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95 lines
3.4 KiB
XML
95 lines
3.4 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="sd_bus_get_current_handler" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_bus_get_current_handler</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_get_current_handler</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_get_current_handler</refname>
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<refname>sd_bus_get_current_message</refname>
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<refname>sd_bus_get_current_slot</refname>
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<refname>sd_bus_get_current_userdata</refname>
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<refpurpose>Query information of the callback a bus object is currently running</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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<xi:include href="sd_bus_add_match.xml" xpointer="sd_bus_message_handler_t"/>
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<funcprototype>
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<funcdef>sd_bus_message_handler_t <function>sd_bus_get_current_handler</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>sd_bus_message* <function>sd_bus_get_current_message</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>sd_bus_slot* <function>sd_bus_get_current_slot</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void* <function>sd_bus_get_current_userdata</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</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>Whenever sd-bus is about to invoke a user-supplied callback function, it stores the
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current callback, D-Bus message, slot and userdata pointer and allows these to be queried via
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<function>sd_bus_get_current_handler()</function>,
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<function>sd_bus_get_current_message()</function>,
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<function>sd_bus_get_current_slot()</function> and
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<function>sd_bus_get_current_userdata()</function>, respectively. If <parameter>bus</parameter>
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cannot be resolved or if execution does not reside in a user-supplied callback of
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<parameter>bus</parameter>, these functions return <constant>NULL</constant>.</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 the requested object. On failure, they return
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<constant>NULL</constant>.</para>
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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_get_current_handler()</function>,
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<function>sd_bus_get_current_message()</function>,
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<function>sd_bus_get_current_slot()</function>, and
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<function>sd_bus_get_current_userdata()</function> were added in version 221.</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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</simplelist></para>
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</refsect1>
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</refentry>
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