*/
#define _GNU_SOURCE
+#define _LGPL_SOURCE
#include <assert.h>
+#include <inttypes.h>
#include <urcu/list.h>
#include <urcu/uatomic.h>
#include <common/common.h>
#include <common/sessiond-comm/sessiond-comm.h>
#include <common/relayd/relayd.h>
+#include <common/utils.h>
#include "channel.h"
#include "consumer.h"
#include "event.h"
+#include "health-sessiond.h"
#include "kernel.h"
#include "kernel-consumer.h"
#include "lttng-sessiond.h"
#include "utils.h"
+#include "syscall.h"
#include "cmd.h"
/*
* 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
- * to send to.
- *
- * This value should be incremented atomically for safety purposes and future
- * possible concurrent access.
+ * to send to. It must be accessed with the relayd_net_seq_idx_lock
+ * held.
+ */
+static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
+static uint64_t relayd_net_seq_idx;
+
+/*
+ * Both functions below are special case for the Kernel domain when
+ * enabling/disabling all events.
*/
-static unsigned int relayd_net_seq_idx;
+static
+int enable_kevent_all(struct ltt_session *session,
+ struct lttng_domain *domain, char *channel_name,
+ struct lttng_event *event,
+ char *filter_expression,
+ struct lttng_filter_bytecode *filter, int wpipe);
+static
+int disable_kevent_all(struct ltt_session *session, int domain,
+ char *channel_name,
+ struct lttng_event *event);
/*
* Create a session path used by list_lttng_sessions for the case that the
tmp_urls, kdata_port, tmp_uurl, udata_port);
} else {
int dport;
- if (kuri) {
+ if (kuri || (!kuri && !uuri)) {
dport = kdata_port;
} else {
/* No kernel URI, use the UST port. */
channels[i].attr.read_timer_interval =
uchan->attr.read_timer_interval;
channels[i].enabled = uchan->enabled;
+ channels[i].attr.tracefile_size = uchan->tracefile_size;
+ channels[i].attr.tracefile_count = uchan->tracefile_count;
switch (uchan->attr.output) {
case LTTNG_UST_MMAP:
default:
}
}
+/*
+ * Create a list of agent domain events.
+ *
+ * Return number of events in list on success or else a negative value.
+ */
+static int list_lttng_agent_events(struct agent *agt,
+ struct lttng_event **events)
+{
+ int i = 0, ret = 0;
+ unsigned int nb_event = 0;
+ struct agent_event *event;
+ struct lttng_event *tmp_events;
+ struct lttng_ht_iter iter;
+
+ assert(agt);
+ assert(events);
+
+ DBG3("Listing agent events");
+
+ rcu_read_lock();
+ nb_event = lttng_ht_get_count(agt->events);
+ rcu_read_unlock();
+ if (nb_event == 0) {
+ ret = nb_event;
+ goto error;
+ }
+
+ tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
+ if (!tmp_events) {
+ PERROR("zmalloc agent events session");
+ ret = -LTTNG_ERR_FATAL;
+ goto error;
+ }
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
+ strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
+ tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
+ tmp_events[i].enabled = event->enabled;
+ tmp_events[i].loglevel = event->loglevel;
+ tmp_events[i].loglevel_type = event->loglevel_type;
+ i++;
+ }
+ rcu_read_unlock();
+
+ *events = tmp_events;
+ ret = nb_event;
+
+error:
+ assert(nb_event == i);
+ return ret;
+}
+
/*
* Create a list of ust global domain events.
*/
if (uevent->filter) {
tmp[i].filter = 1;
}
+ if (uevent->exclusion) {
+ tmp[i].exclusion = 1;
+ }
i++;
}
DBG("Listing events for channel %s", kchan->channel->name);
if (nb_event == 0) {
- goto end;
+ *events = NULL;
+ goto syscall;
}
*events = zmalloc(nb_event * sizeof(struct lttng_event));
case LTTNG_KERNEL_TRACEPOINT:
(*events)[i].type = LTTNG_EVENT_TRACEPOINT;
break;
- case LTTNG_KERNEL_KPROBE:
case LTTNG_KERNEL_KRETPROBE:
+ (*events)[i].type = LTTNG_EVENT_FUNCTION;
+ memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
+ sizeof(struct lttng_kernel_kprobe));
+ break;
+ case LTTNG_KERNEL_KPROBE:
(*events)[i].type = LTTNG_EVENT_PROBE;
memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
sizeof(struct lttng_kernel_kprobe));
i++;
}
-end:
+syscall:
+ if (syscall_table) {
+ ssize_t new_size;
+
+ new_size = syscall_list_channel(kchan, events, nb_event);
+ if (new_size < 0) {
+ free(events);
+ ret = -new_size;
+ goto error;
+ }
+ nb_event = new_size;
+ }
+
return nb_event;
error:
case LTTNG_DST_IPV6:
DBG2("Setting network URI to consumer");
+ if (consumer->type == CONSUMER_DST_NET) {
+ if ((uri->stype == LTTNG_STREAM_CONTROL &&
+ consumer->dst.net.control_isset) ||
+ (uri->stype == LTTNG_STREAM_DATA &&
+ consumer->dst.net.data_isset)) {
+ ret = LTTNG_ERR_URL_EXIST;
+ goto error;
+ }
+ } else {
+ memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
+ }
+
consumer->type = CONSUMER_DST_NET;
/* Set URI into consumer output object */
ret = consumer_set_network_uri(consumer, uri);
if (ret < 0) {
- ret = LTTNG_ERR_FATAL;
+ ret = -ret;
goto error;
} else if (ret == 1) {
/*
* URI was the same in the consumer so we do not append the subdir
* again so to not duplicate output dir.
*/
+ ret = LTTNG_OK;
goto error;
}
break;
}
+ ret = LTTNG_OK;
+
error:
return ret;
}
if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
socket, node.node) {
- /* Code flow error */
- assert(socket->fd >= 0);
-
pthread_mutex_lock(socket->lock);
ret = kernel_consumer_send_session(socket, session);
pthread_mutex_unlock(socket->lock);
* On success, the relayd_sock pointer is set to the created socket.
* Else, it's stays untouched and a lttcomm error code is returned.
*/
-static int create_connect_relayd(struct consumer_output *output,
- const char *session_name, struct lttng_uri *uri,
- struct lttcomm_sock **relayd_sock)
+static int create_connect_relayd(struct lttng_uri *uri,
+ struct lttcomm_relayd_sock **relayd_sock)
{
int ret;
- struct lttcomm_sock *sock;
-
- /* Create socket object from URI */
- sock = lttcomm_alloc_sock_from_uri(uri);
- if (sock == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
+ struct lttcomm_relayd_sock *rsock;
- ret = lttcomm_create_sock(sock);
- if (ret < 0) {
+ rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
+ RELAYD_VERSION_COMM_MINOR);
+ if (!rsock) {
ret = LTTNG_ERR_FATAL;
goto error;
}
* state to be in poll execution.
*/
health_poll_entry();
- ret = relayd_connect(sock);
+ ret = relayd_connect(rsock);
health_poll_exit();
if (ret < 0) {
ERR("Unable to reach lttng-relayd");
DBG3("Creating relayd stream socket from URI");
/* Check relayd version */
- ret = relayd_version_check(sock, RELAYD_VERSION_COMM_MAJOR,
- RELAYD_VERSION_COMM_MINOR);
+ ret = relayd_version_check(rsock);
if (ret < 0) {
ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
goto close_sock;
goto close_sock;
}
- *relayd_sock = sock;
+ *relayd_sock = rsock;
return LTTNG_OK;
close_sock:
- if (sock) {
- (void) relayd_close(sock);
- }
+ /* The returned value is not useful since we are on an error path. */
+ (void) relayd_close(rsock);
free_sock:
- if (sock) {
- lttcomm_destroy_sock(sock);
- }
+ free(rsock);
error:
return ret;
}
/*
* Connect to the relayd using URI and send the socket to the right consumer.
*/
-static int send_consumer_relayd_socket(int domain, struct ltt_session *session,
+static int send_consumer_relayd_socket(int domain, unsigned int session_id,
struct lttng_uri *relayd_uri, struct consumer_output *consumer,
- struct consumer_socket *consumer_sock)
+ struct consumer_socket *consumer_sock,
+ char *session_name, char *hostname, int session_live_timer)
{
int ret;
- struct lttcomm_sock *sock = NULL;
+ struct lttcomm_relayd_sock *rsock = NULL;
/* Connect to relayd and make version check if uri is the control. */
- ret = create_connect_relayd(consumer, session->name, relayd_uri, &sock);
+ ret = create_connect_relayd(relayd_uri, &rsock);
if (ret != LTTNG_OK) {
- goto close_sock;
- }
-
- /* If the control socket is connected, network session is ready */
- if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
- session->net_handle = 1;
+ goto error;
}
+ assert(rsock);
/* Set the network sequence index if not set. */
- if (consumer->net_seq_index == -1) {
+ if (consumer->net_seq_index == (uint64_t) -1ULL) {
+ pthread_mutex_lock(&relayd_net_seq_idx_lock);
/*
* Increment net_seq_idx because we are about to transfer the
* new relayd socket to the consumer.
