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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>