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1 | <?xml version='1.0'?> <!--*-nxml-*--> | |
2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" | |
3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> | |
4 | <!-- SPDX-License-Identifier: LGPL-2.1+ --> | |
5 | ||
6 | <refentry id="systemd-logind.service" conditional='ENABLE_LOGIND'> | |
7 | ||
8 | <refentryinfo> | |
9 | <title>systemd-logind.service</title> | |
10 | <productname>systemd</productname> | |
11 | </refentryinfo> | |
12 | ||
13 | <refmeta> | |
14 | <refentrytitle>systemd-logind.service</refentrytitle> | |
15 | <manvolnum>8</manvolnum> | |
16 | </refmeta> | |
17 | ||
18 | <refnamediv> | |
19 | <refname>systemd-logind.service</refname> | |
20 | <refname>systemd-logind</refname> | |
21 | <refpurpose>Login manager</refpurpose> | |
22 | </refnamediv> | |
23 | ||
24 | <refsynopsisdiv> | |
25 | <para><filename>systemd-logind.service</filename></para> | |
26 | <para><filename>/usr/lib/systemd/systemd-logind</filename></para> | |
27 | </refsynopsisdiv> | |
28 | ||
29 | <refsect1> | |
30 | <title>Description</title> | |
31 | ||
32 | <para><command>systemd-logind</command> is a system service that | |
33 | manages user logins. It is responsible for:</para> | |
34 | ||
35 | <itemizedlist> | |
36 | <listitem><para>Keeping track of users and sessions, their processes and their idle state. This is implemented by | |
37 | allocating a systemd slice unit for each user below <filename>user.slice</filename>, and a scope unit below it | |
38 | for each concurrent session of a user. Also, a per-user service manager is started as system service instance of | |
39 | <filename>user@.service</filename> for each logged in user.</para></listitem> | |
40 | ||
41 | <listitem><para>Generating and managing session IDs. If auditing is available and an audit session ID is already set for | |
42 | a session, then this ID is reused as the session ID. Otherwise, an independent session counter is | |
43 | used.</para></listitem> | |
44 | ||
45 | <listitem><para>Providing <ulink | |
46 | url="http://www.freedesktop.org/wiki/Software/polkit">polkit</ulink>-based | |
47 | access for users for operations such as system shutdown or sleep</para> | |
48 | </listitem> | |
49 | ||
50 | <listitem><para>Implementing a shutdown/sleep inhibition logic | |
51 | for applications</para></listitem> | |
52 | ||
53 | <listitem><para>Handling of power/sleep hardware | |
54 | keys</para></listitem> | |
55 | ||
56 | <listitem><para>Multi-seat management</para></listitem> | |
57 | ||
58 | <listitem><para>Session switch management</para></listitem> | |
59 | ||
60 | <listitem><para>Device access management for | |
61 | users</para></listitem> | |
62 | ||
63 | <listitem><para>Automatic spawning of text logins (gettys) on | |
64 | virtual console activation and user runtime directory | |
65 | management</para></listitem> | |
66 | </itemizedlist> | |
67 | ||
68 | <para>User sessions are registered with logind via the | |
69 | <citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
70 | PAM module.</para> | |
71 | ||
72 | <para>See | |
73 | <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
74 | for information about the configuration of this service.</para> | |
75 | ||
76 | <para>See | |
77 | <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
78 | for information about the basic concepts of logind | |
79 | such as users, sessions and seats.</para> | |
80 | ||
81 | <para>See | |
82 | <citerefentry><refentrytitle>org.freedesktop.login1</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
83 | and | |
84 | <citerefentry><refentrytitle>org.freedesktop.LogControl1</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
85 | for information about the D-Bus APIs <filename>systemd-logind</filename> provides.</para> | |
86 | ||
87 | <para>For more information on the inhibition logic see the <ulink | |
88 | url="https://www.freedesktop.org/wiki/Software/systemd/inhibit">Inhibitor | |
89 | Lock Developer Documentation</ulink>.</para> | |
90 | ||
91 | <para>If you are interested in writing a display manager that makes use of logind, please have look at | |
92 | <ulink url="https://www.freedesktop.org/wiki/Software/systemd/writing-display-managers">Writing Display | |
93 | Managers</ulink>. | |
94 | If you are interested in writing a desktop environment that makes use of logind, please have look at | |
95 | <ulink url="http://www.freedesktop.org/wiki/Software/systemd/writing-desktop-environments">Writing | |
96 | Desktop Environments</ulink>.</para> | |
97 | </refsect1> | |
98 | ||
99 | <refsect1> | |
100 | <title>See Also</title> | |
101 | <para> | |
102 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
103 | <citerefentry><refentrytitle>systemd-user-sessions.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
104 | <citerefentry><refentrytitle>loginctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
105 | <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
106 | <citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
107 | <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
108 | </para> | |
109 | </refsect1> | |
110 | ||
111 | </refentry> |