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