mirror of
https://github.com/systemd/systemd.git
synced 2024-11-01 17:51:22 +03:00
120 lines
4.1 KiB
XML
120 lines
4.1 KiB
XML
<?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 <systemd/sd-bus.h></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>
|