1207 lines
40 KiB
XML
1207 lines
40 KiB
XML
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<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
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"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
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<!-- lifted from troff+ms+XMan by doclifter -->
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<book id="xtrans">
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<bookinfo>
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<title>X Transport Interface</title>
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<subtitle>X Consortium Standard</subtitle>
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<releaseinfo>X Version 11, Release 7.X</releaseinfo>
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<authorgroup>
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<author>
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<firstname>Stuart</firstname><surname>Anderson</surname>
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</author>
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</authorgroup>
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<othercredit><firstname>Ralph</firstname><surname>Mor</surname></othercredit>
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<othercredit><firstname>Alan</firstname><surname>Coopersmith</surname></othercredit>
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<corpname>NCR Corporation</corpname>
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<releaseinfo>Version 0.7</releaseinfo>
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<affiliation><orgname>The Open Group</orgname></affiliation>
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<productnumber>X Version 11, Release 7.x</productnumber>
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<legalnotice>
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<para>
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Copyright © 1993, 1994 NCR Corporation - Dayton, Ohio, USA
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</para>
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<para>
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All Rights Reserved
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</para>
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<para>
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted, provided
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that the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation, and that the name NCR not be used in advertising
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or publicity pertaining to distribution of the software without specific,
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written prior permission. NCR makes no representations about the
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|
suitability of this software for any purpose. It is provided "as is"
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without express or implied warranty.
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</para>
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<para>
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NCR DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
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NO EVENT SHALL NCR BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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|
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CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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</para>
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</legalnotice>
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<legalnotice>
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<para>
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Copyright © 1993, 1994, 2002 The Open Group
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</para>
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<para>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the “Software”), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
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copies of the Software, and to permit persons to whom the Software is
|
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|
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furnished to do so, subject to the following conditions:
|
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</para>
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<para>
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The above copyright notice and this permission notice shall be included in
|
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all copies or substantial portions of the Software.
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</para>
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<para>
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THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
|
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|
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
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</para>
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<para>
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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</para>
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<para>
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X Window System is a trademark of The Open Group, Inc.
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</para>
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</legalnotice>
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</bookinfo>
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<preface><title>The X Transport Interface</title>
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<para>
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Designed by Stuart Anderson (NCR) with help from Ralph Mor (X Consortium)
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</para>
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<note><para>
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This documentation does not completely match the implementation in R6
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(as a result of some late changes made in the code). Specifically, support
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was added for font server cloning, and conditional compliation was introduced
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for client vs. server code.
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</para></note>
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</preface>
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<chapter id='purposes_and_goals'>
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<title>Purposes and Goals</title>
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<para>The X Transport Interface is intended to combine all system and
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transport specific code into a single place in the source tree. This API
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should be used by all libraries, clients and servers of the X Window System.
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Use of this API should allow the addition of new types of transports and
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support for new platforms without making any changes to the source except
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in the X Transport Interface code.</para>
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<para>This interface should solve the problem of multiple
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<code>#ifdef TRANSPORT</code> and <code>#ifdef PLATFORM</code>
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statements scattered throughout the source tree.</para>
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<para>This interface should provide enough functionality to support all
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types of protocols, including connection oriented protocols such as X11 and
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FS, and connection-less oriented protocols such as XDMCP.</para>
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</chapter>
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<chapter id='overview_of_the_interface'>
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<title>Overview of the Interface</title>
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<para>
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The interface provides an API for use by applications. The functions in
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this API perform work that is common to all transports and systems, such
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as parsing an address into a host and port number. The functions in this
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API call transport specific functions that are contained in a table whose
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contents are defined at compile time. This table contains an entry for each
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type of transport. Each entry is a record containing mostly pointers to
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function that implements the interface for the given transport.
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</para>
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<para>
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This API does not provide an abstraction for <function>select()</function>
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or <function>poll()</function>.
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These functions are themselves transport independent, so an additional
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interface is not needed for these functions. It is also unclear how such
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an interface would affect performance.
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</para>
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</chapter>
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<chapter id='definition_of_address_specification_format'>
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<title>Definition of Address Specification Format</title>
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<para>
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Addresses are specified in the following syntax,
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<synopsis>
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<replaceable>protocol</replaceable>/<replaceable>host</replaceable>:<replaceable>port</replaceable>
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</synopsis>
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where <replaceable>protocol</replaceable> specifies a protocol family
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or an alias for a protocol family. A definition of common protocol
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families is given in a later section.
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</para>
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<para>
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The <replaceable>host</replaceable> part specifies the name of a host or other
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transport dependent entity that could be interpreted as a Network Service Access Point
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(NSAP).
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</para>
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<para>
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The <replaceable>port</replaceable> part specifies the name of a Transport Service
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Access Point (TSAP). The format of the TSAP is defined by the underlying transport
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implementation, but it is represented using a string format when it is
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part of an address.
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</para>
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</chapter>
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<chapter id='internal_data_structures'>
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<title>Internal Data Structures</title>
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<para>
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There are two major data structures associated with the transport
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independent portion of this interface. Additional data structures
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may be used internally by each transport.
