man/systemd-logind.service.xml

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