+ return tot_size;
+}
+
+int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
+ struct cds_list_head *buffer_reg_uid_list,
+ struct consumer_output *consumer, uint64_t uchan_id,
+ int overwrite, uint64_t *discarded, uint64_t *lost)
+{
+ int ret;
+ uint64_t consumer_chan_key;
+
+ *discarded = 0;
+ *lost = 0;
+
+ ret = buffer_reg_uid_consumer_channel_key(
+ buffer_reg_uid_list, uchan_id, &consumer_chan_key);
+ if (ret < 0) {
+ /* Not found */
+ ret = 0;
+ goto end;
+ }
+
+ if (overwrite) {
+ ret = consumer_get_lost_packets(ust_session_id,
+ consumer_chan_key, consumer, lost);
+ } else {
+ ret = consumer_get_discarded_events(ust_session_id,
+ consumer_chan_key, consumer, discarded);
+ }
+
+end:
+ return ret;
+}
+
+int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
+ struct ltt_ust_channel *uchan,
+ struct consumer_output *consumer, int overwrite,
+ uint64_t *discarded, uint64_t *lost)
+{
+ int ret = 0;
+ struct lttng_ht_iter iter;
+ struct lttng_ht_node_str *ua_chan_node;
+ struct ust_app *app;
+ struct ust_app_session *ua_sess;
+ struct ust_app_channel *ua_chan;
+
+ *discarded = 0;
+ *lost = 0;
+
+ rcu_read_lock();
+ /*
+ * Iterate over every registered applications. Sum counters for
+ * all applications containing requested session and channel.
+ */
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
+ struct lttng_ht_iter uiter;
+
+ ua_sess = lookup_session_by_app(usess, app);
+ if (ua_sess == NULL) {
+ continue;
+ }
+
+ /* Get channel */
+ lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter);
+ ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
+ /* If the session is found for the app, the channel must be there */
+ assert(ua_chan_node);
+
+ ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
+
+ if (overwrite) {
+ uint64_t _lost;
+
+ ret = consumer_get_lost_packets(usess->id, ua_chan->key,
+ consumer, &_lost);
+ if (ret < 0) {
+ break;
+ }
+ (*lost) += _lost;
+ } else {
+ uint64_t _discarded;
+
+ ret = consumer_get_discarded_events(usess->id,
+ ua_chan->key, consumer, &_discarded);
+ if (ret < 0) {
+ break;
+ }
+ (*discarded) += _discarded;
+ }
+ }
+
+ rcu_read_unlock();
+ return ret;
+}
+
+static
+int ust_app_regenerate_statedump(struct ltt_ust_session *usess,
+ struct ust_app *app)
+{
+ int ret = 0;
+ struct ust_app_session *ua_sess;
+
+ DBG("Regenerating the metadata for ust app pid %d", app->pid);
+
+ rcu_read_lock();
+
+ ua_sess = lookup_session_by_app(usess, app);
+ if (ua_sess == NULL) {
+ /* The session is in teardown process. Ignore and continue. */
+ goto end;
+ }
+
+ pthread_mutex_lock(&ua_sess->lock);
+
+ if (ua_sess->deleted) {
+ goto end_unlock;
+ }
+
+ pthread_mutex_lock(&app->sock_lock);
+ ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle);
+ pthread_mutex_unlock(&app->sock_lock);
+
+end_unlock:
+ pthread_mutex_unlock(&ua_sess->lock);
+
+end:
+ rcu_read_unlock();
+ health_code_update();
+ return ret;
+}
+
+/*
+ * Regenerate the statedump for each app in the session.
+ */
+int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess)
+{
+ int ret = 0;
+ struct lttng_ht_iter iter;
+ struct ust_app *app;
+
+ DBG("Regenerating the metadata for all UST apps");
+
+ rcu_read_lock();
+
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
+ if (!app->compatible) {
+ continue;
+ }
+
+ ret = ust_app_regenerate_statedump(usess, app);
+ if (ret < 0) {
+ /* Continue to the next app even on error */
+ continue;
+ }
+ }
+
+ rcu_read_unlock();
+
+ return 0;
+}
+
+/*
+ * Rotate all the channels of a session.
+ *
+ * Return 0 on success or else a negative value.
+ */
+int ust_app_rotate_session(struct ltt_session *session, bool *ust_active)
+{
+ int ret = 0;
+ struct lttng_ht_iter iter;
+ struct ust_app *app;
+ struct ltt_ust_session *usess = session->ust_session;
+ char pathname[LTTNG_PATH_MAX];
+
+ assert(usess);
+
+ rcu_read_lock();
+
+ switch (usess->buffer_type) {
+ case LTTNG_BUFFER_PER_UID:
+ {
+ struct buffer_reg_uid *reg;
+
+ cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
+ struct buffer_reg_channel *reg_chan;
+ struct consumer_socket *socket;
+
+ /* Get consumer socket to use to push the metadata.*/
+ socket = consumer_find_socket_by_bitness(reg->bits_per_long,
+ usess->consumer);
+ if (!socket) {
+ ret = -EINVAL;
+ goto error;
+ }
+
+ /*
+ * Account the metadata channel first to make sure the
+ * number of channels waiting for a rotation cannot
+ * reach 0 before we complete the iteration over all
+ * the channels.