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</para>
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<sect1 id="xtransport">
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<title>Xtransport</title>
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<para>
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Each transport supported has an entry in the transport table. The transport
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table is an array of Xtransport records. Each record contains all the entry
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points for a single transport. This record is defined as:
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</para>
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<synopsis>
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typedef struct _Xtransport {
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char *TransName;
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int flags;
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XtransConnInfo (*OpenCOTSClient)(
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struct _Xtransport *, /* transport */
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char *, /* protocol */
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char *, /* host */
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char * /* port */
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);
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XtransConnInfo (*OpenCOTSServer)(
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struct _Xtransport *, /* transport */
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char *, /* protocol */
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char *, /* host */
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char * /* port */
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);
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XtransConnInfo (*OpenCLTSClient)(
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struct _Xtransport *, /* transport */
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char *, /* protocol */
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char *, /* host */
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char * /* port */
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);
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XtransConnInfo (*OpenCLTSServer)(
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struct _Xtransport *, /* transport */
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char *, /* protocol */
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char *, /* host */
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char * /* port */
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);
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int (*SetOption)(
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XtransConnInfo, /* connection */
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int, /* option */
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int /* arg */
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);
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int (*CreateListener)(
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XtransConnInfo, /* connection */
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char *, /* port */
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int /* flags */
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);
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int (*ResetListener)(
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XtransConnInfo /* connection */
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);
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XtransConnInfo (*Accept)(
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XtransConnInfo /* connection */
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);
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int (*Connect)(
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XtransConnInfo, /* connection */
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char *, /* host */
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char * /* port */
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);
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int (*BytesReadable)(
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XtransConnInfo, /* connection */
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BytesReadable_t * /* pend */
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);
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int (*Read)(
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XtransConnInfo, /* connection */
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char *, /* buf */
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int /* size */
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);
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int (*Write)(
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XtransConnInfo, /* connection */
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char *, /* buf */
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int /* size */
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);
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int (*Readv)(
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XtransConnInfo, /* connection */
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struct iovec *, /* buf */
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int /* size */
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);
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int (*Writev)(
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XtransConnInfo, /* connection */
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struct iovec *, /* buf */
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int /* size */
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);
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int (*Disconnect)(
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XtransConnInfo /* connection */
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);
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int (*Close)(
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XtransConnInfo /* connection */
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);
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} Xtransport;
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</synopsis>
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<para>
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The <structfield>flags</structfield> field can contain an OR of
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the following masks:
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<variablelist>
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<varlistentry>
|
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<term><symbol>TRANS_ALIAS</symbol></term>
|
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<listitem><para>
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indicates that this record is providing an alias, and should
|
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not be used to create a listener.
|
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</para></listitem>
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</varlistentry>
|
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<varlistentry>
|
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<term><symbol>TRANS_LOCAL</symbol></term>
|
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<listitem><para>
|
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indicates that this is a <symbol>LOCALCONN</symbol> transport.
|
|||
|
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</para></listitem>
|
|||
|
|
</varlistentry>
|
|||
|
|
<varlistentry>
|
|||
|
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<term><symbol>TRANS_ABSTRACT</symbol></term>
|
|||
|
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<listitem><para>
|
|||
|
|
indicates that a local connection transport uses the abstract socket namespace.
|
|||
|
|
</para></listitem>
|
|||
|
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</varlistentry>
|
|||
|
|
</variablelist>
|
|||
|
|
</para>
|
|||
|
|
|
|||
|
|
<para>
|
|||
|
|
Some additional flags may be set in the <structfield>flags</structfield>
|
|||
|
|
field by the library while it is running:
|
|||
|
|
<variablelist>
|
|||
|
|
<varlistentry>
|
|||
|
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<term><symbol>TRANS_DISABLED</symbol></term>
|
|||
|
|
<listitem><para>
|
|||
|
|
indicates that this transport has been disabled.
|
|||
|
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</para></listitem>
|
|||
|
|
</varlistentry>
|
|||
|
|
<varlistentry>
|
|||
|
|
<term><symbol>TRANS_NOLISTEN</symbol></term>
|
|||
|
|
<listitem><para>
|
|||
|
|
indicates that servers should not open new listeners using this transport.
|
|||
|
|
</para></listitem>
|
|||
|
|
</varlistentry>
|
|||
|
|
<varlistentry>
|
|||
|
|
<term><symbol>TRANS_NOUNLINK</symbol></term>
|
|||
|
|
<listitem><para>
|
|||
|
|
set by a transport backend to indicate that the endpoints for its connection
|
|||
|
|
should not be unlinked.
