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114 lines
4.8 KiB
XML
114 lines
4.8 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1+ -->
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<refentry id="sd_bus_close"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_bus_close</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_bus_close</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_bus_close</refname>
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<refname>sd_bus_flush</refname>
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<refname>sd_bus_default_flush_close</refname>
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<refpurpose>Close and flush a bus connection</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>void <function>sd_bus_close</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_flush</function></funcdef>
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<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>sd_bus_default_flush_close</function></funcdef>
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<paramdef>void</paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_bus_close()</function> disconnects the specified bus connection. When this call is invoked and
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the specified bus object refers to an active connection it is immediately terminated. No further messages may be
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sent or received on it. Any messages queued in the bus object (both incoming and outgoing) are released. If
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invoked on <constant>NULL</constant> bus object or when the bus connection is already closed this function executes
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no operation. This call does not free or unreference the bus object itself. Use
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<citerefentry><refentrytitle>sd_bus_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry> for that.</para>
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<para><function>sd_bus_flush()</function> synchronously writes out all outgoing queued message on a bus connection
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if there are any. This function call may block if the peer is not processing bus messages quickly.</para>
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<para>Before a program exits it is usually a good idea to flush any pending messages with
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<function>sd_bus_flush()</function> and then close connections with <function>sd_bus_close()</function> to ensure
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that no unwritten messages are lost, no further messages may be queued and all incoming but unprocessed messages
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are released. After both operations have been done, it is a good idea to also drop any remaining references to the
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bus object so that it may be freed. Since these three operations are frequently done together a helper call
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<citerefentry><refentrytitle>sd_bus_flush_close_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry> is
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provided that combines them into one.</para>
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<para><function>sd_bus_default_flush_close()</function> is similar to
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<function>sd_bus_flush_close_unref</function>, but does not take a bus pointer argument and instead
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iterates over any of the "default" busses opened by
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<citerefentry><refentrytitle>sd_bus_default</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_default_user</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_default_system</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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and similar calls. <function>sd_bus_default_flush_close()</function> is particularly useful to clean up
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any busses opened using those calls before the program exits.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>On success, <function>sd_bus_flush()</function> returns 0 or a positive integer. On failure, it returns a
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negative errno-style error code.</para>
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<refsect2>
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<title>Errors</title>
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<para>Returned errors may indicate the following problems:</para>
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<variablelist>
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<varlistentry>
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<term><constant>-ECHILD</constant></term>
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<listitem><para>The bus connection has been created in a different process.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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</refsect1>
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<xi:include href="libsystemd-pkgconfig.xml" />
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_set_close_on_exit</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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