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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