man/systemd-suspend.service.xml

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   8   Copyright 2012 Lennart Poettering
   9   Copyright 2013 Zbigniew Jędrzejewski-Szmek
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  24
  25 <refentry id="systemd-suspend.service"
  26           xmlns:xi="http://www.w3.org/2001/XInclude">
  27
  28         <refentryinfo>
  29                 <title>systemd-suspend.service</title>
  30                 <productname>systemd</productname>
  31
  32                 <authorgroup>
  33                         <author>
  34                                 <contrib>Developer</contrib>
  35                                 <firstname>Lennart</firstname>
  36                                 <surname>Poettering</surname>
  37                                 <email>lennart@poettering.net</email>
  38                         </author>
  39                 </authorgroup>
  40         </refentryinfo>
  41
  42         <refmeta>
  43                 <refentrytitle>systemd-suspend.service</refentrytitle>
  44                 <manvolnum>8</manvolnum>
  45         </refmeta>
  46
  47         <refnamediv>
  48                 <refname>systemd-suspend.service</refname>
  49                 <refname>systemd-hibernate.service</refname>
  50                 <refname>systemd-hybrid-sleep.service</refname>
  51                 <refname>systemd-sleep</refname>
  52                 <refpurpose>System sleep state logic</refpurpose>
  53         </refnamediv>
  54
  55         <refsynopsisdiv>
  56                 <para><filename>systemd-suspend.service</filename></para>
  57                 <para><filename>systemd-hibernate.service</filename></para>
  58                 <para><filename>systemd-hybrid-sleep.service</filename></para>
  59                 <para><filename>/usr/lib/systemd/systemd-sleep</filename></para>
  60         </refsynopsisdiv>
  61
  62         <refsect1>
  63                 <title>Description</title>
  64
  65                 <para><filename>systemd-suspend.service</filename> is
  66                 a system service that is pulled in by
  67                 <filename>suspend.target</filename> and is responsible
  68                 for the actual system suspend. Similarly,
  69                 <filename>systemd-hibernate.service</filename> is
  70                 pulled in by <filename>hibernate.target</filename> to
  71                 execute the actual hibernation. Finally,
  72                 <filename>systemd-hybrid-sleep.service</filename> is
  73                 pulled in by <filename>hybrid-sleep.target</filename>
  74                 to execute hybrid hibernation with system
  75                 suspend.</para>
  76
  77                 <para>Immediately before entering system suspend
  78                 and/or hibernation
  79                 <filename>systemd-suspend.service</filename> (and the
  80                 other mentioned units, respectively) will run all
  81                 executables in
  82                 <filename>/usr/lib/systemd/system-sleep/</filename>
  83                 and pass two arguments to them. The first argument
  84                 will be <literal>pre</literal>, the second either
  85                 <literal>suspend</literal>,
  86                 <literal>hibernate</literal>, or
  87                 <literal>hybrid-sleep</literal> depending on the
  88                 chosen action. Immediately after leaving system
  89                 suspend and/or hibernation the same executables are run,
  90                 but the first argument is now
  91                 <literal>post</literal>. All executables in this
  92                 directory are executed in parallel, and execution of
  93                 the action is not continued until all executables
  94                 have finished.</para>
  95
  96                 <para>Note that scripts or binaries dropped in
  97                 <filename>/usr/lib/systemd/system-sleep/</filename>
  98                 are intended for local use only and should be
  99                 considered hacks. If applications want to be notified
 100                 of system suspend/hibernation and resume, there are
 101                 much nicer interfaces available.</para>
 102
 103                 <para>Note that
 104                 <filename>systemd-suspend.service</filename>,
 105                 <filename>systemd-hibernate.service</filename>, and
 106                 <filename>systemd-hybrid-sleep.service</filename>
 107                 should never be executed directly. Instead, trigger
 108                 system sleep states with a command such as
 109                 <literal>systemctl suspend</literal> or
 110                 similar.</para>
 111
 112                 <para>Internally, this service will echo a string like
 113                 <literal>mem</literal> into
 114                 <filename>/sys/power/state</filename>, to trigger the
 115                 actual system suspend. What exactly is written
 116                 where can be configured in the <literal>[Sleep]</literal>
 117                 section of <filename>/etc/systemd/sleep.conf</filename>.
 118                 See <citerefentry><refentrytitle>systemd-sleep.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
 119                 </para>
 120         </refsect1>
 121
 122         <refsect1>
 123                 <title>Options</title>
 124
 125                 <para><command>systemd-sleep</command> understands the
 126                 following commands:</para>
 127
 128                 <variablelist>
 129                         <xi:include href="standard-options.xml" xpointer="help" />
 130                         <xi:include href="standard-options.xml" xpointer="version" />
 131
 132                         <varlistentry>
 133                                 <term><option>suspend</option></term>
 134                                 <term><option>hibernate</option></term>
 135                                 <term><option>hybrid-sleep</option></term>
 136
 137                                 <listitem><para>Suspend, hibernate, or
 138                                 put the system to hybrid sleep.</para>
 139                                 </listitem>
 140                         </varlistentry>
 141                 </variablelist>
 142         </refsect1>
 143
 144         <refsect1>
 145                 <title>See Also</title>
 146                 <para>
 147                         <citerefentry><refentrytitle>systemd-sleep.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 148                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 149                         <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 150                         <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 151                         <citerefentry><refentrytitle>systemd-halt.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 152                 </para>
 153         </refsect1>
 154
 155 </refentry>