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
  27         <refentryinfo>
  28                 <title>systemd-suspend.service</title>
  29                 <productname>systemd</productname>
  30
  31                 <authorgroup>
  32                         <author>
  33                                 <contrib>Developer</contrib>
  34                                 <firstname>Lennart</firstname>
  35                                 <surname>Poettering</surname>
  36                                 <email>lennart@poettering.net</email>
  37                         </author>
  38                 </authorgroup>
  39         </refentryinfo>
  40
  41         <refmeta>
  42                 <refentrytitle>systemd-suspend.service</refentrytitle>
  43                 <manvolnum>8</manvolnum>
  44         </refmeta>
  45
  46         <refnamediv>
  47                 <refname>systemd-suspend.service</refname>
  48                 <refname>systemd-hibernate.service</refname>
  49                 <refname>systemd-hybrid-sleep.service</refname>
  50                 <refname>systemd-sleep</refname>
  51                 <refpurpose>System sleep state logic</refpurpose>
  52         </refnamediv>
  53
  54         <refsynopsisdiv>
  55                 <para><filename>systemd-suspend.service</filename></para>
  56                 <para><filename>systemd-hibernate.service</filename></para>
  57                 <para><filename>systemd-hybrid-sleep.service</filename></para>
  58                 <para><filename>/usr/lib/systemd/systemd-sleep</filename></para>
  59         </refsynopsisdiv>
  60
  61         <refsect1>
  62                 <title>Description</title>
  63
  64                 <para><filename>systemd-suspend.service</filename> is
  65                 a system service that is pulled in by
  66                 <filename>suspend.target</filename> and is responsible
  67                 for the actual system suspend. Similarly,
  68                 <filename>systemd-hibernate.service</filename> is
  69                 pulled in by <filename>hibernate.target</filename> to
  70                 execute the actual hibernation. Finally,
  71                 <filename>systemd-hybrid-sleep.service</filename> is
  72                 pulled in by <filename>hybrid-sleep.target</filename>
  73                 to execute hybrid hibernation with system
  74                 suspend.</para>
  75
  76                 <para>Immediately before entering system suspend
  77                 and/or hibernation
  78                 <filename>systemd-suspend.service</filename> (and the
  79                 other mentioned units, respectively) will run all
  80                 executables in
  81                 <filename>/usr/lib/systemd/system-sleep/</filename>
  82                 and pass two arguments to them. The first argument
  83                 will be "<literal>pre</literal>", the second either
  84                 "<literal>suspend</literal>",
  85                 "<literal>hibernate</literal>", or
  86                 "<literal>hybrid-sleep</literal>" depending on the
  87                 chosen action. Immediately after leaving system
  88                 suspend and/or hibernation the same executables are run,
  89                 but the first argument is now
  90                 "<literal>post</literal>". All executables in this
  91                 directory are executed in parallel, and execution of
  92                 the action is not continued until all executables
  93                 have finished.</para>
  94
  95                 <para>Note that scripts or binaries dropped in
  96                 <filename>/usr/lib/systemd/system-sleep/</filename>
  97                 are intended for local use only and should be
  98                 considered hacks. If applications want to be notified
  99                 of system suspend/hibernation and resume there are
 100                 much nicer interfaces available.</para>
 101
 102                 <para>Note that
 103                 <filename>systemd-suspend.service</filename>,
 104                 <filename>systemd-hibernate.service</filename>, and
 105                 <filename>systemd-hybrid-sleep.service</filename>
 106                 should never be executed directly. Instead, trigger
 107                 system sleep states with a command such as
 108                 "<literal>systemctl suspend</literal>" or
 109                 similar.</para>
 110
 111                 <para>Internally, this service will echo a string like
 112                 "<literal>mem</literal>" into
 113                 <filename>/sys/power/state</filename>, to trigger the
 114                 actual system suspend. What exactly is written
 115                 where can be configured in the <literal>[Sleep]</literal>
 116                 section of <filename>/etc/systemd/sleep.conf</filename>.
 117                 See <citerefentry><refentrytitle>systemd-sleep.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
 118                 </para>
 119         </refsect1>
 120
 121         <refsect1>
 122                 <title>Options</title>
 123
 124                 <para><command>systemd-sleep</command> understands the
 125                 following commands:</para>
 126
 127                 <variablelist>
 128                         <varlistentry>
 129                                 <term><option>-h</option></term>
 130                                 <term><option>--help</option></term>
 131
 132                                 <listitem><para>Print a short help
 133                                 text and exit.</para></listitem>
 134                         </varlistentry>
 135                         <varlistentry>
 136                                 <term><option>--version</option></term>
 137
 138                                 <listitem><para>Print the systemd version
 139                                 identifier and exit.</para></listitem>
 140                         </varlistentry>
 141                         <varlistentry>
 142                                 <term><option>suspend</option></term>
 143                                 <term><option>hibernate</option></term>
 144                                 <term><option>hybrid-sleep</option></term>
 145
 146                                 <listitem><para>Suspend, hibernate, or
 147                                 put the system to hybrid sleep.</para>
 148                                 </listitem>
 149                         </varlistentry>
 150                 </variablelist>
 151         </refsect1>
 152
 153         <refsect1>
 154                 <title>See Also</title>
 155                 <para>
 156                         <citerefentry><refentrytitle>systemd-sleep.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 157                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 158                         <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 159                         <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 160                         <citerefentry><refentrytitle>systemd-halt.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 161                 </para>
 162         </refsect1>
 163
 164 </refentry>