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<title>s6: the s6-fdholder-list program</title>
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<p>
<a href="index.html">s6</a><br />
<a href="//skarnet.org/software/">Software</a><br />
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<h1> The <tt>s6-fdholder-list</tt> program </h1>
<p>
<tt>s6-fdholder-list</tt> lists the descriptors currently held by a
<a href="s6-fdholderd.html">fd-holding daemon</a>.
</p>
<h2> Interface </h2>
<pre>
s6-fdholder-list [ -t <em>timeout</em> ] <em>path</em>
</pre>
<ul>
<li> <tt>s6-fdholder-list</tt> connects to a
<a href="s6-fdholderd.html">s6-fdholderd</a> server process listening on
<em>path</em>. </li>
<li> It gets the list of identifiers corresponding to the currently held
file descriptors. It prints this list to stdout, one per line. </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 (connecting to the
wrong socket, for instance). </li>
</ul>
<h2> Exit codes </h2>
<ul>
<li> 0: success. </li>
<li> 1: the server denied the operation. The meaning of the error messages
is explained <a href="s6-fdholder-errorcodes.html">here</a>. </li>
<li> 100: wrong usage. </li>
<li> 111: system call failed - this includes attempting to connect to a
nonexistent socket, or one where no <a href="s6-fdholderd.html">s6-fdholderd</a>
daemon is listening. </li>
</ul>
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