+ * Assign unique key so the consumer can match streams.
*/
- uatomic_inc(&relayd_net_seq_idx);
- /* Assign unique key so the consumer can match streams */
- uatomic_set(&consumer->net_seq_index,
- uatomic_read(&relayd_net_seq_idx));
+ consumer->net_seq_index = ++relayd_net_seq_idx;
+ pthread_mutex_unlock(&relayd_net_seq_idx_lock);
}
/* Send relayd socket to consumer. */
- ret = consumer_send_relayd_socket(consumer_sock, sock,
- consumer, relayd_uri->stype, session->id);
+ ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
+ relayd_uri->stype, session_id,
+ session_name, hostname, session_live_timer);
if (ret < 0) {
ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
goto close_sock;
*/
close_sock:
- if (sock) {
- (void) relayd_close(sock);
- lttcomm_destroy_sock(sock);
- }
+ (void) relayd_close(rsock);
+ free(rsock);
+error:
if (ret != LTTNG_OK) {
/*
- * On error, nullify the consumer sequence index so streams are not
- * associated with it once sent to the consumer.
+ * The consumer output for this session should not be used anymore
+ * since the relayd connection failed thus making any tracing or/and
+ * streaming not usable.
*/
- uatomic_set(&consumer->net_seq_index, -1);
+ consumer->enabled = 0;
}
-
return ret;
}
* helper function to facilitate sending the information to the consumer for a
* session.
*/
-static int send_consumer_relayd_sockets(int domain,
- struct ltt_session *session, struct consumer_output *consumer,
- struct consumer_socket *sock)
+static int send_consumer_relayd_sockets(int 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;
- assert(session);
assert(consumer);
+ assert(sock);
/* Sending control relayd socket. */
if (!sock->control_sock_sent) {
- ret = send_consumer_relayd_socket(domain, session,
- &consumer->dst.net.control, consumer, sock);
+ ret = send_consumer_relayd_socket(domain, session_id,
+ &consumer->dst.net.control, consumer, sock,
+ session_name, hostname, session_live_timer);
if (ret != LTTNG_OK) {
goto error;
}
/* Sending data relayd socket. */
if (!sock->data_sock_sent) {
- ret = send_consumer_relayd_socket(domain, session,
- &consumer->dst.net.data, consumer, sock);
+ ret = send_consumer_relayd_socket(domain, session_id,
+ &consumer->dst.net.data, consumer, sock,
+ session_name, hostname, session_live_timer);
if (ret != LTTNG_OK) {
goto error;
}
usess = session->ust_session;
ksess = session->kernel_session;
- DBG2("Setting relayd for session %s", session->name);
+ DBG("Setting relayd for session %s", session->name);
rcu_read_lock();
/* For each consumer socket, send relayd sockets */
cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
socket, node.node) {
- /* Code flow error */
- assert(socket->fd >= 0);
-
pthread_mutex_lock(socket->lock);
- ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session,
- usess->consumer, socket);
+ ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
+ usess->consumer, socket,
+ session->name, session->hostname,
+ session->live_timer);
pthread_mutex_unlock(socket->lock);
if (ret != LTTNG_OK) {
goto error;
}
+ /* Session is now ready for network streaming. */
+ session->net_handle = 1;
}
}
&& ksess->consumer->enabled) {
cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
socket, node.node) {
- /* Code flow error */
- assert(socket->fd >= 0);
-
pthread_mutex_lock(socket->lock);
- ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session,
- ksess->consumer, socket);
+ ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
+ ksess->consumer, socket,
+ session->name, session->hostname,
+ session->live_timer);
pthread_mutex_unlock(socket->lock);
if (ret != LTTNG_OK) {
goto error;
}
+ /* Session is now ready for network streaming. */
+ session->net_handle = 1;
}
}
struct ltt_kernel_channel *kchan;
/* Open kernel metadata */
- if (ksess->metadata == NULL) {
+ if (ksess->metadata == NULL && ksess->output_traces) {
ret = kernel_open_metadata(ksess);
if (ret < 0) {
ret = LTTNG_ERR_KERN_META_FAIL;
}
/* Open kernel metadata stream */
- if (ksess->metadata_stream_fd < 0) {
+ if (ksess->metadata && ksess->metadata_stream_fd < 0) {
ret = kernel_open_metadata_stream(ksess);
if (ret < 0) {
ERR("Kernel create metadata stream failed");
/* Setup kernel consumer socket and send fds to it */
ret = init_kernel_tracing(ksess);
- if (ret < 0) {
+ if (ret != 0) {
ret = LTTNG_ERR_KERN_START_FAIL;
goto error;
}
/* Quiescent wait after starting trace */
kernel_wait_quiescent(kernel_tracer_fd);
- ksess->started = 1;
+ ksess->active = 1;
ret = LTTNG_OK;
goto error;
}
- ret = channel_ust_disable(usess, domain, uchan);
+ ret = channel_ust_disable(usess, uchan);
if (ret != LTTNG_OK) {
goto error;
}
* The wpipe arguments is used as a notifier for the kernel thread.
*/
int cmd_enable_channel(struct ltt_session *session,
- int domain, struct lttng_channel *attr, int wpipe)
+ struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
{
int ret;
struct ltt_ust_session *usess = session->ust_session;
assert(session);
assert(attr);
+ assert(domain);
DBG("Enabling channel %s for session %s", attr->name, session->name);
rcu_read_lock();
- switch (domain) {
+ /*
+ * Don't try to enable a channel if the session has been started at
+ * some point in time before. The tracer does not allow it.
+ */
+ if (session->has_been_started) {
+ ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
+ goto error;
+ }
+
+ /*
+ * If the session is a live session, remove the switch timer, the
+ * live timer does the same thing but sends also synchronisation
+ * beacons for inactive streams.
+ */
+ if (session->live_timer > 0) {
+ attr->attr.live_timer_interval = session->live_timer;
+ 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;
+ goto error;
+ }
+
+ switch (domain->type) {
case LTTNG_DOMAIN_KERNEL:
{
struct ltt_kernel_channel *kchan;
session->kernel_session);
if (kchan == NULL) {
ret = channel_kernel_create(session->kernel_session, attr, wpipe);
+ if (attr->name[0] != '\0') {
+ session->kernel_session->has_non_default_channel = 1;
+ }
} else {
ret = channel_kernel_enable(session->kernel_session, kchan);
}
}
kernel_wait_quiescent(kernel_tracer_fd);
-
- /*
- * If the session was previously started, start as well this newly
- * created kernel session so the events/channels enabled *after* the
- * start actually work.
- */
- if (session->started && !session->kernel_session->started) {
- ret = start_kernel_session(session->kernel_session, wpipe);
- if (ret != LTTNG_OK) {
- goto error;
- }
- }
break;
}
case LTTNG_DOMAIN_UST:
uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
if (uchan == NULL) {
- ret = channel_ust_create(usess, domain, attr);
- } else {
- ret = channel_ust_enable(usess, domain, uchan);
- }
-
- /* Start the UST session if the session was already started. */
- if (session->started && !usess->start_trace) {
- ret = ust_app_start_trace_all(usess);
- if (ret < 0) {
- ret = LTTNG_ERR_UST_START_FAIL;
- goto error;
+ ret = channel_ust_create(usess, attr, domain->buf_type);
+ if (attr->name[0] != '\0') {
+ usess->has_non_default_channel = 1;
}
- ret = LTTNG_OK;
- usess->start_trace = 1;
+ } else {
+ ret = channel_ust_enable(usess, uchan);
}
break;
}
-#if 0
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
-#endif
default:
ret = LTTNG_ERR_UNKNOWN_DOMAIN;
goto error;
* Command LTTNG_DISABLE_EVENT processed by the client thread.
*/
int cmd_disable_event(struct ltt_session *session, int domain,
- char *channel_name, char *event_name)
+ char *channel_name,
+ struct lttng_event *event)
{
int ret;
+ char *event_name;
+
+ DBG("Disable event command for event \'%s\'", event->name);
+
+ event_name = event->name;
+
+ /* Error out on unhandled search criteria */
+ if (event->loglevel_type || event->loglevel != -1 || event->enabled
+ || event->pid || event->filter || event->exclusion) {
+ return LTTNG_ERR_UNK;
+ }
+ /* Special handling for kernel domain all events. */
+ if (domain == LTTNG_DOMAIN_KERNEL && !strcmp(event_name, "*")) {
+ return disable_kevent_all(session, domain, channel_name, event);
+ }
rcu_read_lock();
ksess = session->kernel_session;
+ /*
+ * If a non-default channel has been created in the
+ * session, explicitely require that -c chan_name needs
+ * to be provided.
