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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
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Adding upstream version 255.4.upstream/255.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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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-or-later -->
+
+<refentry id="sd_bus_close"
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>sd_bus_close</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_bus_close</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_bus_close</refname>
+ <refname>sd_bus_flush</refname>
+ <refname>sd_bus_default_flush_close</refname>
+
+ <refpurpose>Close and flush a bus connection</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>void <function>sd_bus_close</function></funcdef>
+ <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_bus_flush</function></funcdef>
+ <paramdef>sd_bus *<parameter>bus</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>void <function>sd_bus_default_flush_close</function></funcdef>
+ <paramdef>void</paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><function>sd_bus_close()</function> disconnects the specified bus connection. When this
+ call is invoked and the specified bus object refers to an active connection it is immediately
+ terminated. No further messages may be sent or received on it. Any messages queued in the bus
+ object (both incoming and outgoing) are released. If invoked on <constant>NULL</constant> bus
+ object or when the bus connection is already closed this function executes no operation. This
+ call does not free or unreference the bus object itself. Use
+ <citerefentry><refentrytitle>sd_bus_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ for that.</para>
+
+ <para><function>sd_bus_flush()</function> synchronously writes out all outgoing queued message
+ on a bus connection if there are any. This function call may block if the peer is not processing
+ bus messages quickly.</para>
+
+ <para>Before a program exits it is usually a good idea to flush any pending messages with
+ <function>sd_bus_flush()</function> and then close connections with
+ <function>sd_bus_close()</function> to ensure that no unwritten messages are lost, no further
+ messages may be queued and all incoming but unprocessed messages are released. After both
+ operations have been done, it is a good idea to also drop any remaining references to the bus
+ object so that it may be freed. Since these three operations are frequently done together a
+ helper call
+ <citerefentry><refentrytitle>sd_bus_flush_close_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ is provided that combines them into one.</para>
+
+ <para><function>sd_bus_default_flush_close()</function> is similar to
+ <function>sd_bus_flush_close_unref()</function>, but does not take a bus pointer argument and
+ instead iterates over any of the "default" buses opened by
+ <citerefentry><refentrytitle>sd_bus_default</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_bus_default_user</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_bus_default_system</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ and similar calls. <function>sd_bus_default_flush_close()</function> is particularly useful to
+ clean up any buses opened using those calls before the program exits.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para>On success, <function>sd_bus_flush()</function> returns a non-negative 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, library or module instance.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect2>
+ </refsect1>
+
+ <xi:include href="libsystemd-pkgconfig.xml" />
+
+ <refsect1>
+ <title>History</title>
+ <para><function>sd_bus_close()</function> and
+ <function>sd_bus_flush()</function> were added in version 240.</para>
+ <para><function>sd_bus_default_flush_close()</function> was added in version 246.</para>
+ </refsect1>
+
+ <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_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_bus_set_close_on_exit</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>