systemd/man/sd_bus_slot_get_bus.xml
2020-11-09 13:23:58 +09:00

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<?xml version='1.0'?>
<!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_slot_get_bus" xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>sd_bus_slot_get_bus</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>sd_bus_slot_get_bus</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>sd_bus_slot_get_bus</refname>
<refname>sd_bus_slot_get_current_handler</refname>
<refname>sd_bus_slot_get_current_message</refname>
<refname>sd_bus_slot_get_current_userdata</refname>
<refpurpose>Query information attached to a bus slot object</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
<xi:include href="sd_bus_add_match.xml" xpointer="sd_bus_message_handler_t"/>
<funcprototype>
<funcdef>sd_bus *<function>sd_bus_slot_get_bus</function></funcdef>
<paramdef>sd_bus_slot *<parameter>slot</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>sd_bus_message_handler_t <function>sd_bus_slot_get_current_handler</function>
</funcdef>
<paramdef>sd_bus_slot *<parameter>slot</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>sd_bus_message *<function>sd_bus_slot_get_current_message</function></funcdef>
<paramdef>sd_bus_slot *<parameter>slot</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>void *<function>sd_bus_slot_get_current_userdata</function></funcdef>
<paramdef>sd_bus_slot *<parameter>slot</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><function>sd_bus_slot_get_bus()</function> returns the bus object that message
<parameter>slot</parameter> is attached to.</para>
<para><function>sd_bus_slot_get_current_handler()</function>,
<function>sd_bus_slot_get_current_message()</function> and
<function>sd_bus_slot_get_current_userdata()</function> return the current handler, message and
userdata respectively of the bus <parameter>slot</parameter> is attached to if we're currently
executing the callback associated with <parameter>slot</parameter>.</para>
</refsect1>
<refsect1>
<title>Return Value</title>
<para><function>sd_bus_slot_get_bus()</function> always returns the bus object.</para>
<para>On success, <function>sd_bus_slot_get_current_handler()</function>,
<function>sd_bus_slot_get_current_message()</function> and
<function>sd_bus_slot_get_current_userdata()</function> return the requested object. On failure,
they return <constant>NULL</constant>.</para>
</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>,
</para>
</refsect1>
</refentry>