|
|||
|
|
</para></listitem>
|
|||
|
|
</varlistentry>
|
|||
|
|
</variablelist>
|
|||
|
|
</para>
|
|||
|
|
</sect1>
|
|||
|
|
|
|||
|
|
<sect1 id="xtransconninfo">
|
|||
|
|
<title>XtransConnInfo</title>
|
|||
|
|
<para>
|
|||
|
|
Each connection will have an opaque <structname>XtransConnInfo</structname>
|
|||
|
|
transport connection
|
|||
|
|
object allocated for it. This record contains information specific to the
|
|||
|
|
connection. The record is defined as:
|
|||
|
|
|
|||
|
|
<synopsis>
|
|||
|
|
typedef struct _XtransConnInfo *XtransConnInfo;
|
|||
|
|
|
|||
|
|
struct _XtransConnInfo {
|
|||
|
|
struct _Xtransport *transptr;
|
|||
|
|
char *priv;
|
|||
|
|
int flags;
|
|||
|
|
int fd;
|
|||
|
|
int family;
|
|||
|
|
char *addr;
|
|||
|
|
int addrlen;
|
|||
|
|
char *peeraddr;
|
|||
|
|
int peeraddrlen;
|
|||
|
|
};
|
|||
|
|
</synopsis>
|
|||
|
|
</para>
|
|||
|
|
</sect1>
|
|||
|
|
</chapter>
|
|||
|
|
|
|||
|
|
<chapter id='exposed_transport_independent_api'>
|
|||
|
|
<title>Exposed Transport Independent API</title>
|
|||
|
|
|
|||
|
|
<para>
|
|||
|
|
This API is included in each library and server that uses it. The API may
|
|||
|
|
be used by the library, but it is not added to the public API for that
|
|||
|
|
library. This interface is simply an implementation facilitator. This API
|
|||
|
|
contains a low level set of core primitives, and a few utility functions
|
|||
|
|
that are built on top of the primitives. The utility functions exist to
|
|||
|
|
provide a more familiar interface that can be used to port existing code.
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
A macro is defined in Xtrans.h for TRANS(func) that creates a unique function
|
|||
|
|
name depending on where the code is compiled. For example, when built for
|
|||
|
|
Xlib, TRANS(OpenCOTSClient) becomes <function>_X11TransOpenCOTSClient</function>.
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
All failures are considered fatal, and the connection should be closed
|
|||
|
|
and re-established if desired. In most cases, however, the value of
|
|||
|
|
errno will be available for debugging purposes.
|
|||
|
|
</para>
|
|||
|
|
<sect1 id="core_interface_api">
|
|||
|
|
<title>Core Interface API</title>
|
|||
|
|
<itemizedlist mark='bullet'>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
XtransConnInfo TRANS(OpenCOTSClient)(char *address)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function creates a Connection-Oriented Transport that is
|
|||
|
|
suitable for use by a client. The parameter <parameter>address</parameter>
|
|||
|
|
contains the full address of the server to which this endpoint will be connected. This
|
|||
|
|
functions returns an opaque transport connection object on success, or
|
|||
|
|
NULL on failure.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
XtransConnInfo TRANS(OpenCOTSServer)(char *address)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function creates a Connection-Oriented Transport that is suitable
|
|||
|
|
for use by a server. The parameter <parameter>address</parameter> contains the
|
|||
|
|
full address to which this server will be bound. This functions returns an opaque
|
|||
|
|
transport connection object on success, or NULL on failure.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
XtransConnInfo TRANS(OpenCLTSClient)(char *address)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function creates a Connection-Less Transport that is suitable for
|
|||
|
|
use by a client. The parameter <parameter>address</parameter> contains the
|
|||
|
|
full address of the server to which this endpoint will be connected. This functions
|
|||
|
|
returns an opaque transport connection object on success, or NULL on failure.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
XtransConnInfo TRANS(OpenCLTSServer)(char *address)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function creates a Connection-Less Transport that is suitable for
|
|||
|
|
use by a server. The parameter <parameter>address</parameter> contains the
|
|||
|
|
full address to which this server will be bound. This functions returns an opaque
|
|||
|
|
transport connection object on success, or NULL on failure.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(SetOption)(XtransConnInfo connection, int option, int arg)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function sets transport options, similar to the way
|
|||
|
|
<function>setsockopt()</function> and <function>ioctl()</function> work.
|
|||
|
|
The parameter <parameter>connection</parameter> is an endpoint
|
|||
|
|
that was obtained from _XTransOpen*() functions. The parameter
|
|||
|
|
<parameter>option</parameter> contains the option that will be set. The actual
|
|||
|
|
values for option are defined in a later section. The parameter
|
|||
|
|
<parameter>arg</parameter> can be used to pass in an additional value that may
|
|||
|
|
be required by some options. This function return 0 on
|
|||
|
|
success and -1 on failure.
|
|||
|
|
</para>
|
|||
|
|
<note><para>
|
|||
|
|
Based on current usage, the complimentary function
|
|||
|
|
<function>TRANS(GetOption)</function> is not necessary.
|
|||
|
|
</para></note>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(CreateListener)(XtransConnInfo connection, char *port, int flags)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function sets up the server endpoint for listening. The parameter
|
|||
|
|
<parameter>connection</parameter> is an endpoint that was obtained from
|
|||
|
|
<function>TRANS(OpenCOTSServer)()</function> or
|
|||
|
|
<function>TRANS(OpenCLTSServer)()</function>. The parameter
|
|||
|
|
<parameter>port</parameter> specifies the
|
|||
|
|
port to which this endpoint should be bound for listening. If port is NULL,
|
|||
|
|
then the transport may attempt to allocate any available TSAP for this
|
|||
|
|
connection. If the transport cannot support this, then this function will
|
|||
|
|
return a failure. The <parameter>flags</parameter> parameter can be set
|
|||
|
|
to <symbol>ADDR_IN_USE_ALLOWED</symbol> to allow the call to the underlying
|
|||
|
|
binding function to fail with a <errorname>EADDRINUSE</errorname> error
|
|||
|
|
without causing the <function>TRANS(CreateListener)</function>
|
|||
|
|
function itself to fail. This function return 0 on success and -1 on failure.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(ResetListener)(XtransConnInfo connection)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
When a server is restarted, certain listen ports may need to be reset.
