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94 lines
3.4 KiB
XML
94 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_enqueue_for_read"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_bus_enqueue_for_read</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_enqueue_for_read</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_enqueue_for_read</refname>
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<refpurpose>Re-enqueue a bus message on a bus connection, for reading</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_enqueue_for_read</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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<paramdef>sd_bus_message *<parameter>message</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_enqueue_for_read()</function> may be used to re-enqueue an incoming bus message on
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the local read queue, so that it is processed and dispatched locally again, similarly to how an incoming
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message from the peer is processed. Takes a bus connection object and the message to enqueue. A reference
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is taken of the message and the caller's reference thus remains in possession of the caller. The message
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is enqueued at the end of the queue, thus will be dispatched after all other already queued messages are
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dispatched.</para>
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<para>This call is primarily useful for dealing with incoming method calls that may be processed only
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after an additional asynchronous operation completes. One example are PolicyKit authorization requests
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that are determined to be necessary to authorize a newly incoming method call: when the PolicyKit response
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is received the original method call may be re-enqueued to process it again, this time with the
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authorization result known.</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, this function return 0 or a positive integer. On failure, it returns a negative errno-style
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error code.</para>
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<refsect2>
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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, library or module instance.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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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_enqueue_for_read()</function> was added in version 245.</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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<member><citerefentry><refentrytitle>sd_bus_send</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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