ment.</p>
</li>
<li>
<p>Specify &lt; 0 to have a pipe allocated; start_async() replaces
with the pipe FD in the following way:</p>
<div class="literalblock">
<div class="content">
<pre>.in: Returns the writable pipe end into which the caller
writes; the readable end of the pipe becomes the function's
in argument.</pre>
</div>
</div>
<div class="literalblock">
<div class="content">
<pre>.out: Returns the readable pipe end from which the caller
reads; the writable end of the pipe becomes the function's
out ar