+ * Ask the session daemon for all available events of a session channel.
+ * Sets the contents of the events array.
+ * Returns the number of lttng_event entries in events;
+ * on error, returns a negative value.
+ */
+int lttng_list_events(struct lttng_handle *handle,
+ const char *channel_name, struct lttng_event **events)
+{
+ int ret;
+ struct lttcomm_session_msg lsm = {};
+ const struct lttcomm_event_command_header *cmd_header = NULL;
+ uint32_t nb_events, i;
+ const void *comm_ext_at;
+ struct lttng_dynamic_buffer listing;
+ size_t storage_req;
+ struct lttng_payload payload;
+ struct lttng_payload payload_copy;
+ struct lttng_payload_view lsm_view =
+ lttng_payload_view_init_from_buffer(
+ (const char *) &lsm, 0, sizeof(lsm));
+ struct lttng_buffer_view cmd_header_view;
+ struct lttng_buffer_view cmd_payload_view;
+ struct lttng_buffer_view flat_events_view;
+ struct lttng_buffer_view ext_view;
+
+ /* Safety check. An handle and channel name are mandatory */
+ if (handle == NULL || channel_name == NULL) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ lttng_payload_init(&payload);
+ lttng_payload_init(&payload_copy);
+
+ lsm.cmd_type = LTTNG_LIST_EVENTS;
+ ret = lttng_strncpy(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = lttng_strncpy(lsm.u.list.channel_name, channel_name,
+ sizeof(lsm.u.list.channel_name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
+
+ ret = lttng_ctl_ask_sessiond_payload(&lsm_view, &payload);
+ if (ret < 0) {
+ goto end;
+ }
+
+ /*
+ * A copy of the payload is performed since it will be
+ * consumed twice. Consuming the same payload twice is invalid since
+ * it will cause any received file descriptor to become "shared"
+ * between different instances of the resulting objects.
+ */
+ ret = lttng_payload_copy(&payload, &payload_copy);
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ cmd_header_view = lttng_buffer_view_from_dynamic_buffer(
+ &payload.buffer, 0, sizeof(*cmd_header));
+ if (!lttng_buffer_view_is_valid(&cmd_header_view)) {
+ ret = -LTTNG_ERR_INVALID_PROTOCOL;
+ goto end;
+ }
+
+ cmd_header = (typeof(cmd_header)) cmd_header_view.data;
+
+ /* Set number of events and free command header */
+ nb_events = cmd_header->nb_events;
+ if (nb_events > INT_MAX) {
+ ret = -LTTNG_ERR_OVERFLOW;
+ goto end;
+ }
+
+ cmd_payload_view = lttng_buffer_view_from_dynamic_buffer(
+ &payload.buffer, sizeof(*cmd_header), -1);
+
+ /*
+ * The buffer that is returned must contain a "flat" version of
+ * the events that are returned. In other words, all pointers
+ * within an lttng_event must point to a location within the returned
+ * buffer so that the user may free everything by simply calling free()
+ * on the returned buffer. This is needed in order to maintain API
+ * compatibility.
+ *
+ * A first pass is performed to compute the size of the buffer that
+ * must be allocated. A second pass is then performed to setup
+ * the returned events so that their members always point within the
+ * buffer.
+ *
+ * The layout of the returned buffer is as follows:
+ * - struct lttng_event[nb_events],
+ * - nb_events times the following:
+ * - struct lttng_event_extended,
+ * - flattened version of userspace_probe_location
+ * - filter_expression
+ * - exclusions
+ * - padding to align to 64-bits
+ */
+ ext_view = lttng_buffer_view_from_view(&cmd_payload_view,
+ nb_events * sizeof(struct lttng_event), -1);
+ comm_ext_at = ext_view.data;
+ storage_req = nb_events * sizeof(struct lttng_event);
+ {
+ struct lttng_payload_view payload_view =
+ lttng_payload_view_from_payload(&payload, 0, -1);
+
+ for (i = 0; i < nb_events; i++) {
+ const struct lttcomm_event_extended_header *ext_comm =
+ (struct lttcomm_event_extended_header *)
+ comm_ext_at;
+ int probe_storage_req = 0;
+
+ comm_ext_at += sizeof(*ext_comm);
+ comm_ext_at += ext_comm->filter_len;
+ comm_ext_at += ext_comm->nb_exclusions *
+ LTTNG_SYMBOL_NAME_LEN;
+
+ if (ext_comm->userspace_probe_location_len) {
+ struct lttng_userspace_probe_location
+ *probe_location = NULL;
+ struct lttng_payload_view probe_location_view = lttng_payload_view_from_view(
+ &payload_view,
+ (const char *) comm_ext_at -
+ payload_view.buffer.data,
+ ext_comm->userspace_probe_location_len);
+
+ if (!lttng_payload_view_is_valid(&probe_location_view)) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto end;
+ }
+
+ /*
+ * Create a temporary userspace probe location
+ * to determine the size needed by a "flattened"
+ * version of that same probe location.
