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   This file is part of systemd.
   9
  10   Copyright 2010 Lennart Poettering
  11 -->
  12
  13 <refentry id="systemd-logind.service" conditional='ENABLE_LOGIND'>
  14
  15   <refentryinfo>
  16     <title>systemd-logind.service</title>
  17     <productname>systemd</productname>
  18
  19     <authorgroup>
  20       <author>
  21         <contrib>Developer</contrib>
  22         <firstname>Lennart</firstname>
  23         <surname>Poettering</surname>
  24         <email>lennart@poettering.net</email>
  25       </author>
  26     </authorgroup>
  27   </refentryinfo>
  28
  29   <refmeta>
  30     <refentrytitle>systemd-logind.service</refentrytitle>
  31     <manvolnum>8</manvolnum>
  32   </refmeta>
  33
  34   <refnamediv>
  35     <refname>systemd-logind.service</refname>
  36     <refname>systemd-logind</refname>
  37     <refpurpose>Login manager</refpurpose>
  38   </refnamediv>
  39
  40   <refsynopsisdiv>
  41     <para><filename>systemd-logind.service</filename></para>
  42     <para><filename>/usr/lib/systemd/systemd-logind</filename></para>
  43   </refsynopsisdiv>
  44
  45   <refsect1>
  46     <title>Description</title>
  47
  48     <para><command>systemd-logind</command> is a system service that
  49     manages user logins. It is responsible for:</para>
  50
  51     <itemizedlist>
  52       <listitem><para>Keeping track of users and sessions, their processes and their idle state. This is implemented by
  53       allocating a systemd slice unit for each user below <filename>user.slice</filename>, and a scope unit below it
  54       for each concurrent session of a user. Also, a per-user service manager is started as system service instance of
  55       <filename>user@.service</filename> for each logged in user.</para></listitem>
  56
  57       <listitem><para>Generating and managing session IDs. If auditing is available and an audit session ID is already set for
  58       a session, then this ID is reused as the session ID. Otherwise, an independent session counter is
  59       used.</para></listitem>
  60
  61       <listitem><para>Providing PolicyKit-based access for users for
  62       operations such as system shutdown or sleep</para></listitem>
  63
  64       <listitem><para>Implementing a shutdown/sleep inhibition logic
  65       for applications</para></listitem>
  66
  67       <listitem><para>Handling of power/sleep hardware
  68       keys</para></listitem>
  69
  70       <listitem><para>Multi-seat management</para></listitem>
  71
  72       <listitem><para>Session switch management</para></listitem>
  73
  74       <listitem><para>Device access management for
  75       users</para></listitem>
  76
  77       <listitem><para>Automatic spawning of text logins (gettys) on
  78       virtual console activation and user runtime directory
  79       management</para></listitem>
  80     </itemizedlist>
  81
  82     <para>User sessions are registered with logind via the
  83     <citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  84     PAM module.</para>
  85
  86     <para>See
  87     <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  88     for information about the configuration of this service.</para>
  89
  90     <para>See
  91     <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>
  92     for information about the basic concepts of logind
  93     such as users, sessions and seats.</para>
  94
  95     <para>See the <ulink
  96     url="https://www.freedesktop.org/wiki/Software/systemd/logind">
  97     logind D-Bus API Documentation</ulink> for information about the
  98     APIs <filename>systemd-logind</filename> provides.</para>
  99
 100     <para>For more information on the inhibition logic see the <ulink
 101     url="https://www.freedesktop.org/wiki/Software/systemd/inhibit">Inhibitor
 102     Lock Developer Documentation</ulink>.</para>
 103   </refsect1>
 104
 105   <refsect1>
 106     <title>See Also</title>
 107     <para>
 108       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 109       <citerefentry><refentrytitle>systemd-user-sessions.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 110       <citerefentry><refentrytitle>loginctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 111       <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 112       <citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 113       <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>
 114     </para>
 115   </refsect1>
 116
 117 </refentry>