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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_message_dump"
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>sd_bus_message_dump</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_bus_message_dump</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_bus_message_dump</refname>
+
+ <refpurpose>Produce a string representation of a message for debugging purposes</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>int sd_bus_message_dump</funcdef>
+ <paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
+ <paramdef>FILE *<parameter>f</parameter></paramdef>
+ <paramdef>uint64_t <parameter>flags</parameter></paramdef>
+ </funcprototype>
+ </funcsynopsis>
+
+ <para>
+ <constant>SD_BUS_MESSAGE_DUMP_WITH_HEADER</constant>,
+ <constant>SD_BUS_MESSAGE_DUMP_SUBTREE_ONLY</constant>
+ </para>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para>The <function>sd_bus_message_dump()</function> function writes a textual representation of the
+ message <parameter>m</parameter> to the stream <parameter>f</parameter>. If <parameter>f</parameter> is
+ <constant>NULL</constant>, standard output (<constant>stdio</constant>) will be used. This function is
+ intended to be used for debugging purposes, and the output is neither stable nor designed to be machine
+ readable.</para>
+
+ <para>The <parameter>flags</parameter> parameter may be used to modify the output. With
+ <constant>SD_BUS_MESSAGE_DUMP_WITH_HEADER</constant>, a header that specifies the message type and flags
+ and some additional metadata is printed. When <constant>SD_BUS_MESSAGE_DUMP_SUBTREE_ONLY</constant> is
+ not passed, the contents of the whole message are printed. When it <emphasis>is</emphasis> passed,
+ only the current container in printed.</para>
+
+ <para>Note that this function moves the read pointer of the message. It may be necessary to reset the
+ position afterwards, for example with
+ <citerefentry><refentrytitle>sd_bus_message_rewind</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
+ </para>
+ </refsect1>
+
+ <refsect1>
+ <title>Examples</title>
+
+ <para>Output for a signal message (with <constant>SD_BUS_MESSAGE_DUMP_WITH_HEADER</constant>):
+ <programlisting>
+‣ Type=signal Endian=l Flags=1 Version=1 Cookie=22
+ Path=/value/a Interface=org.freedesktop.DBus.Properties Member=PropertiesChanged
+ MESSAGE "sa{sv}as" {
+ STRING "org.freedesktop.systemd.ValueTest";
+ ARRAY "{sv}" {
+ DICT_ENTRY "sv" {
+ STRING "Value";
+ VARIANT "s" {
+ STRING "object 0x1e, path /value/a";
+ };
+ };
+ };
+ ARRAY "s" {
+ STRING "Value2";
+ STRING "AnExplicitProperty";
+ };
+ };
+ </programlisting>
+ </para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para>On success, this function returns 0 or a positive integer. On failure, it returns a negative
+ errno-style error code. No error codes are currently defined.</para>
+ </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>
+ </para>
+ </refsect1>
+
+</refentry>