ue to a signal, then the return value is the
signal number + 128, ie. the same value that a POSIX shell&#8217;s $? would
report.  A diagnostic is printed.</p>
<div class="dlist">
<dl>
<dt class="hdlist1"><code>start_async</code></dt>
<dd>
<p>Run a function asynchronously. Takes a pointer to a <code>struct
async</code> that specifies the details and returns a set of pipe FDs
for communication with the function. See below for details.</p>
</dd>
<dt class="hdlist1"><code>finish_async</code></dt>
<dd>
<p>Wait f