+
+/*
+ * Ask the consumer if the data is ready to read (NOT pending) for the specific
+ * session id.
+ *
+ * This function has a different behavior with the consumer i.e. that it waits
+ * for a reply from the consumer if yes or no the data is pending.
+ */
+int consumer_is_data_pending(uint64_t session_id,
+ struct consumer_output *consumer)
+{
+ int ret;
+ int32_t ret_code = 0; /* Default is that the data is NOT pending */
+ struct consumer_socket *socket;
+ struct lttng_ht_iter iter;
+ struct lttcomm_consumer_msg msg;
+
+ assert(consumer);
+
+ DBG3("Consumer data pending for id %" PRIu64, session_id);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_DATA_PENDING;
+ msg.u.data_pending.session_id = session_id;
+
+ /* Send command for each consumer */
+ rcu_read_lock();
+ cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
+ node.node) {
+ pthread_mutex_lock(socket->lock);
+ ret = consumer_socket_send(socket, &msg, sizeof(msg));
+ if (ret < 0) {
+ pthread_mutex_unlock(socket->lock);
+ goto error_unlock;
+ }
+
+ /*
+ * No need for a recv reply status because the answer to the command is
+ * the reply status message.
+ */
+
+ ret = consumer_socket_recv(socket, &ret_code, sizeof(ret_code));
+ if (ret < 0) {
+ pthread_mutex_unlock(socket->lock);
+ goto error_unlock;
+ }
+ pthread_mutex_unlock(socket->lock);
+
+ if (ret_code == 1) {
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+ DBG("Consumer data is %s pending for session id %" PRIu64,
+ ret_code == 1 ? "" : "NOT", session_id);
+ return ret_code;
+
+error_unlock:
+ rcu_read_unlock();
+ return -1;
+}
+
+/*
+ * Send a flush command to consumer using the given channel key.
+ *
+ * Return 0 on success else a negative value.
+ */
+int consumer_flush_channel(struct consumer_socket *socket, uint64_t key)
+{
+ int ret;
+ struct lttcomm_consumer_msg msg;
+
+ assert(socket);
+
+ DBG2("Consumer flush channel key %" PRIu64, key);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_FLUSH_CHANNEL;
+ msg.u.flush_channel.key = key;
+
+ pthread_mutex_lock(socket->lock);
+ health_code_update();
+
+ ret = consumer_send_msg(socket, &msg);
+ if (ret < 0) {
+ goto end;
+ }
+
+end:
+ health_code_update();
+ pthread_mutex_unlock(socket->lock);
+ return ret;
+}
+
+/*
+ * Send a close metadata command to consumer using the given channel key.
+ * Called with registry lock held.
+ *
+ * Return 0 on success else a negative value.
+ */
+int consumer_close_metadata(struct consumer_socket *socket,
+ uint64_t metadata_key)
+{
+ int ret;
+ struct lttcomm_consumer_msg msg;
+
+ assert(socket);
+
+ DBG2("Consumer close metadata channel key %" PRIu64, metadata_key);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_CLOSE_METADATA;
+ msg.u.close_metadata.key = metadata_key;
+
+ pthread_mutex_lock(socket->lock);
+ health_code_update();
+
+ ret = consumer_send_msg(socket, &msg);
+ if (ret < 0) {
+ goto end;
+ }
+
+end:
+ health_code_update();
+ pthread_mutex_unlock(socket->lock);
+ return ret;
+}
+
+/*
+ * Send a setup metdata command to consumer using the given channel key.
+ *
+ * Return 0 on success else a negative value.
+ */
+int consumer_setup_metadata(struct consumer_socket *socket,
+ uint64_t metadata_key)
+{
+ int ret;
+ struct lttcomm_consumer_msg msg;
+
+ assert(socket);
+
+ DBG2("Consumer setup metadata channel key %" PRIu64, metadata_key);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_SETUP_METADATA;
+ msg.u.setup_metadata.key = metadata_key;
+
+ pthread_mutex_lock(socket->lock);
+ health_code_update();
+
+ ret = consumer_send_msg(socket, &msg);
+ if (ret < 0) {
+ goto end;
+ }
+
+end:
+ health_code_update();
+ pthread_mutex_unlock(socket->lock);
+ return ret;
+}
+
+/*
+ * Send metadata string to consumer.