+ */
+ ret = lttng_userspace_probe_location_create_from_payload(
+ &probe_location_view,
+ &probe_location);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto end;
+ }
+
+ ret = lttng_userspace_probe_location_flatten(
+ probe_location, NULL);
+ lttng_userspace_probe_location_destroy(
+ probe_location);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto end;
+ }
+
+ probe_storage_req = ret;
+ comm_ext_at += ext_comm->userspace_probe_location_len;
+ }
+
+ storage_req += sizeof(struct lttng_event_extended);
+ storage_req += ext_comm->filter_len;
+ storage_req += ext_comm->nb_exclusions *
+ LTTNG_SYMBOL_NAME_LEN;
+ /* Padding to ensure the flat probe is aligned. */
+ storage_req = ALIGN_TO(storage_req, sizeof(uint64_t));
+ storage_req += probe_storage_req;
+ }
+ }
+
+ lttng_dynamic_buffer_init(&listing);
+ /*
+ * We must ensure that "listing" is never resized so as to preserve
+ * the validity of the flattened objects.
+ */
+ ret = lttng_dynamic_buffer_set_capacity(&listing, storage_req);
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ cmd_payload_view = lttng_buffer_view_from_dynamic_buffer(
+ &payload_copy.buffer, sizeof(*cmd_header), -1);
+ flat_events_view = lttng_buffer_view_from_view(&cmd_payload_view, 0,
+ nb_events * sizeof(struct lttng_event));
+ ret = lttng_dynamic_buffer_append_view(&listing, &flat_events_view);
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+
+ ext_view = lttng_buffer_view_from_view(&cmd_payload_view,
+ nb_events * sizeof(struct lttng_event), -1);
+ comm_ext_at = ext_view.data;
+
+ {
+ struct lttng_payload_view payload_copy_view =
+ lttng_payload_view_from_payload(
+ &payload_copy, 0, -1);
+
+ for (i = 0; i < nb_events; i++) {
+ struct lttng_event *event = (typeof(event))(
+ listing.data +
+ (sizeof(struct lttng_event) * i));
+ const struct lttcomm_event_extended_header *ext_comm =
+ (typeof(ext_comm)) comm_ext_at;
+ struct lttng_event_extended *event_extended =
+ (typeof(event_extended))(listing.data +
+ listing.size);
+
+ /* Insert struct lttng_event_extended. */
+ ret = lttng_dynamic_buffer_set_size(&listing,
+ listing.size + sizeof(*event_extended));
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+ event->extended.ptr = event_extended;
+
+ comm_ext_at += sizeof(*ext_comm);
+
+ /* Insert filter expression. */
+ if (ext_comm->filter_len) {
+ event_extended->filter_expression =
+ listing.data + listing.size;
+ ret = lttng_dynamic_buffer_append(&listing,
+ comm_ext_at,
+ ext_comm->filter_len);
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+ comm_ext_at += ext_comm->filter_len;
+ }
+
+ /* Insert exclusions. */
+ if (ext_comm->nb_exclusions) {
+ event_extended->exclusions.count =
+ ext_comm->nb_exclusions;
+ event_extended->exclusions.strings =
+ listing.data + listing.size;
+
+ ret = lttng_dynamic_buffer_append(&listing,
+ comm_ext_at,
+ ext_comm->nb_exclusions *
+ LTTNG_SYMBOL_NAME_LEN);
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+ comm_ext_at += ext_comm->nb_exclusions *
+ LTTNG_SYMBOL_NAME_LEN;
+ }
+
+ /* Insert padding to align to 64-bits. */
+ ret = lttng_dynamic_buffer_set_size(&listing,
+ ALIGN_TO(listing.size,
+ sizeof(uint64_t)));
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto free_dynamic_buffer;
+ }
+
+ /* Insert flattened userspace probe location. */
+ if (ext_comm->userspace_probe_location_len) {
+ struct lttng_userspace_probe_location
+ *probe_location = NULL;
+ struct lttng_payload_view probe_location_view = lttng_payload_view_from_view(
+ &payload_copy_view,
+ (const char *) comm_ext_at -
+ payload_copy_view.buffer.data,
+ ext_comm->userspace_probe_location_len);
+
