  <p>
      If <tt>fd-or-stream</tt> is a lisp stream, the SSL stream will
      close it automatically.  File descriptors are not closed
      automatically.  However, if <tt>close-callback</tt> is non-nil, it
      will be called with zero arguments when the SSL stream is closed.
    </p>
    <p>
      If <tt>unwrap-stream-p</tt> is true (the default), a stream for a
      file descriptor will be replaced by that file descriptor
      automatically.  This is similar to passing the result
      of <tt>stre