|
|||
|
|
For example, unix domain needs to check that the file used for
|
|||
|
|
communication has not been deleted. If it has, it must be recreated.
|
|||
|
|
The parameter <parameter>connection</parameter> is an opened and bound
|
|||
|
|
endpoint that was obtained from <function>TRANS(OpenCOTSServer)()</function>
|
|||
|
|
and passed to <function>TRANS(CreateListener)()</function>.
|
|||
|
|
This function will return one of the following values:
|
|||
|
|
<symbol>TRANS_RESET_NOOP</symbol>,
|
|||
|
|
<symbol>TRANS_RESET_NEW_FD</symbol>, or
|
|||
|
|
<symbol>TRANS_RESET_FAILURE</symbol>.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
XtransConnInfo TRANS(Accept)(XtransConnInfo connection)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
Once a connection indication is received, this function can be called to
|
|||
|
|
accept the connection. The parameter <parameter>connection</parameter> is
|
|||
|
|
an opened and bound endpoint that was obtained from
|
|||
|
|
<function>TRANS(OpenCOTSServer)()</function> and passed to
|
|||
|
|
<function>TRANS(CreateListener)()</function>. This function will return a
|
|||
|
|
new opaque transport connection object upon success, NULL otherwise.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(Connect)(XtransConnInfo connection, char *address)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function creates a connection to a server. The parameter
|
|||
|
|
<parameter>connection</parameter> is an endpoint that was obtained
|
|||
|
|
from <function>TRANS(OpenCOTSClient)()</function>. The parameter
|
|||
|
|
<parameter>address</parameter> specifies the TSAP to which this endpoint
|
|||
|
|
should connect. If the
|
|||
|
|
protocol is included in the address, it will be ignored. This function
|
|||
|
|
return 0 on success and -1 on failure.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(BytesReadable)(XtransConnInfo connection, BytesReadable_t *pend);
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function provides the same functionality as the BytesReadable macro.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(Read)(XtransConnInfo connection, char *buf, int size)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function will return the number of bytes requested on a COTS
|
|||
|
|
connection, and will return the minimum of the number bytes requested or
|
|||
|
|
the size of the incoming packet on a CLTS connection.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(Write)(XtransConnInfo connection, char *buf, int size)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function will write the requested number of bytes on a COTS
|
|||
|
|
connection, and will send a packet of the requested size on a CLTS connection.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(Readv)(XtransConnInfo connection, struct iovec *buf, int size)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
Similar to <function>TRANS(Read)()</function>.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(Writev)(XtransConnInfo connection, struct iovec *buf, int size)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
Similar to <function>TRANS(Write)()</function>.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(Disconnect)(XtransConnInfo connection)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function is used when an orderly disconnect is desired. This function
|
|||
|
|
breaks the connection on the transport. It is similar to the socket function
|
|||
|
|
<function>shutdown()</function>.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(Close)(XtransConnInfo connection)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function closes the transport, unbinds it, and frees all resources that
|
|||
|
|
was associated with the transport. If a <function>TRANS(Disconnect)</function>
|
|||
|
|
call was not made on the connection, a disorderly disconnect may occur.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(IsLocal)(XtransConnInfo connection)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
Returns TRUE if it is a local transport.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(GetMyAddr)(XtransConnInfo connection, int *familyp, int *addrlenp,
|
|||
|
|
Xtransaddr **addrp)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function is similar to
|
|||
|
|
<function>getsockname()</function>.
|
|||
|
|
This function will allocate space for the address, so it must be freed by
|
|||
|
|
the caller. Not all transports will have a valid address until a connection
|
|||
|
|
is established. This function should not be used until the connection is
|
|||
|
|
established with
|
|||
|
|
<function>Connect()</function> or
|
|||
|
|
<function>Accept()</function>.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(GetPeerAddr)(XtransConnInfo connection, int *familyp, int *addrlenp,
|
|||
|
|
Xtransaddr **addrp)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function is similar to
|
|||
|
|
<function>getpeername()</function>.
|
|||
|
|
This function will allocate space for the address, so it must be freed by
|
|||
|
|
the caller. Not all transports will have a valid address until a connection
|
|||
|
|
is established. This function should not be used until the connection is
|
|||
|
|
established with
|
|||
|
|
<function>Connect()</function> or
|
|||
|
|
<function>Accept()</function>.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(GetConnectionNumber)(XtransConnInfo connection)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
Returns the file descriptor associated with this transport.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(MakeAllCOTSServerListeners)(char *port, int *partial_ret,
|
|||
|
|
int *count_ret, XtransConnInfo **connections_ret)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function should be used by most servers. It will try to establish
|
|||
|
|
a COTS server endpoint for each transport listed in the transport table.
|
|||
|
|
<parameter>partial_ret</parameter> will be set to <symbol>True</symbol> if
|
|||
|
|
only a partial network could be created. <parameter>count_ret</parameter> is
|
|||
|
|
the number of transports returned, and <parameter>connections_ret</parameter>
|
|||
|
|
is the list of transports.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(MakeAllCLTSServerListeners)( char *port, int *partial_ret,
|
|||
|
|
int *count_ret, XtransConnInfo **connections_ret)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function should be used by most servers. It will try to establish a
|
|||
|
|
CLTS server endpoint for each transport listed in the transport table.
