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163 lines
6.9 KiB
XML
163 lines
6.9 KiB
XML
<!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_bus_message_set_destination" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_bus_message_set_destination</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_bus_message_set_destination</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_bus_message_set_destination</refname>
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<refname>sd_bus_message_get_destination</refname>
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<refname>sd_bus_message_get_path</refname>
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<refname>sd_bus_message_get_interface</refname>
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<refname>sd_bus_message_get_member</refname>
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<refname>sd_bus_message_set_sender</refname>
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<refname>sd_bus_message_get_sender</refname>
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<refpurpose>Set and query bus message addressing information</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_bus_message_set_destination</function></funcdef>
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<paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
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<paramdef>const char *<parameter>destination</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>const char* <function>sd_bus_message_get_destination</function></funcdef>
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<paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>const char* <function>sd_bus_message_get_path</function></funcdef>
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<paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>const char* <function>sd_bus_message_get_interface</function></funcdef>
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<paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>const char* <function>sd_bus_message_get_member</function></funcdef>
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<paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_message_set_sender</function></funcdef>
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<paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
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<paramdef>const char *<parameter>sender</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>const char* <function>sd_bus_message_get_sender</function></funcdef>
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<paramdef>sd_bus_message *<parameter>message</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_bus_message_set_destination()</function> sets the destination service name
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for the specified bus message object. The specified name must be a valid unique or well-known
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service name.</para>
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<para><function>sd_bus_message_get_destination()</function>,
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<function>sd_bus_message_get_path()</function>,
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<function>sd_bus_message_get_interface()</function>, and
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<function>sd_bus_message_get_member()</function> return the destination, path, interface, and
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member fields from <parameter>message</parameter> header. The return value will be
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<constant>NULL</constant> is <parameter>message</parameter> is <constant>NULL</constant> or the
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message is of a type that doesn't use those fields or the message doesn't have them set. See
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<citerefentry><refentrytitle>sd_bus_message_new_method_call</refentrytitle><manvolnum>3</manvolnum></citerefentry> and
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<citerefentry><refentrytitle>sd_bus_message_set_destination</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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for more discussion of those values.</para>
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<para><function>sd_bus_message_set_sender()</function> sets the sender service name for the specified bus message
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object. The specified name must be a valid unique or well-known service name. This function is useful only for
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messages to send on direct connections as for connections to bus brokers the broker will fill in the destination
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field anyway, and the sender field set by original sender is ignored.</para>
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<para><function>sd_bus_message_get_sender()</function> returns the sender field from
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<parameter>message</parameter>.</para>
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<para>When a string is returned, it is a pointer to internal storage, and may not be modified or
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freed. It is only valid as long as the <parameter>message</parameter> remains referenced and
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this field hasn't been changed by a different call.</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 calls return 0 or a positive integer. On failure, these calls return a
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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>-EINVAL</constant></term>
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<listitem><para>The <parameter>message</parameter> parameter or the output parameter are
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<constant>NULL</constant>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-EPERM</constant></term>
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<listitem><para>For <function>sd_bus_message_set_destination()</function> and
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<function>sd_bus_message_set_sender()</function>, the message is already sealed.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-EEXIST</constant></term>
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<listitem><para>The message already has a destination or sender field set.</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_bus_message_set_destination()</function> and
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<function>sd_bus_message_set_sender()</function> were added in version 237.</para>
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<para><function>sd_bus_message_get_destination()</function>,
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<function>sd_bus_message_get_path()</function>,
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<function>sd_bus_message_get_interface()</function>,
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<function>sd_bus_message_get_member()</function>, and
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<function>sd_bus_message_get_sender()</function> were added in version 240.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_bus_new</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_bus_set_sender</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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