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<title>s6: the s6-fdholder-retrievec program</title>
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<p>
<a href="index.html">s6</a><br />
<a href="//skarnet.org/software/">Software</a><br />
<a href="//skarnet.org/">skarnet.org</a>
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<h1> The <tt>s6-fdholder-retrievec</tt> program </h1>
<p>
<tt>s6-fdholder-retrievec</tt> talks to a
<a href="s6-fdholderd.html">fd-holding daemon</a> on its open
descriptors 6 and 7, and retrieves a file descriptor from it,
then executes a program.
</p>
<h2> Interface </h2>
<pre>
s6-fdholder-retrievec [ -D ] [ -t <em>timeout</em> ] <em>id</em> <em>prog...</em>
</pre>
<ul>
<li> s6-fdholder-retrievec expects to talk to a listening
<a href="s6-fdholderd.html">s6-fdholderd</a> program on its descriptors 6 and 7. </li>
<li> It attempts to retrieve a copy of the file descriptor that has been
stored into that daemon under identifier <em>id</em>.
<li> It then executes into <em>prog...</em>, with the retrieved
file descriptor as standard input. </li>
</ul>
<h2> Options </h2>
<ul>
<li> <tt>-D</tt> : delete the file descriptor from the server's
storage after retrieval. This option requires writing rights over the
given identifier as well as reading rights: check the server's
<a href="s6-fdholderd.html#configuration">configuration</a>. </li>
<li> <tt>-t <em>timeout</em></tt> : if the operation cannot be
processed in <em>timeout</em> milliseconds, then fail with an error message.
Communications with the server should be near-instant, so this option is
only here to protect users against programming errors. </li>
</ul>
<h2> Notes </h2>
<ul>
<li>s6-fdholder-retrievec is the "internal" version of
<a href="s6-fdholder-retrieve.html">s6-fdholder-retrieve</a>. It simply
expects to be run as a UCSPI client, i.e. talking to the server
over descriptors 6 and 7, instead of connecting to the server
itself. </li>
<li> The error messages for the s6-fdholder suite are explained
<a href="s6-fdholder-errorcodes.html">here</a>. </li>
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