<?xml version='1.0'?> <!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-or-later --> <refentry id="sd_bus_get_name_machine_id" xmlns:xi="http://www.w3.org/2001/XInclude"> <refentryinfo> <title>sd_bus_get_name_machine_id</title> <productname>systemd</productname> </refentryinfo> <refmeta> <refentrytitle>sd_bus_get_name_machine_id</refentrytitle> <manvolnum>3</manvolnum> </refmeta> <refnamediv> <refname>sd_bus_get_name_machine_id</refname> <refpurpose>Retrieve a bus client's machine identity</refpurpose> </refnamediv> <refsynopsisdiv> <funcsynopsis> <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo> <funcprototype> <funcdef>int <function>sd_bus_get_name_machine_id</function></funcdef> <paramdef>sd_bus *<parameter>bus</parameter></paramdef> <paramdef>const char *<parameter>name</parameter></paramdef> <paramdef>sd_id128_t *<parameter>machine</parameter></paramdef> </funcprototype> </funcsynopsis> </refsynopsisdiv> <refsect1> <title>Description</title> <para><function>sd_bus_get_name_machine_id()</function> retrieves the D-Bus machine identity of the machine that the bus client identified by <parameter>name</parameter> is running on. Internally, it calls the <function>GetMachineId</function> method of the <constant>org.freedesktop.DBus.Peer</constant> interface. The D-Bus machine identity is a 128-bit UUID. On Linux systems running systemd, this corresponds to the contents of <filename>/etc/machine-id</filename>. On success, the machine identity is stored in <parameter>machine</parameter>.</para> </refsect1> <refsect1> <title>Return Value</title> <para>On success, this function returns a non-negative integer. On failure, it returns a negative errno-style error code.</para> <refsect2> <title>Errors</title> <para>Returned errors may indicate the following problems:</para> <variablelist> <varlistentry> <term><constant>-EINVAL</constant></term> <listitem><para>An argument is invalid.</para></listitem> </varlistentry> <varlistentry> <term><constant>-ENOPKG</constant></term> <listitem><para>The bus cannot be resolved.</para></listitem> </varlistentry> <varlistentry> <term><constant>-ECHILD</constant></term> <listitem><para>The bus was created in a different process.</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-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry> </para> </refsect1> </refentry>