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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 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_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>uid</parameter></paramdef>
- <paramdef>char** <parameter>state</parameter></paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>int <function>sd_uid_is_on_seat</function></funcdef>
- <paramdef>uid_t <parameter>uid</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>uid</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>uid</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, i.e. has no session in the foreground),
- <literal>active</literal> (user logged in, and has at
- least one active session, i.e. one session in the
- foreground), <literal>closing</literal> (user not
- logged in, and not lingering, but some processes are
- still around). 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 value. 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. Accepts a Unix user identifier as
- parameter. The <parameter>require_active</parameter>
- parameter controls whether the returned list shall
- consist of only those sessions where the user is
- currently active (&gt; 0), where the user is currently
- online but possibly inactive (= 0), or
- logged in at all but possibly closing the session (&lt; 0). 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>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_pid_get_owner_uid</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>