<?xml version='1.0'?> <!--*-nxml-*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
<refentry id="sd-login" conditional='HAVE_PAM'
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>sd-login</title>
<productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
</refentryinfo>
<refmeta>
<listitem><para>A seat consists of all hardware devices assigned to a specific
workplace. It consists of at least one graphics device, and usually also includes
keyboard, mouse. It can also include video cameras, sound cards and more. Seats
- are identified by seat names, which are short strings (<= 64 chars), that start
- with the four characters <literal>seat</literal> followed by at least one more
+ are identified by seat names, which are strings (<= 255 characters), that start
+ with the four characters <literal>seat</literal> followed by at least one
character from the range [a-zA-Z0-9], <literal>_</literal> and
- <literal>-</literal>. They are suitable for inclusion in file names. Seat names
- may or may not be stable and may be reused if a seat becomes available again.
+ <literal>-</literal>. They are suitable for use as file names. Seat names may or
+ may not be stable and may be reused if a seat becomes available again.
</para></listitem>
</varlistentry>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
ensures that audit sessions are identical to systemd sessions, and uses the audit
- session ID as session ID in systemd (if auditing is enabled). The session
- identifier too shall be considered a short string (<= 64 chars) consisting only
- of [a-zA-Z0-9], <literal>_</literal> and <literal>-</literal>, suitable for
- inclusion in a file name. Session IDs are unique on the local machine and are
+ session ID as session ID in systemd (if auditing is enabled). In general the
+ session identifier is a short string consisting only of [a-zA-Z0-9],
+ <literal>_</literal> and <literal>-</literal>, suitable for use as a file name.
+ Session IDs are unique on the local machine and are
never reused as long as the machine is online. A user (the way we know it on UNIX)
corresponds to the person using a computer. A single user can have multiple
sessions open at the same time. A user is identified by a numeric user id (UID) or
<para>Assignment of hardware devices to seats is managed inside the udev database, via
settings on the devices:</para>
- <variablelist>
+ <variablelist class='udev-directives'>
<varlistentry>
<term>Tag <literal>seat</literal></term>
<listitem><para>When set to <literal>1</literal>, this device automatically
generates a new and independent seat, which is named after the path of the
- device. This is set for specialized USB hubs like the Plugable devices, which when
+ device. This is set for specialized USB hubs like the Pluggable devices, which when
plugged in should create a hotplug seat without further configuration.</para>
</listitem>
</varlistentry>