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<h4 class="subsection">16.3.3 Function Parameters</h4>
<p>The calling convention is modelled after that of CMUCL's <code>UNIX</code>
package: in particular, it's like the C interface except that:
<ol type=a start=1>
<li>Length arguments are omitted or optional where the sensible value
is obvious. For example, <code>read</code> would be defined this way:
<pre class="lisp"> (read fd buffer &optional (length (length buffer))) => bytes-read
</pre>
<li>Where C simulates “out” parameters using pointers (for instance, in
<code>pipe()</code> or <code>socketpair()</code>) these may be optional or omitted
in the Lisp interface: if not provided, appropriate objects will be
allocated and returned (using multiple return values if necessary).
<li>Some functions accept objects such as filenames or file descriptors.
Wherever these are specified as such in the C bindings, the Lisp
interface accepts designators for them as specified in the 'Types'
section above.
<li>A few functions have been included in sb-posix that do not correspond
exactly with their C counterparts. These are described in
See <a href="Functions-with-idiosyncratic-bindings.html#Functions-with-idiosyncratic-bindings">Functions with idiosyncratic bindings</a>.
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