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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
This file is part of systemd.
Copyright 2014 Zbigniew Jędrzejewski-Szmek
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
<refentry id="sd_bus_message_append_array" conditional="ENABLE_KDBUS"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>sd_bus_message_append_array</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>A monkey with a typewriter</contrib>
<firstname>Zbigniew</firstname>
<surname>Jędrzejewski-Szmek</surname>
<email>zbyszek@in.waw.pl</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>sd_bus_message_append_array</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>sd_bus_message_append_array</refname>
<refname>sd_bus_message_append_array_memfd</refname>
<refname>sd_bus_message_append_array_iovec</refname>
<refname>sd_bus_message_append_array_space</refname>
<refpurpose>Attach an array of items to a message</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
<funcprototype>
<funcdef>int sd_bus_message_append_array</funcdef>
<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
<paramdef>char <parameter>type</parameter></paramdef>
<paramdef>char void *<parameter>ptr</parameter></paramdef>
<paramdef>size_t <parameter>size</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>int sd_bus_message_append_array_memfd</funcdef>
<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
<paramdef>char <parameter>type</parameter></paramdef>
<paramdef>sd_memfd *<parameter>memfd</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>int sd_bus_message_append_array_iovec</funcdef>
<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
<paramdef>char <parameter>type</parameter></paramdef>
<paramdef>const struct iovec *<parameter>iov</parameter></paramdef>
<paramdef>unsigned <parameter>n</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>int sd_bus_message_append_array_space</funcdef>
<paramdef>char <parameter>type</parameter></paramdef>
<paramdef>size_t <parameter>size</parameter></paramdef>
<paramdef>char void **<parameter>ptr</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>The <function>sd_bus_message_append_array</function> functionc
appends items to message <parameter>m</parameter> as the single
array. A container will be opened, items appended, and the
container closed. Parameter <parameter>type</parameter> determines
how pointer <parameter>p</parameter> is interpreted.
<parameter>type</parameter> must be one of the "trivial" types
<literal>y</literal>, <literal>n</literal>, <literal>q</literal>,
<literal>i</literal>, <literal>u</literal>, <literal>x</literal>,
<literal>t</literal>, <literal>d</literal> (but not
<literal>b</literal>), as defined by the
<ulink url="http://dbus.freedesktop.org/doc/dbus-specification.html#basic-types">Basic Types</ulink>
section of the D-Bus specification, and listed in
<citerefentry><refentrytitle>sd_bus_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
Pointer <parameter>p</parameter> must point to an array of of size
<parameter>size</parameter> bytes containing items of the
respective type. Size <parameter>size</parameter> must be a
multiple of the size of the type <parameter>type</parameter>. As a
special case, <parameter>p</parameter> may be
<constant>NULL</constant>, if <parameter>size</parameter> is 0.
</para>
<para>The memory pointed at by <parameter>p</parameter> is copied
into the memory area containing the message and may be changed
after this call.</para>
<para>The
<function>sd_bus_message_append_array_memfd</function> function appends
items to message <parameter>m</parameter>, similarly to
<function>sd_bus_message_append_array</function>. Contents of the
memory file descriptor <parameter>memfd</parameter> are used as
the contents of the array. Their size must be a multiple of the
size of the type <parameter>type</parameter>.</para>
<para>The descriptor specified with <parameter>memfd</parameter>
will be sealed and cannot be modified after this call.</para>
<para>The
<function>sd_bus_message_append_array_iovec</function> function appends
items to message <parameter>m</parameter>, similarly to
<function>sd_bus_message_append_array</function>. Contents of the
iovec <parameter>iov</parameter> are used as the contents of the
array. The total size of <parameter>iov</parameter> payload (the
sum of <structfield>iov_len</structfield> fields) must be a multiple
of the size of the type <parameter>type</parameter>.</para>
<para>The <parameter>iov</parameter> argument must point to
<parameter>n</parameter> <structname>struct iovec</structname>
structures. Each structure may have the
<structname>iov_base</structname> field set, in which case the
memory pointed to will be copied into the message, or unset, in
which case a block of zeros of length
<structname>iov_len</structname> bytes will be inserted. The
memory pointed at by <parameter>iov</parameter> may be changed
after this call.</para>
<para>The
<function>sd_bus_message_append_array_space</function> function appends
space for an array of items to message <parameter>m</parameter>.
It behaves the same as
<function>sd_bus_message_append_array</function>, but instead
of copying items to the message, it returns a pointer to the
destination area to the caller in pointer <parameter>p</parameter>.
</para>
</refsect1>
<refsect1>
<title>Return Value</title>
<para>On success, these calls return 0 or a positive integer. On
failure, they returns a negative errno-style error code.</para>
</refsect1>
<xi:include href="sd_bus_message_append_basic.xml" xpointer="errors" />
<refsect1>
<title>Notes</title>
<para><function>sd_bus_append_array()</function> and other
functions described here are available as a shared library, which
can be compiled and linked to with the
<constant>libsystemd</constant> <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
file.</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>,
<citerefentry><refentrytitle>sd_bus_message_append</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<ulink url="http://dbus.freedesktop.org/doc/dbus-specification.html">The D-Bus specification</ulink>
</para>
</refsect1>
</refentry>
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