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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
<refentry id="systemd-suspend.service"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>systemd-suspend.service</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>systemd-suspend.service</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-suspend.service</refname>
<refname>systemd-hibernate.service</refname>
<refname>systemd-hybrid-sleep.service</refname>
<refname>systemd-suspend-then-hibernate.service</refname>
<refname>systemd-sleep</refname>
<refpurpose>System sleep state logic</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>systemd-suspend.service</filename></para>
<para><filename>systemd-hibernate.service</filename></para>
<para><filename>systemd-hybrid-sleep.service</filename></para>
<para><filename>systemd-suspend-then-hibernate.service</filename></para>
<para><filename>/usr/lib/systemd/system-sleep</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><filename>systemd-suspend.service</filename> is a system
service that is pulled in by <filename>suspend.target</filename>
and is responsible for the actual system suspend. Similarly,
<filename>systemd-hibernate.service</filename> is pulled in by
<filename>hibernate.target</filename> to execute the actual
hibernation. Finally,
<filename>systemd-hybrid-sleep.service</filename> is pulled in by
<filename>hybrid-sleep.target</filename> to execute hybrid
hibernation with system suspend and pulled in by
<filename>suspend-then-hibernate.target</filename> to execute system suspend
with a timeout that will activate hibernate later.</para>
<para>Immediately before entering system suspend and/or
hibernation <filename>systemd-suspend.service</filename> (and the
other mentioned units, respectively) will run all executables in
<filename>/usr/lib/systemd/system-sleep/</filename> and pass two
arguments to them. The first argument will be
<literal>pre</literal>, the second either
<literal>suspend</literal>, <literal>hibernate</literal>,
<literal>hybrid-sleep</literal>, or <literal>suspend-then-hibernate</literal>
depending on the chosen action. An environment variable called <literal>SYSTEMD_SLEEP_ACTION</literal>
will be set and contain the sleep action that is processing. This is primarily helpful for
<literal>suspend-then-hibernate</literal> where the value of the variable will be <literal>suspend</literal>, <literal>hibernate</literal>,
or <literal>suspend-after-failed-hibernate</literal> in cases where hibernation has failed.
Immediately after leaving system suspend and/or hibernation the
same executables are run, but the first argument is now
<literal>post</literal>. All executables in this directory are
executed in parallel, and execution of the action is not continued
until all executables have finished.</para>
<para>Note that scripts or binaries dropped in
<filename>/usr/lib/systemd/system-sleep/</filename> are intended
for local use only and should be considered hacks. If applications
want to react to system suspend/hibernation and resume,
they should rather use the <ulink
url="https://www.freedesktop.org/wiki/Software/systemd/inhibit">Inhibitor
interface</ulink>.</para>
<para>Note that <filename>systemd-suspend.service</filename>,
<filename>systemd-hibernate.service</filename>, <filename>systemd-hybrid-sleep.service</filename>, and
<filename>systemd-suspend-then-hibernate.service</filename> should never be executed directly. Instead,
trigger system sleep with a command such as <command>systemctl suspend</command> or <command>systemctl
hibernate</command>.</para>
<para>Internally, this service will echo a string like
<literal>mem</literal> into <filename>/sys/power/state</filename>,
to trigger the actual system suspend. What exactly is written
where can be configured in the [Sleep] section
of <filename>/etc/systemd/sleep.conf</filename> or a
<filename>sleep.conf.d</filename> file. See
<citerefentry><refentrytitle>systemd-sleep.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
</refsect1>
<refsect1>
<title>Options</title>
<para><command>systemd-sleep</command> understands the
following commands:</para>
<variablelist>
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
<varlistentry>
<term><option>suspend</option></term>
<term><option>hibernate</option></term>
<term><option>suspend-then-hibernate</option></term>
<term><option>hybrid-sleep</option></term>
<listitem><para>Suspend, hibernate, suspend then hibernate, or put the
system to hybrid sleep.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd-sleep.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-halt.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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