+int ustctl_channel_close_wait_fd(struct ustctl_consumer_channel *consumer_chan);
+int ustctl_channel_close_wakeup_fd(struct ustctl_consumer_channel *consumer_chan);
+int ustctl_channel_get_wait_fd(struct ustctl_consumer_channel *consumer_chan);
+int ustctl_channel_get_wakeup_fd(struct ustctl_consumer_channel *consumer_chan);
+
+int ustctl_write_metadata_to_channel(
+ struct ustctl_consumer_channel *channel,
+ const char *metadata_str, /* NOT null-terminated */
+ size_t len); /* metadata length */
+