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-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
-"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
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- This file is part of systemd.
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- Copyright 2018 Lennart Poettering
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- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
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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+ -->
<refentry id="sd_bus_get_n_queued_read">
<refentryinfo>
<title>sd_bus_get_fd</title>
<productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
</refentryinfo>
<refmeta>
<para>
<function>sd_bus_get_n_queued_read()</function> may be used to query the number of bus messages in the read queue
of a bus connection object. The read queue contains all messages read from the transport medium (e.g. network
- socket) but not yet processed locally. The function expects two arguments: the bus object to query the number of
- queued messages of, and a pointer to a 64bit counter variable to write the current queue size to. Use
- <function>sd_bus_process()</function> in order to process queued messages, i.e. to reduce the size of the read
- queue (as well as, in fact, the write queue, see below) when it is non-zero.
+ socket) but not yet processed locally. The function expects two arguments: the bus object to query, and a pointer
+ to a 64bit counter variable to write the current queue size to. Use <function>sd_bus_process()</function> in
+ order to process queued messages, i.e. to reduce the size of the read queue (as well as, in fact, the write
+ queue, see below).
</para>
<para>
- Similar, <function>sd_bus_get_n_queued_write()</function> may be used to query the number of currently pending
+ Similarly, <function>sd_bus_get_n_queued_write()</function> may be used to query the number of currently pending
bus messages in the write queue of a bus connection object. The write queue contains all messages enqueued into
the connection with a call such as <function>sd_bus_send()</function> but not yet written to the transport
- medium. The expected arguments are similar to the ones of <function>sd_bus_get_n_queued_read()</function>. Here
- too, use <function>sd_bus_process()</function> to reduce the size of the write queue. Alternatively, use
+ medium. The expected arguments are similar to <function>sd_bus_get_n_queued_read()</function>. Here too, use
+ <function>sd_bus_process()</function> to reduce the size of the write queue. Alternatively, use
<function>sd_bus_flush()</function> to synchronously write out any pending bus messages until the write queue is
empty.
</para>
<para>On success, these functions return 0 or a positive integer. On failure, they return a negative errno-style
error code.</para>
- </refsect1>
- <refsect1>
- <title>Errors</title>
+ <refsect2>
+ <title>Errors</title>
- <para>Returned errors may indicate the following problems:</para>
+ <para>Returned errors may indicate the following problems:</para>
- <variablelist>
- <varlistentry>
- <term><constant>-ECHILD</constant></term>
+ <variablelist>
+ <varlistentry>
+ <term><constant>-ECHILD</constant></term>
- <listitem><para>The bus connection has been created in a different process.</para></listitem>
- </varlistentry>
+ <listitem><para>The bus connection was created in a different process.</para></listitem>
+ </varlistentry>
- </variablelist>
+ </variablelist>
+ </refsect2>
</refsect1>
<refsect1>