|
|||
|
|
<parameter>partial_ret</parameter> will be set to <symbol>True</symbol> if
|
|||
|
|
only a partial network could be created. <parameter>count_ret</parameter> is
|
|||
|
|
the number of transports returned, and <parameter>connections_ret</parameter>
|
|||
|
|
is the list of transports.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
</itemizedlist>
|
|||
|
|
</sect1>
|
|||
|
|
|
|||
|
|
<sect1 id="utility_api">
|
|||
|
|
<title>Utility API</title>
|
|||
|
|
<para>
|
|||
|
|
This section describes a few useful functions that have been implemented on
|
|||
|
|
top of the Core Interface API. These functions are being provided as a
|
|||
|
|
convenience.
|
|||
|
|
</para>
|
|||
|
|
<itemizedlist mark='bullet'>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int TRANS(ConvertAddress)(int *familyp, int *addrlenp, Xtransaddr *addrp)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function converts a sockaddr based address to an X authorization based
|
|||
|
|
address (ie AF_INET, AF_UNIX to the X protocol definition (ie FamilyInternet,
|
|||
|
|
FamilyLocal)).
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
</itemizedlist>
|
|||
|
|
</sect1>
|
|||
|
|
</chapter>
|
|||
|
|
|
|||
|
|
<chapter id="transport_option_definition">
|
|||
|
|
<title>Transport Option Definition</title>
|
|||
|
|
<para>
|
|||
|
|
The following options are defined for the
|
|||
|
|
<function>TRANS(SetOption)()</function>
|
|||
|
|
function. If an OS or transport does not support any of these options,
|
|||
|
|
then it will silently ignore the option.
|
|||
|
|
</para>
|
|||
|
|
|
|||
|
|
<itemizedlist mark='bullet'>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
<symbol>TRANS_NONBLOCKING</symbol>
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This option controls the blocking mode of the connection. If the argument
|
|||
|
|
is set to 1, then the connection will be set to blocking. If the argument
|
|||
|
|
is set to 0, then the connection will be set to non- blocking.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
<symbol>TRANS_CLOSEONEXEC</symbol>
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This option determines what will happen to the connection when an exec is
|
|||
|
|
encountered. If the argument is set to 1, then the connection will be
|
|||
|
|
closed when an exec occurs. If the argument is set to 0, then the
|
|||
|
|
connection will not be closed when an exec occurs.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
</itemizedlist>
|
|||
|
|
</chapter>
|
|||
|
|
|
|||
|
|
<chapter id="hidden_transport_dependent_api">
|
|||
|
|
<title>Hidden Transport Dependent API</title>
|
|||
|
|
<para>
|
|||
|
|
The hidden transport dependent functions are placed in the Xtransport record.
|
|||
|
|
These function are similar to the Exposed Transport Independent API, but
|
|||
|
|
some of the parameters and return values are slightly different. Stuff like
|
|||
|
|
the <code>#ifdef SUNSYSV</code> should be handled inside these functions.
|
|||
|
|
</para>
|
|||
|
|
|
|||
|
|
<itemizedlist mark='bullet'>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
XtransConnInfo *OpenCOTSClient (
|
|||
|
|
struct _Xtransport *thistrans, char *protocol, char *host, char *port)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function creates a Connection-Oriented Transport. The parameter
|
|||
|
|
<parameter>thistrans</parameter>
|
|||
|
|
points to an Xtransport entry in the transport table. The parameters
|
|||
|
|
<parameter>protocol</parameter>,
|
|||
|
|
<parameter>host</parameter>, and
|
|||
|
|
<parameter>port</parameter>, point to strings containing the corresponding
|
|||
|
|
parts of the address that was passed into <function>TRANS(OpenCOTSClient)()</function>.
|
|||
|
|
This function must allocate and initialize the contents of the XtransConnInfo
|
|||
|
|
structure that is returned by this function. This function will open the
|
|||
|
|
transport, and bind it into the transport namespace if applicable. The local
|
|||
|
|
address portion of the XtransConnInfo structure will also be filled in by
|
|||
|
|
this function.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
XtransConnInfo *OpenCOTSServer (
|
|||
|
|
struct _Xtransport *thistrans, char *protocol, char *host, char *port)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function creates a Connection-Oriented Transport. The parameter
|
|||
|
|
<parameter>thistrans</parameter>
|
|||
|
|
points to an Xtransport entry in the transport table. The
|
|||
|
|
parameters
|
|||
|
|
<parameter>protocol</parameter>,
|
|||
|
|
<parameter>host</parameter>, and
|
|||
|
|
<parameter>port</parameter> point to strings containing the
|
|||
|
|
corresponding parts of the address that was passed into
|
|||
|
|
<function>TRANS(OpenCOTSClient)()</function>.
|
|||
|
|
This function must allocate and initialize the contents of the
|
|||
|
|
XtransConnInfo structure that is returned by this function. This function
|
|||
|
|
will open the transport.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
XtransConnInfo *OpenCLTSClient (
|
|||
|
|
struct _Xtransport *thistrans, char *protocol, char *host, char *port)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function creates a Connection-Less Transport. The parameter
|
|||
|
|
<parameter>thistrans</parameter>
|
|||
|
|
points to an Xtransport entry in the transport table. The parameters
|
|||
|
|
<parameter>protocol</parameter>,
|
|||
|
|
<parameter>host</parameter>, and
|
|||
|
|
<parameter>port</parameter> point to strings containing the
|
|||
|
|
corresponding parts of the address that was passed into
|
|||
|
|
<function>TRANS(OpenCOTSClient)()</function>.
