man/systemd-logind.service.xml

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   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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   4 <!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
   5
   6 <refentry id="systemd-logind.service" conditional='ENABLE_LOGIND'>
   7
   8   <refentryinfo>
   9     <title>systemd-logind.service</title>
  10     <productname>systemd</productname>
  11   </refentryinfo>
  12
  13   <refmeta>
  14     <refentrytitle>systemd-logind.service</refentrytitle>
  15     <manvolnum>8</manvolnum>
  16   </refmeta>
  17
  18   <refnamediv>
  19     <refname>systemd-logind.service</refname>
  20     <refname>systemd-logind</refname>
  21     <refpurpose>Login manager</refpurpose>
  22   </refnamediv>
  23
  24   <refsynopsisdiv>
  25     <para><filename>systemd-logind.service</filename></para>
  26     <para><filename>/usr/lib/systemd/systemd-logind</filename></para>
  27   </refsynopsisdiv>
  28
  29   <refsect1>
  30     <title>Description</title>
  31
  32     <para><command>systemd-logind</command> is a system service that
  33     manages user logins. It is responsible for:</para>
  34
  35     <itemizedlist>
  36       <listitem><para>Keeping track of users and sessions, their processes and their idle state. This is implemented by
  37       allocating a systemd slice unit for each user below <filename>user.slice</filename>, and a scope unit below it
  38       for each concurrent session of a user. Also, a per-user service manager is started as system service instance of
  39       <filename>user@.service</filename> for each logged in user.</para></listitem>
  40
  41       <listitem><para>Generating and managing session IDs. If auditing is available and an audit session ID is already set for
  42       a session, then this ID is reused as the session ID. Otherwise, an independent session counter is
  43       used.</para></listitem>
  44
  45       <listitem><para>Providing <ulink
  46       url="https://www.freedesktop.org/wiki/Software/polkit">polkit</ulink>-based access for users for
  47       operations such as system shutdown or sleep</para>
  48       </listitem>
  49
  50       <listitem><para>Implementing a shutdown/sleep inhibition logic for applications</para></listitem>
  51
  52       <listitem><para>Handling of power/sleep hardware keys</para></listitem>
  53
  54       <listitem><para>Multi-seat management</para></listitem>
  55
  56       <listitem><para>Session switch management</para></listitem>
  57
  58       <listitem><para>Device access management for users</para></listitem>
  59
  60       <listitem><para>Automatic spawning of text logins (gettys) on virtual console activation and user
  61       runtime directory management</para></listitem>
  62
  63       <listitem><para>Scheduled shutdown</para></listitem>
  64
  65       <listitem><para>Sending "wall" messages</para></listitem>
  66     </itemizedlist>
  67
  68     <para>User sessions are registered with logind via the
  69     <citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  70     PAM module.</para>
  71
  72     <para>See
  73     <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  74     for information about the configuration of this service.</para>
  75
  76     <para>See
  77     <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>
  78     for information about the basic concepts of logind
  79     such as users, sessions and seats.</para>
  80
  81     <para>See
  82     <citerefentry><refentrytitle>org.freedesktop.login1</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  83     and
  84     <citerefentry><refentrytitle>org.freedesktop.LogControl1</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  85     for information about the D-Bus APIs <filename>systemd-logind</filename> provides.</para>
  86
  87     <para>For more information on the inhibition logic see the <ulink
  88     url="https://www.freedesktop.org/wiki/Software/systemd/inhibit">Inhibitor
  89     Lock Developer Documentation</ulink>.</para>
  90
  91     <para>If you are interested in writing a display manager that makes use of logind, please have look at
  92     <ulink url="https://www.freedesktop.org/wiki/Software/systemd/writing-display-managers">Writing Display
  93     Managers</ulink>.
  94     If you are interested in writing a desktop environment that makes use of logind, please have look at
  95     <ulink url="https://www.freedesktop.org/wiki/Software/systemd/writing-desktop-environments">Writing
  96     Desktop Environments</ulink>.</para>
  97   </refsect1>
  98
  99   <refsect1>
 100     <title>See Also</title>
 101     <para>
 102       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 103       <citerefentry><refentrytitle>systemd-user-sessions.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 104       <citerefentry><refentrytitle>loginctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 105       <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 106       <citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 107       <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>
 108     </para>
 109   </refsect1>
 110
 111 </refentry>