+ */
+ if (ksess->has_non_default_channel && channel_name[0] == '\0') {
+ ret = LTTNG_ERR_NEED_CHANNEL_NAME;
+ goto error;
+ }
+
kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
if (kchan == NULL) {
ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
goto error;
}
- ret = event_kernel_disable_tracepoint(kchan, event_name);
- if (ret != LTTNG_OK) {
+ switch (event->type) {
+ case LTTNG_EVENT_ALL:
+ case LTTNG_EVENT_TRACEPOINT:
+ ret = event_kernel_disable_tracepoint(kchan, event_name);
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
+ break;
+ case LTTNG_EVENT_SYSCALL:
+ ret = event_kernel_disable_syscall(kchan, event_name);
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
+ break;
+ default:
+ ret = LTTNG_ERR_UNK;
goto error;
}
usess = session->ust_session;
+ /*
+ * If a non-default channel has been created in the
+ * session, explicitely require that -c chan_name needs
+ * to be provided.
+ */
+ if (usess->has_non_default_channel && channel_name[0] == '\0') {
+ ret = LTTNG_ERR_NEED_CHANNEL_NAME;
+ goto error;
+ }
+
uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
channel_name);
if (uchan == NULL) {
goto error;
}
- ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
- if (ret != LTTNG_OK) {
+ switch (event->type) {
+ case LTTNG_EVENT_ALL:
+ ret = event_ust_disable_tracepoint(usess, uchan, event_name);
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
+ break;
+ default:
+ ret = LTTNG_ERR_UNK;
goto error;
}
channel_name);
break;
}
+ case LTTNG_DOMAIN_LOG4J:
+ case LTTNG_DOMAIN_JUL:
+ case LTTNG_DOMAIN_PYTHON:
+ {
+ struct agent *agt;
+ struct ltt_ust_session *usess = session->ust_session;
+
+ assert(usess);
+
+ switch (event->type) {
+ case LTTNG_EVENT_ALL:
+ break;
+ default:
+ ret = LTTNG_ERR_UNK;
+ goto error;
+ }
+
+ agt = trace_ust_find_agent(usess, domain);
+ if (!agt) {
+ ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
+ goto error;
+ }
+ /* The wild card * means that everything should be disabled. */
+ if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
+ ret = event_agent_disable_all(usess, agt);
+ } else {
+ ret = event_agent_disable(usess, agt, event_name);
+ }
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
+
+ break;
+ }
#if 0
case LTTNG_DOMAIN_UST_EXEC_NAME:
case LTTNG_DOMAIN_UST_PID:
}
/*
- * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
+ * Command LTTNG_DISABLE_EVENT for event "*" processed by the client thread.
*/
-int cmd_disable_event_all(struct ltt_session *session, int domain,
- char *channel_name)
+static
+int disable_kevent_all(struct ltt_session *session, int domain,
+ char *channel_name,
+ struct lttng_event *event)
{
int ret;
ksess = session->kernel_session;
+ /*
+ * If a non-default channel has been created in the
+ * session, explicitely require that -c chan_name needs
+ * to be provided.
+ */
+ if (ksess->has_non_default_channel && channel_name[0] == '\0') {
+ ret = LTTNG_ERR_NEED_CHANNEL_NAME;
+ goto error;
+ }
+
kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
if (kchan == NULL) {
ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
goto error;
}
- ret = event_kernel_disable_all(kchan);
- if (ret != LTTNG_OK) {
+ switch (event->type) {
+ case LTTNG_EVENT_ALL:
+ ret = event_kernel_disable_all(kchan);
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
+ break;
+ case LTTNG_EVENT_SYSCALL:
+ ret = event_kernel_disable_syscall(kchan, "");
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
+ break;
+ default:
+ ret = LTTNG_ERR_UNK;
goto error;
}
kernel_wait_quiescent(kernel_tracer_fd);
break;
}
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_session *usess;
- struct ltt_ust_channel *uchan;
-
- usess = session->ust_session;
-
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
- if (ret != 0) {
- goto error;
- }
-
- DBG3("Disable all UST events in channel %s completed", channel_name);
-
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
default:
ret = LTTNG_ERR_UND;
goto error;
int cmd_add_context(struct ltt_session *session, int domain,
char *channel_name, struct lttng_event_context *ctx, int kwpipe)
{
- int ret;
+ int ret, chan_kern_created = 0, chan_ust_created = 0;
switch (domain) {
case LTTNG_DOMAIN_KERNEL:
if (ret != LTTNG_OK) {
goto error;
}
+ chan_kern_created = 1;
}
-
/* Add kernel context to kernel tracer */
ret = context_kernel_add(session->kernel_session, ctx, channel_name);
if (ret != LTTNG_OK) {
case LTTNG_DOMAIN_UST:
{
struct ltt_ust_session *usess = session->ust_session;
+ unsigned int chan_count;
+
assert(usess);
- unsigned int chan_count =
- lttng_ht_get_count(usess->domain_global.channels);
+ chan_count = lttng_ht_get_count(usess->domain_global.channels);
if (chan_count == 0) {
struct lttng_channel *attr;
/* Create default channel */
- attr = channel_new_default_attr(domain);
+ attr = channel_new_default_attr(domain, usess->buffer_type);
if (attr == NULL) {
ret = LTTNG_ERR_FATAL;
goto error;
}
- ret = channel_ust_create(usess, domain, attr);
+ ret = channel_ust_create(usess, attr, usess->buffer_type);
if (ret != LTTNG_OK) {
free(attr);
goto error;
}
free(attr);
+ chan_ust_created = 1;
}
ret = context_ust_add(usess, domain, ctx, channel_name);
goto error;
}
- ret = LTTNG_OK;
+ return LTTNG_OK;
error:
+ if (chan_kern_created) {
+ struct ltt_kernel_channel *kchan =
+ trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
+ session->kernel_session);
+ /* Created previously, this should NOT fail. */
+ assert(kchan);
+ kernel_destroy_channel(kchan);
+ }
+
+ if (chan_ust_created) {
+ struct ltt_ust_channel *uchan =
+ trace_ust_find_channel_by_name(
+ session->ust_session->domain_global.channels,
+ DEFAULT_CHANNEL_NAME);
+ /* Created previously, this should NOT fail. */
+ assert(uchan);
+ /* Remove from the channel list of the session. */
+ trace_ust_delete_channel(session->ust_session->domain_global.channels,
+ uchan);
+ trace_ust_destroy_channel(uchan);
+ }
+ 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;
+
+ /*
+ * 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':
+ 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:
return ret;
}
/*
* Command LTTNG_ENABLE_EVENT processed by the client thread.
+ * We own filter, exclusion, and filter_expression.
*/
-int cmd_enable_event(struct ltt_session *session, int domain,
+int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
char *channel_name, struct lttng_event *event,
- struct lttng_filter_bytecode *filter, int wpipe)
+ char *filter_expression,
+ struct lttng_filter_bytecode *filter,
+ struct lttng_event_exclusion *exclusion,
+ int wpipe)
{
int ret, channel_created = 0;
struct lttng_channel *attr;
assert(event);
assert(channel_name);
+ DBG("Enable event command for event \'%s\'", event->name);
+
+ /* Special handling for kernel domain all events. */
+ if (domain->type == LTTNG_DOMAIN_KERNEL && !strcmp(event->name, "*")) {
+ return enable_kevent_all(session, domain, channel_name, event,
+ filter_expression, filter, wpipe);
+ }
+
+ ret = validate_event_name(event->name);
+ if (ret) {
+ goto error;
+ }
+
rcu_read_lock();
- switch (domain) {
+ switch (domain->type) {
case LTTNG_DOMAIN_KERNEL:
{
struct ltt_kernel_channel *kchan;
+ /*
+ * If a non-default channel has been created in the
+ * session, explicitely require that -c chan_name needs
+ * to be provided.
+ */
+ if (session->kernel_session->has_non_default_channel
+ && channel_name[0] == '\0') {
+ ret = LTTNG_ERR_NEED_CHANNEL_NAME;
+ goto error;
+ }
+
kchan = trace_kernel_get_channel_by_name(channel_name,
session->kernel_session);
if (kchan == NULL) {
- attr = channel_new_default_attr(domain);
+ attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
+ LTTNG_BUFFER_GLOBAL);
if (attr == NULL) {
ret = LTTNG_ERR_FATAL;
goto error;
goto error;
}
- ret = event_kernel_enable_tracepoint(kchan, event);
- if (ret != LTTNG_OK) {
- if (channel_created) {
- /* Let's not leak a useless channel. */
- kernel_destroy_channel(kchan);
+ switch (event->type) {
+ case LTTNG_EVENT_ALL:
+ case LTTNG_EVENT_PROBE:
+ case LTTNG_EVENT_FUNCTION:
+ case LTTNG_EVENT_FUNCTION_ENTRY:
+ case LTTNG_EVENT_TRACEPOINT:
+ ret = event_kernel_enable_tracepoint(kchan, event);
+ if (ret != LTTNG_OK) {
+ if (channel_created) {
+ /* Let's not leak a useless channel. */
+ kernel_destroy_channel(kchan);
+ }
+ goto error;
}
+ break;
+ case LTTNG_EVENT_SYSCALL:
+ ret = event_kernel_enable_syscall(kchan, event->name);
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
+ break;
+ default:
+ ret = LTTNG_ERR_UNK;
goto error;
}
assert(usess);
+ /*
+ * If a non-default channel has been created in the
+ * session, explicitely require that -c chan_name needs
+ * to be provided.
