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