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM;
+ } else {
+ ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL;
+ }
+ ERR("Failed to regenerate the kernel statedump");
+ goto end;
+ }
+ }
+
+ if (session->ust_session) {
+ ret = ust_app_regenerate_statedump_all(session->ust_session);
+ /*
+ * Currently, the statedump in UST always returns 0.
+ */
+ if (ret < 0) {
+ ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL;
+ ERR("Failed to regenerate the UST statedump");
+ goto end;
+ }
+ }
+ DBG("Cmd regenerate statedump for session %s", session->name);
+ ret = LTTNG_OK;
+
+end:
+ 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.
*
- * Return 0 on success or a LTTNG_ERR code.
+ * Return LTTNG_OK on success or a LTTNG_ERR code.
*/
-static int set_relayd_for_snapshot(struct consumer_output *consumer,
- struct snapshot_output *snap_output, struct ltt_session *session)
+static enum lttng_error_code set_relayd_for_snapshot(
+ struct consumer_output *consumer,
+ struct snapshot_output *snap_output,
+ struct ltt_session *session)
{
- int ret = LTTNG_OK;
+ enum lttng_error_code status = LTTNG_OK;
struct lttng_ht_iter iter;
struct consumer_socket *socket;
rcu_read_lock();
cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
socket, node.node) {
- ret = send_consumer_relayd_sockets(0, session->id,
+ pthread_mutex_lock(socket->lock);
+ status = send_consumer_relayd_sockets(0, session->id,
snap_output->consumer, socket,
session->name, session->hostname,
session->live_timer);
- if (ret != LTTNG_OK) {
+ pthread_mutex_unlock(socket->lock);
+ if (status != LTTNG_OK) {
rcu_read_unlock();
goto error;
}
rcu_read_unlock();
error:
- return ret;
+ return status;
}
/*
*
* Return LTTNG_OK on success or a LTTNG_ERR code.
*/
-static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
+static enum lttng_error_code record_kernel_snapshot(struct ltt_kernel_session *ksess,
struct snapshot_output *output, struct ltt_session *session,
int wait, uint64_t nb_packets_per_stream)
{
int ret;
+ enum lttng_error_code status;
assert(ksess);
assert(output);
assert(session);
-
/*
* Copy kernel session sockets so we can communicate with the right
* consumer for the snapshot record command.
*/
ret = consumer_copy_sockets(output->consumer, ksess->consumer);
if (ret < 0) {
- ret = LTTNG_ERR_NOMEM;
+ status = LTTNG_ERR_NOMEM;
goto error;
}
- ret = set_relayd_for_snapshot(ksess->consumer, output, session);
- if (ret != LTTNG_OK) {
+ status = set_relayd_for_snapshot(ksess->consumer, output, session);
+ if (status != LTTNG_OK) {
goto error_snapshot;
}
- ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream);
- if (ret != LTTNG_OK) {
+ status = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream);
+ if (status != LTTNG_OK) {
goto error_snapshot;
}
- ret = LTTNG_OK;
goto end;
error_snapshot:
consumer_destroy_output_sockets(output->consumer);
error:
end:
- return ret;
+ return status;
}
/*
* Record a UST snapshot.
*
- * Return 0 on success or a LTTNG_ERR error code.
+ * Returns LTTNG_OK on success or a LTTNG_ERR error code.
*/
-static int record_ust_snapshot(struct ltt_ust_session *usess,
+static enum lttng_error_code record_ust_snapshot(struct ltt_ust_session *usess,
struct snapshot_output *output, struct ltt_session *session,
int wait, uint64_t nb_packets_per_stream)
{
int ret;
+ enum lttng_error_code status;
assert(usess);
assert(output);
*/
ret = consumer_copy_sockets(output->consumer, usess->consumer);
if (ret < 0) {
- ret = LTTNG_ERR_NOMEM;
+ status = LTTNG_ERR_NOMEM;
goto error;
}
- ret = set_relayd_for_snapshot(usess->consumer, output, session);
- if (ret != LTTNG_OK) {
+ status = set_relayd_for_snapshot(usess->consumer, output, session);
+ if (status != LTTNG_OK) {
goto error_snapshot;
}
- ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream);
- if (ret < 0) {
- switch (-ret) {
- case EINVAL:
- ret = LTTNG_ERR_INVALID;
- break;
- default:
- ret = LTTNG_ERR_SNAPSHOT_FAIL;
- break;
- }
+ status = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream);
+ if (status != LTTNG_OK) {
goto error_snapshot;
}
- ret = LTTNG_OK;
-
error_snapshot:
/* Clean up copied sockets so this output can use some other later on. */
consumer_destroy_output_sockets(output->consumer);
error:
- return ret;
+ return status;
}
static
int cmd_snapshot_record(struct ltt_session *session,
struct lttng_snapshot_output *output, int wait)
{
- int ret = LTTNG_OK;
+ enum lttng_error_code cmd_ret = LTTNG_OK;
+ int ret;
unsigned int use_tmp_output = 0;
struct snapshot_output tmp_output;
unsigned int snapshot_success = 0;
ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime,
sizeof(datetime));
if (!ret) {
- ret = LTTNG_ERR_INVALID;
+ cmd_ret = LTTNG_ERR_INVALID;
goto error;
}
* set in no output mode.