+ */
+ if (usess->has_non_default_channel && channel_name[0] == '\0') {
+ ret = LTTNG_ERR_NEED_CHANNEL_NAME;
+ goto error;
+ }
+
/* Get channel from global UST domain */
uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
channel_name);
if (uchan == NULL) {
/* Create default channel */
- attr = channel_new_default_attr(domain);
+ attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
+ usess->buffer_type);
if (attr == NULL) {
ret = LTTNG_ERR_FATAL;
goto error;
}
/* At this point, the session and channel exist on the tracer */
- ret = event_ust_enable_tracepoint(usess, domain, uchan, event, filter);
+ ret = event_ust_enable_tracepoint(usess, uchan, event,
+ filter_expression, filter, exclusion);
+ /* We have passed ownership */
+ filter_expression = NULL;
+ filter = NULL;
+ exclusion = NULL;
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
+ break;
+ }
+ case LTTNG_DOMAIN_LOG4J:
+ case LTTNG_DOMAIN_JUL:
+ case LTTNG_DOMAIN_PYTHON:
+ {
+ const char *default_event_name, *default_chan_name;
+ struct agent *agt;
+ struct lttng_event uevent;
+ struct lttng_domain tmp_dom;
+ struct ltt_ust_session *usess = session->ust_session;
+
+ assert(usess);
+
+ agt = trace_ust_find_agent(usess, domain->type);
+ if (!agt) {
+ agt = agent_create(domain->type);
+ if (!agt) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto error;
+ }
+ agent_add(agt, usess->agents);
+ }
+
+ /* Create the default tracepoint. */
+ memset(&uevent, 0, sizeof(uevent));
+ uevent.type = LTTNG_EVENT_TRACEPOINT;
+ uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
+ default_event_name = event_get_default_agent_ust_name(domain->type);
+ if (!default_event_name) {
+ ret = -LTTNG_ERR_FATAL;
+ goto error;
+ }
+ strncpy(uevent.name, default_event_name, sizeof(uevent.name));
+ uevent.name[sizeof(uevent.name) - 1] = '\0';
+
+ /*
+ * The domain type is changed because we are about to enable the
+ * default channel and event for the JUL domain that are hardcoded.
+ * This happens in the UST domain.
+ */
+ memcpy(&tmp_dom, domain, sizeof(tmp_dom));
+ tmp_dom.type = LTTNG_DOMAIN_UST;
+
+ switch (domain->type) {
+ case LTTNG_DOMAIN_LOG4J:
+ default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
+ break;
+ case LTTNG_DOMAIN_JUL:
+ default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
+ break;
+ case LTTNG_DOMAIN_PYTHON:
+ default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
+ break;
+ default:
+ /* The switch/case we are in should avoid this else big problem */
+ assert(0);
+ }
+
+ {
+ struct lttng_filter_bytecode *filter_copy = NULL;
+
+ if (filter) {
+ filter_copy = zmalloc(
+ sizeof(struct lttng_filter_bytecode)
+ + filter->len);
+ if (!filter_copy) {
+ goto error;
+ }
+
+ memcpy(filter_copy, filter,
+ sizeof(struct lttng_filter_bytecode)
+ + filter->len);
+ }
+
+ ret = cmd_enable_event(session, &tmp_dom,
+ (char *) default_chan_name,
+ &uevent, filter_expression, filter_copy,
+ NULL, wpipe);
+ /* We have passed ownership */
+ filter_expression = NULL;
+ }
+
+ if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
+ goto error;
+ }
+
+ /* The wild card * means that everything should be enabled. */
+ if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
+ ret = event_agent_enable_all(usess, agt, event, filter);
+ filter = NULL;
+ } else {
+ ret = event_agent_enable(usess, agt, event, filter);
+ filter = NULL;
+ }
if (ret != LTTNG_OK) {
goto error;
}
+
break;
}
#if 0
ret = LTTNG_OK;
error:
+ free(filter_expression);
+ free(filter);
+ free(exclusion);
rcu_read_unlock();
return ret;
}
/*
- * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
+ * Command LTTNG_ENABLE_EVENT for event "*" processed by the client thread.
*/
-int cmd_enable_event_all(struct ltt_session *session, int domain,
- char *channel_name, int event_type,
+static
+int enable_kevent_all(struct ltt_session *session,
+ struct lttng_domain *domain, char *channel_name,
+ struct lttng_event *event,
+ char *filter_expression,
struct lttng_filter_bytecode *filter, int wpipe)
{
int ret;
rcu_read_lock();
- switch (domain) {
+ switch (domain->type) {
case LTTNG_DOMAIN_KERNEL:
{
struct ltt_kernel_channel *kchan;
assert(session->kernel_session);
+ /*
+ * If a non-default channel has been created in the
+ * session, explicitely require that -c chan_name needs
+ * to be provided.
+ */
+ if (session->kernel_session->has_non_default_channel
+ && channel_name[0] == '\0') {
+ ret = LTTNG_ERR_NEED_CHANNEL_NAME;
+ goto error;
+ }
+
kchan = trace_kernel_get_channel_by_name(channel_name,
session->kernel_session);
if (kchan == NULL) {
/* Create default channel */
- attr = channel_new_default_attr(domain);
+ attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
+ LTTNG_BUFFER_GLOBAL);
if (attr == NULL) {
ret = LTTNG_ERR_FATAL;
goto error;
assert(kchan);
}
- switch (event_type) {
+ switch (event->type) {
case LTTNG_EVENT_SYSCALL:
- ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
+ ret = event_kernel_enable_syscall(kchan, "");
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
break;
case LTTNG_EVENT_TRACEPOINT:
/*
kernel_wait_quiescent(kernel_tracer_fd);
break;
}
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_channel *uchan;
- struct ltt_ust_session *usess = session->ust_session;
-
- assert(usess);
-
- /* Get channel from global UST domain */
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- /* Create default channel */
- attr = channel_new_default_attr(domain);
- if (attr == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
- strncpy(attr->name, channel_name, sizeof(attr->name));
-
- ret = cmd_enable_channel(session, domain, attr, wpipe);
- if (ret != LTTNG_OK) {
- free(attr);
- goto error;
- }
- free(attr);
-
- /* Get the newly created channel reference back */
- uchan = trace_ust_find_channel_by_name(
- usess->domain_global.channels, channel_name);
- assert(uchan);
- }
-
- /* At this point, the session and channel exist on the tracer */
-
- switch (event_type) {
- case LTTNG_EVENT_ALL:
- case LTTNG_EVENT_TRACEPOINT:
- ret = event_ust_enable_all_tracepoints(usess, domain, uchan,
- filter);
- if (ret != LTTNG_OK) {
- goto error;
- }
- break;
- default:
- ret = LTTNG_ERR_UST_ENABLE_FAIL;
- goto error;
- }
-
- /* Manage return value */
- if (ret != LTTNG_OK) {
- goto error;
- }
-
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
default:
ret = LTTNG_ERR_UND;
goto error;
goto error;
}
break;
+ case LTTNG_DOMAIN_LOG4J:
+ case LTTNG_DOMAIN_JUL:
+ case LTTNG_DOMAIN_PYTHON:
+ nb_events = agent_list_events(events, domain);
+ if (nb_events < 0) {
+ ret = LTTNG_ERR_UST_LIST_FAIL;
+ goto error;
+ }
+ break;
default:
ret = LTTNG_ERR_UND;
goto error;
return -ret;
}
+ssize_t cmd_list_syscalls(struct lttng_event **events)
+{
+ return syscall_table_list(events);
+}
+
/*
* Command LTTNG_START_TRACE processed by the client thread.
*/
int cmd_start_trace(struct ltt_session *session)
{
int ret;
+ unsigned long nb_chan = 0;
struct ltt_kernel_session *ksession;
struct ltt_ust_session *usess;
ksession = session->kernel_session;
usess = session->ust_session;
- if (session->enabled) {
- /* Already started. */
+ /* Is the session already started? */
+ if (session->active) {
ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
goto error;
}
- session->enabled = 1;
+ /*
+ * Starting a session without channel is useless since after that it's not
+ * possible to enable channel thus inform the client.
