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fe45f8dc9b
In the troff output, this doesn't seem to make any difference. But in the html output, the whitespace is sometimes preserved, creating an additional gap before the following content. Drop it everywhere to avoid this.
109 lines
3.9 KiB
XML
109 lines
3.9 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/4.5/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>. If <parameter>f</parameter> is
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<constant>NULL</constant>, standard output (<constant>stdio</constant>) will be used. This function is
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intended to be used for debugging purposes, and the output is neither stable nor designed to be machine
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readable.</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><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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