360 lines
15 KiB
XML
360 lines
15 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_session_is_active" conditional='HAVE_PAM'>
|
||
|
||
<refentryinfo>
|
||
<title>sd_session_is_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_session_is_active</refentrytitle>
|
||
<manvolnum>3</manvolnum>
|
||
</refmeta>
|
||
|
||
<refnamediv>
|
||
<refname>sd_session_is_active</refname>
|
||
<refname>sd_session_is_remote</refname>
|
||
<refname>sd_session_get_state</refname>
|
||
<refname>sd_session_get_uid</refname>
|
||
<refname>sd_session_get_seat</refname>
|
||
<refname>sd_session_get_service</refname>
|
||
<refname>sd_session_get_type</refname>
|
||
<refname>sd_session_get_class</refname>
|
||
<refname>sd_session_get_desktop</refname>
|
||
<refname>sd_session_get_display</refname>
|
||
<refname>sd_session_get_tty</refname>
|
||
<refname>sd_session_get_vt</refname>
|
||
<refname>sd_session_get_remote_host</refname>
|
||
<refname>sd_session_get_remote_user</refname>
|
||
<refpurpose>Determine state of a specific session</refpurpose>
|
||
</refnamediv>
|
||
|
||
<refsynopsisdiv>
|
||
<funcsynopsis>
|
||
<funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_session_is_active</function></funcdef>
|
||
<paramdef>const char *<parameter>session</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_session_is_remote</function></funcdef>
|
||
<paramdef>const char *<parameter>session</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_session_get_state</function></funcdef>
|
||
<paramdef>const char *<parameter>session</parameter></paramdef>
|
||
<paramdef>char **<parameter>state</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_session_get_uid</function></funcdef>
|
||
<paramdef>const char *<parameter>session</parameter></paramdef>
|
||
<paramdef>uid_t *<parameter>uid</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_session_get_seat</function></funcdef>
|
||
<paramdef>const char *<parameter>session</parameter></paramdef>
|
||
<paramdef>char **<parameter>seat</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_session_get_service</function></funcdef>
|
||
<paramdef>const char *<parameter>session</parameter></paramdef>
|
||
<paramdef>char **<parameter>service</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_session_get_type</function></funcdef>
|
||
<paramdef>const char *<parameter>session</parameter></paramdef>
|
||
<paramdef>char **<parameter>type</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_session_get_class</function></funcdef>
|
||
<paramdef>const char *<parameter>session</parameter></paramdef>
|
||
<paramdef>char **<parameter>class</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_session_get_desktop</function></funcdef>
|
||
<paramdef>const char *<parameter>session</parameter></paramdef>
|
||
<paramdef>char **<parameter>desktop</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_session_get_display</function></funcdef>
|
||
<paramdef>const char *<parameter>session</parameter></paramdef>
|
||
<paramdef>char **<parameter>display</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_session_get_remote_host</function></funcdef>
|
||
<paramdef>const char *<parameter>session</parameter></paramdef>
|
||
<paramdef>char **<parameter>remote_host</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_session_get_remote_user</function></funcdef>
|
||
<paramdef>const char *<parameter>session</parameter></paramdef>
|
||
<paramdef>char **<parameter>remote_user</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_session_get_tty</function></funcdef>
|
||
<paramdef>const char *<parameter>session</parameter></paramdef>
|
||
<paramdef>char **<parameter>tty</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_session_get_vt</function></funcdef>
|
||
<paramdef>const char *<parameter>session</parameter></paramdef>
|
||
<paramdef>unsigned int *<parameter>vt</parameter></paramdef>
|
||
</funcprototype>
|
||
</funcsynopsis>
|
||
</refsynopsisdiv>
|
||
|
||
<refsect1>
|
||
<title>Description</title>
|
||
|
||
<para><function>sd_session_is_active()</function> may be used to
|
||
determine whether the session identified by the specified session
|
||
identifier is currently active (i.e. currently in the foreground
|
||
and available for user input) or not.</para>
|
||
|
||
<para><function>sd_session_is_remote()</function> may be used to
|
||
determine whether the session identified by the specified session
|
||
identifier is a remote session (i.e. its remote host is known) or
|
||
not.</para>
|
||
|
||
<para><function>sd_session_get_state()</function> may be used to
|
||
determine the state of the session identified by the specified
|
||
session identifier. The following states are currently known:
|
||
<literal>online</literal> (session logged in, but session not
|
||
active, i.e. not in the foreground), <literal>active</literal>
|
||
(session logged in and active, i.e. in the foreground),
|
||
<literal>closing</literal> (session nominally logged out, but some
|
||
processes belonging to it 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. This function is a more generic version of
|
||
<function>sd_session_is_active()</function>. The returned string
|
||
needs to be freed with the libc
|
||
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||
call after use.</para>
|
||
|
||
<para><function>sd_session_get_uid()</function> may be used to
|
||
determine the user identifier of the Unix user the session
|
||
identified by the specified session identifier belongs to.</para>
|
||
|
||
<para><function>sd_session_get_seat()</function> may be used to
|
||
determine the seat identifier of the seat the session identified
|
||
by the specified session identifier belongs to. Note that not all
|
||
sessions are attached to a seat, this call will fail for them. The
|
||
returned string needs to be freed with the libc
|
||
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||
call after use.</para>
|
||
|
||
<para><function>sd_session_get_service()</function> may be used to
|
||
determine the name of the service (as passed during PAM session
|
||
setup) that registered the session identified by the specified
|
||
session identifier. The returned string needs to be freed with the
|
||
libc
|
||
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||
call after use.</para>