+ */
+ if (usess && usess->domain_global.channels) {
+ rcu_read_lock();
+ nb_chan += lttng_ht_get_count(usess->domain_global.channels);
+ rcu_read_unlock();
+ }
+ if (ksession) {
+ nb_chan += ksession->channel_count;
+ }
+ if (!nb_chan) {
+ ret = LTTNG_ERR_NO_CHANNEL;
+ goto error;
+ }
/* Kernel tracing */
if (ksession != NULL) {
/* Flag session that trace should start automatically */
if (usess) {
- usess->start_trace = 1;
+ /*
+ * Even though the start trace might fail, flag this session active so
+ * other application coming in are started by default.
+ */
+ usess->active = 1;
ret = ust_app_start_trace_all(usess);
if (ret < 0) {
}
}
- session->started = 1;
+ /* Flag this after a successful start. */
+ session->has_been_started = 1;
+ session->active = 1;
ret = LTTNG_OK;
ksession = session->kernel_session;
usess = session->ust_session;
- if (!session->enabled) {
+ /* Session is not active. Skip everythong and inform the client. */
+ if (!session->active) {
ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
goto error;
}
- session->enabled = 0;
-
/* Kernel tracer */
- if (ksession) {
+ if (ksession && ksession->active) {
DBG("Stop kernel tracing");
/* Flush metadata if exist */
kernel_wait_quiescent(kernel_tracer_fd);
- ksession->started = 0;
+ ksession->active = 0;
}
- if (usess) {
- usess->start_trace = 0;
+ if (usess && usess->active) {
+ /*
+ * Even though the stop trace might fail, flag this session inactive so
+ * other application coming in are not started by default.
+ */
+ usess->active = 0;
ret = ust_app_stop_trace_all(usess);
if (ret < 0) {
}
}
- session->started = 0;
-
+ /* Flag inactive after a successful stop. */
+ session->active = 0;
ret = LTTNG_OK;
error:
assert(uris);
assert(nb_uri > 0);
- /* Can't enable consumer after session started. */
- if (session->enabled) {
+ /* Can't set consumer URI if the session is active. */
+ if (session->active) {
ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
goto error;
}
case LTTNG_DOMAIN_KERNEL:
/* Code flow error if we don't have a kernel session here. */
assert(ksess);
-
- /* Create consumer output if none exists */
- consumer = ksess->tmp_consumer;
- if (consumer == NULL) {
- consumer = consumer_copy_output(ksess->consumer);
- if (consumer == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
- /* Trash the consumer subdir, we are about to set a new one. */
- memset(consumer->subdir, 0, sizeof(consumer->subdir));
- ksess->tmp_consumer = consumer;
- }
-
+ assert(ksess->consumer);
+ consumer = ksess->consumer;
break;
case LTTNG_DOMAIN_UST:
/* Code flow error if we don't have a kernel session here. */
assert(usess);
-
- /* Create consumer output if none exists */
- consumer = usess->tmp_consumer;
- if (consumer == NULL) {
- consumer = consumer_copy_output(usess->consumer);
- if (consumer == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
- /* Trash the consumer subdir, we are about to set a new one. */
- memset(consumer->subdir, 0, sizeof(consumer->subdir));
- usess->tmp_consumer = consumer;
- }
-
+ assert(usess->consumer);
+ consumer = usess->consumer;
break;
}
for (i = 0; i < nb_uri; i++) {
ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
- if (ret < 0) {
+ if (ret != LTTNG_OK) {
goto error;
}
}
+ /*
+ * Make sure to set the session in output mode after we set URI since a
+ * session can be created without URL (thus flagged in no output mode).
+ */
+ session->output_traces = 1;
+ if (ksess) {
+ ksess->output_traces = 1;
+ } else if (usess) {
+ usess->output_traces = 1;
+ }
+
/* All good! */
ret = LTTNG_OK;
* Command LTTNG_CREATE_SESSION processed by the client thread.
*/
int cmd_create_session_uri(char *name, struct lttng_uri *uris,
- size_t nb_uri, lttng_sock_cred *creds)
+ size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
{
int ret;
- char *path = NULL;
struct ltt_session *session;
assert(name);
+ assert(creds);
/*
* Verify if the session already exist
}
/* Create tracing session in the registry */
- ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
+ ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
LTTNG_SOCK_GET_GID_CRED(creds));
if (ret != LTTNG_OK) {
goto session_error;
session = session_find_by_name(name);
assert(session);
+ session->live_timer = live_timer;
/* Create default consumer output for the session not yet created. */
session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
if (session->consumer == NULL) {
goto consumer_error;
}
+ if (uris) {
+ ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
+ if (ret != LTTNG_OK) {
+ goto consumer_error;
+ }
+ session->output_traces = 1;
+ } else {
+ session->output_traces = 0;
+ DBG2("Session %s created with no output", session->name);
+ }
+
+ session->consumer->enabled = 1;
+
+ return LTTNG_OK;
+
+consumer_error:
+ session_destroy(session);
+session_error:
+find_error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
+ */
+int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
+ size_t nb_uri, lttng_sock_cred *creds)
+{
+ int ret;
+ struct ltt_session *session;
+ struct snapshot_output *new_output = NULL;
+
+ assert(name);
+ assert(creds);
+
/*
- * This means that the lttng_create_session call was called with the _path_
- * argument set to NULL.
+ * Create session in no output mode with URIs set to NULL. The uris we've
+ * received are for a default snapshot output if one.
*/
- if (uris == NULL) {
- /*
- * At this point, we'll skip the consumer URI setup and create a
- * session with a NULL path which will flag the session to NOT spawn a
- * consumer.
- */
- DBG("Create session %s with NO uri, skipping consumer setup", name);
+ ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
+
+ /* Get the newly created session pointer back. This should NEVER fail. */
+ session = session_find_by_name(name);
+ assert(session);
+
+ /* Flag session for snapshot mode. */
+ session->snapshot_mode = 1;
+
+ /* Skip snapshot output creation if no URI is given. */
+ if (nb_uri == 0) {
goto end;
}
- session->start_consumer = 1;
+ new_output = snapshot_output_alloc();
+ if (!new_output) {
+ ret = LTTNG_ERR_NOMEM;
+ goto error_snapshot_alloc;
+ }
- ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
- if (ret != LTTNG_OK) {
- goto consumer_error;
+ ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
+ uris, nb_uri, session->consumer, new_output, &session->snapshot);
+ if (ret < 0) {
+ if (ret == -ENOMEM) {
+ ret = LTTNG_ERR_NOMEM;
+ } else {
+ ret = LTTNG_ERR_INVALID;
+ }
+ goto error_snapshot;
}
- session->consumer->enabled = 1;
+ rcu_read_lock();
+ snapshot_add_output(&session->snapshot, new_output);
+ rcu_read_unlock();
end:
return LTTNG_OK;
-consumer_error:
+error_snapshot:
+ snapshot_output_destroy(new_output);
+error_snapshot_alloc:
session_destroy(session);
-session_error:
-find_error:
+error:
return ret;
}
{
struct lttng_kernel_calibrate kcalibrate;
- kcalibrate.type = calibrate->type;
+ 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;
{
struct lttng_ust_calibrate ucalibrate;
- ucalibrate.type = calibrate->type;
+ 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;
const char *sock_path, struct consumer_data *cdata)
{
int ret, sock;
- struct consumer_socket *socket;
+ struct consumer_socket *socket = NULL;
assert(session);
assert(cdata);
ret = LTTNG_ERR_CONNECT_FAIL;
goto error;
}
+ cdata->cmd_sock = sock;
- socket = consumer_allocate_socket(sock);
+ socket = consumer_allocate_socket(&cdata->cmd_sock);
if (socket == NULL) {
ret = close(sock);
if (ret < 0) {
PERROR("close register consumer");
}
+ cdata->cmd_sock = -1;
ret = LTTNG_ERR_FATAL;
goto error;
}
goto error;
}
- ret = LTTNG_OK;
+ return LTTNG_OK;
error:
+ if (socket) {
+ consumer_destroy_socket(socket);
+ }
return ret;
}
{
int ret, index = 0;
ssize_t nb_dom = 0;
+ struct agent *agt;
+ struct lttng_ht_iter iter;
if (session->kernel_session != NULL) {
DBG3("Listing domains found kernel domain");
if (session->ust_session != NULL) {
DBG3("Listing domains found UST global domain");
nb_dom++;
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
+ agt, node.node) {
+ if (agt->being_used) {
+ nb_dom++;
+ }
+ }
+ rcu_read_unlock();
+ }
+
+ if (!nb_dom) {
+ goto end;
}
*domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
if (session->ust_session != NULL) {
(*domains)[index].type = LTTNG_DOMAIN_UST;
+ (*domains)[index].buf_type = session->ust_session->buffer_type;
index++;
- }
+ rcu_read_lock();
+ cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
+ agt, node.node) {
+ if (agt->being_used) {
+ (*domains)[index].type = agt->domain;
+ (*domains)[index].buf_type = session->ust_session->buffer_type;
+ index++;
+ }
+ }
+ rcu_read_unlock();
+ }
+end:
return nb_dom;
error:
break;
case LTTNG_DOMAIN_UST:
if (session->ust_session != NULL) {
+ rcu_read_lock();
nb_chan = lttng_ht_get_count(
- session->ust_session->domain_global.channels);
+ session->ust_session->domain_global.channels);
+ rcu_read_unlock();
}
DBG3("Number of UST global channels %zd", nb_chan);
- if (nb_chan <= 0) {
+ if (nb_chan < 0) {
ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
+ goto error;
}
break;
default:
- *channels = NULL;
ret = LTTNG_ERR_UND;
goto error;
}
}
list_lttng_channels(domain, session, *channels);
- } else {
- *channels = NULL;
- /* Ret value was set in the domain switch case */
- goto error;
}
return nb_chan;
}
break;
}
+ case LTTNG_DOMAIN_LOG4J:
+ case LTTNG_DOMAIN_JUL:
+ case LTTNG_DOMAIN_PYTHON:
+ if (session->ust_session) {
+ struct lttng_ht_iter iter;
+ struct agent *agt;
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(session->ust_session->agents->ht,
+ &iter.iter, agt, node.node) {
+ nb_event = list_lttng_agent_events(agt, events);
+ }
+ rcu_read_unlock();
+ }
+ break;
default:
ret = LTTNG_ERR_UND;
goto error;
(ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
(usess && usess->consumer->type == CONSUMER_DST_NET)) {
ret = build_network_session_path(sessions[i].path,
- sizeof(session[i].path), session);
+ sizeof(sessions[i].path), session);
} else {
- ret = snprintf(sessions[i].path, sizeof(session[i].path), "%s",
+ ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
session->consumer->dst.trace_path);
}
if (ret < 0) {
strncpy(sessions[i].name, session->name, NAME_MAX);
sessions[i].name[NAME_MAX - 1] = '\0';
- sessions[i].enabled = session->enabled;
+ sessions[i].enabled = session->active;
+ sessions[i].snapshot_mode = session->snapshot_mode;
+ sessions[i].live_timer_interval = session->live_timer;
i++;
}
}
/*
- * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
+ * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
+ * ready for trace analysis (or any kind of reader) or else 1 for pending data.