*/
if (session->output_traces) {
- ret = LTTNG_ERR_EPERM;
+ cmd_ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
goto error;
}
/* The session needs to be started at least once. */
if (!session->has_been_started) {
- ret = LTTNG_ERR_START_SESSION_ONCE;
+ cmd_ret = LTTNG_ERR_START_SESSION_ONCE;
goto error;
}
&tmp_output, NULL);
if (ret < 0) {
if (ret == -ENOMEM) {
- ret = LTTNG_ERR_NOMEM;
+ cmd_ret = LTTNG_ERR_NOMEM;
} else {
- ret = LTTNG_ERR_INVALID;
+ cmd_ret = LTTNG_ERR_INVALID;
}
goto error;
}
nb_packets_per_stream = get_session_nb_packets_per_stream(session,
tmp_output.max_size);
if (nb_packets_per_stream < 0) {
- ret = LTTNG_ERR_MAX_SIZE_INVALID;
+ cmd_ret = LTTNG_ERR_MAX_SIZE_INVALID;
goto error;
}
if (session->kernel_session) {
- ret = record_kernel_snapshot(session->kernel_session,
+ cmd_ret = record_kernel_snapshot(session->kernel_session,
&tmp_output, session,
wait, nb_packets_per_stream);
- if (ret != LTTNG_OK) {
+ if (cmd_ret != LTTNG_OK) {
goto error;
}
}
if (session->ust_session) {
- ret = record_ust_snapshot(session->ust_session,
+ cmd_ret = record_ust_snapshot(session->ust_session,
&tmp_output, session,
wait, nb_packets_per_stream);
- if (ret != LTTNG_OK) {
+ if (cmd_ret != LTTNG_OK) {
goto error;
}
}
nb_packets_per_stream = get_session_nb_packets_per_stream(session,
tmp_output.max_size);
if (nb_packets_per_stream < 0) {
- ret = LTTNG_ERR_MAX_SIZE_INVALID;
+ cmd_ret = LTTNG_ERR_MAX_SIZE_INVALID;
rcu_read_unlock();
goto error;
}
/* Use temporary name. */
if (*output->name != '\0') {
- strncpy(tmp_output.name, output->name,
- sizeof(tmp_output.name));
+ if (lttng_strncpy(tmp_output.name, output->name,
+ sizeof(tmp_output.name))) {
+ cmd_ret = LTTNG_ERR_INVALID;
+ rcu_read_unlock();
+ goto error;
+ }
}
tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
memcpy(tmp_output.datetime, datetime, sizeof(datetime));
if (session->kernel_session) {
- ret = record_kernel_snapshot(session->kernel_session,
+ cmd_ret = record_kernel_snapshot(session->kernel_session,
&tmp_output, session,
wait, nb_packets_per_stream);
- if (ret != LTTNG_OK) {
+ if (cmd_ret != LTTNG_OK) {
rcu_read_unlock();
goto error;
}
}
if (session->ust_session) {
- ret = record_ust_snapshot(session->ust_session,
+ cmd_ret = record_ust_snapshot(session->ust_session,
&tmp_output, session,
wait, nb_packets_per_stream);
- if (ret != LTTNG_OK) {
+ if (cmd_ret != LTTNG_OK) {
rcu_read_unlock();
goto error;
}
if (snapshot_success) {
session->snapshot.nb_snapshot++;
} else {
- ret = LTTNG_ERR_SNAPSHOT_FAIL;
+ cmd_ret = LTTNG_ERR_SNAPSHOT_FAIL;
}
error:
- return ret;
+ return cmd_ret;
}
/*
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->snapshot_mode ||
+ !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:
+ return ret;
+}
+
+/*
+ * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library.
+ *
+ * Configure the automatic rotation parameters.
+ * 'activate' to true means activate the rotation schedule type with 'new_value'.
+ * 'activate' to false means deactivate the rotation schedule and validate that
+ * 'new_value' has the same value as the currently active value.
+ *
+ * Return 0 on success or else a positive LTTNG_ERR code.