+ if (!lttng_payload_view_is_valid(&probe_location_view)) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto free_dynamic_buffer;
+ }
+
+ ret = lttng_userspace_probe_location_create_from_payload(
+ &probe_location_view,
+ &probe_location);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto free_dynamic_buffer;
+ }
+
+ event_extended->probe_location = (struct lttng_userspace_probe_location
+ *) (listing.data +
+ listing.size);
+ ret = lttng_userspace_probe_location_flatten(
+ probe_location, &listing);
+ lttng_userspace_probe_location_destroy(
+ probe_location);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto free_dynamic_buffer;
+ }
+
+ comm_ext_at += ext_comm->userspace_probe_location_len;
+ }
+ }
+ }
+
+ /* Don't reset listing buffer as we return its content. */
+ *events = (struct lttng_event *) listing.data;
+ lttng_dynamic_buffer_init(&listing);
+ ret = (int) nb_events;
+free_dynamic_buffer:
+ lttng_dynamic_buffer_reset(&listing);
+end:
+ lttng_payload_reset(&payload);
+ lttng_payload_reset(&payload_copy);
+ return ret;
+}
+
+/*
+ * Sets the tracing_group variable with name.
+ * This function allocates memory pointed to by tracing_group.
+ * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
+ */
+int lttng_set_tracing_group(const char *name)
+{
+ if (name == NULL) {
+ return -LTTNG_ERR_INVALID;
+ }
+
+ if (asprintf(&tracing_group, "%s", name) < 0) {
+ return -LTTNG_ERR_FATAL;
+ }
+
+ return 0;
+}
+
+int lttng_calibrate(struct lttng_handle *handle,
+ struct lttng_calibrate *calibrate)
+{
+ /*
+ * This command was removed in LTTng 2.9.
+ */
+ return -LTTNG_ERR_UND;
+}
+
+/*
+ * Set default channel attributes.
+ * If either or both of the arguments are null, attr content is zeroe'd.
+ */
+void lttng_channel_set_default_attr(struct lttng_domain *domain,
+ struct lttng_channel_attr *attr)
+{
+ struct lttng_channel_extended *extended;
+
+ /* Safety check */
+ if (attr == NULL || domain == NULL) {
+ return;
+ }
+
+ extended = (struct lttng_channel_extended *) attr->extended.ptr;
+ memset(attr, 0, sizeof(struct lttng_channel_attr));
+
+ /* Same for all domains. */
+ attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
+ attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
+ attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
+
+ switch (domain->type) {
+ case LTTNG_DOMAIN_KERNEL:
+ attr->switch_timer_interval =
+ DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
+ attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
+ attr->subbuf_size = default_get_kernel_channel_subbuf_size();
+ attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
+ attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
+ if (extended) {
+ extended->monitor_timer_interval =
+ DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER;
+ extended->blocking_timeout =
+ DEFAULT_KERNEL_CHANNEL_BLOCKING_TIMEOUT;
+ }
+ break;
+ case LTTNG_DOMAIN_UST:
+ switch (domain->buf_type) {
+ case LTTNG_BUFFER_PER_UID:
+ attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
+ attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
+ attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
+ attr->switch_timer_interval =
+ DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
+ attr->read_timer_interval =
+ DEFAULT_UST_UID_CHANNEL_READ_TIMER;
+ if (extended) {
+ extended->monitor_timer_interval =
+ DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER;
+ extended->blocking_timeout =
+ DEFAULT_UST_UID_CHANNEL_BLOCKING_TIMEOUT;
+ }
+ break;
+ case LTTNG_BUFFER_PER_PID:
+ default:
+ attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
+ attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
+ attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
+ attr->switch_timer_interval =
+ DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
+ attr->read_timer_interval =
+ DEFAULT_UST_PID_CHANNEL_READ_TIMER;
+ if (extended) {
+ extended->monitor_timer_interval =
+ DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER;
+ extended->blocking_timeout =
+ DEFAULT_UST_PID_CHANNEL_BLOCKING_TIMEOUT;
+ }
+ break;
+ }
+ default:
+ /* Default behavior: leave set to 0. */
+ break;
+ }
+
+ attr->extended.ptr = extended;
+}
+
+int lttng_channel_get_discarded_event_count(struct lttng_channel *channel,
+ uint64_t *discarded_events)
+{
+ int ret = 0;
+ struct lttng_channel_extended *chan_ext;
+
+ if (!channel || !discarded_events) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ chan_ext = channel->attr.extended.ptr;
+ if (!chan_ext) {
+ /*
+ * This can happen since the lttng_channel structure is
+ * used for other tasks where this pointer is never set.
+ */
+ *discarded_events = 0;
+ goto end;
+ }
+
+ *discarded_events = chan_ext->discarded_events;
+end:
+ return ret;
+}
+
+int lttng_channel_get_lost_packet_count(struct lttng_channel *channel,
+ uint64_t *lost_packets)
+{
+ int ret = 0;
+ struct lttng_channel_extended *chan_ext;
+
+ if (!channel || !lost_packets) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ chan_ext = channel->attr.extended.ptr;
+ if (!chan_ext) {
+ /*
+ * This can happen since the lttng_channel structure is
+ * used for other tasks where this pointer is never set.
+ */
+ *lost_packets = 0;
+ goto end;
+ }
+
+ *lost_packets = chan_ext->lost_packets;
+end:
+ return ret;
+}
+
+int lttng_channel_get_monitor_timer_interval(struct lttng_channel *chan,
+ uint64_t *monitor_timer_interval)
+{
+ int ret = 0;
+
+ if (!chan || !monitor_timer_interval) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (!chan->attr.extended.ptr) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ *monitor_timer_interval = ((struct lttng_channel_extended *)
+ chan->attr.extended.ptr)->monitor_timer_interval;
+end:
+ return ret;
+}
+
+int lttng_channel_set_monitor_timer_interval(struct lttng_channel *chan,
+ uint64_t monitor_timer_interval)
+{
+ int ret = 0;
+
+ if (!chan || !chan->attr.extended.ptr) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ((struct lttng_channel_extended *)
+ chan->attr.extended.ptr)->monitor_timer_interval =
+ monitor_timer_interval;
+end:
+ return ret;
+}
+
+int lttng_channel_get_blocking_timeout(struct lttng_channel *chan,
+ int64_t *blocking_timeout)
+{
+ int ret = 0;
+
+ if (!chan || !blocking_timeout) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (!chan->attr.extended.ptr) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ *blocking_timeout = ((struct lttng_channel_extended *)
+ chan->attr.extended.ptr)->blocking_timeout;
+end:
+ return ret;
+}
+
+int lttng_channel_set_blocking_timeout(struct lttng_channel *chan,
+ int64_t blocking_timeout)
+{
+ int ret = 0;
+ int64_t msec_timeout;
+
+ if (!chan || !chan->attr.extended.ptr) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (blocking_timeout < 0 && blocking_timeout != -1) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /*
+ * LTTng-ust's use of poll() to implement this timeout mechanism forces
+ * us to accept a narrower range of values (msecs expressed as a signed
+ * 32-bit integer).
+ */
+ msec_timeout = blocking_timeout / 1000;
+ if (msec_timeout != (int32_t) msec_timeout) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ((struct lttng_channel_extended *)
+ chan->attr.extended.ptr)->blocking_timeout =
+ blocking_timeout;
+end:
+ return ret;
+}
+
+/*
+ * Check if session daemon is alive.