+ * RCU read-side lock must be held to guarantee existence of socket.
+ *
+ * Return 0 on success else a negative value.
+ */
+int consumer_push_metadata(struct consumer_socket *socket,
+ uint64_t metadata_key, char *metadata_str, size_t len,
+ size_t target_offset)
+{
+ int ret;
+ struct lttcomm_consumer_msg msg;
+
+ assert(socket);
+
+ DBG2("Consumer push metadata to consumer socket %d", *socket->fd_ptr);
+
+ pthread_mutex_lock(socket->lock);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_PUSH_METADATA;
+ msg.u.push_metadata.key = metadata_key;
+ msg.u.push_metadata.target_offset = target_offset;
+ msg.u.push_metadata.len = len;
+
+ health_code_update();
+ ret = consumer_send_msg(socket, &msg);
+ if (ret < 0 || len == 0) {
+ goto end;
+ }
+
+ DBG3("Consumer pushing metadata on sock %d of len %zu", *socket->fd_ptr,
+ len);
+
+ ret = consumer_socket_send(socket, metadata_str, len);
+ if (ret < 0) {
+ goto end;
+ }
+
+ health_code_update();
+ ret = consumer_recv_status_reply(socket);
+ if (ret < 0) {
+ goto end;
+ }
+
+end:
+ pthread_mutex_unlock(socket->lock);
+ health_code_update();
+ return ret;
+}
+
+/*
+ * Ask the consumer to snapshot a specific channel using the key.
+ *
+ * Return 0 on success or else a negative error.
+ */
+int consumer_snapshot_channel(struct consumer_socket *socket, uint64_t key,
+ struct snapshot_output *output, int metadata, uid_t uid, gid_t gid,
+ const char *session_path, int wait, uint64_t nb_packets_per_stream)
+{
+ int ret;
+ struct lttcomm_consumer_msg msg;
+
+ assert(socket);
+ assert(output);
+ assert(output->consumer);
+
+ DBG("Consumer snapshot channel key %" PRIu64, key);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_SNAPSHOT_CHANNEL;
+ msg.u.snapshot_channel.key = key;
+ msg.u.snapshot_channel.nb_packets_per_stream = nb_packets_per_stream;
+ msg.u.snapshot_channel.metadata = metadata;
+
+ if (output->consumer->type == CONSUMER_DST_NET) {
+ msg.u.snapshot_channel.relayd_id = output->consumer->net_seq_index;
+ msg.u.snapshot_channel.use_relayd = 1;
+ ret = snprintf(msg.u.snapshot_channel.pathname,
+ sizeof(msg.u.snapshot_channel.pathname),
+ "%s/%s-%s-%" PRIu64 "%s", output->consumer->subdir,
+ output->name, output->datetime, output->nb_snapshot,
+ session_path);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto error;
+ }
+ } else {
+ ret = snprintf(msg.u.snapshot_channel.pathname,
+ sizeof(msg.u.snapshot_channel.pathname),
+ "%s/%s-%s-%" PRIu64 "%s", output->consumer->dst.trace_path,
+ output->name, output->datetime, output->nb_snapshot,
+ session_path);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto error;
+ }
+ msg.u.snapshot_channel.relayd_id = (uint64_t) -1ULL;
+
+ /* Create directory. Ignore if exist. */
+ ret = run_as_mkdir_recursive(msg.u.snapshot_channel.pathname,
+ S_IRWXU | S_IRWXG, uid, gid);
+ if (ret < 0) {
+ if (ret != -EEXIST) {
+ ERR("Trace directory creation error");
+ goto error;
+ }
+ }
+ }
+
+ health_code_update();
+ ret = consumer_send_msg(socket, &msg);
+ if (ret < 0) {
+ goto error;
+ }
+
+error:
+ health_code_update();
+ return ret;
+}