">
<div class="content">
<pre>The specified FD is closed by start_async(), even if it fails to
run the function.</pre>
</div>
</div>
</li>
</ol>
</div>
<div class="paragraph">
<p>The function pointer in .proc has the following signature:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>int proc(int in, int out, void *data);</pre>
</div>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>in, out specifies a set of file descriptors to which the function
must read/write the data that