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-<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
-"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
- This file is part of systemd.
-
- Copyright 2016 Julian Orth
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-
-<refentry id="sd_bus_add_match">
-
- <refentryinfo>
- <title>sd_bus_add_match</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <firstname>Julian</firstname>
- <surname>Orth</surname>
- <email>ju.orth@gmail.com</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>sd_bus_add_match</refentrytitle>
- <manvolnum>3</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>sd_bus_add_match</refname>
-
- <refpurpose>Add a match rule for message dispatching</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
-
- <funcprototype>
- <funcdef>int <function>sd_bus_add_match</function></funcdef>
- <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
- <paramdef>sd_bus_slot **<parameter>slot</parameter></paramdef>
- <paramdef>const char *<parameter>match</parameter></paramdef>
- <paramdef>sd_bus_message_handler_t <parameter>callback</parameter></paramdef>
- <paramdef>void *<parameter>userdata</parameter></paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>typedef int (*<function>sd_bus_message_handler_t</function>)</funcdef>
- <paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
- <paramdef>void *<parameter>userdata</parameter></paramdef>
- <paramdef>sd_bus_error *<parameter>ret_error</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para>
- <function>sd_bus_add_match()</function> adds a match rule used to dispatch
- incoming messages. The syntax of the rule passed in
- <parameter>match</parameter> is described in the
- <ulink url="https://dbus.freedesktop.org/doc/dbus-specification.html">D-Bus Specification</ulink>.
- </para>
-
- <para>
- The message <parameter>m</parameter> passed to the callback is only
- borrowed, that is, the callback should not call
- <citerefentry><refentrytitle>sd_bus_message_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- on it. If the callback wants to hold on to the message beyond the lifetime
- of the callback, it needs to call
- <citerefentry><refentrytitle>sd_bus_message_ref</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- to create a new reference.
- </para>
-
- <para>
- If an error occurs during the callback invocation, the callback should
- return a negative error number. If it wants other callbacks that match the
- same rule to be called, it should return 0. Otherwise it should return a
- positive integer.
- </para>
- </refsect1>
-
- <refsect1>
- <title>Return Value</title>
-
- <para>
- On success, <function>sd_bus_add_match()</function> returns 0 or a
- positive integer. On failure, it returns a negative errno-style error
- code.
- </para>
- </refsect1>
-
- <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>