<?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">
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
-<!--
- 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/>.
--->
-
-<refentry id="sd_seat_get_active" conditional='HAVE_PAM'>
+<refentry id="sd_seat_get_active" conditional='HAVE_PAM'
+ xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>sd_seat_get_active</title>
<productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
</refentryinfo>
<refmeta>
<refnamediv>
<refname>sd_seat_get_active</refname>
<refname>sd_seat_get_sessions</refname>
- <refname>sd_seat_can_multi_session</refname>
<refname>sd_seat_can_tty</refname>
<refname>sd_seat_can_graphical</refname>
<refpurpose>Determine state of a specific seat</refpurpose>
<paramdef>unsigned int *<parameter>n_uids</parameter></paramdef>
</funcprototype>
- <funcprototype>
- <funcdef>int <function>sd_seat_can_multi_session</function></funcdef>
- <paramdef>const char *<parameter>seat</parameter></paramdef>
- </funcprototype>
-
<funcprototype>
<funcdef>int <function>sd_seat_can_tty</function></funcdef>
<paramdef>const char *<parameter>seat</parameter></paramdef>
one (<constant>NULL</constant> terminated) with the session
identifiers of the sessions and one with the user identifiers of
the Unix users the sessions belong to. An additional parameter may
- be used to return the number of entries in the latter array. The
- two arrays and the latter parameter may be passed as
+ be used to return the number of entries in the latter array. This
+ value is the same the return value, if the latter is nonnegative.
+ The two arrays and the last parameter may be passed as
<constant>NULL</constant> in case these values need not to be
determined. The arrays and the strings referenced by them need to
be freed with the libc
<constant>NULL</constant> may be returned and should be considered
equivalent to an empty array.</para>
- <para><function>sd_seat_can_multi_session()</function> may be used
- to determine whether a specific seat is capable of multi-session,
- i.e. allows multiple login sessions in parallel (with only one
- being active at a time).</para>
-
<para><function>sd_seat_can_tty()</function> may be used to
determine whether a specific seat provides TTY functionality, i.e.
is useful as a text console.</para>
<refsect1>
<title>Return Value</title>
- <para> On success, <function>sd_seat_get_active()</function>
- returns 0 or a positive integer. On success,
- <function>sd_seat_get_sessions()</function> returns the number of
- entries in the session identifier array. If the test succeeds,
- <function>sd_seat_can_multi_session</function>,
- <function>sd_seat_can_tty</function> and
- <function>sd_seat_can_graphical</function> return a positive
- integer, if it fails 0. On failure, these calls return a negative
- errno-style error code.</para>
- </refsect1>
+ <para> On success, <function>sd_seat_get_active()</function> returns 0 or a positive integer. On success,
+ <function>sd_seat_get_sessions()</function> returns the number of entries in the session identifier
+ array. If the test succeeds,
+ <function>sd_seat_can_tty</function> and <function>sd_seat_can_graphical</function> return a positive
+ integer, if it fails 0. On failure, these calls return a negative errno-style error code.</para>
- <refsect1>
- <title>Errors</title>
+ <refsect2>
+ <title>Errors</title>
- <para>Returned errors may indicate the following problems:</para>
+
<para>Returned errors may indicate the following problems:</para>
- <variablelist>
+ <variablelist>
- <varlistentry>
- <term><constant>-ENODATA</constant></term>
+ <varlistentry>
+ <term><constant>-ENODATA</constant></term>
- <listitem><para>Given field is not specified for the described
- seat.</para>
- </listitem>
- </varlistentry>
+ <listitem><para>The given field is not specified for the described seat.</para>
+ </listitem>
+ </varlistentry>
- <varlistentry>
- <term><constant>-ENXIO</constant></term>
+ <varlistentry>
+ <term><constant>-ENXIO</constant></term>
- <listitem><para>The specified seat is unknown.</para>
- </listitem>
- </varlistentry>
+
<listitem><para>The specified seat is unknown.</para>
+ </listitem>
+ </varlistentry>
- <varlistentry>
- <term><constant>-EINVAL</constant></term>
+ <varlistentry>
+ <term><constant>-EINVAL</constant></term>
- <listitem><para>An input parameter was invalid (out of range,
- or NULL, where that's not accepted).</para></listitem>
- </varlistentry>
+ <listitem><para>An input parameter was invalid (out of range, or <constant>NULL</constant>, where
+ that is not accepted).</para></listitem>
+ </varlistentry>
- <varlistentry>
- <term><constant>-ENOMEM</constant></term>
+ <varlistentry>
+ <term><constant>-ENOMEM</constant></term>
- <listitem><para>Memory allocation failed.</para></listitem>
- </varlistentry>
- </variablelist>
+ <listitem><para>Memory allocation failed.</para></listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect2>
</refsect1>
+ <xi:include href="libsystemd-pkgconfig.xml" />
+
<refsect1>
- <title>Notes</title>
-
- <para>The <function>sd_seat_get_active()</function>,
- <function>sd_seat_get_sessions()</function>,
- <function>sd_seat_can_multi_session()</function>,
- <function>sd_seat_can_tty()</function> and
- <function>sd_seat_can_grapical()</function> interfaces are
- available as a shared library, which can be compiled and linked to
- with the
- <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- file.</para>
+ <title>History</title>
+
+ <para>In the past, <function>sd_seat_can_multi_session()</function> was used to check whether the seat
+ supports multiple sessions. All seats support that now, so that function has been deprecated and always
+ returns true.</para>
</refsect1>
<refsect1>
projects / thirdparty / systemd.git / blobdiff