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