mirror of
https://github.com/systemd/systemd.git
synced 2024-11-01 09:21:26 +03:00
136 lines
5.6 KiB
XML
136 lines
5.6 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-login" conditional='HAVE_PAM'
|
|
xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
|
|
<refentryinfo>
|
|
<title>sd-login</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-login</refentrytitle>
|
|
<manvolnum>3</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>sd-login</refname>
|
|
<refpurpose>APIs for
|
|
tracking logins</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<funcsynopsis>
|
|
<funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo>
|
|
</funcsynopsis>
|
|
|
|
<cmdsynopsis>
|
|
<command>pkg-config --cflags --libs libsystemd</command>
|
|
</cmdsynopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para><filename>sd-login.h</filename> provides APIs to introspect
|
|
and monitor seat, login session and user status information on the
|
|
local system. </para>
|
|
|
|
<para>See <ulink
|
|
url="http://www.freedesktop.org/wiki/Software/systemd/multiseat">Multi-Seat
|
|
on Linux</ulink> for an introduction into multi-seat support on
|
|
Linux, the background for this set of APIs.</para>
|
|
|
|
<para>Note that these APIs only allow purely passive access and
|
|
monitoring of seats, sessions and users. To actively make changes
|
|
to the seat configuration, terminate login sessions, or switch
|
|
session on a seat you need to utilize the D-Bus API of
|
|
systemd-logind, instead.</para>
|
|
|
|
<para>These functions synchronously access data in
|
|
<filename>/proc</filename>, <filename>/sys/fs/cgroup</filename>
|
|
and <filename>/run</filename>. All of these are virtual file
|
|
systems, hence the runtime cost of the accesses is relatively
|
|
cheap.</para>
|
|
|
|
<para>It is possible (and often a very good choice) to mix calls
|
|
to the synchronous interface of <filename>sd-login.h</filename>
|
|
with the asynchronous D-Bus interface of systemd-logind. However,
|
|
if this is done you need to think a bit about possible races since
|
|
the stream of events from D-Bus and from
|
|
<filename>sd-login.h</filename> interfaces such as the login
|
|
monitor are asynchronous and not ordered against each
|
|
other.</para>
|
|
|
|
<para>If the functions return string arrays, these are generally
|
|
<constant>NULL</constant> terminated and need to be freed by the
|
|
caller with the libc
|
|
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
call after use, including the strings referenced therein.
|
|
Similarly, individual strings returned need to be freed, as
|
|
well.</para>
|
|
|
|
<para>As a special exception, instead of an empty string array
|
|
<constant>NULL</constant> may be returned, which should be treated
|
|
equivalent to an empty string array.</para>
|
|
|
|
<para>See
|
|
<citerefentry><refentrytitle>sd_pid_get_session</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_uid_get_state</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_session_is_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_seat_get_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_get_seats</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_login_monitor_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
for more information about the functions
|
|
implemented.</para>
|
|
</refsect1>
|
|
|
|
<xi:include href="libsystemd-pkgconfig.xml" />
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_pid_get_session</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_uid_get_state</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_session_is_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_seat_get_active</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_get_seats</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_login_monitor_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|