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<?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
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">
<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-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>/usr/lib/systemd/systemd-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. Similar,
<filename>systemd-hibernate.service</filename> is
pulled in by <filename>hibernate.target</filename> to
execute the actual hibernation.</para>
<para>Immediately before entering system suspend and
hibernation
<filename>systemd-suspend.service</filename> 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>" or
"<literal>hibernate</literal>", depending on the
chosen action. Immediately after leaving system
suspend and 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 before all executables
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 and resume there are much nicer
interfaces available.</para>
<para>Note that
<filename>systemd-suspend.service</filename> and
<filename>systemd-hibernate.service</filename> should
never be executed directly. Instead, trigger system
sleep states with a command such as "<literal>systemctl
suspend</literal>" or suchlike.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<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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