|
||
|
||
<para><function>sd_session_get_type()</function> may be used to
|
||
determine the type of the session identified by the specified
|
||
session identifier. The returned string is one of
|
||
<literal>x11</literal>, <literal>wayland</literal>,
|
||
<literal>tty</literal>, <literal>mir</literal> or
|
||
<literal>unspecified</literal> and needs to be freed with the libc
|
||
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||
call after use.</para>
|
||
|
||
<para><function>sd_session_get_class()</function> may be used to
|
||
determine the class of the session identified by the specified
|
||
session identifier. The returned string is one of
|
||
<literal>user</literal>, <literal>greeter</literal>,
|
||
<literal>lock-screen</literal>, or <literal>background</literal>
|
||
and needs to be freed with the libc
|
||
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||
call after use.</para>
|
||
|
||
<para><function>sd_session_get_desktop()</function> may be used to
|
||
determine the brand of the desktop running on the session
|
||
identified by the specified session identifier. This field can be
|
||
set freely by desktop environments and does not follow any special
|
||
formatting. However, desktops are strongly recommended to use the
|
||
same identifiers and capitalization as for
|
||
<varname>$XDG_CURRENT_DESKTOP</varname>, as defined by the <ulink
|
||
url="http://standards.freedesktop.org/desktop-entry-spec/latest/">Desktop
|
||
Entry Specification</ulink>. The returned string needs to be freed
|
||
with the libc
|
||
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||
call after use.</para>
|
||
|
||
<para><function>sd_session_get_display()</function> may be used to
|
||
determine the X11 display of the session identified by the
|
||
specified session identifier. The returned string needs to be
|
||
freed with the libc
|
||
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||
call after use.</para>
|
||
|
||
<para><function>sd_session_get_remote_host()</function> may be
|
||
used to determine the remote hostname of the session identified by
|
||
the specified session identifier. The returned string needs to be
|
||
freed with the libc
|
||
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||
call after use.</para>
|
||
|
||
<para><function>sd_session_get_remote_user()</function> may be
|
||
used to determine the remote username of the session identified by
|
||
the specified session identifier. The returned string needs to be
|
||
freed with the libc
|
||
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||
call after use. Note that this value is rarely known to the
|
||
system, and even then should not be relied on.</para>
|
||
|
||
<para><function>sd_session_get_tty()</function> may be used to
|
||
determine the TTY device of the session identified by the
|
||
specified session identifier. The returned string needs to be
|
||
freed with the libc
|
||
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||
call after use.</para>
|
||
|
||
<para><function>sd_session_get_vt()</function> may be used to
|
||
determine the VT number of the session identified by the specified
|
||
session identifier. This function will return an error if the seat
|
||
does not support VTs.</para>
|
||
|
||
<para>If the <varname>session</varname> parameter of any of these
|
||
functions is passed as <constant>NULL</constant>, the operation is
|
||
executed for the session the calling process is a member of, if
|
||
there is any.</para>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>Return Value</title>
|
||
|
||
<para>If the test succeeds,
|
||
<function>sd_session_is_active()</function> and
|
||
<function>sd_session_is_remote()</function> return a
|
||
positive integer; if it fails, 0. On success,
|
||
<function>sd_session_get_state()</function>,
|
||
<function>sd_session_get_uid()</function>,
|
||
<function>sd_session_get_seat()</function>,
|
||
<function>sd_session_get_service()</function>,
|
||
<function>sd_session_get_type()</function>,
|
||
<function>sd_session_get_class()</function>,
|
||
<function>sd_session_get_display()</function>,
|
||
<function>sd_session_get_remote_user()</function>,
|
||
<function>sd_session_get_remote_host()</function> and
|
||
<function>sd_session_get_tty()</function> return 0 or
|
||
a positive integer. On failure, these calls return a
|
||
negative errno-style error code.</para>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>Errors</title>
|
||
|
||
<para>Returned errors may indicate the following problems:</para>
|
||
|
||
<variablelist>
|
||
|
||
<varlistentry>
|
||
<term><constant>-ENXIO</constant></term>
|
||
|
||
<listitem><para>The specified session does not exist.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><constant>-ENODATA</constant></term>
|
||
|
||
<listitem><para>The given field is not specified for the described
|
||
session.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><constant>-EINVAL</constant></term>
|
||
|
||
<listitem><para>An input parameter was invalid (out of range,
|
||
or NULL, where that's not accepted).</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><constant>-ENOMEM</constant></term>
|
||
|
||
<listitem><para>Memory allocation failed.</para></listitem>
|
||
</varlistentry>
|
||
</variablelist>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>Notes</title>
|
||
|
||
<para>The <function>sd_session_is_active()</function>,
|
||
<function>sd_session_get_state()</function>,
|
||
<function>sd_session_get_uid()</function>,
|
||
<function>sd_session_get_seat()</function>,
|
||
<function>sd_session_get_service()</function>,
|
||
<function>sd_session_get_type()</function>,
|
||
<function>sd_session_get_class()</function>,
|
||
<function>sd_session_get_display()</function>,
|
||
<function>sd_session_get_remote_host()</function>,
|
||
<function>sd_session_get_remote_user()</function> and
|
||
<function>sd_session_get_tty()</function>
|
||
interfaces are available as a shared library, which can
|
||
be compiled and linked to with the
|
||
<constant>libsystemd</constant> <citerefentry project='die-net'><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_session</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||
</para>
|
||
</refsect1>
|
||
|
||
</refentry>
|