#define _GNU_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"
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. */
case LTTNG_DST_IPV6:
DBG2("Setting network URI to consumer");
- consumer->type = CONSUMER_DST_NET;
-
- if ((uri->stype == LTTNG_STREAM_CONTROL &&
+ 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;
+ 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) {
/*
break;
}
+ ret = LTTNG_OK;
+
error:
return ret;
}
* 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,
- struct ltt_session *session)
+static int create_connect_relayd(struct lttng_uri *uri,
+ struct lttcomm_relayd_sock **relayd_sock)
{
int ret;
- struct lttcomm_sock *sock;
- uint32_t minor;
+ struct lttcomm_relayd_sock *rsock;
- /* Create socket object from URI */
- sock = lttcomm_alloc_sock_from_uri(uri);
- if (sock == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
-
- 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, &minor);
+ ret = relayd_version_check(rsock);
if (ret < 0) {
ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
goto close_sock;
}
- session->major = RELAYD_VERSION_COMM_MAJOR;
- session->minor = minor;
} else if (uri->stype == LTTNG_STREAM_DATA) {
DBG3("Creating relayd data socket from URI");
} else {
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)
{
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, session);
+ 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 == (uint64_t) -1ULL) {
}
/* 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);
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)
{
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,
+ ret = send_consumer_relayd_socket(domain, session_id,
&consumer->dst.net.control, consumer, sock);
if (ret != LTTNG_OK) {
goto error;
/* Sending data relayd socket. */
if (!sock->data_sock_sent) {
- ret = send_consumer_relayd_socket(domain, session,
+ ret = send_consumer_relayd_socket(domain, session_id,
&consumer->dst.net.data, consumer, sock);
if (ret != LTTNG_OK) {
goto error;
assert(socket->fd >= 0);
pthread_mutex_lock(socket->lock);
- ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session,
+ ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
usess->consumer, socket);
pthread_mutex_unlock(socket->lock);
if (ret != LTTNG_OK) {
goto error;
}
+ /* Session is now ready for network streaming. */
+ session->net_handle = 1;
}
}
assert(socket->fd >= 0);
pthread_mutex_lock(socket->lock);
- ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session,
+ ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
ksess->consumer, socket);
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;
}
rcu_read_lock();
+ /*
+ * 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->started) {
+ ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
+ goto error;
+ }
+
switch (domain->type) {
case LTTNG_DOMAIN_KERNEL:
{
}
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:
} else {
ret = channel_ust_enable(usess, 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 = LTTNG_OK;
- usess->start_trace = 1;
- }
break;
}
default:
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 */
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;
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;
}
kchan = trace_kernel_get_channel_by_name(channel_name,
session->kernel_session);
if (kchan == NULL) {
- attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
+ attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
+ LTTNG_BUFFER_GLOBAL);
if (attr == NULL) {
ret = LTTNG_ERR_FATAL;
goto error;
channel_name);
if (uchan == NULL) {
/* Create default channel */
- attr = channel_new_default_attr(LTTNG_DOMAIN_UST);
+ attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
+ usess->buffer_type);
if (attr == NULL) {
ret = LTTNG_ERR_FATAL;
goto error;
session->kernel_session);
if (kchan == NULL) {
/* Create default channel */
- attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
+ attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
+ LTTNG_BUFFER_GLOBAL);
if (attr == NULL) {
ret = LTTNG_ERR_FATAL;
goto error;
channel_name);
if (uchan == NULL) {
/* Create default channel */
- attr = channel_new_default_attr(LTTNG_DOMAIN_UST);
+ attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
+ usess->buffer_type);
if (attr == NULL) {
ret = LTTNG_ERR_FATAL;
goto error;
session->enabled = 0;
/* Kernel tracer */
- if (ksession) {
+ if (ksession && ksession->started) {
DBG("Stop kernel tracing");
/* Flush metadata if exist */
ksession->started = 0;
}
- if (usess) {
+ if (usess && usess->start_trace) {
usess->start_trace = 0;
ret = ust_app_stop_trace_all(usess);
}
}
- session->started = 0;
-
ret = LTTNG_OK;
error:
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;
}
}
size_t nb_uri, lttng_sock_cred *creds)
{
int ret;
- char *path = NULL;
struct ltt_session *session;
assert(name);
-
- /* No URIs is not possible. */
- if (uris == NULL) {
- ret = LTTNG_ERR_SESSION_FAIL;
- goto session_error;
- }
+ 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;
goto consumer_error;
}
- ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
- if (ret != LTTNG_OK) {
- 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 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);
+
+ /*
+ * Create session in no output mode with URIs set to NULL. The uris we've
+ * received are for a default snapshot output if one.
+ */
+ ret = cmd_create_session_uri(name, NULL, 0, creds);
+ 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;
+ }
+
+ new_output = snapshot_output_alloc();
+ if (!new_output) {
+ ret = LTTNG_ERR_NOMEM;
+ goto error_snapshot_alloc;
+ }
+
+ 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;
+ }
+
+ rcu_read_lock();
+ snapshot_add_output(&session->snapshot, new_output);
+ rcu_read_unlock();
+
+end:
+ return LTTNG_OK;
+
+error_snapshot:
+ snapshot_output_destroy(new_output);
+error_snapshot_alloc:
+ session_destroy(session);
+error:
+ return ret;
+}
+
/*
* Command LTTNG_DESTROY_SESSION processed by the client thread.
