* @ENOSYS: The requested functionality is not available.
* @ENOTCONN: The addressed peer is not an active connection.
* @ENOTSUPP: The feature negotiation failed, a not supported feature
* @ENOSYS: The requested functionality is not available.
* @ENOTCONN: The addressed peer is not an active connection.
* @ENOTSUPP: The feature negotiation failed, a not supported feature