+ *
+ * Return 1 if alive or 0 if not.
+ * On error returns a negative value.
+ */
+int lttng_session_daemon_alive(void)
+{
+ int ret;
+
+ ret = set_session_daemon_path();
+ if (ret < 0) {
+ /* Error. */
+ return ret;
+ }
+
+ if (*sessiond_sock_path == '\0') {
+ /*
+ * No socket path set. Weird error which means the constructor
+ * was not called.
+ */
+ abort();
+ }
+
+ ret = try_connect_sessiond(sessiond_sock_path);
+ if (ret < 0) {
+ /* Not alive. */
+ return 0;
+ }
+
+ /* Is alive. */
+ return 1;
+}
+
+/*
+ * Set URL for a consumer for a session and domain.
+ *
+ * Return 0 on success, else a negative value.
+ */
+int lttng_set_consumer_url(struct lttng_handle *handle,
+ const char *control_url, const char *data_url)
+{
+ int ret;
+ ssize_t size;
+ struct lttcomm_session_msg lsm;
+ struct lttng_uri *uris = NULL;
+
+ if (handle == NULL || (control_url == NULL && data_url == NULL)) {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+
+ lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
+
+ ret = lttng_strncpy(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
+
+ size = uri_parse_str_urls(control_url, data_url, &uris);
+ if (size < 0) {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ lsm.u.uri.size = size;
+
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
+ sizeof(struct lttng_uri) * size, NULL);
+
+ free(uris);
+error:
+ return ret;
+}
+
+/*
+ * [OBSOLETE]
+ */
+int lttng_enable_consumer(struct lttng_handle *handle);
+int lttng_enable_consumer(struct lttng_handle *handle)
+{
+ return -ENOSYS;
+}
+
+/*
+ * [OBSOLETE]
+ */
+int lttng_disable_consumer(struct lttng_handle *handle);
+int lttng_disable_consumer(struct lttng_handle *handle)
+{
+ return -ENOSYS;
+}
+
+/*
+ * [OBSOLETE]
+ */
+int _lttng_create_session_ext(const char *name, const char *url,
+ const char *datetime);
+int _lttng_create_session_ext(const char *name, const char *url,
+ const char *datetime)
+{
+ return -ENOSYS;
+}
+
+/*
+ * For a given session name, this call checks if the data is ready to be read
+ * or is still being extracted by the consumer(s) hence not ready to be used by
+ * any readers.
+ */
+int lttng_data_pending(const char *session_name)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+ uint8_t *pending = NULL;
+
+ if (session_name == NULL) {
+ return -LTTNG_ERR_INVALID;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_DATA_PENDING;
+
+ ret = lttng_strncpy(lsm.session.name, session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pending);
+ if (ret < 0) {
+ goto end;
+ } else if (ret != 1) {
+ /* Unexpected payload size */
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ } else if (!pending) {
+ /* Internal error. */
+ ret = -LTTNG_ERR_UNK;
+ goto end;
+ }
+
+ ret = (int) *pending;
+end:
+ free(pending);
+ return ret;
+}
+
+/*
+ * Regenerate the metadata for a session.
+ * Return 0 on success, a negative error code on error.
+ */
+int lttng_regenerate_metadata(const char *session_name)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ if (!session_name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_REGENERATE_METADATA;
+
+ ret = lttng_strncpy(lsm.session.name, session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+ if (ret < 0) {
+ goto end;
+ }
+
+ ret = 0;
+end:
+ return ret;
+}
+
+/*
+ * Deprecated, replaced by lttng_regenerate_metadata.
+ */
+int lttng_metadata_regenerate(const char *session_name)
+{
+ return lttng_regenerate_metadata(session_name);
+}
+
+/*
+ * Regenerate the statedump of a session.
+ * Return 0 on success, a negative error code on error.
