<?xml version='1.0'?> <!--*-nxml-*--> <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> <!-- SPDX-License-Identifier: LGPL-2.1+ This file is part of systemd. Copyright 2014 Lennart Poettering --> <refentry id="sd_machine_get_class"> <refentryinfo> <title>sd_machine_get_class</title> <productname>systemd</productname> <authorgroup> <author> <contrib>Developer</contrib> <firstname>Lennart</firstname> <surname>Poettering</surname> <email>lennart@poettering.net</email> </author> </authorgroup> </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 <systemd/sd-login.h></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> </refsect1> <refsect1> <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 NULL, where that is not accepted).</para></listitem> </varlistentry> <varlistentry> <term><constant>-ENOMEM</constant></term> <listitem><para>Memory allocation failed.</para></listitem> </varlistentry> </variablelist> </refsect1> <refsect1> <title>Notes</title> <para>The <function>sd_machine_get_class()</function> and <function>sd_machine_get_ifindices()</function> interfaces are available as a shared library, which can be compiled and linked to with the <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> file.</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>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, <citerefentry><refentrytitle>sd_pid_get_machine_name</refentrytitle><manvolnum>3</manvolnum></citerefentry> </para> </refsect1> </refentry>