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+<!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_message_set_destination" xmlns:xi="http://www.w3.org/2001/XInclude">
+ <refentryinfo>
+ <title>sd_bus_message_set_destination</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_bus_message_set_destination</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_bus_message_set_destination</refname>
+ <refname>sd_bus_message_get_destination</refname>
+ <refname>sd_bus_message_get_path</refname>
+ <refname>sd_bus_message_get_interface</refname>
+ <refname>sd_bus_message_get_member</refname>
+ <refname>sd_bus_message_set_sender</refname>
+ <refname>sd_bus_message_get_sender</refname>
+
+ <refpurpose>Set and query bus message addressing information</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_message_set_destination</function></funcdef>
+ <paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
+ <paramdef>const char *<parameter>destination</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>const char* <function>sd_bus_message_get_destination</function></funcdef>
+ <paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>const char* <function>sd_bus_message_get_path</function></funcdef>
+ <paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>const char* <function>sd_bus_message_get_interface</function></funcdef>
+ <paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>const char* <function>sd_bus_message_get_member</function></funcdef>
+ <paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_message_set_sender</function></funcdef>
+ <paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
+ <paramdef>const char *<parameter>sender</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>const char* <function>sd_bus_message_get_sender</function></funcdef>
+ <paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><function>sd_bus_message_set_destination()</function> sets the destination service name
+ for the specified bus message object. The specified name must be a valid unique or well-known
+ service name.</para>
+
+ <para><function>sd_bus_message_get_destination()</function>,
+ <function>sd_bus_message_get_path()</function>,
+ <function>sd_bus_message_get_interface()</function>, and
+ <function>sd_bus_message_get_member()</function> return the destination, path, interface, and
+ member fields from <parameter>message</parameter> header. The return value will be
+ <constant>NULL</constant> is <parameter>message</parameter> is <constant>NULL</constant> or the
+ message is of a type that doesn't use those fields or the message doesn't have them set. See
+ <citerefentry><refentrytitle>sd_bus_message_new_method_call</refentrytitle><manvolnum>3</manvolnum></citerefentry> and
+ <citerefentry><refentrytitle>sd_bus_message_set_destination</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ for more discussion of those values.</para>
+
+ <para><function>sd_bus_message_set_sender()</function> sets the sender service name for the specified bus message
+ object. The specified name must be a valid unique or well-known service name. This function is useful only for
+ messages to send on direct connections as for connections to bus brokers the broker will fill in the destination
+ field anyway, and the sender field set by original sender is ignored.</para>
+
+ <para><function>sd_bus_message_get_sender()</function> returns the sender field from
+ <parameter>message</parameter>.</para>
+
+ <para>When a string is returned, it is a pointer to internal storage, and may not be modified or
+ freed. It is only valid as long as the <parameter>message</parameter> remains referenced and
+ this field hasn't been changed by a different call.</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>
+
+ <refsect2>
+ <title>Errors</title>
+
+ <para>Returned errors may indicate the following problems:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><constant>-EINVAL</constant></term>
+
+ <listitem><para>The <parameter>message</parameter> parameter or the output parameter are
+ <constant>NULL</constant>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>-EPERM</constant></term>
+
+ <listitem><para>For <function>sd_bus_message_set_destination()</function> and
+ <function>sd_bus_message_set_sender()</function>, the message is already sealed.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>-EEXIST</constant></term>
+
+ <listitem><para>The message already has a destination or sender field set.</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>,
+ <citerefentry><refentrytitle>sd_bus_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_bus_set_sender</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>