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| Original file line number | Diff line number | Diff line change |
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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+ --> | ||
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| <refentry id="sd_bus_enqueue_for_read" | ||
| xmlns:xi="http://www.w3.org/2001/XInclude"> | ||
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| <refentryinfo> | ||
| <title>sd_bus_enqueue_for_read</title> | ||
| <productname>systemd</productname> | ||
| </refentryinfo> | ||
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| <refmeta> | ||
| <refentrytitle>sd_bus_enqueue_for_read</refentrytitle> | ||
| <manvolnum>3</manvolnum> | ||
| </refmeta> | ||
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| <refnamediv> | ||
| <refname>sd_bus_enqueue_for_read</refname> | ||
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| <refpurpose>Re-enqueue a bus message on a bus connection, for reading.</refpurpose> | ||
| </refnamediv> | ||
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| <refsynopsisdiv> | ||
| <funcsynopsis> | ||
| <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo> | ||
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| <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> | ||
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| </funcsynopsis> | ||
| </refsynopsisdiv> | ||
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| <refsect1> | ||
| <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 | ||
| 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> | ||
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| <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 authorize 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> | ||
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| <refsect1> | ||
| <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 | ||
| error code.</para> | ||
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| <refsect2> | ||
| <title>Errors</title> | ||
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| <para>Returned errors may indicate the following problems:</para> | ||
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| <variablelist> | ||
| <varlistentry> | ||
| <term><constant>-ECHILD</constant></term> | ||
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| <listitem><para>The bus connection has been created in a different process.</para></listitem> | ||
| </varlistentry> | ||
| </variablelist> | ||
| </refsect2> | ||
| </refsect1> | ||
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| <xi:include href="libsystemd-pkgconfig.xml" /> | ||
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| <refsect1> | ||
| <title>See Also</title> | ||
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| <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> | ||
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| </refentry> |
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I came here from the National Vulnerabilities Database when searching for a resolution to CVE-2020-1712: https://nvd.nist.gov/vuln/detail/CVE-2020-1712