Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 161 insertions, 0 deletions

diff --git a/man/sd_seat_get_active.xml b/man/sd_seat_get_active.xml
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+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="sd_seat_get_active" conditional='HAVE_PAM'
+          xmlns:xi="http://www.w3.org/2001/XInclude">
+
+  <refentryinfo>
+    <title>sd_seat_get_active</title>
+    <productname>systemd</productname>
+  </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_tty</refname>
+    <refname>sd_seat_can_graphical</refname>
+    <refpurpose>Determine state of a specific seat</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcsynopsisinfo>#include &lt;systemd/sd-login.h&gt;</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>ret_sessions</parameter></paramdef>
+        <paramdef>uid_t **<parameter>ret_uids</parameter></paramdef>
+        <paramdef>unsigned int *<parameter>ret_n_uids</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. This value is the same as the
+    return value if the return value is nonnegative. The output parameters may be passed as
+    <constant>NULL</constant> in case these output values are not needed. 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_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_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>
+
+    <refsect2>
+      <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 <constant>NULL</constant>, where
+          that is not accepted).</para></listitem>
+        </varlistentry>
+
+        <varlistentry>
+          <term><constant>-ENOMEM</constant></term>
+
+          <listitem><para>Memory allocation failed.</para></listitem>
+        </varlistentry>
+      </variablelist>
+    </refsect2>
+  </refsect1>
+
+  <xi:include href="libsystemd-pkgconfig.xml" />
+
+  <refsect1>
+    <title>History</title>
+
+    <para><function>sd_seat_can_tty()</function> and
+    <function>sd_seat_can_graphical()</function> were added in version 186.</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_session_get_seat</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>