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man: document the new sd_bus_enqueue_for_read() API call

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Lennart Poettering 2020-01-22 17:44:33 +01:00 committed by Zbigniew Jędrzejewski-Szmek
parent 6374862615
commit 5c11632735
2 changed files with 89 additions and 0 deletions
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1
man/rules/meson.build
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@ -195,6 +195,7 @@ manpages = [
'sd_bus_open_user_with_description',
'sd_bus_open_with_description'],
''],
['sd_bus_enqueue_for_read', '3', [], ''],
['sd_bus_error',
'3',
['SD_BUS_ERROR_MAKE_CONST',

88
man/sd_bus_enqueue_for_read.xml Normal file
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@ -0,0 +1,88 @@
<?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+ -->
<refentry id="sd_bus_enqueue_for_read"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>sd_bus_enqueue_for_read</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>sd_bus_enqueue_for_read</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>sd_bus_enqueue_for_read</refname>
<refpurpose>Re-enqueue a bus message on a bus connection, for reading.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
<funcprototype>
<funcdef>int <function>sd_bus_enqueue_for_read</function></funcdef>
<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
<paramdef>sd_bus_message *<parameter>message</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><function>sd_bus_enqueue_for_read()</function> may be used to re-enqueue an incoming bus message on
the local read queue, so that it is processed and dispatched locally again, similar to how an incoming
message from the peer is processed. Takes a bus connection object and the message to enqueue. A reference
is taken of the message and the caller's reference thus remains in possession of the caller. The message
is enqueued at the end of the queue, thus will be dispatched after all other already queued messages are
dispatched.</para>
<para>This call is primarily useful for dealing with incoming method calls that may be processed only
after an additional asynchronous operation completes. One example are PolicyKit authorization requests
that are determined to be necessary to autorize a newly incoming method call: when the PolicyKit response
is received the original method call may be re-enqueued to process it again, this time with the
authorization result known.</para>
</refsect1>
<refsect1>
<title>Return Value</title>
<para>On success, this function return 0 or a positive integer. On failure, it returns a negative errno-style
error code.</para>
<refsect2>
<title>Errors</title>
<para>Returned errors may indicate the following problems:</para>
<variablelist>
<varlistentry>
<term><constant>-ECHILD</constant></term>
<listitem><para>The bus connection has been created in a different process.</para></listitem>
</varlistentry>
</variablelist>
</refsect2>
</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>,
<citerefentry><refentrytitle>sd_bus_send</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
</para>
</refsect1>
</refentry>