mirror of
https://github.com/systemd/systemd.git
synced 2024-11-01 17:51:22 +03:00
102 lines
3.9 KiB
XML
102 lines
3.9 KiB
XML
<?xml version='1.0'?>
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
|
|
<!--
|
|
SPDX-License-Identifier: LGPL-2.1+
|
|
-->
|
|
|
|
<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>
|
|
|
|
<refpurpose>Close and flush a bus connection</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<funcsynopsis>
|
|
<funcsynopsisinfo>#include <systemd/sd-bus.h></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>
|
|
</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 receieved 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>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Return Value</title>
|
|
|
|
<para>On success, <function>sd_bus_flush()</function> returns 0 or a positive integer. On failure, it returns a
|
|
negative errno-style error code.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<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.</para></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<xi:include href="libsystemd-pkgconfig.xml" />
|
|
|
|
<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>
|