*/
const char *sock_path, struct consumer_data *cdata)
{
int ret, sock;
- struct consumer_socket *socket;
+ struct consumer_socket *socket = NULL;
assert(session);
assert(cdata);
goto error;
}
- ret = LTTNG_OK;
+ return LTTNG_OK;
error:
+ if (socket) {
+ consumer_destroy_socket(socket);
+ }
return ret;
}
if (session->ust_session != NULL) {
(*domains)[index].type = LTTNG_DOMAIN_UST;
+ (*domains)[index].buf_type = session->ust_session->buffer_type;
index++;
}
(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].snapshot_mode = session->snapshot_mode;
i++;
}
}
/*
* 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.
+ * ready for trace analysis (or any kind of reader) or else 1 for pending data.
*/
int cmd_data_pending(struct ltt_session *session)
{
return ret;
}
+/*
+ * 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;
+
+ 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;
+ }
+
+ /* 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_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
+ *
+ * Return LTTNG_OK on success or else a LTTNG_ERR code.
+ */
+int cmd_snapshot_del_output(struct ltt_session *session,
+ struct lttng_snapshot_output *output)
+{
+ int ret;
+ struct snapshot_output *sout = NULL;
+
+ assert(session);
+ assert(output);
+
+ 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;
+ }
+
+ 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;
+ }
+
+ snapshot_delete_output(&session->snapshot, sout);
+ snapshot_output_destroy(sout);
+ ret = LTTNG_OK;
+
+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;
+ 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;
+ }
+
+ list = zmalloc(session->snapshot.nb_output * sizeof(*list));
+ if (!list) {
+ ret = LTTNG_ERR_NOMEM;
+ goto error;
+ }
+
+ /* Copy list from session to the new list object. */
+ 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) {
+ ret = LTTNG_ERR_NOMEM;
+ goto free_error;
+ }
+
+ /* 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 free_error;
+ }
+ }
+ idx++;
+ }
+
+ *outputs = list;
+ return session->snapshot.nb_output;
+
+free_error:
+ free(list);
+error:
+ 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.
+ */
+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;
+
+ assert(consumer);
+ assert(snap_output);
+ assert(session);
+
+ DBG2("Set relayd object from snapshot output");
+
+ /* Ignore if snapshot consumer output is not network. */
+ if (snap_output->consumer->type != CONSUMER_DST_NET) {
+ goto error;
+ }
+
+ /*
+ * 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);
+ if (ret != LTTNG_OK) {
+ rcu_read_unlock();
+ goto error;
+ }
+ }
+ rcu_read_unlock();
+
+error:
+ return ret;
+}
+
+/*
+ * Record a kernel snapshot.
+ *
+ * Return 0 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, int nb_streams)
+{
+ int ret;
+
+ assert(ksess);
+ 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 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, nb_streams);
+ if (ret < 0) {
+ ret = LTTNG_ERR_SNAPSHOT_FAIL;
+ if (ret == -EINVAL) {
+ ret = LTTNG_ERR_INVALID;
+ }
+ 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, int nb_streams)
+{
+ 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, nb_streams);
+ if (ret < 0) {
+ ret = LTTNG_ERR_SNAPSHOT_FAIL;
+ if (ret == -EINVAL) {
+ ret = LTTNG_ERR_INVALID;
+ }
+ 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;
+}
+
+/*
+ * Returns the total number of streams for a session or a negative value
+ * on error.
+ */
+static unsigned int get_total_nb_stream(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;
+ }
+
+ if (session->ust_session) {
+ struct ltt_ust_session *usess = session->ust_session;
+
+ total_streams += ust_app_get_nb_stream(usess);
+ }
+
+ return total_streams;
+}
+
+/*
+ * 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_snapshot_record(struct ltt_session *session,
+ struct lttng_snapshot_output *output, int wait)
+{
+ int ret = LTTNG_OK;
+ unsigned int use_tmp_output = 0;
+ struct snapshot_output tmp_output;
+ unsigned int nb_streams, snapshot_success = 0;
+
+ assert(session);
+
+ 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;
+ }
+
+ /* The session needs to be started at least once. */
+ if (!session->started) {
+ ret = LTTNG_ERR_START_SESSION_ONCE;
+ goto error;
+ }
+
+ /* Use temporary output for the session. */
+ if (output && *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;
+ }
+
+ /*
+ * Get the total number of stream of that session which is used by the
+ * maximum size of the snapshot feature.
+ */
+ nb_streams = get_total_nb_stream(session);
+
+ 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, nb_streams);
+ 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;
+ }
+
+ /* 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, nb_streams);
+ if (ret != LTTNG_OK) {
+ rcu_read_unlock();
+ goto error;
+ }
+ snapshot_success = 1;
+ }
+ rcu_read_unlock();
+ }
+ }
+
+ 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, nb_streams);
+ 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;
+ }
+
+ /* 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, nb_streams);
+ if (ret != LTTNG_OK) {
+ rcu_read_unlock();
+ goto error;
+ }
+ snapshot_success = 1;
+ }
+ rcu_read_unlock();
+ }
+ }
+
+ if (snapshot_success) {
+ session->snapshot.nb_snapshot++;
+ }
+
+error:
+ return ret;
+}
+
/*
* Init command subsystem.
*/
projects / lttng-tools.git / blobdiff