mirror of
https://github.com/systemd/systemd.git
synced 2024-12-23 21:35:11 +03:00
119 lines
4.1 KiB
XML
119 lines
4.1 KiB
XML
<?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 <systemd/sd-login.h></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>
|