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+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//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 General Public License as published by
+ the Free Software Foundation; either version 2 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="sd_uid_get_state">
+
+ <refentryinfo>
+ <title>sd_uid_get_state</title>
+ <productname>systemd</productname>
+
+ <authorgroup>
+ <author>
+ <contrib>Developer</contrib>
+ <firstname>Lennart</firstname>
+ <surname>Poettering</surname>
+ <email>lennart@poettering.net</email>
+ </author>
+ </authorgroup>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_uid_get_state</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_uid_get_state</refname>
+ <refname>sd_uid_is_on_seat</refname>
+ <refname>sd_uid_get_sessions</refname>
+ <refname>sd_uid_get_seats</refname>
+ <refpurpose>Determine login state of a specific Unix user ID</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include &lt;systemd/sd-login.h&gt;</funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>int <function>sd_uid_get_state</function></funcdef>
+ <paramdef>uid_t <parameter>pid</parameter></paramdef>
+ <paramdef>char** <parameter>state</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_uid_is_on_seat</function></funcdef>
+ <paramdef>uid_t <parameter>pid</parameter></paramdef>
+ <paramdef>int <parameter>require_active</parameter></paramdef>
+ <paramdef>const char* <parameter>seat</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_uid_get_sessions</function></funcdef>
+ <paramdef>uid_t <parameter>pid</parameter></paramdef>
+ <paramdef>int <parameter>require_active</parameter></paramdef>
+ <paramdef>char*** <parameter>sessions</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_uid_get_seats</function></funcdef>
+ <paramdef>uid_t <parameter>pid</parameter></paramdef>
+ <paramdef>int <parameter>require_active</parameter></paramdef>
+ <paramdef>char*** <parameter>seats</parameter></paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><function>sd_uid_get_state()</function> may be
+ used to determine the login state of a specific Unix
+ user identifier. The following states are currently
+ known: <literal>offline</literal> (user not logged in
+ at all), <literal>lingering</literal> (user not logged
+ in, but some user services running),
+ <literal>online</literal> (user logged in, but not
+ active), <literal>active</literal> (user logged in on
+ an active seat). In the future additional states might
+ be defined, client code should be written to be robust
+ in regards to additional state strings being
+ returned. The returned string needs to be freed with
+ the libc
+ <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ call after use.</para>
+
+ <para><function>sd_uid_is_on_seat()</function> may be
+ used to determine whether a specific user is logged in
+ or active on a specific seat. Accepts a Unix user
+ identifier and a seat identifier string as
+ parameters. The <parameter>require_active</parameter>
+ parameter is a boolean. If non-zero (true) this
+ function will test if the user is active (i.e. has a
+ session that is in the foreground and accepting user
+ input) on the specified seat, otherwise (false) only
+ if the user is logged in (and possibly inactive) on
+ the specified seat.</para>
+
+ <para><function>sd_uid_get_sessions()</function> may
+ be used to determine the current sessions of the
+ specified user. Acceptes a Unix user identifier as
+ parameter. The <parameter>require_active</parameter>
+ boolean parameter controls whether the returned list
+ shall consist of only those sessions where the user is
+ currently active (true) or where the user is currently
+ logged in at all, possibly inactive (false). The call
+ returns a NULL terminated string array of session
+ identifiers in <parameter>sessions</parameter> which
+ needs to be freed by the caller with the libc
+ <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ call after use, including all the strings
+ referenced. If the string array parameter is passed as
+ NULL the array will not be filled in, but the return
+ code still indicates the number of current
+ sessions. Note that instead of an empty array NULL may
+ be returned and should be considered equivalent to an
+ empty array.</para>
+
+ <para>Similar, <function>sd_uid_get_seats()</function>
+ may be used to determine the list of seats on which
+ the user currently has sessions. Similar semantics
+ apply, however note that the user may have
+ multiple sessions on the same seat as well as sessions
+ with no attached seat and hence the number of entries
+ in the returned array may differ from the one returned
+ by <function>sd_uid_get_sessions()</function>.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para>On success
+ <function>sd_uid_get_state()</function> returns 0 or a
+ positive integer. If the test succeeds
+ <function>sd_uid_is_on_seat()</function> returns a
+ positive integer, if it fails
+ 0. <function>sd_uid_get_sessions()</function> and
+ <function>sd_uid_get_seats()</function> return the
+ number of entries in the returned arrays. On failure,
+ these calls return a negative errno-style error
+ code.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Notes</title>
+
+ <para>The <function>sd_uid_get_state()</function>,
+ <function>sd_uid_is_on_seat()</function>,
+ <function>sd_uid_get_sessions()</function>, and
+ <function>sd_uid_get_seats()</function> interfaces are
+ available as shared library, which can be compiled and
+ linked to with the <literal>libsystemd-login</literal>
+ <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ file.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_pid_get_owner_uid</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>