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11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
203 lines
7.4 KiB
XML
203 lines
7.4 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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-->
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<refentry id="sd_seat_get_active" conditional='HAVE_PAM'>
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<refentryinfo>
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<title>sd_seat_get_active</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_seat_get_active</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_seat_get_active</refname>
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<refname>sd_seat_get_sessions</refname>
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<refname>sd_seat_can_multi_session</refname>
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<refname>sd_seat_can_tty</refname>
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<refname>sd_seat_can_graphical</refname>
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<refpurpose>Determine state of a specific seat</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_seat_get_active</function></funcdef>
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<paramdef>const char *<parameter>seat</parameter></paramdef>
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<paramdef>char **<parameter>session</parameter></paramdef>
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<paramdef>uid_t *<parameter>uid</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_seat_get_sessions</function></funcdef>
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<paramdef>const char *<parameter>seat</parameter></paramdef>
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<paramdef>char ***<parameter>sessions</parameter></paramdef>
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<paramdef>uid_t **<parameter>uid</parameter></paramdef>
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<paramdef>unsigned int *<parameter>n_uids</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_seat_can_multi_session</function></funcdef>
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<paramdef>const char *<parameter>seat</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_seat_can_tty</function></funcdef>
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<paramdef>const char *<parameter>seat</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_seat_can_graphical</function></funcdef>
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<paramdef>const char *<parameter>seat</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_seat_get_active()</function> may be used to
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determine which session is currently active on a seat, if there is
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any. Returns the session identifier and the user identifier of the
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Unix user the session is belonging to. Either the session or the
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user identifier parameter can be passed <constant>NULL</constant>,
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in case only one of the parameters shall be queried. The returned
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string needs to be freed with the libc
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<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use.</para>
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<para><function>sd_seat_get_sessions()</function> may be used to
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determine all sessions on the specified seat. Returns two arrays,
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one (<constant>NULL</constant> terminated) with the session
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identifiers of the sessions and one with the user identifiers of
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the Unix users the sessions belong to. An additional parameter may
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be used to return the number of entries in the latter array. This
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value is the same the return value, if the latter is nonnegative.
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The two arrays and the last parameter may be passed as
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<constant>NULL</constant> in case these values need not to be
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determined. The arrays and the strings referenced by them need to
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be freed with the libc
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<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use. Note that instead of an empty array
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<constant>NULL</constant> may be returned and should be considered
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equivalent to an empty array.</para>
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<para><function>sd_seat_can_multi_session()</function> may be used
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to determine whether a specific seat is capable of multi-session,
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i.e. allows multiple login sessions in parallel (with only one
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being active at a time).</para>
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<para><function>sd_seat_can_tty()</function> may be used to
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determine whether a specific seat provides TTY functionality, i.e.
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is useful as a text console.</para>
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<para><function>sd_seat_can_graphical()</function> may be used to
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determine whether a specific seat provides graphics functionality,
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i.e. is useful as a graphics display.</para>
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<para>If the <varname>seat</varname> parameter of any of these
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functions is passed as <constant>NULL</constant>, the operation is
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executed for the seat of the session of the calling process, if
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there is any.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para> On success, <function>sd_seat_get_active()</function>
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returns 0 or a positive integer. On success,
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<function>sd_seat_get_sessions()</function> returns the number of
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entries in the session identifier array. If the test succeeds,
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<function>sd_seat_can_multi_session</function>,
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<function>sd_seat_can_tty</function> and
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<function>sd_seat_can_graphical</function> return a positive
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integer, if it fails 0. On failure, these calls return a negative
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errno-style error code.</para>
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</refsect1>
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<refsect1>
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<title>Errors</title>
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<para>Returned errors may indicate the following problems:</para>
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<variablelist>
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<varlistentry>
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<term><constant>-ENODATA</constant></term>
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<listitem><para>The given field is not specified for the described
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seat.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENXIO</constant></term>
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<listitem><para>The specified seat is unknown.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-EINVAL</constant></term>
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<listitem><para>An input parameter was invalid (out of range,
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or NULL, where that is not accepted).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENOMEM</constant></term>
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<listitem><para>Memory allocation failed.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>The <function>sd_seat_get_active()</function>,
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<function>sd_seat_get_sessions()</function>,
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<function>sd_seat_can_multi_session()</function>,
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<function>sd_seat_can_tty()</function> and
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<function>sd_seat_can_graphical()</function> interfaces are
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available as a shared library, which can be compiled and linked to
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with the
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<constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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file.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_session_get_seat</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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