mirror of
https://github.com/systemd/systemd
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137 lines
6.6 KiB
XML
137 lines
6.6 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-suspend.service"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-suspend.service</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-suspend.service</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-suspend.service</refname>
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<refname>systemd-hibernate.service</refname>
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<refname>systemd-hybrid-sleep.service</refname>
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<refname>systemd-suspend-then-hibernate.service</refname>
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<refname>systemd-sleep</refname>
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<refpurpose>System sleep state logic</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><simplelist>
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<member><filename>systemd-suspend.service</filename></member>
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<member><filename>systemd-hibernate.service</filename></member>
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<member><filename>systemd-hybrid-sleep.service</filename></member>
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<member><filename>systemd-suspend-then-hibernate.service</filename></member>
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<member><filename>/usr/lib/systemd/system-sleep</filename></member>
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</simplelist></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>systemd-suspend.service</filename> is a system
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service that is pulled in by <filename>suspend.target</filename>
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and is responsible for the actual system suspend. Similarly,
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<filename>systemd-hibernate.service</filename> is pulled in by
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<filename>hibernate.target</filename> to execute the actual
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hibernation. Finally,
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<filename>systemd-hybrid-sleep.service</filename> is pulled in by
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<filename>hybrid-sleep.target</filename> to execute hybrid
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hibernation with system suspend and pulled in by
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<filename>suspend-then-hibernate.target</filename> to execute system suspend
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with a timeout that will activate hibernate later.</para>
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<para>Immediately before entering system suspend and/or
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hibernation <filename>systemd-suspend.service</filename> (and the
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other mentioned units, respectively) will run all executables in
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<filename>/usr/lib/systemd/system-sleep/</filename> and pass two
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arguments to them. The first argument will be
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<literal>pre</literal>, the second either
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<literal>suspend</literal>, <literal>hibernate</literal>,
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<literal>hybrid-sleep</literal>, or <literal>suspend-then-hibernate</literal>
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depending on the chosen action. An environment variable called <literal>SYSTEMD_SLEEP_ACTION</literal>
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will be set and contain the sleep action that is processing. This is primarily helpful for
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<literal>suspend-then-hibernate</literal> where the value of the variable will be <literal>suspend</literal>, <literal>hibernate</literal>,
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or <literal>suspend-after-failed-hibernate</literal> in cases where hibernation has failed.
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Immediately after leaving system suspend and/or hibernation the
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same executables are run, but the first argument is now
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<literal>post</literal>. All executables in this directory are
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executed in parallel, and execution of the action is not continued
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until all executables have finished. Note that <filename>user.slice</filename> will
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be frozen while the executables are running, so they should not attempt to
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communicate with any user services expecting a reply.</para>
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<para>Note that scripts or binaries dropped in
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<filename>/usr/lib/systemd/system-sleep/</filename> are intended
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for local use only and should be considered hacks. If applications
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want to react to system suspend/hibernation and resume, they should rather use the
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<ulink url="https://systemd.io/INHIBITOR_LOCKS">Inhibitor Locks</ulink>.</para>
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<para>Note that <filename>systemd-suspend.service</filename>,
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<filename>systemd-hibernate.service</filename>, <filename>systemd-hybrid-sleep.service</filename>, and
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<filename>systemd-suspend-then-hibernate.service</filename> should never be executed directly. Instead,
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trigger system sleep with a command such as <command>systemctl suspend</command> or <command>systemctl
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hibernate</command>.</para>
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<para>Internally, this service will echo a string like
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<literal>mem</literal> into <filename>/sys/power/state</filename>,
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to trigger the actual system suspend. What exactly is written
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where can be configured in the [Sleep] section
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of <filename>/etc/systemd/sleep.conf</filename> or a
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<filename>sleep.conf.d</filename> file. See
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<citerefentry><refentrytitle>systemd-sleep.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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<para>Note that by default these services freeze <filename>user.slice</filename> while they run. This prevents
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the execution of any process in any of the user sessions while the system is entering into and resuming from
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sleep. Thus, this prevents the hooks in <filename>/usr/lib/systemd/system-sleep/</filename>, or any other process
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for that matter, from communicating with any user session process during sleep.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para><command>systemd-sleep</command> understands the
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following commands:</para>
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<variablelist>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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<varlistentry>
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<term><option>suspend</option></term>
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<term><option>hibernate</option></term>
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<term><option>suspend-then-hibernate</option></term>
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<term><option>hybrid-sleep</option></term>
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<listitem><para>Suspend, hibernate, suspend then hibernate, or put the
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system to hybrid sleep.</para>
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<xi:include href="version-info.xml" xpointer="v203"/>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd-sleep.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd-halt.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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