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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="sd_get_seats" conditional='HAVE_PAM'
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>sd_get_seats</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_get_seats</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_get_seats</refname>
+ <refname>sd_get_sessions</refname>
+ <refname>sd_get_uids</refname>
+ <refname>sd_get_machine_names</refname>
+ <refpurpose>Determine available seats, sessions, logged in users and virtual machines/containers</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include &lt;systemd/sd-login.h&gt;</funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>int <function>sd_get_seats</function></funcdef>
+ <paramdef>char ***<parameter>seats</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_get_sessions</function></funcdef>
+ <paramdef>char ***<parameter>sessions</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_get_uids</function></funcdef>
+ <paramdef>uid_t **<parameter>users</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_get_machine_names</function></funcdef>
+ <paramdef>char ***<parameter>machines</parameter></paramdef>
+ </funcprototype>
+
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><function>sd_get_seats()</function> may be used to determine
+ all currently available local seats. Returns the number of seat
+ identifiers and if the input pointer is non-<constant>NULL</constant>, a
+ <constant>NULL</constant>-terminated array of seat identifiers
+ is stored at the address.
+ The returned array and all strings it references need to be freed
+ with the libc
+ <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ call after use. Note that instead of an empty array
+ <constant>NULL</constant> may be returned and should be considered
+ equivalent to an empty array.</para>
+
+ <para>Similarly, <function>sd_get_sessions()</function> may be
+ used to determine all current login sessions.</para>
+
+ <para>Similarly, <function>sd_get_uids()</function> may be used to
+ determine all Unix users who currently have login sessions.</para>
+
+ <para>Similarly, <function>sd_get_machine_names()</function> may
+ be used to determine all current virtual machines and containers
+ on the system.</para>
+
+ <para>Note that the returned lists are not sorted and in an
+ undefined order.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para>On success, <function>sd_get_seats()</function>, <function>sd_get_sessions()</function>,
+ <function>sd_get_uids()</function> and <function>sd_get_machine_names()</function> return the number of
+ entries in the arrays. On failure, these calls return a negative errno-style error code.</para>
+
+ <refsect2>
+ <title>Errors</title>
+
+ <para>Returned errors may indicate the following problems:</para>
+
+ <variablelist>
+
+ <varlistentry>
+ <term><constant>-ENOMEM</constant></term>
+
+ <listitem><para>Memory allocation failed.</para></listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect2>
+ </refsect1>
+
+ <xi:include href="libsystemd-pkgconfig.xml" />
+
+ <refsect1>
+ <title>See Also</title>
+
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_session_get_seat</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>