<?xml version='1.0'?> <!--*-nxml-*--> <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> <!-- This file is part of systemd. Copyright 2012 Lennart Poettering Copyright 2013 Zbigniew Jędrzejewski-Szmek systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. --> <refentry id="systemd-suspend.service" xmlns:xi="http://www.w3.org/2001/XInclude"> <refentryinfo> <title>systemd-suspend.service</title> <productname>systemd</productname> <authorgroup> <author> <contrib>Developer</contrib> <firstname>Lennart</firstname> <surname>Poettering</surname> <email>lennart@poettering.net</email> </author> </authorgroup> </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-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>/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.</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>, or <literal>hybrid-sleep</literal> depending on the chosen action. 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 be notified of system suspend/hibernation and resume, there are much nicer interfaces available.</para> <para>Note that <filename>systemd-suspend.service</filename>, <filename>systemd-hibernate.service</filename>, and <filename>systemd-hybrid-sleep.service</filename> should never be executed directly. Instead, trigger system sleep states with a command such as <literal>systemctl suspend</literal> or similar.</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 <literal>[Sleep]</literal> section of <filename>/etc/systemd/sleep.conf</filename>. 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>hybrid-sleep</option></term> <listitem><para>Suspend, 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>