+ */
+int lttng_regenerate_statedump(const char *session_name)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ if (!session_name) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_REGENERATE_STATEDUMP;
+
+ ret = lttng_strncpy(lsm.session.name, session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+ if (ret < 0) {
+ goto end;
+ }
+
+ ret = 0;
+end:
+ return ret;
+}
+
+static
+int _lttng_register_trigger(struct lttng_trigger *trigger, const char *name,
+ bool generate_name)
+{
+ int ret;
+ struct lttcomm_session_msg lsm = {
+ .cmd_type = LTTNG_REGISTER_TRIGGER,
+ .u.trigger.is_trigger_anonymous = !name && !generate_name,
+ };
+ struct lttcomm_session_msg *message_lsm;
+ struct lttng_payload message;
+ struct lttng_payload reply;
+ struct lttng_trigger *reply_trigger = NULL;
+ enum lttng_domain_type domain_type;
+ const struct lttng_credentials user_creds = {
+ .uid = LTTNG_OPTIONAL_INIT_VALUE(geteuid()),
+ .gid = LTTNG_OPTIONAL_INIT_UNSET,
+ };
+ const char *unused_trigger_name = NULL;
+ enum lttng_trigger_status trigger_status;
+
+ lttng_payload_init(&message);
+ lttng_payload_init(&reply);
+
+ if (!trigger) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ trigger_status = lttng_trigger_get_name(trigger, &unused_trigger_name);
+ if (trigger_status != LTTNG_TRIGGER_STATUS_UNSET) {
+ /* Re-using already registered trigger. */
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (name) {
+ trigger_status = lttng_trigger_set_name(trigger, name);
+ if (trigger_status != LTTNG_TRIGGER_STATUS_OK) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+ }
+
+ if (!trigger->creds.uid.is_set) {
+ /* Use the client's credentials as the trigger credentials. */
+ lttng_trigger_set_credentials(trigger, &user_creds);
+ } else {
+ /*
+ * Validate that either the current trigger credentials and the
+ * client credentials are identical or that the current user is
+ * root. The root user can register, unregister triggers for
+ * himself and other users.
+ *
+ * This check is also present on the sessiond side, using the
+ * credentials passed on the socket. These check are all
+ * "safety" checks.
+ */
+ const struct lttng_credentials *trigger_creds =
+ lttng_trigger_get_credentials(trigger);
+
+ if (!lttng_credentials_is_equal_uid(trigger_creds, &user_creds)) {
+ if (lttng_credentials_get_uid(&user_creds) != 0) {
+ ret = -LTTNG_ERR_EPERM;
+ goto end_unset_name;
+ }
+ }
+ }
+
+ if (!lttng_trigger_validate(trigger)) {
+ ret = -LTTNG_ERR_INVALID_TRIGGER;
+ goto end_unset_name;
+ }
+
+ domain_type = lttng_trigger_get_underlying_domain_type_restriction(
+ trigger);
+
+ lsm.domain.type = domain_type;
+
+ ret = lttng_dynamic_buffer_append(&message.buffer, &lsm, sizeof(lsm));
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end_unset_name;
+ }
+
+ ret = lttng_trigger_serialize(trigger, &message);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_UNK;
+ goto end_unset_name;
+ }
+
+ /*
+ * This is needed to populate the trigger object size for the command
+ * header.