|
|||
|
|
This function must allocate and initialize the contents of the XtransConnInfo
|
|||
|
|
structure that is returned by this function. This function will open the
|
|||
|
|
transport, and bind it into the transport namespace if applicable. The
|
|||
|
|
local address portion of the XtransConnInfo structure will also be filled
|
|||
|
|
in by this function.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
XtransConnInfo *OpenCLTSServer (
|
|||
|
|
struct _Xtransport *thistrans, char *protocol, char *host, char *port)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function creates a Connection-Less Transport. The parameter
|
|||
|
|
<parameter>thistrans</parameter>
|
|||
|
|
points to an Xtransport entry in the transport table. The parameters
|
|||
|
|
<parameter>protocol</parameter>,
|
|||
|
|
<parameter>host</parameter>, and
|
|||
|
|
<parameter>port</parameter> point to strings containing the
|
|||
|
|
corresponding parts of the address that was passed into
|
|||
|
|
<function>TRANS(OpenCOTSClient)()</function>.
|
|||
|
|
This function must allocate and initialize the contents of the
|
|||
|
|
XtransConnInfo structure that is returned by this function. This
|
|||
|
|
function will open the transport.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int SetOption (struct _Xtransport *thistrans, int option, int arg)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function provides a transport dependent way of implementing the
|
|||
|
|
options defined by the X Transport Interface. In the current prototype,
|
|||
|
|
this function is not being used, because all of the options defined so far
|
|||
|
|
are transport independent. This function will have to be used if a radically
|
|||
|
|
different transport type is added, or a transport dependent option is defined.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int CreateListener (struct _Xtransport *thistrans, char *port, int flags )
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function takes a transport endpoint opened for a server, and sets it
|
|||
|
|
up to listen for incoming connection requests. The parameter
|
|||
|
|
<parameter>port</parameter>
|
|||
|
|
contains the port portion of the address that was passed to the Open function.
|
|||
|
|
The parameter <parameter>flags</parameter> should be set to
|
|||
|
|
<symbol>ADDR_IN_USE_ALLOWED</symbol> if the underlying transport endpoint
|
|||
|
|
may be already bound and this should not be considered
|
|||
|
|
as an error. Otherwise flags should be set to 0. This is used by IPv6 code,
|
|||
|
|
where the same socket can be bound to both an IPv6 address and then to a
|
|||
|
|
IPv4 address. This function will bind the transport into the transport
|
|||
|
|
name space if applicable, and fill in the local address portion of the
|
|||
|
|
XtransConnInfo structure. The transport endpoint will then be set to
|
|||
|
|
listen for incoming connection requests.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int ResetListener (struct _Xtransport *thistrans)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function resets the transport for listening.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
XtransConnInfo Accept(struct _Xtransport *thistrans)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function creates a new transport endpoint as a result of an
|
|||
|
|
incoming connection request. The parameter
|
|||
|
|
<parameter>thistrans</parameter> is the endpoint
|
|||
|
|
that was opened for listening by the server. The new endpoint is
|
|||
|
|
opened and bound into the transport’s namespace. A XtransConnInfo
|
|||
|
|
structure describing the new endpoint is returned from this function
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int Connect(struct _Xtransport *thistrans, char *host, char *port )
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function establishes a connection to a server. The parameters
|
|||
|
|
<parameter>host</parameter> and
|
|||
|
|
<parameter>port</parameter>
|
|||
|
|
describe the server to which the connection should be
|
|||
|
|
established. The connection will be established so that
|
|||
|
|
<function>Read()</function> and
|
|||
|
|
<function>Write()</function> call can be made.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int BytesReadable(struct _Xtransport *thistrans, BytesReadable_t *pend )
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function replaces the
|
|||
|
|
<function>BytesReadable()</function>
|
|||
|
|
macro. This allows each transport to have it’s own mechanism for determining
|
|||
|
|
how much data is ready to be read.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int Read(struct _Xtransport *thistrans, char *buf, int size )
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function reads size bytes into buf from the connection.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int Write(struct _Xtransport *thistrans, char *buf, int size )
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function writes size bytes from buf to the connection.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int Readv(struct _Xtransport *thistrans, struct iovec *buf, int size )
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function performs a <function>readv()</function> on the connection.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int Writev(struct _Xtransport *thistrans, struct iovec *buf, int size )
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function performs a <function>writev()</function> on the connection.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int Disconnect(struct _Xtransport *thistrans)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function initiates an orderly shutdown of a connection. If a
|
|||
|
|
transport does not distinguish between orderly and disorderly
|
|||
|
|
disconnects, then a call to this function will have no affect.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
<listitem>
|
|||
|
|
<para>
|
|||
|
|
int Close(struct _Xtransport *thistrans)
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
This function will break the connection, and close the endpoint.
|
|||
|
|
</para>
|
|||
|
|
</listitem>
|
|||
|
|
</itemizedlist>
|
|||
|
|
</chapter>
|
|||
|
|
<chapter id="configuration">
|
|||
|
|
<title>Configuration</title>
|
|||
|
|
|
|||
|
|
<para>
|
|||
|
|
The implementation of each transport can be platform specific. It is expected
|
|||
|
|
that existing connection types such as <symbol>TCPCONN</symbol>,
|
|||
|
|
<symbol>UNIXCONN</symbol>, <symbol>LOCALCONN</symbol>, and
|
|||
|
|
<symbol>STREAMSCONN</symbol> will be replaced with flags for each
|
|||
|
|
possible transport type.
