man/sd_machine_get_class.xml

   1 <?xml version='1.0'?> <!--*-nxml-*-->
   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
   3   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
   4 <!-- SPDX-License-Identifier: LGPL-2.1+ -->
   5
   6 <refentry id="sd_machine_get_class" xmlns:xi="http://www.w3.org/2001/XInclude">
   7
   8   <refentryinfo>
   9     <title>sd_machine_get_class</title>
  10     <productname>systemd</productname>
  11   </refentryinfo>
  12
  13   <refmeta>
  14     <refentrytitle>sd_machine_get_class</refentrytitle>
  15     <manvolnum>3</manvolnum>
  16   </refmeta>
  17
  18   <refnamediv>
  19     <refname>sd_machine_get_class</refname>
  20     <refname>sd_machine_get_ifindices</refname>
  21     <refpurpose>Determine the class and network interface indices of a
  22     locally running virtual machine or container.</refpurpose>
  23   </refnamediv>
  24
  25   <refsynopsisdiv>
  26     <funcsynopsis>
  27       <funcsynopsisinfo>#include &lt;systemd/sd-login.h&gt;</funcsynopsisinfo>
  28
  29       <funcprototype>
  30         <funcdef>int <function>sd_machine_get_class</function></funcdef>
  31         <paramdef>const char* <parameter>machine</parameter></paramdef>
  32         <paramdef>char **<parameter>class</parameter></paramdef>
  33       </funcprototype>
  34
  35       <funcprototype>
  36         <funcdef>int <function>sd_machine_get_ifindices</function></funcdef>
  37         <paramdef>const char* <parameter>machine</parameter></paramdef>
  38         <paramdef>int **<parameter>ifindices</parameter></paramdef>
  39       </funcprototype>
  40     </funcsynopsis>
  41   </refsynopsisdiv>
  42
  43   <refsect1>
  44     <title>Description</title>
  45
  46     <para><function>sd_machine_get_class()</function> may be used to
  47     determine the class of a locally running virtual machine or
  48     container that is registered with
  49     <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
  50     The string returned is either <literal>vm</literal> or
  51     <literal>container</literal>. The returned string needs to be
  52     freed with the libc <citerefentry
  53     project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
  54     call after use.</para>
  55
  56     <para><function>sd_machine_get_ifindices()</function> may be used
  57     to determine the numeric indices of the network interfaces on the
  58     host that are pointing towards the specified locally running
  59     virtual machine or container that is registered with
  60     <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
  61     The returned array needs to be freed with the libc <citerefentry
  62     project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
  63     call after use.</para>
  64   </refsect1>
  65
  66   <refsect1>
  67     <title>Return Value</title>
  68
  69     <para>On success, these calls return 0 or a positive integer. On
  70     failure, these calls return a negative errno-style error
  71     code.</para>
  72   </refsect1>
  73
  74   <refsect1>
  75     <title>Errors</title>
  76
  77     <para>Returned errors may indicate the following problems:</para>
  78
  79     <variablelist>
  80
  81       <varlistentry>
  82         <term><constant>-ENXIO</constant></term>
  83
  84         <listitem><para>The specified machine does not exist or is currently not running.</para>
  85         </listitem>
  86       </varlistentry>
  87
  88       <varlistentry>
  89         <term><constant>-EINVAL</constant></term>
  90
  91         <listitem><para>An input parameter was invalid (out of range,
  92         or NULL, where that is not accepted).</para></listitem>
  93       </varlistentry>
  94
  95       <varlistentry>
  96         <term><constant>-ENOMEM</constant></term>
  97
  98         <listitem><para>Memory allocation failed.</para></listitem>
  99       </varlistentry>
 100     </variablelist>
 101   </refsect1>
 102
 103   <xi:include href="libsystemd-pkgconfig.xml" />
 104
 105   <refsect1>
 106     <title>See Also</title>
 107
 108     <para>
 109       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 110       <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
 111       <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 112       <citerefentry><refentrytitle>sd_pid_get_machine_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>
 113     </para>
 114   </refsect1>
 115
 116 </refentry>