+ */
+ ret = rotate_add_channel_pending(
+ reg->registry->reg.ust->metadata_key,
+ LTTNG_DOMAIN_UST, session);
+ if (ret < 0) {
+ ret = reg->bits_per_long == 32 ?
+ -LTTNG_ERR_UST_CONSUMER32_FAIL :
+ -LTTNG_ERR_UST_CONSUMER64_FAIL;
+ goto error;
+ }
+
+ ret = snprintf(pathname, sizeof(pathname),
+ DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH,
+ reg->uid, reg->bits_per_long);
+ if (ret < 0 || ret == sizeof(pathname)) {
+ PERROR("Failed to format rotation path");
+ goto error;
+ }
+
+ /* Rotate the data channels. */
+ cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
+ reg_chan, node.node) {
+ ret = rotate_add_channel_pending(
+ reg_chan->consumer_key,
+ LTTNG_DOMAIN_UST, session);
+ if (ret < 0) {
+ ret = reg->bits_per_long == 32 ?
+ -LTTNG_ERR_UST_CONSUMER32_FAIL :
+ -LTTNG_ERR_UST_CONSUMER64_FAIL;
+ goto error;
+ }
+ ret = consumer_rotate_channel(socket,
+ reg_chan->consumer_key,
+ usess->uid, usess->gid,
+ usess->consumer, pathname,
+ /* is_metadata_channel */ false,
+ session->current_archive_id,
+ &session->rotate_pending_relay);
+ if (ret < 0) {
+ goto error;
+ }
+ }
+
+ (void) push_metadata(reg->registry->reg.ust, usess->consumer);
+
+ ret = consumer_rotate_channel(socket,
+ reg->registry->reg.ust->metadata_key,
+ usess->uid, usess->gid,
+ usess->consumer, pathname,
+ /* is_metadata_channel */ true,
+ session->current_archive_id,
+ &session->rotate_pending_relay);
+ if (ret < 0) {
+ goto error;
+ }
+ *ust_active = true;
+ }
+ break;
+ }
+ case LTTNG_BUFFER_PER_PID:
+ {
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
+ struct consumer_socket *socket;
+ struct lttng_ht_iter chan_iter;
+ struct ust_app_channel *ua_chan;
+ struct ust_app_session *ua_sess;
+ struct ust_registry_session *registry;
+
+ ua_sess = lookup_session_by_app(usess, app);
+ if (!ua_sess) {
+ /* Session not associated with this app. */
+ continue;
+ }
+ ret = snprintf(pathname, sizeof(pathname),
+ DEFAULT_UST_TRACE_DIR "/%s",
+ ua_sess->path);
+ if (ret < 0 || ret == sizeof(pathname)) {
+ PERROR("Failed to format rotation path");
+ goto error;
+ }
+
+ /* Get the right consumer socket for the application. */
+ socket = consumer_find_socket_by_bitness(app->bits_per_long,
+ usess->consumer);
+ if (!socket) {
+ ret = -EINVAL;
+ goto error;
+ }
+
+ registry = get_session_registry(ua_sess);
+ if (!registry) {
+ DBG("Application session is being torn down. Abort snapshot record.");
+ ret = -1;
+ goto error;
+ }
+
+ /*
+ * Account the metadata channel first to make sure the
+ * number of channels waiting for a rotation cannot
+ * reach 0 before we complete the iteration over all
+ * the channels.
+ */
+ ret = rotate_add_channel_pending(registry->metadata_key,
+ LTTNG_DOMAIN_UST, session);
+ if (ret < 0) {
+ ret = app->bits_per_long == 32 ?
+ -LTTNG_ERR_UST_CONSUMER32_FAIL :
+ -LTTNG_ERR_UST_CONSUMER64_FAIL;
+ goto error;
+ }
+
+ /* Rotate the data channels. */
+ cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
+ ua_chan, node.node) {
+ ret = rotate_add_channel_pending(
+ ua_chan->key, LTTNG_DOMAIN_UST,
+ session);
+ if (ret < 0) {
+ ret = app->bits_per_long == 32 ?
+ -LTTNG_ERR_UST_CONSUMER32_FAIL :
+ -LTTNG_ERR_UST_CONSUMER64_FAIL;
+ goto error;
+ }
+ ret = consumer_rotate_channel(socket, ua_chan->key,
+ ua_sess->euid, ua_sess->egid,
+ ua_sess->consumer, pathname,
+ /* is_metadata_channel */ false,
+ session->current_archive_id,
+ &session->rotate_pending_relay);
+ if (ret < 0) {
+ goto error;
+ }
+ }
+
+ /* Rotate the metadata channel. */
+ (void) push_metadata(registry, usess->consumer);
+ ret = consumer_rotate_channel(socket, registry->metadata_key,
+ ua_sess->euid, ua_sess->egid,
+ ua_sess->consumer, pathname,
+ /* is_metadata_channel */ true,
+ session->current_archive_id,
+ &session->rotate_pending_relay);
+ if (ret < 0) {
+ goto error;
+ }
+ *ust_active = true;
+ }
+ break;
+ }
+ default:
+ assert(0);
+ break;
+ }
+
+ ret = LTTNG_OK;
+
+error:
+ rcu_read_unlock();