mirror of
https://github.com/AuxXxilium/eudev.git
synced 2024-12-22 23:36:40 +07:00
181 lines
8.5 KiB
XML
181 lines
8.5 KiB
XML
<?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_seat_get_active">
|
|
|
|
<refentryinfo>
|
|
<title>sd_seat_get_active</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_seat_get_active</refentrytitle>
|
|
<manvolnum>3</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>sd_seat_get_active</refname>
|
|
<refname>sd_seat_get_sessions</refname>
|
|
<refname>sd_seat_can_multi_session</refname>
|
|
<refpurpose>Determine state of a specific seat</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<funcsynopsis>
|
|
<funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_seat_get_active</function></funcdef>
|
|
<paramdef>const char* <parameter>seat</parameter></paramdef>
|
|
<paramdef>char** <parameter>session</parameter></paramdef>
|
|
<paramdef>uid_t* <parameter>uid</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_seat_get_sessions</function></funcdef>
|
|
<paramdef>const char* <parameter>seat</parameter></paramdef>
|
|
<paramdef>char*** <parameter>sessions</parameter></paramdef>
|
|
<paramdef>uid_t** <parameter>uid</parameter></paramdef>
|
|
<paramdef>unsigned* <parameter>n_uids</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_seat_can_multi_session</function></funcdef>
|
|
<paramdef>const char* <parameter>seat</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_seat_can_tty</function></funcdef>
|
|
<paramdef>const char* <parameter>seat</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_seat_can_graphical</function></funcdef>
|
|
<paramdef>const char* <parameter>seat</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para><function>sd_seat_get_active()</function> may be
|
|
used to determine which session is currently active on
|
|
a seat, if there is any. Returns the session
|
|
identifier and the user identifier of the Unix user
|
|
the session is belonging to. Either the session or the
|
|
user identifier parameter can be be passed NULL, in
|
|
case only one of the parameters shall be queried. 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_seat_get_sessions()</function> may
|
|
be used to determine all sessions on the specified
|
|
seat. Returns two arrays, one (NULL terminated) with
|
|
the session identifiers of the sessions and one with
|
|
the user identifiers of the Unix users the sessions
|
|
belong to. An additional parameter may be used to
|
|
return the number of entries in the latter array. The
|
|
two arrays and the latter parameter may be passed as
|
|
NULL in case these values need not to be
|
|
determined. The arrays and the strings referenced by
|
|
them need to be freed with the libc
|
|
<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
call after use. Note that instead of an empty array
|
|
NULL may be returned and should be considered
|
|
equivalent to an empty array.</para>
|
|
|
|
<para><function>sd_seat_can_multi_session()</function>
|
|
may be used to determine whether a specific seat is
|
|
capable of multi-session, i.e. allows multiple login
|
|
sessions in parallel (with only one being active at a
|
|
time).</para>
|
|
|
|
<para><function>sd_seat_can_tty()</function> may be
|
|
used to determine whether a specific seat provides TTY
|
|
functionality, i.e. is useful as a text console.</para>
|
|
|
|
<para><function>sd_seat_can_graphical()</function> may
|
|
be used to determine whether a specific seat provides
|
|
graphics functionality, i.e. is useful as a graphics
|
|
display.</para>
|
|
|
|
<para>If the <literal>seat</literal> parameter of any
|
|
of these functions is passed as NULL the operation is
|
|
executed for the seat of the session of the calling
|
|
process, if there is any.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Return Value</title>
|
|
|
|
<para> On success
|
|
<function>sd_seat_get_active()</function> return
|
|
return 0 or a positive integer. On success
|
|
<function>sd_seat_get_sessions()</function> returns
|
|
the number of entries in the session identifier
|
|
array. If the test succeeds
|
|
<function>sd_seat_can_multi_session</function>,
|
|
<function>sd_seat_can_tty</function> and
|
|
<function>sd_seat_can_graphical</function> return a
|
|
positive integer, if it fails 0. On failure, these
|
|
calls return a negative errno-style error code.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Notes</title>
|
|
|
|
<para>The <function>sd_seat_get_active()</function>,
|
|
<function>sd_seat_get_sessions()</function>,
|
|
<function>sd_seat_can_multi_session()</function>,
|
|
<function>sd_seat_can_tty()</function> and
|
|
<function>sd_seat_can_grapical()</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_session_get_seat</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|