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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
<refentry id="systemd-logind.service" conditional='ENABLE_LOGIND'>
<refentryinfo>
<title>systemd-logind.service</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>systemd-logind.service</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-logind.service</refname>
<refname>systemd-logind</refname>
<refpurpose>Login manager</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>systemd-logind.service</filename></para>
<para><filename>/usr/lib/systemd/systemd-logind</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><command>systemd-logind</command> is a system service that
manages user logins. It is responsible for:</para>
<itemizedlist>
<listitem><para>Keeping track of users and sessions, their processes and their idle state. This is implemented by
allocating a systemd slice unit for each user below <filename>user.slice</filename>, and a scope unit below it
for each concurrent session of a user. Also, a per-user service manager is started as system service instance of
<filename>user@.service</filename> for each logged in user.</para></listitem>
<listitem><para>Generating and managing session IDs. If auditing is available and an audit session ID is already set for
a session, then this ID is reused as the session ID. Otherwise, an independent session counter is
used.</para></listitem>
<listitem><para>Providing <ulink
url="https://www.freedesktop.org/wiki/Software/polkit">polkit</ulink>-based access for users for
operations such as system shutdown or sleep</para>
</listitem>
<listitem><para>Implementing a shutdown/sleep inhibition logic for applications</para></listitem>
<listitem><para>Handling of power/sleep hardware keys</para></listitem>
<listitem><para>Multi-seat management</para></listitem>
<listitem><para>Session switch management</para></listitem>
<listitem><para>Device access management for users</para></listitem>
<listitem><para>Automatic spawning of text logins (gettys) on virtual console activation and user
runtime directory management</para></listitem>
<listitem><para>Scheduled shutdown</para></listitem>
<listitem><para>Sending "wall" messages</para></listitem>
</itemizedlist>
<para>User sessions are registered with logind via the
<citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
PAM module.</para>
<para>See
<citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for information about the configuration of this service.</para>
<para>See
<citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>
for information about the basic concepts of logind
such as users, sessions and seats.</para>
<para>See
<citerefentry><refentrytitle>org.freedesktop.login1</refentrytitle><manvolnum>5</manvolnum></citerefentry>
and
<citerefentry><refentrytitle>org.freedesktop.LogControl1</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for information about the D-Bus APIs <filename>systemd-logind</filename> provides.</para>
<para>For more information on the inhibition logic see the <ulink
url="https://www.freedesktop.org/wiki/Software/systemd/inhibit">Inhibitor
Lock Developer Documentation</ulink>.</para>
<para>If you are interested in writing a display manager that makes use of logind, please have look at
<ulink url="https://www.freedesktop.org/wiki/Software/systemd/writing-display-managers">Writing Display
Managers</ulink>.
If you are interested in writing a desktop environment that makes use of logind, please have look at
<ulink url="https://www.freedesktop.org/wiki/Software/systemd/writing-desktop-environments">Writing
Desktop Environments</ulink>.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-user-sessions.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>loginctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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