+
+/*
+ * Rotate all the channels of a session.
+ *
+ * Return LTTNG_OK on success or else an LTTng error code.
+ */
+enum lttng_error_code ust_app_rotate_session(struct ltt_session *session)
+{
+ int ret;
+ enum lttng_error_code cmd_ret = LTTNG_OK;
+ struct lttng_ht_iter iter;
+ struct ust_app *app;
+ struct ltt_ust_session *usess = session->ust_session;
+
+ 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) {
+ cmd_ret = LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ /* Rotate the data channels. */
+ cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
+ reg_chan, node.node) {
+ ret = consumer_rotate_channel(socket,
+ reg_chan->consumer_key,
+ usess->uid, usess->gid,
+ usess->consumer,
+ /* is_metadata_channel */ false);
+ if (ret < 0) {
+ cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
+ 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,
+ /* is_metadata_channel */ true);
+ if (ret < 0) {
+ cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
+ goto error;
+ }
+ }
+ 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;
+ }
+
+ /* Get the right consumer socket for the application. */
+ socket = consumer_find_socket_by_bitness(app->bits_per_long,
+ usess->consumer);
+ if (!socket) {
+ cmd_ret = LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ registry = get_session_registry(ua_sess);
+ if (!registry) {
+ DBG("Application session is being torn down. Skip application.");
+ continue;
+ }
+
+ /* Rotate the data channels. */
+ cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
+ ua_chan, node.node) {
+ ret = consumer_rotate_channel(socket,
+ ua_chan->key,
+ ua_sess->effective_credentials
+ .uid,
+ ua_sess->effective_credentials
+ .gid,
+ ua_sess->consumer,
+ /* is_metadata_channel */ false);
+ if (ret < 0) {
+ /* Per-PID buffer and application going away. */
+ if (ret == -LTTNG_ERR_CHAN_NOT_FOUND)
+ continue;
+ cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
+ goto error;
+ }
+ }
+
+ /* Rotate the metadata channel. */
+ (void) push_metadata(registry, usess->consumer);
+ ret = consumer_rotate_channel(socket,
+ registry->metadata_key,
+ ua_sess->effective_credentials.uid,
+ ua_sess->effective_credentials.gid,
+ ua_sess->consumer,
+ /* is_metadata_channel */ true);
+ if (ret < 0) {
+ /* Per-PID buffer and application going away. */
+ if (ret == -LTTNG_ERR_CHAN_NOT_FOUND)
+ continue;
+ cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
+ goto error;
+ }
+ }
+ break;
+ }
+ default:
+ assert(0);
+ break;
+ }
+
+ cmd_ret = LTTNG_OK;
+
+error:
+ rcu_read_unlock();
+ return cmd_ret;
+}
+
+enum lttng_error_code ust_app_create_channel_subdirectories(
+ const struct ltt_ust_session *usess)
+{
+ enum lttng_error_code ret = LTTNG_OK;
+ struct lttng_ht_iter iter;
+ enum lttng_trace_chunk_status chunk_status;
+ char *pathname_index;
+ int fmt_ret;
+
+ assert(usess->current_trace_chunk);
+ 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) {
+ fmt_ret = asprintf(&pathname_index,
+ DEFAULT_UST_TRACE_DIR DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR,
+ reg->uid, reg->bits_per_long);
+ if (fmt_ret < 0) {
+ ERR("Failed to format channel index directory");
+ ret = LTTNG_ERR_CREATE_DIR_FAIL;
+ goto error;
+ }
+
+ /*
+ * Create the index subdirectory which will take care
+ * of implicitly creating the channel's path.
+ */
+ chunk_status = lttng_trace_chunk_create_subdirectory(
+ usess->current_trace_chunk,
+ pathname_index);
+ free(pathname_index);
+ if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+ ret = LTTNG_ERR_CREATE_DIR_FAIL;
+ goto error;
+ }
+ }
+ break;
+ }
+ case LTTNG_BUFFER_PER_PID:
+ {
+ struct ust_app *app;
+
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app,
+ pid_n.node) {
+ 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;
+ }
+
+ registry = get_session_registry(ua_sess);
+ if (!registry) {
+ DBG("Application session is being torn down. Skip application.");
+ continue;
+ }
+
+ fmt_ret = asprintf(&pathname_index,
+ DEFAULT_UST_TRACE_DIR "%s/" DEFAULT_INDEX_DIR,
+ ua_sess->path);
+ if (fmt_ret < 0) {
+ ERR("Failed to format channel index directory");
+ ret = LTTNG_ERR_CREATE_DIR_FAIL;
+ goto error;
+ }
+ /*
+ * Create the index subdirectory which will take care
+ * of implicitly creating the channel's path.
+ */
+ chunk_status = lttng_trace_chunk_create_subdirectory(
+ usess->current_trace_chunk,
+ pathname_index);
+ free(pathname_index);
+ if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+ ret = LTTNG_ERR_CREATE_DIR_FAIL;
+ goto error;
+ }
+ }
+ break;
+ }
+ default:
+ abort();
+ }
+
+ ret = LTTNG_OK;
+error:
+ rcu_read_unlock();
+ return ret;
+}