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
In X11R6, the below flags to enable transport types were set in
|
|||
|
|
<symbol>ConnectionFlags</symbol> in the <filename>vendor.cf</filename> or
|
|||
|
|
<filename>site.def</filename> config files.
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
In X11R7 modular releases, these flags are set when running
|
|||
|
|
<filename>configure</filename> scripts which include the
|
|||
|
|
<function>XTRANS_CONNECTION_FLAGS</function> macro from
|
|||
|
|
<filename>xtrans.m4</filename>.
|
|||
|
|
</para>
|
|||
|
|
<informaltable pgwide='0' frame='none'>
|
|||
|
|
<tgroup cols='4' align='left'>
|
|||
|
|
<colspec colname='define' align='center'/>
|
|||
|
|
<colspec colname='enable'/>
|
|||
|
|
<colspec colname='desc'/>
|
|||
|
|
<thead>
|
|||
|
|
<row>
|
|||
|
|
<entry><code>#define</code></entry>
|
|||
|
|
<entry>configure flag</entry>
|
|||
|
|
<entry>Description</entry>
|
|||
|
|
</row>
|
|||
|
|
</thead>
|
|||
|
|
<tbody>
|
|||
|
|
<row>
|
|||
|
|
<entry><symbol>TCPCONN</symbol></entry>
|
|||
|
|
<entry><option>--enable-tcp-transport</option></entry>
|
|||
|
|
<entry>
|
|||
|
|
Enables the INET (IPv4) Domain Socket based transport
|
|||
|
|
</entry>
|
|||
|
|
</row>
|
|||
|
|
<row>
|
|||
|
|
<entry><symbol>IPv6</symbol></entry>
|
|||
|
|
<entry><option>--enable-ipv6</option></entry>
|
|||
|
|
<entry>
|
|||
|
|
Extends <symbol>TCPCONN</symbol> to enable IPv6 Socket based transport
|
|||
|
|
</entry>
|
|||
|
|
</row>
|
|||
|
|
<row>
|
|||
|
|
<entry><symbol>UNIXCONN</symbol></entry>
|
|||
|
|
<entry><option>--enable-unix-transport</option></entry>
|
|||
|
|
<entry>
|
|||
|
|
Enables the UNIX Domain Socket based transport
|
|||
|
|
</entry>
|
|||
|
|
</row>
|
|||
|
|
<row>
|
|||
|
|
<entry><symbol>STREAMSCONN</symbol></entry>
|
|||
|
|
<entry><emphasis>Not available in X11R7</emphasis></entry>
|
|||
|
|
<entry>
|
|||
|
|
Enables the TLI based transports
|
|||
|
|
</entry>
|
|||
|
|
</row>
|
|||
|
|
<row>
|
|||
|
|
<entry><symbol>LOCALCONN</symbol></entry>
|
|||
|
|
<entry><option>--enable-local-transport</option></entry>
|
|||
|
|
<entry>
|
|||
|
|
Enables the SYSV Local connection transports
|
|||
|
|
</entry>
|
|||
|
|
</row>
|
|||
|
|
<row>
|
|||
|
|
<entry><symbol>DNETCONN</symbol></entry>
|
|||
|
|
<entry><emphasis>Not available in X11R7</emphasis></entry>
|
|||
|
|
<entry>
|
|||
|
|
Enables the DECnet transports
|
|||
|
|
</entry>
|
|||
|
|
</row>
|
|||
|
|
</tbody>
|
|||
|
|
</tgroup>
|
|||
|
|
</informaltable>
|
|||
|
|
|
|||
|
|
|
|||
|
|
</chapter>
|
|||
|
|
|
|||
|
|
<chapter id="transport_specific_definitions">
|
|||
|
|
<title>Transport Specific Definitions</title>
|
|||
|
|
|
|||
|
|
<informaltable pgwide='0' frame='none'>
|
|||
|
|
<tgroup cols='4' align='center'>
|
|||
|
|
<colspec colname='c1'/>
|
|||
|
|
<colspec colname='c2'/>
|
|||
|
|
<colspec colname='c3'/>
|
|||
|
|
<colspec colname='c4'/>
|
|||
|
|
<thead>
|
|||
|
|
<row>
|
|||
|
|
<entry morerows="1" align='center'>Protocol Family</entry>
|
|||
|
|
<entry namest="c2" nameend="c4" align='center'>Address Component</entry>
|
|||
|
|
</row>
|
|||
|
|
<row>
|
|||
|
|
<entry align='center'>protocol</entry>
|
|||
|
|
<entry align='center'>host</entry>
|
|||
|
|
<entry align='center'>port</entry>
|
|||
|
|
</row>
|
|||
|
|
</thead>
|
|||
|
|
<tbody>
|
|||
|
|
<row>
|
|||
|
|
<entry align='center'>Internet</entry>
|
|||
|
|
<entry align='center'>inet inet6 tcp udp</entry>
|
|||
|
|
<entry align='center'>name of an internet addressable host</entry>
|
|||
|
|
<entry align='center'>string containing the name of a service or a valid port number. Example: "xserver0", "7100"</entry>
|
|||
|
|
</row>
|
|||
|
|
<row>
|
|||
|
|
<entry align='center'>DECnet</entry>
|
|||
|
|
<entry align='center'>decnet</entry>
|
|||
|
|
<entry align='center'>name of a DECnet addressable host</entry>
