mirror of
https://github.com/systemd/systemd
synced 2024-07-23 03:04:57 +00:00
0c69794138
These lines are generally out-of-date, incomplete and unnecessary. With SPDX and git repository much more accurate and fine grained information about licensing and authorship is available, hence let's drop the per-file copyright notice. Of course, removing copyright lines of others is problematic, hence this commit only removes my own lines and leaves all others untouched. It might be nicer if sooner or later those could go away too, making git the only and accurate source of authorship information.
142 lines
5.6 KiB
XML
142 lines
5.6 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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SPDX-License-Identifier: LGPL-2.1+
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Copyright 2013 Zbigniew Jędrzejewski-Szmek
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-->
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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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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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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><filename>systemd-suspend.service</filename></para>
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<para><filename>systemd-hibernate.service</filename></para>
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<para><filename>systemd-hybrid-sleep.service</filename></para>
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<para><filename>systemd-suspend-then-hibernate.service</filename></para>
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<para><filename>/usr/lib/systemd/system-sleep</filename></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.
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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.</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,
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they should rather use the <ulink
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url="https://www.freedesktop.org/wiki/Software/systemd/inhibit">Inhibitor
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interface</ulink>.</para>
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<para>Note that
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<filename>systemd-suspend.service</filename>,
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<filename>systemd-hibernate.service</filename>, and
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<filename>systemd-hybrid-sleep.service</filename>
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<filename>systemd-suspend-then-hibernate.service</filename>
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should never be executed directly. Instead, trigger system sleep
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states with a command such as <literal>systemctl suspend</literal>
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or similar.</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 <literal>[Sleep]</literal> 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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</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>hybrid-sleep</option></term>
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<term><option>suspend-then-hibernate</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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</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>
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<citerefentry><refentrytitle>systemd-sleep.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-halt.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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