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123 lines
4.6 KiB
XML
123 lines
4.6 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="sd_machine_get_class" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_machine_get_class</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_machine_get_class</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_machine_get_class</refname>
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<refname>sd_machine_get_ifindices</refname>
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<refpurpose>Determine the class and network interface indices of a
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locally running virtual machine or container</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-login.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_machine_get_class</function></funcdef>
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<paramdef>const char* <parameter>machine</parameter></paramdef>
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<paramdef>char **<parameter>class</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_machine_get_ifindices</function></funcdef>
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<paramdef>const char* <parameter>machine</parameter></paramdef>
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<paramdef>int **<parameter>ret_ifindices</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_machine_get_class()</function> may be used to
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determine the class of a locally running virtual machine or
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container that is registered with
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<citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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The string returned is either <literal>vm</literal> or
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<literal>container</literal>. The returned string needs to be
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freed with the libc <citerefentry
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project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use.</para>
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<para><function>sd_machine_get_ifindices()</function> may be used to determine the numeric indices of the
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network interfaces on the host that are pointing towards the specified locally running virtual machine or
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container. The vm or container must be registered with
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<citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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The output parameter <parameter>ret_ifindices</parameter> may be passed as <constant>NULL</constant> when
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the output value is not needed. The returned array needs to be freed with the libc <citerefentry
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project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> call after
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use.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>On success, these functions return a non-negative integer.
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<function>sd_machine_get_ifindices()</function> returns the number of the relevant network interfaces.
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On failure, these calls return a negative errno-style error code.</para>
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<refsect2>
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<title>Errors</title>
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<para>Returned errors may indicate the following problems:</para>
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<variablelist>
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<varlistentry>
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<term><constant>-ENXIO</constant></term>
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<listitem><para>The specified machine does not exist or is currently not running.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-EINVAL</constant></term>
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<listitem><para>An input parameter was invalid (out of range, or <constant>NULL</constant>, where
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that is not accepted).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENOMEM</constant></term>
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<listitem><para>Memory allocation failed.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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</refsect1>
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<xi:include href="libsystemd-pkgconfig.xml" />
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<refsect1>
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<title>History</title>
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<para><function>sd_machine_get_class()</function> and
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<function>sd_machine_get_ifindices()</function> were added in version 217.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_pid_get_machine_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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