man/sd_machine_get_class.xml

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   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
   3   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
   4
   5 <!--
   6   SPDX-License-Identifier: LGPL-2.1+
   7 -->
   8
   9 <refentry id="sd_machine_get_class" xmlns:xi="http://www.w3.org/2001/XInclude">
  10
  11   <refentryinfo>
  12     <title>sd_machine_get_class</title>
  13     <productname>systemd</productname>
  14
  15     <authorgroup>
  16       <author>
  17         <contrib>Developer</contrib>
  18         <firstname>Lennart</firstname>
  19         <surname>Poettering</surname>
  20         <email>lennart@poettering.net</email>
  21       </author>
  22     </authorgroup>
  23   </refentryinfo>
  24
  25   <refmeta>
  26     <refentrytitle>sd_machine_get_class</refentrytitle>
  27     <manvolnum>3</manvolnum>
  28   </refmeta>
  29
  30   <refnamediv>
  31     <refname>sd_machine_get_class</refname>
  32     <refname>sd_machine_get_ifindices</refname>
  33     <refpurpose>Determine the class and network interface indices of a
  34     locally running virtual machine or container.</refpurpose>
  35   </refnamediv>
  36
  37   <refsynopsisdiv>
  38     <funcsynopsis>
  39       <funcsynopsisinfo>#include &lt;systemd/sd-login.h&gt;</funcsynopsisinfo>
  40
  41       <funcprototype>
  42         <funcdef>int <function>sd_machine_get_class</function></funcdef>
  43         <paramdef>const char* <parameter>machine</parameter></paramdef>
  44         <paramdef>char **<parameter>class</parameter></paramdef>
  45       </funcprototype>
  46
  47       <funcprototype>
  48         <funcdef>int <function>sd_machine_get_ifindices</function></funcdef>
  49         <paramdef>const char* <parameter>machine</parameter></paramdef>
  50         <paramdef>int **<parameter>ifindices</parameter></paramdef>
  51       </funcprototype>
  52     </funcsynopsis>
  53   </refsynopsisdiv>
  54
  55   <refsect1>
  56     <title>Description</title>
  57
  58     <para><function>sd_machine_get_class()</function> may be used to
  59     determine the class of a locally running virtual machine or
  60     container that is registered with
  61     <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
  62     The string returned is either <literal>vm</literal> or
  63     <literal>container</literal>. The returned string needs to be
  64     freed with the libc <citerefentry
  65     project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
  66     call after use.</para>
  67
  68     <para><function>sd_machine_get_ifindices()</function> may be used
  69     to determine the numeric indices of the network interfaces on the
  70     host that are pointing towards the specified locally running
  71     virtual machine or container that is registered with
  72     <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
  73     The returned array needs to be freed with the libc <citerefentry
  74     project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
  75     call after use.</para>
  76   </refsect1>
  77
  78   <refsect1>
  79     <title>Return Value</title>
  80
  81     <para>On success, these calls return 0 or a positive integer. On
  82     failure, these calls return a negative errno-style error
  83     code.</para>
  84   </refsect1>
  85
  86   <refsect1>
  87     <title>Errors</title>
  88
  89     <para>Returned errors may indicate the following problems:</para>
  90
  91     <variablelist>
  92
  93       <varlistentry>
  94         <term><constant>-ENXIO</constant></term>
  95
  96         <listitem><para>The specified machine does not exist or is currently not running.</para>
  97         </listitem>
  98       </varlistentry>
  99
 100       <varlistentry>
 101         <term><constant>-EINVAL</constant></term>
 102
 103         <listitem><para>An input parameter was invalid (out of range,
 104         or NULL, where that is not accepted).</para></listitem>
 105       </varlistentry>
 106
 107       <varlistentry>
 108         <term><constant>-ENOMEM</constant></term>
 109
 110         <listitem><para>Memory allocation failed.</para></listitem>
 111       </varlistentry>
 112     </variablelist>
 113   </refsect1>
 114
 115   <xi:include href="libsystemd-pkgconfig.xml" />
 116
 117   <refsect1>
 118     <title>See Also</title>
 119
 120     <para>
 121       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 122       <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 123       <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 124       <citerefentry><refentrytitle>sd_pid_get_machine_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>
 125     </para>
 126   </refsect1>
 127
 128 </refentry>