ne of
text, a string containing the line of text will be returned (and from
version 0.3, if an end-of-file object is encountered without any text,
the end-of-file object is returned rather than an empty string).  The
&rsquo;loop&rsquo; argument is optional: this procedure operates on the event loop
passed in as an argument, or if none is passed (or #f is passed), on
the default event loop.
</p>
<p>A port can be made non-blocking with this:
</p>
<div class="example">
<pre class="example">(fcntl [port] F_SETF