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<?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+
Copyright © 2016 Julian Orth
-->
<refentry id="sd_bus_process">
<refentryinfo>
<title>sd_bus_process</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>sd_bus_process</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>sd_bus_process</refname>
<refpurpose>Drive the connection</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
<funcprototype>
<funcdef>int <function>sd_bus_process</function></funcdef>
<paramdef>sd_bus *<parameter>bus</parameter></paramdef>
<paramdef>sd_bus_message **<parameter>r</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<function>sd_bus_process()</function> drives the connection between the
message bus and the client. That is, it handles connecting,
authentication, and message processing. It should be called in a loop
until no further progress can be made or an error occurs.
</para>
<para>
Once no further progress can be made,
<citerefentry><refentrytitle>sd_bus_wait</refentrytitle><manvolnum>3</manvolnum></citerefentry>
should be called. Alternatively the user can wait for incoming data on
the file descriptor returned by
<citerefentry><refentrytitle>sd_bus_get_fd</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
</para>
<para>
<function>sd_bus_process</function> processes at most one incoming
message per call. If the parameter <parameter>r</parameter> is not NULL
and the call processed a message, <code>*r</code> is set to this message.
The caller owns a reference to this message and should call
<citerefentry><refentrytitle>sd_bus_message_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>
when the message is no longer needed. If <parameter>r</parameter> is not
NULL, progress was made, but no message was processed, <code>*r</code> is
set to NULL.
</para>
</refsect1>
<refsect1>
<title>Return Value</title>
<para>
If progress was made, a positive integer is returned. If no progress was
made, 0 is returned. If an error occurs, a negative errno-style error code
is returned.
</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>,
</para>
</refsect1>
</refentry>
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