+
+/*
+ * Check for data availability for a given stream id.
+ *
+ * Return 0 if NOT available, 1 if so and a negative value on error.
+ */
+int relayd_data_available(struct lttcomm_sock *sock, uint64_t stream_id,
+ uint64_t last_net_seq_num)
+{
+ int ret;
+ struct lttcomm_relayd_data_available msg;
+ struct lttcomm_relayd_generic_reply reply;
+
+ /* Code flow error. Safety net. */
+ assert(sock);
+
+ DBG("Relayd data available for stream id %" PRIu64, stream_id);
+
+ msg.stream_id = htobe64(stream_id);
+ msg.last_net_seq_num = htobe64(last_net_seq_num);
+
+ /* Send command */
+ ret = send_command(sock, RELAYD_DATA_AVAILABLE, (void *) &msg,
+ sizeof(msg), 0);
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Recevie response */
+ ret = recv_reply(sock, (void *) &reply, sizeof(reply));
+ if (ret < 0) {
+ goto error;
+ }
+
+ reply.ret_code = be32toh(reply.ret_code);
+
+ /* Return session id or negative ret code. */
+ if (reply.ret_code >= LTTNG_OK) {
+ ret = -reply.ret_code;
+ ERR("Relayd data available replied error %d", ret);
+ }
+
+ /* At this point, the ret code is either 1 or 0 */
+ ret = reply.ret_code;
+
+ DBG("Relayd data is %s available for stream id %" PRIu64,
+ ret == 1 ? "" : "NOT", stream_id);
+
+error:
+ return ret;
+}
+
+/*
+ * Check on the relayd side for a quiescent state on the control socket.
+ */
+int relayd_quiescent_control(struct lttcomm_sock *sock)
+{
+ int ret;
+ struct lttcomm_relayd_generic_reply reply;
+
+ /* Code flow error. Safety net. */
+ assert(sock);
+
+ DBG("Relayd checking quiescent control state");
+
+ /* Send command */
+ ret = send_command(sock, RELAYD_QUIESCENT_CONTROL, NULL, 0, 0);
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Recevie response */
+ ret = recv_reply(sock, (void *) &reply, sizeof(reply));
+ if (ret < 0) {
+ goto error;
+ }
+
+ reply.ret_code = be32toh(reply.ret_code);
+
+ /* Return session id or negative ret code. */
+ if (reply.ret_code != LTTNG_OK) {
+ ret = -reply.ret_code;
+ ERR("Relayd quiescent control replied error %d", ret);
+ goto error;
+ }
+
+ /* Control socket is quiescent */
+ return 1;
+
+error:
+ return ret;
+}