+ */
+ message_lsm = (struct lttcomm_session_msg *) message.buffer.data;
+
+ message_lsm->u.trigger.length = (uint32_t) message.buffer.size - sizeof(lsm);
+
+ {
+ struct lttng_payload_view message_view =
+ lttng_payload_view_from_payload(
+ &message, 0, -1);
+
+ message_lsm->fd_count = lttng_payload_view_get_fd_handle_count(
+ &message_view);
+ ret = lttng_ctl_ask_sessiond_payload(&message_view, &reply);
+ if (ret < 0) {
+ goto end_unset_name;
+ }
+ }
+
+ {
+ struct lttng_payload_view reply_view =
+ lttng_payload_view_from_payload(
+ &reply, 0, reply.buffer.size);
+
+ ret = lttng_trigger_create_from_payload(
+ &reply_view, &reply_trigger);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_INVALID_PROTOCOL;
+ goto end_unset_name;
+ }
+ }
+
+ if (name || generate_name) {
+ ret = lttng_trigger_assign_name(trigger, reply_trigger);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+ }
+
+ ret = 0;
+ goto end;
+
+end_unset_name:
+ trigger_status = lttng_trigger_set_name(trigger, NULL);
+ if (trigger_status != LTTNG_TRIGGER_STATUS_OK) {
+ ret = -LTTNG_ERR_UNK;
+ }
+end:
+ lttng_payload_reset(&message);
+ lttng_payload_reset(&reply);
+ lttng_trigger_destroy(reply_trigger);
+ return ret;
+}
+
+int lttng_register_trigger(struct lttng_trigger *trigger)
+{
+ /* Register an anonymous trigger. */
+ return _lttng_register_trigger(trigger, NULL, false);
+}
+
+enum lttng_error_code lttng_register_trigger_with_name(
+ struct lttng_trigger *trigger, const char *name)
+{
+ const int ret = _lttng_register_trigger(trigger, name, false);
+
+ return ret == 0 ? LTTNG_OK : (enum lttng_error_code) -ret;
+}
+
+enum lttng_error_code lttng_register_trigger_with_automatic_name(
+ struct lttng_trigger *trigger)
+{
+ const int ret = _lttng_register_trigger(trigger, false, true);
+
+ return ret == 0 ? LTTNG_OK : (enum lttng_error_code) -ret;
+}
+
+enum lttng_error_code lttng_error_query_execute(
+ const struct lttng_error_query *query,
+ const struct lttng_endpoint *endpoint,
+ struct lttng_error_query_results **results)
+{
+ int ret;
+ enum lttng_error_code ret_code;
+ struct lttcomm_session_msg lsm = {
+ .cmd_type = LTTNG_EXECUTE_ERROR_QUERY,
+ };
+ struct lttng_payload message;
+ struct lttng_payload reply;
+ struct lttcomm_session_msg *message_lsm;
+
+ lttng_payload_init(&message);
+ lttng_payload_init(&reply);
+
+ if (!query || !results) {
+ ret_code = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (endpoint != lttng_session_daemon_command_endpoint) {
+ ret_code = LTTNG_ERR_INVALID_ERROR_QUERY_TARGET;
+ goto end;
+ }
+
+ ret = lttng_dynamic_buffer_append(&message.buffer, &lsm, sizeof(lsm));
+ if (ret) {
+ ret_code = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ ret = lttng_error_query_serialize(query, &message);
+ if (ret) {
+ ret_code = LTTNG_ERR_UNK;
+ goto end;
+ }
+
+ message_lsm = (struct lttcomm_session_msg *) message.buffer.data;
+ message_lsm->u.error_query.length =
+ (uint32_t) message.buffer.size - sizeof(lsm);
+
+ {
+ struct lttng_payload_view message_view =
+ lttng_payload_view_from_payload(
+ &message, 0, -1);
+
+ message_lsm->fd_count = lttng_payload_view_get_fd_handle_count(
+ &message_view);
+ ret = lttng_ctl_ask_sessiond_payload(&message_view, &reply);
+ if (ret < 0) {
+ ret_code = -ret;
+ goto end;
+ }
+ }
+
+ {
+ ssize_t reply_create_ret;
+ struct lttng_payload_view reply_view =
+ lttng_payload_view_from_payload(
+ &reply, 0, reply.buffer.size);
+
+ reply_create_ret = lttng_error_query_results_create_from_payload(
+ &reply_view, results);
+ if (reply_create_ret < 0) {
+ ret_code = LTTNG_ERR_INVALID_PROTOCOL;
+ goto end;
+ }
+ }
+
+ ret_code = LTTNG_OK;
+end:
+ lttng_payload_reset(&message);
+ lttng_payload_reset(&reply);
+ return ret_code;
+}
+
+int lttng_unregister_trigger(const struct lttng_trigger *trigger)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+ struct lttcomm_session_msg *message_lsm;
+ struct lttng_payload message;
+ struct lttng_payload reply;
+ struct lttng_trigger *copy = NULL;
+ const struct lttng_credentials user_creds = {
+ .uid = LTTNG_OPTIONAL_INIT_VALUE(geteuid()),
+ .gid = LTTNG_OPTIONAL_INIT_UNSET,
+ };
+
+ lttng_payload_init(&message);
+ lttng_payload_init(&reply);
+
+ if (!trigger) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ copy = lttng_trigger_copy(trigger);
+ if (!copy) {
+ ret = -LTTNG_ERR_UNK;
+ goto end;
+ }
+
+ if (!copy->creds.uid.is_set) {
+ /* Use the client credentials as the trigger credentials */
+ lttng_trigger_set_credentials(copy, &user_creds);
+ } else {
+ /*
+ * Validate that either the current trigger credentials and the
+ * client credentials are identical or that the current user is
+ * root. The root user can register, unregister triggers for
+ * himself and other users.
