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5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
158 lines
7.3 KiB
XML
158 lines
7.3 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="sd_seat_get_active">
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<refentryinfo>
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<title>sd_seat_get_active</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_seat_get_active</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_seat_get_active</refname>
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<refname>sd_seat_get_sessions</refname>
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<refname>sd_seat_can_multi_session</refname>
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<refpurpose>Determine state of a specific seat</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_seat_get_active</function></funcdef>
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<paramdef>const char* <parameter>seat</parameter></paramdef>
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<paramdef>char** <parameter>session</parameter></paramdef>
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<paramdef>uid_t* <parameter>uid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_seat_get_sessions</function></funcdef>
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<paramdef>const char* <parameter>seat</parameter></paramdef>
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<paramdef>char*** <parameter>sessions</parameter></paramdef>
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<paramdef>uid_t** <parameter>uid</parameter></paramdef>
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<paramdef>unsigned* <parameter>n_uids</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_seat_can_multi_session</function></funcdef>
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<paramdef>const char* <parameter>seat</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_seat_get_active()</function> may be
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used to determine which session is currently active on
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a seat, if there is any. Returns the session
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identifier and the user identifier of the Unix user
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the session is belonging to. Either the session or the
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user identifier parameter can be be passed NULL, in
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case only one of the parameters shall be queried. The
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returned string needs to be freed with the libc
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<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use.</para>
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<para><function>sd_seat_get_sessions()</function> may
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be used to determine all sessions on the specified
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seat. Returns two arrays, one (NULL terminated) with
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the session identifiers of the sessions and one with
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the user identifiers of the Unix users the sessions
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belong to. An additional parameter may be used to
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return the number of entries in the latter array. The
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two arrays and the latter parameter may be passed as
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NULL in case these values need not to be
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determined. The arrays and the strings referenced by
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them need to be freed with the libc
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<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use. Note that instead of an empty array
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NULL may be returned and should be considered
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equivalent to an empty array.</para>
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<para><function>sd_seat_can_multi_session()</function>
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may be used to determine whether a specific seat is
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capable of multi-session, i.e. allows multiple login
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sessions in parallel (whith only one being active at a
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time).</para>
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<para>If the <literal>seat</literal> parameter of any
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of these functions is passed as NULL the operation is
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executed for the seat of the session of the calling
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process, if there is any.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para> On success
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<function>sd_seat_get_active()</function> return
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return 0 or a positive integer. On success
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<function>sd_seat_get_sessions()</function> returns
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the number of entries in the session identifier
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array. If the test succeeds
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<function>sd_seat_can_multi_session</function> returns
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a positive integer, if it fails 0. On failure, these
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calls return a negative errno-style error code.</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>The <function>sd_seat_get_active()</function>,
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<function>sd_seat_get_sessions()</function>, and
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<function>sd_seat_can_multi_session()</function> interfaces
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are available as shared library, which can be compiled
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and linked to with the
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<literal>libsystemd-login</literal>
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<citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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file.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_session_get_seat</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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