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<title>system-shutdown-daemon</title>
<meta name="Description" content="The kernel indepentent part of the goetia shutdown procedure." />
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<h1>The system-shutdown-daemon program</h1>
<p>
system-shutdown-daemon contains the Kernel independent
part of the shutdown sequence.
It is invoked by the Kernel specifict goetia-shutdown service,
e.g.
<a href="//0x53.net/software/goetia/goetia-linux-init/service/system/goetia-shutdown.html">goetia-shutdown service for Linux</a>
or
<a href="//0x53.net/software/goetia/goetia-freebsd-init/service/system/goetia-shutdown.html">goetia-shutdown service for FreeBSD</a>.
system-shutdown-daemon is a long lived program that waits for instruction by the system-shutdown command
The latter is part of the Kernel specific packages, e.g.
<a href="//0x53.net/software/goetia/goetia-linux">goetia-linux</a>
or
<a href="//0x53.net/software/goetia/goetia-freebsd">goetia-freebsd</a>.
</p>
<h2>Interface</h2>
<pre> system-shutdown-daemon</pre>
<ul>
<li>
system-shutdown-daemon takes no arguments.
</li>
<li>
It tries to execute <code>./stage3b</code>,
which is by default not executable.
If it can not execute <code>./stage3b</code>,
and <em>only</em> in this case,
it continues with the following.
</li>
<li>
All services managed by
<a href="https://skarnet.org/software/s6-rc/">s6-rc</a>
are stopped.
This means, all services defined in
<a href="https://skarnet.org/software/s6-rc/s6-rc-compile.html#source">source directories</a>
at the <code>src</code> subdirectory of the
<a href="//0x53.net/software/goetia/confdir.html#system">system configuration directory</a>.
</li>
<li>
Next, all leftover services <em>except</em>
s6-svscan-log, goetia-shutdown and goetia-rescue, are stopped.
</li>
<li>
The file <code>stage3b</code>, expected to exist in the current working directory
is made executable.
This file is part of the Kernel secific service directories.
(see e.g. <a href="//0x53.net/software/goetia/goetia-linux-init/service/system/goetia-shutdown.html">goetia-shutdown</a>)
</li>
<li>
all uncaught system logs are copied from the
<code>log/uncaught-logs</code>
subdirectory of the
<a href="//0x53.net/software/goetia/rundir.html#system">system runtime directory</a>.
to the
<code>uncaught-logs</code>
subdirectory of the
<a href="//0x53.net/software/goetia/logdir.html#">system log directory</a>.
</li>
<li>
SIGTERM is sent to all processes but PID 1.
</li>
<li>
This also stops the system-shutdown-daemon process.
It is automatically restarted by the system supervision tree,
but this time, the file <code>./stage3b</code> is executable
and executed instead of what is described above.
What happens in <code>./stage3b</code> is Kernel specific,
and documented on
<a href="//0x53.net/software/goetia/goetia-linux-init/service/goetia-shutdown.html">goetia-shutdown service for Linux</a>,
<a href="//0x53.net/software/goetia/goetia-freebsd-init/service/goetia-shutdown.html">goetia-shutdown service for FreeBSD</a>,
etc.
</li>
</ul>
<h2>Exit codes</h2>
<ul>
<li>
Since system-shutdown-daemon is an
<a href="https://skarnet.org/software/execline/">execline</a>
script, it exits with an approximation
of employed program that failed.
</li>
<li>
system-shutdown-daemon mostly uses
<a href="https://skarnet.org/software/execline/">execline</a>
and
<a href="https://skarnet.org/software/s6/">s6</a>
software, the exit behaviour of which can be looked up on
their respective pages.
</li>
<li>
See also:
<a href="https://skarnet.org/software/execline/exitcodes.html">execline exit code handling</a>.
</li>
</ul>
<h2>Options</h2>
<ul>
<li>
There are no options to system-shutdown-daemon.
</li>
</ul>
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