+ *
+ * This check is also present on the sessiond side, using the
+ * credentials passed on the socket. These check are all
+ * "safety" checks.
+ */
+ const struct lttng_credentials *trigger_creds =
+ lttng_trigger_get_credentials(copy);
+ if (!lttng_credentials_is_equal_uid(trigger_creds, &user_creds)) {
+ if (lttng_credentials_get_uid(&user_creds) != 0) {
+ ret = -LTTNG_ERR_EPERM;
+ goto end;
+ }
+ }
+ }
+
+ if (!lttng_trigger_validate(copy)) {
+ ret = -LTTNG_ERR_INVALID_TRIGGER;
+ goto end;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_UNREGISTER_TRIGGER;
+
+ ret = lttng_dynamic_buffer_append(&message.buffer, &lsm, sizeof(lsm));
+ if (ret) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ ret = lttng_trigger_serialize(copy, &message);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_UNK;
+ goto end;
+ }
+
+ /*
+ * This is needed to populate the trigger object size for the command
+ * header and number of fds sent.
+ */
+ message_lsm = (struct lttcomm_session_msg *) message.buffer.data;
+
+ message_lsm->u.trigger.length = (uint32_t) message.buffer.size - sizeof(lsm);
+
+ {
+ struct lttng_payload_view message_view =
+ lttng_payload_view_from_payload(
+ &message, 0, -1);
+
+ /*
+ * Update the message header with the number of fd that will be
+ * sent.
+ */
+ message_lsm->fd_count = lttng_payload_view_get_fd_handle_count(
+ &message_view);
+
+ ret = lttng_ctl_ask_sessiond_payload(&message_view, &reply);
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ ret = 0;
+end:
+ lttng_trigger_destroy(copy);
+ lttng_payload_reset(&message);
+ lttng_payload_reset(&reply);
+ return ret;
+}
+
+/*
+ * Ask the session daemon for all registered triggers for the current user.
+ *
+ * Allocates and return an lttng_triggers set.
+ * On error, returns a suitable lttng_error_code.
+ */
+enum lttng_error_code lttng_list_triggers(struct lttng_triggers **triggers)
+{
+ int ret;
+ enum lttng_error_code ret_code = LTTNG_OK;
+ struct lttcomm_session_msg lsm = { .cmd_type = LTTNG_LIST_TRIGGERS };
+ struct lttng_triggers *local_triggers = NULL;
+ struct lttng_payload reply;
+ struct lttng_payload_view lsm_view =
+ lttng_payload_view_init_from_buffer(
+ (const char *) &lsm, 0, sizeof(lsm));
+
+ lttng_payload_init(&reply);
+
+ ret = lttng_ctl_ask_sessiond_payload(&lsm_view, &reply);
+ if (ret < 0) {
+ ret_code = (enum lttng_error_code) -ret;
+ goto end;
+ }
+
+ {
+ struct lttng_payload_view reply_view =
+ lttng_payload_view_from_payload(
+ &reply, 0, reply.buffer.size);
+
+ ret = lttng_triggers_create_from_payload(
+ &reply_view, &local_triggers);
+ if (ret < 0) {
+ ret_code = LTTNG_ERR_FATAL;
+ goto end;
+ }
+ }
+
+ *triggers = local_triggers;
+ local_triggers = NULL;
+end:
+ lttng_payload_reset(&reply);
+ lttng_triggers_destroy(local_triggers);
+ return ret_code;
+}
+
+/*
+ * lib constructor.