man: add missing sd_bus_message_get_cookie man page fie

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diff --git a/man/sd_bus_message_get_cookie.xml b/man/sd_bus_message_get_cookie.xml
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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 2013 Lennart Poettering
+
+  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_get_cookie">
+
+        <refentryinfo>
+                <title>sd_bus_message_get_cookie</title>
+                <productname>systemd</productname>
+
+                <authorgroup>
+                        <author>
+                                <contrib>Developer</contrib>
+                                <firstname>Lennart</firstname>
+                                <surname>Poettering</surname>
+                                <email>lennart@poettering.net</email>
+                        </author>
+                </authorgroup>
+        </refentryinfo>
+
+        <refmeta>
+                <refentrytitle>sd_bus_message_get_cookie</refentrytitle>
+                <manvolnum>3</manvolnum>
+        </refmeta>
+
+        <refnamediv>
+                <refname>sd_bus_message_get_cookie</refname>
+                <refname>sd_bus_message_get_reply_cookie</refname>
+                <refpurpose>Returns the transaction cookie of a message</refpurpose>
+        </refnamediv>
+
+        <refsynopsisdiv>
+                <funcsynopsis>
+                        <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
+
+                        <funcprototype>
+                                <funcdef>int <function>sd_bus_message_get_cookie</function></funcdef>
+                                <paramdef>sd_bus_message* <parameter>message</parameter></paramdef>
+                                <paramdef>uint64_t* <parameter>cookie</parameter></paramdef>
+                        </funcprototype>
+
+                        <funcprototype>
+                                <funcdef>int <function>sd_bus_message_get_reply_cookie</function></funcdef>
+                                <paramdef>sd_bus_message* <parameter>message</parameter></paramdef>
+                                <paramdef>uint64_t* <parameter>cookie</parameter></paramdef>
+                        </funcprototype>
+                </funcsynopsis>
+        </refsynopsisdiv>
+
+        <refsect1>
+                <title>Description</title>
+
+                <para><function>sd_bus_message_get_cookie()</function> returns
+                the transaction cookie of a message. The cookie
+                uniquely identifies a message within each bus peer,
+                but is not globally unique. It is assigned when a
+                message is sent.</para>
+
+                <para><function>sd_bus_message_get_reply_cookie()</function>
+                returns the transaction cookie of the message the
+                specified message is a response to. When a reply
+                message is generated for a method call message its
+                cookie is copied over into this field. Note that while
+                every message that is transferred is identified by a
+                cookie, only response messages carry a reply cookie
+                field.</para>
+
+                <para>Both functions take a message object as first
+                parameter and a place to store the 64bit cookie
+                in.</para>
+        </refsect1>
+
+        <refsect1>
+                <title>Return Value</title>
+
+                <para>On success, these calls return 0 or a positive
+                integer. On failure, these calls return a negative
+                errno-style error code.</para>
+
+                <para>On success the cookie/reply cookie is returned
+                in the specified 64bit unsigned integer variable.</para>
+        </refsect1>
+
+        <refsect1>
+                <title>Errors</title>
+
+                <para>Returned errors may indicate the following problems:</para>
+
+                <variablelist>
+                        <varlistentry>
+                                <term><varname>-EINVAL</varname></term>
+
+                                <listitem><para>A specified parameter
+                                is invalid.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><varname>-ENODATA</varname></term>
+
+                                <listitem><para>No cookie has been
+                                assigned to this message. This either
+                                indicates that the message has not
+                                been sent yet and hence has no cookie
+                                assigned, or that the message is not a
+                                method response message and hence
+                                carries to reply cookie
+                                field.</para></listitem>
+                        </varlistentry>
+                </variablelist>
+        </refsect1>
+
+        <refsect1>
+                <title>Notes</title>
+
+                <para>The <function>sd_bus_message_get_cookie()</function>
+                and <function>sd_bus_message_get_reply_cookie()</function>
+                interfaces are available as shared library, which can
+                be compiled and linked to with the
+                <constant>libsystemd-bus</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_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+                </para>
+        </refsect1>
+
+</refentry>