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111 lines
4.0 KiB
XML
111 lines
4.0 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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SPDX-License-Identifier: LGPL-2.1+
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-->
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<refentry id="sd_bus_set_sender">
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<refentryinfo>
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<title>sd_bus_set_sender</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_set_sender</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_set_sender</refname>
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<refname>sd_bus_get_sender</refname>
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<refpurpose>Configure default sender for outgoing messages</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_set_sender</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>const char* <parameter>name</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_get_sender</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>const char** <parameter>name</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_set_sender()</function> configures the default sender service name to use for outgoing
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messages. The service name specified in the <parameter>name</parameter> parameter is set on all outgoing messages
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that are sent on the connection and have no sender set yet, for example through
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<citerefentry><refentrytitle>sd_bus_message_set_sender</refentrytitle><manvolnum>3</manvolnum></citerefentry>. Note
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that this function is only supported on direct connections, i.e. not on connections to a bus broker as the broker
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will fill in the sender service name automatically anyway. By default no sender name is configured, and hence
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messages are sent without sender field set. If the <parameter>name</parameter> parameter is specified as
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<constant>NULL</constant> the default sender service name is cleared, returning to the default state if a default
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sender service name was set before. If passed as non-<constant>NULL</constant> the specified name must be a valid
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unique or well-known service name.</para>
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<para><function>sd_bus_get_sender()</function> may be used to query the current default service name for outgoing
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messages.</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 0 or a positive integer. On failure, they return a negative errno-style
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error code.</para>
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</refsect1>
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<refsect1>
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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>-ECHILD</constant></term>
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<listitem><para>The bus connection has been created in a different process.</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>The specified bus connection object is a not a direct but a brokered connection.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para><function>sd_bus_set_sender()</function> and <function>sd_bus_get_sender()</function> are available as
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a shared library, which can be compiled and linked to with the <constant>libsystemd</constant> <citerefentry
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project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> file.</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-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_message_set_sender</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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