mirror of
https://github.com/systemd/systemd.git
synced 2024-11-01 09:21:26 +03:00
191 lines
8.0 KiB
XML
191 lines
8.0 KiB
XML
<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
|
||
<!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>int <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 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 project='die-net'><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>
|