man/systemd-logind.service.xml

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   8   Copyright 2010 Lennart Poettering
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  23
  24 <refentry id="systemd-logind.service" conditional='ENABLE_LOGIND'>
  25
  26   <refentryinfo>
  27     <title>systemd-logind.service</title>
  28     <productname>systemd</productname>
  29
  30     <authorgroup>
  31       <author>
  32         <contrib>Developer</contrib>
  33         <firstname>Lennart</firstname>
  34         <surname>Poettering</surname>
  35         <email>lennart@poettering.net</email>
  36       </author>
  37     </authorgroup>
  38   </refentryinfo>
  39
  40   <refmeta>
  41     <refentrytitle>systemd-logind.service</refentrytitle>
  42     <manvolnum>8</manvolnum>
  43   </refmeta>
  44
  45   <refnamediv>
  46     <refname>systemd-logind.service</refname>
  47     <refname>systemd-logind</refname>
  48     <refpurpose>Login manager</refpurpose>
  49   </refnamediv>
  50
  51   <refsynopsisdiv>
  52     <para><filename>systemd-logind.service</filename></para>
  53     <para><filename>/usr/lib/systemd/systemd-logind</filename></para>
  54   </refsynopsisdiv>
  55
  56   <refsect1>
  57     <title>Description</title>
  58
  59     <para><command>systemd-logind</command> is a system service that
  60     manages user logins. It is responsible for:</para>
  61
  62     <itemizedlist>
  63       <listitem><para>Keeping track of users and sessions, their processes and their idle state. This is implemented by
  64       allocating a systemd slice unit for each user below <filename>user.slice</filename>, and a scope unit below it
  65       for each concurrent session of a user. Also, a per-user service manager is started as system service instance of
  66       <filename>user@.service</filename> for each logged in user.</para></listitem>
  67
  68       <listitem><para>Generating and managing session IDs. If auditing is available and an audit session ID is already set for
  69       a session, then this ID is reused as the session ID. Otherwise, an independent session counter is
  70       used.</para></listitem>
  71
  72       <listitem><para>Providing PolicyKit-based access for users for
  73       operations such as system shutdown or sleep</para></listitem>
  74
  75       <listitem><para>Implementing a shutdown/sleep inhibition logic
  76       for applications</para></listitem>
  77
  78       <listitem><para>Handling of power/sleep hardware
  79       keys</para></listitem>
  80
  81       <listitem><para>Multi-seat management</para></listitem>
  82
  83       <listitem><para>Session switch management</para></listitem>
  84
  85       <listitem><para>Device access management for
  86       users</para></listitem>
  87
  88       <listitem><para>Automatic spawning of text logins (gettys) on
  89       virtual console activation and user runtime directory
  90       management</para></listitem>
  91     </itemizedlist>
  92
  93     <para>User sessions are registered with logind via the
  94     <citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  95     PAM module.</para>
  96
  97     <para>See
  98     <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  99     for information about the configuration of this service.</para>
 100
 101     <para>See <ulink
 102     url="https://www.freedesktop.org/wiki/Software/systemd/multiseat">Multi-Seat
 103     on Linux</ulink> for an introduction into basic concepts of logind
 104     such as users, sessions and seats.</para>
 105
 106     <para>See the <ulink
 107     url="https://www.freedesktop.org/wiki/Software/systemd/logind">
 108     logind D-Bus API Documentation</ulink> for information about the
 109     APIs <filename>systemd-logind</filename> provides.</para>
 110
 111     <para>For more information on the inhibition logic see the <ulink
 112     url="https://www.freedesktop.org/wiki/Software/systemd/inhibit">Inhibitor
 113     Lock Developer Documentation</ulink>.</para>
 114   </refsect1>
 115
 116   <refsect1>
 117     <title>See Also</title>
 118     <para>
 119       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 120       <citerefentry><refentrytitle>systemd-user-sessions.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 121       <citerefentry><refentrytitle>loginctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 122       <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 123       <citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 124     </para>
 125   </refsect1>
 126
 127 </refentry>