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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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+ This file is part of elogind.
Copyright 2010 Lennart Poettering
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+ along with elogind; 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>
- </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 (whith only one being active at a
- time).</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> returns
- 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>, and
- <function>sd_seat_can_multi_session()</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>7</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_session_get_seat</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- </para>
- </refsect1>
+<refentry id="sd_seat_get_active" conditional='HAVE_PAM'>
+
+ <refentryinfo>
+ <title>sd_seat_get_active</title>
+ <productname>elogind</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>
+ <refname>sd_seat_can_tty</refname>
+ <refname>sd_seat_can_graphical</refname>
+ <refpurpose>Determine state of a specific seat</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include <elogind/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 int *<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 passed <constant>NULL</constant>,
+ in case only one of the parameters shall be queried. 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_seat_get_sessions()</function> may be used to
+ determine all sessions on the specified seat. Returns two arrays,
+ one (<constant>NULL</constant> 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
+ <constant>NULL</constant> 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 project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ call after use. Note that instead of an empty array
+ <constant>NULL</constant> 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 <varname>seat</varname> parameter of any of these
+ functions is passed as <constant>NULL</constant>, 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>
+ returns 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>Errors</title>
+
+ <para>Returned errors may indicate the following problems:</para>
+
+ <variablelist>
+
+ <varlistentry>
+ <term><constant>-ENODATA</constant></term>
+
+ <listitem><para>The given field is not specified for the described
+ seat.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>-ENXIO</constant></term>
+
+ <listitem><para>The specified seat is unknown.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>-EINVAL</constant></term>
+
+ <listitem><para>An input parameter was invalid (out of range,
+ or NULL, where that is 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_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_graphical()</function> interfaces are
+ available as a shared library, which can be compiled and linked to
+ with the
+ <constant>libelogind</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ file.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+
+ <para>
+ <citerefentry><refentrytitle>elogind</refentrytitle><manvolnum>8</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>
~ianmdlvl / elogind.git / blobdiff