*/
-int cmd_disable_consumer(int domain, struct ltt_session *session)
+int cmd_data_pending(struct ltt_session *session)
{
int ret;
struct ltt_kernel_session *ksess = session->kernel_session;
struct ltt_ust_session *usess = session->ust_session;
- struct consumer_output *consumer;
assert(session);
- if (session->enabled) {
- /* Can't disable consumer on an already started session */
- ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
+ /* Session MUST be stopped to ask for data availability. */
+ if (session->active) {
+ ret = LTTNG_ERR_SESSION_STARTED;
goto error;
+ } else {
+ /*
+ * If stopped, just make sure we've started before else the above call
+ * will always send that there is data pending.
+ *
+ * The consumer assumes that when the data pending command is received,
+ * the trace has been started before or else no output data is written
+ * by the streams which is a condition for data pending. So, this is
+ * *VERY* important that we don't ask the consumer before a start
+ * trace.
+ */
+ if (!session->has_been_started) {
+ ret = 0;
+ goto error;
+ }
}
- if (!session->start_consumer) {
- ret = LTTNG_ERR_NO_CONSUMER;
- goto error;
+ if (ksess && ksess->consumer) {
+ ret = consumer_is_data_pending(ksess->id, ksess->consumer);
+ if (ret == 1) {
+ /* Data is still being extracted for the kernel. */
+ goto error;
+ }
}
- switch (domain) {
- case 0:
- DBG("Disable tracing session %s consumer", session->name);
- consumer = session->consumer;
- break;
- case LTTNG_DOMAIN_KERNEL:
- /* Code flow error if we don't have a kernel session here. */
- assert(ksess);
+ if (usess && usess->consumer) {
+ ret = consumer_is_data_pending(usess->id, usess->consumer);
+ if (ret == 1) {
+ /* Data is still being extracted for the kernel. */
+ goto error;
+ }
+ }
- DBG("Disabling kernel consumer");
- consumer = ksess->consumer;
+ /* Data is ready to be read by a viewer */
+ ret = 0;
- break;
- case LTTNG_DOMAIN_UST:
- /* Code flow error if we don't have a UST session here. */
- assert(usess);
+error:
+ return ret;
+}
- DBG("Disabling UST consumer");
- consumer = usess->consumer;
+/*
+ * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
+ *
+ * Return LTTNG_OK on success or else a LTTNG_ERR code.
+ */
+int cmd_snapshot_add_output(struct ltt_session *session,
+ struct lttng_snapshot_output *output, uint32_t *id)
+{
+ int ret;
+ struct snapshot_output *new_output;
- break;
- default:
- ret = LTTNG_ERR_UNKNOWN_DOMAIN;
+ assert(session);
+ assert(output);
+
+ 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.
+ */
+ if (session->output_traces) {
+ ret = LTTNG_ERR_EPERM;
goto error;
}
- if (consumer) {
- consumer->enabled = 0;
- /* Success at this point */
- ret = LTTNG_OK;
- } else {
- ret = LTTNG_ERR_NO_CONSUMER;
+ /* Only one output is allowed until we have the "tee" feature. */
+ if (session->snapshot.nb_output == 1) {
+ ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
+ goto error;
+ }
+
+ new_output = snapshot_output_alloc();
+ if (!new_output) {
+ ret = LTTNG_ERR_NOMEM;
+ goto error;
+ }
+
+ ret = snapshot_output_init(output->max_size, output->name,
+ output->ctrl_url, output->data_url, session->consumer, new_output,
+ &session->snapshot);
+ if (ret < 0) {
+ if (ret == -ENOMEM) {
+ ret = LTTNG_ERR_NOMEM;
+ } else {
+ ret = LTTNG_ERR_INVALID;
+ }
+ goto free_error;
+ }
+
+ rcu_read_lock();
+ snapshot_add_output(&session->snapshot, new_output);
+ if (id) {
+ *id = new_output->id;
}
+ rcu_read_unlock();
+ return LTTNG_OK;
+
+free_error:
+ snapshot_output_destroy(new_output);
error:
return ret;
}
/*
- * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
+ * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
+ *
+ * Return LTTNG_OK on success or else a LTTNG_ERR code.
*/
-int cmd_enable_consumer(int domain, struct ltt_session *session)
+int cmd_snapshot_del_output(struct ltt_session *session,
+ struct lttng_snapshot_output *output)
{
int ret;
- struct ltt_kernel_session *ksess = session->kernel_session;
- struct ltt_ust_session *usess = session->ust_session;
- struct consumer_output *consumer = NULL;
+ struct snapshot_output *sout = NULL;
assert(session);
+ assert(output);
- /* Can't enable consumer after session started. */
- if (session->enabled) {
- ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
+ rcu_read_lock();
+
+ /*
+ * Permission denied to create an output if the session is not
+ * set in no output mode.
+ */
+ if (session->output_traces) {
+ ret = LTTNG_ERR_EPERM;
goto error;
}
- switch (domain) {
- case 0:
- assert(session->consumer);
- consumer = session->consumer;
- break;
- case LTTNG_DOMAIN_KERNEL:
- /* Code flow error if we don't have a kernel session here. */
- assert(ksess);
+ if (output->id) {
+ DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
+ session->name);
+ sout = snapshot_find_output_by_id(output->id, &session->snapshot);
+ } else if (*output->name != '\0') {
+ DBG("Cmd snapshot del output name %s for session %s", output->name,
+ session->name);
+ sout = snapshot_find_output_by_name(output->name, &session->snapshot);
+ }
+ if (!sout) {
+ ret = LTTNG_ERR_INVALID;
+ goto error;
+ }
- /*
- * Check if we have already sent fds to the consumer. In that case,
- * the enable-consumer command can't be used because a start trace
- * had previously occured.
- */
- if (ksess->consumer_fds_sent) {
- ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
- goto error;
- }
+ snapshot_delete_output(&session->snapshot, sout);
+ snapshot_output_destroy(sout);
+ ret = LTTNG_OK;
- consumer = ksess->tmp_consumer;
- if (consumer == NULL) {
- ret = LTTNG_OK;
- /* No temp. consumer output exists. Using the current one. */
- DBG3("No temporary consumer. Using default");
- consumer = ksess->consumer;
- goto error;
- }
+error:
+ rcu_read_unlock();
+ return ret;
+}
+
+/*
+ * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
+ *
+ * If no output is available, outputs is untouched and 0 is returned.
+ *
+ * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
+ */
+ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
+ struct lttng_snapshot_output **outputs)
+{
+ int ret, idx = 0;
+ struct lttng_snapshot_output *list = NULL;
+ struct lttng_ht_iter iter;
+ struct snapshot_output *output;
+
+ assert(session);
+ assert(outputs);
+
+ DBG("Cmd snapshot list outputs for session %s", session->name);
+
+ /*
+ * Permission denied to create an output if the session is not
+ * set in no output mode.
