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systemd-stable/man/sd_machine_get_class.xml
Zbigniew Jędrzejewski-Szmek b1de39dec8 man: make separate "Errors" sections subsection of "Return value"
Logically, this is better, because we're describing a subset of possible
return values. Visually this also looks quite good because groff renders
refsect2 much less prominently.

Also rewrap things, add <constant> in various places, fix some typos.
2019-03-21 14:53:00 +01:00

116 lines
4.2 KiB
XML

<?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+ -->
<refentry id="sd_machine_get_class" xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>sd_machine_get_class</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>sd_machine_get_class</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>sd_machine_get_class</refname>
<refname>sd_machine_get_ifindices</refname>
<refpurpose>Determine the class and network interface indices of a
locally running virtual machine or container.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcsynopsisinfo>#include &lt;systemd/sd-login.h&gt;</funcsynopsisinfo>
<funcprototype>
<funcdef>int <function>sd_machine_get_class</function></funcdef>
<paramdef>const char* <parameter>machine</parameter></paramdef>
<paramdef>char **<parameter>class</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>int <function>sd_machine_get_ifindices</function></funcdef>
<paramdef>const char* <parameter>machine</parameter></paramdef>
<paramdef>int **<parameter>ifindices</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><function>sd_machine_get_class()</function> may be used to
determine the class of a locally running virtual machine or
container that is registered with
<citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
The string returned is either <literal>vm</literal> or
<literal>container</literal>. 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_machine_get_ifindices()</function> may be used
to determine the numeric indices of the network interfaces on the
host that are pointing towards the specified locally running
virtual machine or container that is registered with
<citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
The returned array needs to be freed with the libc <citerefentry
project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
call after use.</para>
</refsect1>
<refsect1>
<title>Return Value</title>
<para>On success, these calls return 0 or a positive integer. 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>-ENXIO</constant></term>
<listitem><para>The specified machine does not exist or is currently not running.</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>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_pid_get_machine_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>