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<title>s6-linux-init: the s6-linux-init-shutdownd internal program</title>
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<p>
<a href="index.html">s6-linux-init</a><br />
<a href="//skarnet.org/software/">Software</a><br />
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<h1> The <tt>s6-linux-init-shutdownd</tt> internal program </h1>
<p>
<tt>s6-linux-init-shutdownd</tt> is the daemon that manages the shutdown
procedure for a s6-linux-init installation. It is not meant to be called
directly by the user.
</p>
<h2> Interface </h2>
<pre>
s6-linux-init-shutdownd [ -b <em>bindir</em> ] [ -c <em>basedir</em> ] [ -g <em>gracetime</em> ] <em>fifo</em>
</pre>
<ul>
<li> <tt>s6-linux-init-shutdownd</tt> opens the <em>fifo</em> named pipe
and listens to it. This is where programs such as
<a href="s6-linux-init-shutdown.html">s6-linux-init-shutdown</a> send their
commands when they are told to trigger the shutdown procedure.</li>
<li> When it receives a command to shut down, <tt>s6-linux-init-shutdownd</tt>
first spawns the <em>stage3</em> script defined by the last
<a href="s6-linux-init-maker.html">s6-linux-init-maker</a> invocation. </li>
<li> When this script exits, <tt>s6-linux-init-shutdownd</tt> kills all
processes, first with a SIGTERM, then (after the grace time specified by
the shutdown command) with a SIGKILL. </li>
<li> It then runs the automatically-generated <em>stage 4</em> script,
which unmounts the file systems and halts, powers off or reboots the
machine. </li>
</ul>
<h2> Exit codes </h2>
<ul>
<li> 100: wrong usage, or user does not have root privileges. </li>
<li> 111: system call failed. </li>
</ul>
<h2> Options </h2>
<ul>
<li> <tt>-b <em>bindir</em></tt> : look for the
<a href="//skarnet.org/software/execline/execlineb.html">execlineb</a>
script interpreter in the <em>bindir</em> directory. Default is <tt>/bin</tt>. </li>
<li> <tt>-c <em>basedir</em></tt> : look for the
<em>stage3</em> and <em>stage4</em> scripts in the <em>basedir</em>
directory. Default is <tt>/etc/s6-linux-init</tt>. </li>
<li> <tt>-g <em>gracetime</em></tt> : if the shutdown command
does not specify a grace time between the SIGTERM and the SIGKILL, use
<em>gracetime</em> milliseconds. Default is 3000. </li>
</ul>
<h2> Notes </h2>
<ul>
<li> The <a href="s6-linux-init-shutdownd.html">s6-linux-init-shutdownd</a>
binary is not meant to be called directly by administrators. It is run
by a <a href="//skarnet.org/software/s6/">s6</a> service that is automatically
generated by
<a href="s6-linux-init-maker.html">s6-linux-init-maker</a>. </li>
</ul>
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