+ */
+ if (session->output_traces) {
+ ret = -LTTNG_ERR_EPERM;
+ goto error;
+ }
+
+ if (session->snapshot.nb_output == 0) {
+ ret = 0;
+ goto error;
+ }
- switch (consumer->type) {
- case CONSUMER_DST_LOCAL:
- DBG2("Consumer output is local. Creating directory(ies)");
+ list = zmalloc(session->snapshot.nb_output * sizeof(*list));
+ if (!list) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto error;
+ }
- /* Create directory(ies) */
- ret = run_as_mkdir_recursive(consumer->dst.trace_path,
- S_IRWXU | S_IRWXG, session->uid, session->gid);
+ /* Copy list from session to the new list object. */
+ rcu_read_lock();
+ cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
+ output, node.node) {
+ assert(output->consumer);
+ list[idx].id = output->id;
+ list[idx].max_size = output->max_size;
+ strncpy(list[idx].name, output->name, sizeof(list[idx].name));
+ if (output->consumer->type == CONSUMER_DST_LOCAL) {
+ strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
+ sizeof(list[idx].ctrl_url));
+ } else {
+ /* Control URI. */
+ ret = uri_to_str_url(&output->consumer->dst.net.control,
+ list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
if (ret < 0) {
- if (ret != -EEXIST) {
- ERR("Trace directory creation error");
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
- }
- break;
- case CONSUMER_DST_NET:
- DBG2("Consumer output is network. Validating URIs");
- /* Validate if we have both control and data path set. */
- if (!consumer->dst.net.control_isset) {
- ret = LTTNG_ERR_URL_CTRL_MISS;
+ ret = -LTTNG_ERR_NOMEM;
goto error;
}
- if (!consumer->dst.net.data_isset) {
- ret = LTTNG_ERR_URL_DATA_MISS;
+ /* Data URI. */
+ ret = uri_to_str_url(&output->consumer->dst.net.data,
+ list[idx].data_url, sizeof(list[idx].data_url));
+ if (ret < 0) {
+ ret = -LTTNG_ERR_NOMEM;
goto error;
}
+ }
+ idx++;
+ }
- /* Check established network session state */
- if (session->net_handle == 0) {
- ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
- ERR("Session network handle is not set on enable-consumer");
- goto error;
- }
+ *outputs = list;
+ list = NULL;
+ ret = session->snapshot.nb_output;
+error:
+ free(list);
+ rcu_read_unlock();
+ return ret;
+}
- break;
- }
+/*
+ * 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.
+ */
+static int set_relayd_for_snapshot(struct consumer_output *consumer,
+ struct snapshot_output *snap_output, struct ltt_session *session)
+{
+ int ret = LTTNG_OK;
+ struct lttng_ht_iter iter;
+ struct consumer_socket *socket;
- /*
- * @session-lock
- * This is race free for now since the session lock is acquired before
- * ending up in this function. No other threads can access this kernel
- * session without this lock hence freeing the consumer output object
- * is valid.
- */
- rcu_read_lock();
- /* Destroy current consumer. We are about to replace it */
- consumer_destroy_output(ksess->consumer);
- rcu_read_unlock();
- ksess->consumer = consumer;
- ksess->tmp_consumer = NULL;
+ assert(consumer);
+ assert(snap_output);
+ assert(session);
- break;
- case LTTNG_DOMAIN_UST:
- /* Code flow error if we don't have a UST session here. */
- assert(usess);
+ DBG2("Set relayd object from snapshot output");
- /*
- * Check if we have already sent fds to the consumer. In that case,
- * the enable-consumer command can't be used because a start trace
- * had previously occured.
- */
- if (usess->start_trace) {
- ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
- goto error;
- }
+ /* Ignore if snapshot consumer output is not network. */
+ if (snap_output->consumer->type != CONSUMER_DST_NET) {
+ goto error;
+ }
- consumer = usess->tmp_consumer;
- if (consumer == NULL) {
- ret = LTTNG_OK;
- /* No temp. consumer output exists. Using the current one. */
- DBG3("No temporary consumer. Using default");
- consumer = usess->consumer;
+ /*
+ * For each consumer socket, create and send the relayd object of the
+ * snapshot output.
+ */
+ 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,
+ snap_output->consumer, socket,
+ session->name, session->hostname,
+ session->live_timer);
+ if (ret != LTTNG_OK) {
+ rcu_read_unlock();
goto error;
}
+ }
+ rcu_read_unlock();
- switch (consumer->type) {
- case CONSUMER_DST_LOCAL:
- DBG2("Consumer output is local. Creating directory(ies)");
+error:
+ return ret;
+}
- /* Create directory(ies) */
- ret = run_as_mkdir_recursive(consumer->dst.trace_path,
- S_IRWXU | S_IRWXG, session->uid, session->gid);
- if (ret < 0) {
- if (ret != -EEXIST) {
- ERR("Trace directory creation error");
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
- }
- break;
- case CONSUMER_DST_NET:
- DBG2("Consumer output is network. Validating URIs");
- /* Validate if we have both control and data path set. */
- if (!consumer->dst.net.control_isset) {
- ret = LTTNG_ERR_URL_CTRL_MISS;
- goto error;
- }
+/*
+ * Record a kernel snapshot.
+ *
+ * Return LTTNG_OK on success or a LTTNG_ERR code.
+ */
+static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
+ struct snapshot_output *output, struct ltt_session *session,
+ int wait, uint64_t max_stream_size)
+{
+ int ret;
- if (!consumer->dst.net.data_isset) {
- ret = LTTNG_ERR_URL_DATA_MISS;
- goto error;
- }
+ assert(ksess);
+ assert(output);
+ assert(session);
- /* Check established network session state */
- if (session->net_handle == 0) {
- ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
- DBG2("Session network handle is not set on enable-consumer");
- goto error;
- }
+ /* Get the datetime for the snapshot output directory. */
+ ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
+ sizeof(output->datetime));
+ if (!ret) {
+ ret = LTTNG_ERR_INVALID;
+ goto error;
+ }
- if (consumer->net_seq_index == -1) {
- ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
- DBG2("Network index is not set on the consumer");
- goto error;
- }
+ /*
+ * 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;
+ goto error;
+ }
+
+ ret = set_relayd_for_snapshot(ksess->consumer, output, session);
+ if (ret != LTTNG_OK) {
+ goto error_snapshot;
+ }
+
+ ret = kernel_snapshot_record(ksess, output, wait, max_stream_size);
+ if (ret != 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;
+}
+
+/*
+ * Record a UST snapshot.
+ *
+ * Return 0 on success or a LTTNG_ERR error code.
+ */
+static int record_ust_snapshot(struct ltt_ust_session *usess,
+ struct snapshot_output *output, struct ltt_session *session,
+ int wait, uint64_t max_stream_size)
+{
+ int ret;
+
+ assert(usess);
+ assert(output);
+ assert(session);
+
+ /* Get the datetime for the snapshot output directory. */
+ ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
+ sizeof(output->datetime));
+ if (!ret) {
+ ret = LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ /*
+ * Copy UST session sockets so we can communicate with the right
+ * consumer for the snapshot record command.
+ */
+ ret = consumer_copy_sockets(output->consumer, usess->consumer);
+ if (ret < 0) {
+ ret = LTTNG_ERR_NOMEM;
+ goto error;
+ }
+
+ ret = set_relayd_for_snapshot(usess->consumer, output, session);
+ if (ret != LTTNG_OK) {
+ goto error_snapshot;
+ }
+ ret = ust_app_snapshot_record(usess, output, wait, max_stream_size);
+ if (ret < 0) {
+ switch (-ret) {
+ case EINVAL:
+ ret = LTTNG_ERR_INVALID;
+ break;
+ case ENODATA:
+ ret = LTTNG_ERR_SNAPSHOT_NODATA;
+ break;
+ default:
+ ret = LTTNG_ERR_SNAPSHOT_FAIL;
break;
}
+ 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 the biggest subbuffer size of all channels in the given session.
+ */
+static uint64_t get_session_max_subbuf_size(struct ltt_session *session)
+{
+ uint64_t max_size = 0;
+
+ assert(session);
+
+ if (session->kernel_session) {
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_session *ksess = session->kernel_session;
/*
- * @session-lock
- * This is race free for now since the session lock is acquired before
- * ending up in this function. No other threads can access this kernel
- * session without this lock hence freeing the consumer output object
- * is valid.
+ * For each channel, add to the max size the size of each subbuffer
+ * multiplied by their sized.
