mirror of
https://github.com/systemd/systemd.git
synced 2024-12-16 21:53:40 +08:00
190 lines
9.4 KiB
XML
190 lines
9.4 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_uid_get_state" conditional='HAVE_PAM'>
|
||
|
||
<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 <systemd/sd-login.h></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 (> 0), where the user is currently
|
||
online but possibly inactive (= 0), or
|
||
logged in at all but possibly closing the session (< 0). The call returns a
|
||
<constant>NULL</constant> 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
|
||
<constant>NULL</constant>, 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 <constant>NULL</constant> may
|
||
be returned and should be considered equivalent to an
|
||
empty array.</para>
|
||
|
||
<para>Similarly, <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 a shared library, which can be compiled and
|
||
linked to with the <constant>libsystemd</constant> <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>
|