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<title>s6: the s6-fdholder-listc program</title>
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<p>
<a href="index.html">s6</a><br />
<a href="http://skarnet.org/software/">Software</a><br />
<a href="http://skarnet.org/">skarnet.org</a>
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<h1> The <tt>s6-fdholder-listc</tt> program </h1>
<p>
<tt>s6-fdholder-listc</tt> talks to a
<a href="s6-fdholderd.html">fd-holding daemon</a> on its open
descriptors 6 and 7. It prints on stdout the list of identifiers
of all the fd currently held by the daemon, one per line.
</p>
<h2> Interface </h2>
<pre>
s6-fdholder-listc [ -t <em>timeout</em> ]
</pre>
<ul>
<li> s6-fdholder-listc expects to talk to a listening
<a href="s6-fdholderd.html">s6-fdholderd</a> program on its descriptors 6 and 7. </li>
<li> It gets the list of identifiers corresponding to the currently held
file descriptors. It prints that list to stdout, one per line.
<li> It then exits 0, or 1 if the server returned an error. </li>
</ul>
<h2> Options </h2>
<ul>
<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-listc is the "internal" version of
<a href="s6-fdholder-list.html">s6-fdholder-list</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>
<li> The list of identifiers is printed one per line; special
characters - such as newline - are quoted. The output can be
unquoted, for instance, by
<tt><a href="http://skarnet.org/software/s6-portable-utils/s6-unquote-filter.html">s6-unquote-filter</a>
-d ""</tt>. </li>
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