man/systemd-logind.service.xml

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   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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   5 <!--
   6   SPDX-License-Identifier: LGPL-2.1+
   7
   8   Copyright 2010 Lennart Poettering
   9 -->
  10
  11 <refentry id="systemd-logind.service" conditional='ENABLE_LOGIND'>
  12
  13   <refentryinfo>
  14     <title>systemd-logind.service</title>
  15     <productname>systemd</productname>
  16
  17     <authorgroup>
  18       <author>
  19         <contrib>Developer</contrib>
  20         <firstname>Lennart</firstname>
  21         <surname>Poettering</surname>
  22         <email>lennart@poettering.net</email>
  23       </author>
  24     </authorgroup>
  25   </refentryinfo>
  26
  27   <refmeta>
  28     <refentrytitle>systemd-logind.service</refentrytitle>
  29     <manvolnum>8</manvolnum>
  30   </refmeta>
  31
  32   <refnamediv>
  33     <refname>systemd-logind.service</refname>
  34     <refname>systemd-logind</refname>
  35     <refpurpose>Login manager</refpurpose>
  36   </refnamediv>
  37
  38   <refsynopsisdiv>
  39     <para><filename>systemd-logind.service</filename></para>
  40     <para><filename>/usr/lib/systemd/systemd-logind</filename></para>
  41   </refsynopsisdiv>
  42
  43   <refsect1>
  44     <title>Description</title>
  45
  46     <para><command>systemd-logind</command> is a system service that
  47     manages user logins. It is responsible for:</para>
  48
  49     <itemizedlist>
  50       <listitem><para>Keeping track of users and sessions, their processes and their idle state. This is implemented by
  51       allocating a systemd slice unit for each user below <filename>user.slice</filename>, and a scope unit below it
  52       for each concurrent session of a user. Also, a per-user service manager is started as system service instance of
  53       <filename>user@.service</filename> for each logged in user.</para></listitem>
  54
  55       <listitem><para>Generating and managing session IDs. If auditing is available and an audit session ID is already set for
  56       a session, then this ID is reused as the session ID. Otherwise, an independent session counter is
  57       used.</para></listitem>
  58
  59       <listitem><para>Providing PolicyKit-based access for users for
  60       operations such as system shutdown or sleep</para></listitem>
  61
  62       <listitem><para>Implementing a shutdown/sleep inhibition logic
  63       for applications</para></listitem>
  64
  65       <listitem><para>Handling of power/sleep hardware
  66       keys</para></listitem>
  67
  68       <listitem><para>Multi-seat management</para></listitem>
  69
  70       <listitem><para>Session switch management</para></listitem>
  71
  72       <listitem><para>Device access management for
  73       users</para></listitem>
  74
  75       <listitem><para>Automatic spawning of text logins (gettys) on
  76       virtual console activation and user runtime directory
  77       management</para></listitem>
  78     </itemizedlist>
  79
  80     <para>User sessions are registered with logind via the
  81     <citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  82     PAM module.</para>
  83
  84     <para>See
  85     <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  86     for information about the configuration of this service.</para>
  87
  88     <para>See
  89     <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>
  90     for information about the basic concepts of logind
  91     such as users, sessions and seats.</para>
  92
  93     <para>See the <ulink
  94     url="https://www.freedesktop.org/wiki/Software/systemd/logind">
  95     logind D-Bus API Documentation</ulink> for information about the
  96     APIs <filename>systemd-logind</filename> provides.</para>
  97
  98     <para>For more information on the inhibition logic see the <ulink
  99     url="https://www.freedesktop.org/wiki/Software/systemd/inhibit">Inhibitor
 100     Lock Developer Documentation</ulink>.</para>
 101   </refsect1>
 102
 103   <refsect1>
 104     <title>See Also</title>
 105     <para>
 106       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 107       <citerefentry><refentrytitle>systemd-user-sessions.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 108       <citerefentry><refentrytitle>loginctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 109       <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 110       <citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 111       <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>
 112     </para>
 113   </refsect1>
 114
 115 </refentry>