[r6rs-discuss] Question on buffer modes

[R. Kent Dybvig]

> But there are also some other situations where it's desirable
> to be able to close the underlying standard input and standard
> output ports.  Returning a fresh port each times makes
> (close-output-port (standard-output-port)) a no-op.

You might be able to accomplish this by closing the port returned by
current-input-port or current-output-port, but whether doing so actually
closes the underlying O/S file descriptor is up to the implementation.

Kent