"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
+ SPDX-License-Identifier: LGPL-2.1+
+
This file is part of systemd.
Copyright 2014 Zbigniew Jędrzejewski-Szmek
<refnamediv>
<refname>sd_bus_message_append</refname>
+ <refname>sd_bus_message_appendv</refname>
<refpurpose>Attach fields to a D-Bus message based on a type
string</refpurpose>
<funcdef>int sd_bus_message_append</funcdef>
<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
<paramdef>const char *<parameter>types</parameter></paramdef>
- <paramdef>...</paramdef>
+ <paramdef>…</paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int sd_bus_message_appendv</funcdef>
+ <paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
+ <paramdef>const char *<parameter>types</parameter></paramdef>
+ <paramdef>va_list <parameter>ap</parameter></paramdef>
</funcprototype>
+
</funcsynopsis>
</refsynopsisdiv>
values for each entry matching the element type of
the dictionary entries.</para>
+ <para>The <function>sd_bus_message_appendv()</function> is equivalent to
+ the function <function>sd_bus_message_append()</function>,
+ except that it is called with a <literal>va_list</literal> instead of
+ a variable number of arguments. This function does not call the
+ <function>va_end()</function> macro. Because it invokes the
+ <function>va_arg()</function> macro, the value of ap
+ is undefined after the call.</para>
+
<para>For further details on the D-Bus type system, please consult
the <ulink
url="http://dbus.freedesktop.org/doc/dbus-specification.html#type-system">D-Bus
</tgroup>
</table>
+ <para>For types "s" and "g" (unicode string or signature), the pointer may be
+ <constant>NULL</constant>, which is equivalent to an empty string. See
+ <citerefentry><refentrytitle>sd_bus_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ for the precise interpretation of those and other types.</para>
+
</refsect1>
<refsect1>
</para>
<programlisting>sd_bus_message *m;
-...
+…
sd_bus_message_append(m, "s", "a string");</programlisting>
<para>Append all types of integers:</para>
<refsect1>
<title>Return Value</title>
- <para>On success, this call returns 0 or a positive
- integer. On failure, this call returns a negative
+ <para>On success, these functions return 0 or a positive
+ integer. On failure, these functions return a negative
errno-style error code.</para>
</refsect1>