mirror of
https://github.com/systemd/systemd.git
synced 2024-12-14 12:43:36 +08:00
7c071fda94
The list of man pages is auto generated, based on conditonal='...' attributes in the man page itself.
153 lines
6.4 KiB
XML
153 lines
6.4 KiB
XML
<?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><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 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><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>
|