*/
+ cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
+ if (chan->channel->attr.subbuf_size > max_size) {
+ max_size = chan->channel->attr.subbuf_size;
+ }
+ }
+ }
+
+ if (session->ust_session) {
+ struct lttng_ht_iter iter;
+ struct ltt_ust_channel *uchan;
+ struct ltt_ust_session *usess = session->ust_session;
+
rcu_read_lock();
- /* Destroy current consumer. We are about to replace it */
- consumer_destroy_output(usess->consumer);
+ cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
+ uchan, node.node) {
+ if (uchan->attr.subbuf_size > max_size) {
+ max_size = uchan->attr.subbuf_size;
+ }
+ }
rcu_read_unlock();
- usess->consumer = consumer;
- usess->tmp_consumer = NULL;
+ }
- break;
+ return max_size;
+}
+
+/*
+ * Returns the total number of streams for a session or a negative value
+ * on error.
+ */
+static unsigned int get_session_nb_streams(struct ltt_session *session)
+{
+ unsigned int total_streams = 0;
+
+ if (session->kernel_session) {
+ struct ltt_kernel_session *ksess = session->kernel_session;
+
+ total_streams += ksess->stream_count_global;
}
- session->start_consumer = 1;
+ if (session->ust_session) {
+ struct ltt_ust_session *usess = session->ust_session;
- /* Enable it */
- if (consumer) {
- consumer->enabled = 1;
- /* Success at this point */
- ret = LTTNG_OK;
- } else {
- /* Should not really happend... */
- ret = LTTNG_ERR_NO_CONSUMER;
+ total_streams += ust_app_get_nb_stream(usess);
}
-error:
- return ret;
+ return total_streams;
}
/*
- * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
- * ready for trace analysis (or anykind of reader) or else 1 for pending data.
+ * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
+ *
+ * The wait parameter is ignored so this call always wait for the snapshot to
+ * complete before returning.
+ *
+ * Return LTTNG_OK on success or else a LTTNG_ERR code.
*/
-int cmd_data_pending(struct ltt_session *session)
+int cmd_snapshot_record(struct ltt_session *session,
+ struct lttng_snapshot_output *output, int wait)
{
- int ret;
- struct ltt_kernel_session *ksess = session->kernel_session;
- struct ltt_ust_session *usess = session->ust_session;
+ int ret = LTTNG_OK;
+ unsigned int use_tmp_output = 0;
+ struct snapshot_output tmp_output;
+ unsigned int nb_streams, snapshot_success = 0;
+ uint64_t session_max_size = 0, max_stream_size = 0;
assert(session);
+ assert(output);
- /* Session MUST be stopped to ask for data availability. */
- if (session->enabled) {
- ret = LTTNG_ERR_SESSION_STARTED;
+ DBG("Cmd snapshot record for session %s", session->name);
+
+ /*
+ * Permission denied to create an output if the session is not
+ * set in no output mode.
+ */
+ if (session->output_traces) {
+ ret = LTTNG_ERR_EPERM;
goto error;
}
- if (ksess && ksess->consumer) {
- ret = consumer_is_data_pending(ksess->id, ksess->consumer);
- if (ret == 1) {
- /* Data is still being extracted for the kernel. */
+ /* The session needs to be started at least once. */
+ if (!session->has_been_started) {
+ ret = LTTNG_ERR_START_SESSION_ONCE;
+ goto error;
+ }
+
+ /* Use temporary output for the session. */
+ if (*output->ctrl_url != '\0') {
+ ret = snapshot_output_init(output->max_size, output->name,
+ output->ctrl_url, output->data_url, session->consumer,
+ &tmp_output, NULL);
+ if (ret < 0) {
+ if (ret == -ENOMEM) {
+ ret = LTTNG_ERR_NOMEM;
+ } else {
+ ret = LTTNG_ERR_INVALID;
+ }
goto error;
}
+ /* Use the global session count for the temporary snapshot. */
+ tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
+ use_tmp_output = 1;
}
- if (usess && usess->consumer) {
- ret = consumer_is_data_pending(usess->id, usess->consumer);
- if (ret == 1) {
- /* Data is still being extracted for the kernel. */
- goto error;
+ /*
+ * Get the session maximum size for a snapshot meaning it will compute the
+ * size of all streams from all domain.
+ */
+ max_stream_size = get_session_max_subbuf_size(session);
+
+ nb_streams = get_session_nb_streams(session);
+ if (nb_streams) {
+ /*
+ * The maximum size of the snapshot is the number of streams multiplied
+ * by the biggest subbuf size of all channels in a session which is the
+ * maximum stream size available for each stream. The session max size
+ * is now checked against the snapshot max size value given by the user
+ * and if lower, an error is returned.
+ */
+ session_max_size = max_stream_size * nb_streams;
+ }
+
+ DBG3("Snapshot max size is %" PRIu64 " for max stream size of %" PRIu64,
+ session_max_size, max_stream_size);
+
+ /*
+ * If we use a temporary output, check right away if the max size fits else
+ * for each output the max size will be checked.
+ */
+ if (use_tmp_output &&
+ (tmp_output.max_size != 0 &&
+ tmp_output.max_size < session_max_size)) {
+ ret = LTTNG_ERR_MAX_SIZE_INVALID;
+ goto error;
+ }
+
+ if (session->kernel_session) {
+ struct ltt_kernel_session *ksess = session->kernel_session;
+
+ if (use_tmp_output) {
+ ret = record_kernel_snapshot(ksess, &tmp_output, session,
+ wait, max_stream_size);
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
+ snapshot_success = 1;
+ } else {
+ struct snapshot_output *sout;
+ struct lttng_ht_iter iter;
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
+ &iter.iter, sout, node.node) {
+ /*
+ * Make a local copy of the output and assign the possible
+ * temporary value given by the caller.
+ */
+ memset(&tmp_output, 0, sizeof(tmp_output));
+ memcpy(&tmp_output, sout, sizeof(tmp_output));
+
+ /* Use temporary max size. */
+ if (output->max_size != (uint64_t) -1ULL) {
+ tmp_output.max_size = output->max_size;
+ }
+
+ if (tmp_output.max_size != 0 &&
+ tmp_output.max_size < session_max_size) {
+ rcu_read_unlock();
+ ret = LTTNG_ERR_MAX_SIZE_INVALID;
+ goto error;
+ }
+
+ /* Use temporary name. */
+ if (*output->name != '\0') {
+ strncpy(tmp_output.name, output->name,
+ sizeof(tmp_output.name));
+ }
+
+ tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
+
+ ret = record_kernel_snapshot(ksess, &tmp_output,
+ session, wait, max_stream_size);
+ if (ret != LTTNG_OK) {
+ rcu_read_unlock();
+ goto error;
+ }
+ snapshot_success = 1;
+ }
+ rcu_read_unlock();
}
}
- /* Data is ready to be read by a viewer */
- ret = 0;
+ if (session->ust_session) {
+ struct ltt_ust_session *usess = session->ust_session;
+
+ if (use_tmp_output) {
+ ret = record_ust_snapshot(usess, &tmp_output, session,
+ wait, max_stream_size);
+ if (ret != LTTNG_OK) {
+ goto error;
+ }
+ snapshot_success = 1;
+ } else {
+ struct snapshot_output *sout;
+ struct lttng_ht_iter iter;
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
+ &iter.iter, sout, node.node) {
+ /*
+ * Make a local copy of the output and assign the possible
+ * temporary value given by the caller.
+ */
+ memset(&tmp_output, 0, sizeof(tmp_output));
+ memcpy(&tmp_output, sout, sizeof(tmp_output));
+
+ /* Use temporary max size. */
+ if (output->max_size != (uint64_t) -1ULL) {
+ tmp_output.max_size = output->max_size;
+ }
+
+ if (tmp_output.max_size != 0 &&
+ tmp_output.max_size < session_max_size) {
+ rcu_read_unlock();
+ ret = LTTNG_ERR_MAX_SIZE_INVALID;
+ goto error;
+ }
+
+ /* Use temporary name. */
+ if (*output->name != '\0') {
+ strncpy(tmp_output.name, output->name,
+ sizeof(tmp_output.name));
+ }
+
+ tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
+
+ ret = record_ust_snapshot(usess, &tmp_output, session,
+ wait, max_stream_size);
+ if (ret != LTTNG_OK) {
+ rcu_read_unlock();
+ goto error;
+ }
+ snapshot_success = 1;
+ }
+ rcu_read_unlock();
+ }
+ }
+
+ if (snapshot_success) {
+ session->snapshot.nb_snapshot++;
+ } else {
+ ret = LTTNG_ERR_SNAPSHOT_FAIL;
+ }
error:
return ret;
void cmd_init(void)
{
/*
- * Set network sequence index to 1 for streams to match a relayd socket on
- * the consumer side.
+ * Set network sequence index to 1 for streams to match a relayd
+ * socket on the consumer side.
*/
- uatomic_set(&relayd_net_seq_idx, 1);
+ pthread_mutex_lock(&relayd_net_seq_idx_lock);
+ relayd_net_seq_idx = 1;
+ pthread_mutex_unlock(&relayd_net_seq_idx_lock);
DBG("Command subsystem initialized");
}
projects / lttng-tools.git / blobdiff