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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 <systemd/sd-bus.h></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>
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