systemd/man/systemd-suspend.service.xml
2012-10-31 00:48:20 +01:00

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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">
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<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-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/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. 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 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/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.</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>