+ */
+int cmd_rotation_set_schedule(struct ltt_session *session,
+ bool activate, enum lttng_rotation_schedule_type schedule_type,
+ uint64_t new_value,
+ struct notification_thread_handle *notification_thread_handle)
+{
+ int ret;
+ uint64_t *parameter_value;
+
+ assert(session);
+
+ DBG("Cmd rotate set schedule session %s", session->name);
+
+ if (session->live_timer || session->snapshot_mode ||
+ !session->output_traces) {
+ DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session");
+ ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE;
+ goto end;
+ }
+
+ switch (schedule_type) {
+ case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD:
+ parameter_value = &session->rotate_size;
+ break;
+ case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC:
+ parameter_value = &session->rotate_timer_period;
+ if (new_value >= UINT_MAX) {
+ DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64 " > %u (UINT_MAX)",
+ new_value, UINT_MAX);
+ ret = LTTNG_ERR_INVALID;
+ goto end;
+ }
+ break;
+ default:
+ WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type");
+ ret = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /* Improper use of the API. */
+ if (new_value == -1ULL) {
+ WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1");
+ ret = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /*
+ * As indicated in struct ltt_session's comments, a value of == 0 means
+ * this schedule rotation type is not in use.
+ *
+ * Reject the command if we were asked to activate a schedule that was
+ * already active.
+ */
+ if (activate && *parameter_value != 0) {
+ DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active");
+ ret = LTTNG_ERR_ROTATION_SCHEDULE_SET;
+ goto end;
+ }
+
+ /*
+ * Reject the command if we were asked to deactivate a schedule that was
+ * not active.
+ */
+ if (!activate && *parameter_value == 0) {
+ DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive");
+ ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET;
+ goto end;
+ }
+
+ /*
+ * Reject the command if we were asked to deactivate a schedule that
+ * doesn't exist.
+ */
+ if (!activate && *parameter_value != new_value) {
+ DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided");
+ ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET;
+ goto end;
+ }
+
+ *parameter_value = activate ? new_value : 0;
+
+ switch (schedule_type) {
+ case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC:
+ if (activate && session->active) {
+ /*
+ * Only start the timer if the session is active,
+ * otherwise it will be started when the session starts.
+ */
+ ret = timer_session_rotation_schedule_timer_start(
+ session, new_value);
+ if (ret) {
+ ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command");
+ ret = LTTNG_ERR_UNK;
+ goto end;
+ }
+ } else {
+ ret = timer_session_rotation_schedule_timer_stop(
+ session);
+ if (ret) {
+ ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command");
+ ret = LTTNG_ERR_UNK;
+ goto end;
+ }
+ }
+ break;
+ case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD:
+ if (activate) {
+ ret = subscribe_session_consumed_size_rotation(session,
+ new_value, notification_thread_handle);
+ if (ret) {
+ ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command");
+ ret = LTTNG_ERR_UNK;
+ goto end;
+ }
+ } else {
+ ret = unsubscribe_session_consumed_size_rotation(session,
+ notification_thread_handle);
+ if (ret) {
+ ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command");
+ ret = LTTNG_ERR_UNK;
+ goto end;
+ }
+
+ }
+ break;
+ default:
+ /* Would have been caught before. */
+ abort();
+ }
+
+ ret = LTTNG_OK;
+
+ goto end;
+
+end:
+ return ret;
+}
+
+/* Wait for a given path to be removed before continuing. */
+static enum lttng_error_code wait_on_path(void *path_data)
+{
+ const char *shm_path = path_data;
+
+ DBG("Waiting for the shm path at %s to be removed before completing session destruction",
+ shm_path);
+ while (true) {
+ int ret;
+ struct stat st;
+
+ ret = stat(shm_path, &st);
+ if (ret) {
+ if (errno != ENOENT) {
+ PERROR("stat() returned an error while checking for the existence of the shm path");
+ } else {
+ DBG("shm path no longer exists, completing the destruction of session");
+ }
+ break;
+ } else {
+ if (!S_ISDIR(st.st_mode)) {
+ ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal",
+ shm_path);
+ break;
+ }
+ }
+ usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US);
+ }
+ return LTTNG_OK;
+}
+
+/*
+ * Returns a pointer to a handler to run on completion of a command.
+ * Returns NULL if no handler has to be run for the last command executed.
+ */
+const struct cmd_completion_handler *cmd_pop_completion_handler(void)
+{
+ struct cmd_completion_handler *handler = current_completion_handler;
+
+ current_completion_handler = NULL;
+ return handler;
+}
+
/*
* Init command subsystem.
*/
projects / lttng-tools.git / blobdiff