+++ /dev/null
-<?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" conditional="ENABLE_KDBUS">
-
- <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 <systemd/sd-bus.h></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 64-bit 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 64-bit unsigned integer variable.</para>
- </refsect1>
-
- <refsect1>
- <title>Errors</title>
-
- <para>Returned errors may indicate the following problems:</para>
-
- <variablelist>
- <varlistentry>
- <term><constant>-EINVAL</constant></term>
-
- <listitem><para>A specified parameter
- is invalid.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><constant>-ENODATA</constant></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 a 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 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_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>
~ianmdlvl / elogind.git / blobdiff