|
|||
|
|
<entry align='center'>string containing the complete name of the object. Example: "X$X0"</entry>
|
|||
|
|
</row>
|
|||
|
|
<row>
|
|||
|
|
<entry align='center'>NETware</entry>
|
|||
|
|
<entry align='center'>ipx</entry>
|
|||
|
|
<entry align='center'>name of a NETware addressable host</entry>
|
|||
|
|
<entry align='center'>Not sure of the specifics yet.</entry>
|
|||
|
|
</row>
|
|||
|
|
<row>
|
|||
|
|
<entry align='center'>OSI</entry>
|
|||
|
|
<entry align='center'>osi</entry>
|
|||
|
|
<entry align='center'>name of an OSI adressable host.</entry>
|
|||
|
|
<entry align='center'>Not sure of the specifics yet.</entry>
|
|||
|
|
</row>
|
|||
|
|
<row>
|
|||
|
|
<entry align='center'>Local</entry>
|
|||
|
|
<entry align='center'>local pts named sco isc</entry>
|
|||
|
|
<entry align='center'>(ignored)</entry>
|
|||
|
|
<entry align='center'>String containing the port name, ie "xserver0", "fontserver0".</entry>
|
|||
|
|
</row>
|
|||
|
|
</tbody>
|
|||
|
|
</tgroup>
|
|||
|
|
</informaltable>
|
|||
|
|
|
|||
|
|
</chapter>
|
|||
|
|
|
|||
|
|
<chapter id="implementation_notes">
|
|||
|
|
<title>Implementation Notes</title>
|
|||
|
|
<para>
|
|||
|
|
This section refers to the prototype implementation that is being developed
|
|||
|
|
concurrently with this document. This prototype has been able to flush out many
|
|||
|
|
details and problems as the specification was being developed.
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
In X11R6, all of the source code for this interface was located in
|
|||
|
|
<filename>xc/lib/xtrans</filename>.
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
In X11R7, all of the source code for this interface is delivered via
|
|||
|
|
the <systemitem>lib/libxtrans</systemitem> modular package from X.Org,
|
|||
|
|
and is installed under
|
|||
|
|
<filename><replaceable>${prefix}</replaceable>/X11/Xtrans</filename>
|
|||
|
|
so that other modules may find it when they build.
|
|||
|
|
</para>
|
|||
|
|
<para>
|
|||
|
|
All functions names in the source are of the format
|
|||
|
|
<function>TRANS(func)()</function>. The
|
|||
|
|
<function>TRANS()</function>
|
|||
|
|
macro is defined as
|
|||
|
|
<programlisting language="C">
|
|||
|
|
#if (__STDC__ && !defined(UNIXCPP)) || defined(ANSICPP)
|
|||
|
|
#define TRANS(func) _PROTOCOLTrans##func
|
|||
|
|
#else
|
|||
|
|
#define TRANS(func) _PROTOCOLTrans/**/func
|
|||
|
|
#endif
|
|||
|
|
</programlisting>
|
|||
|
|
</para>
|
|||
|
|
|
|||
|
|
<para>
|
|||
|
|
<symbol>PROTOCOL</symbol> will be uniquely defined in each directory
|
|||
|
|
where this code is compiled.
|
|||
|
|
<symbol>PROTOCOL</symbol> will be defined to be the name of the protocol
|
|||
|
|
that is implemented by the library or server, such as X11, FS, and ICE.
|
|||
|
|
</para>
|
|||
|
|
|
|||
|
|
<para>
|
|||
|
|
All libraries and servers that use the X Transport Interface should have a new
|
|||
|
|
file called <filename><replaceable>TRANSPORT</replaceable>trans.c</filename>.
|
|||
|
|
This file will include the transports based on the configuration flags
|
|||
|
|
provided by the <filename>configure</filename> script. Below is an
|
|||
|
|
example <filename>xfstrans.c</filename> for the font server.
|
|||
|
|
</para>
|
|||
|
|
|
|||
|
|
<programlisting language="C">
|
|||
|
|
#include "config.h"
|
|||
|
|
|
|||
|
|
#define FONT_t 1
|
|||
|
|
#define TRANS_REOPEN 1
|
|||
|
|
#define TRANS_SERVER 1
|
|||
|
|
|
|||
|
|
#include <X11/Xtrans/transport.c>
|
|||
|
|
</programlisting>
|
|||
|
|
<para>
|
|||
|
|
The source files for this interface are listed below.
|
|||
|
|
</para>
|
|||
|
|
|
|||
|
|
<variablelist>
|
|||
|
|
<varlistentry>
|
|||
|
|
<term><filename>Xtrans.h</filename></term>
|
|||
|
|
<listitem><para>
|
|||
|
|
Function prototypes and defines for the Transport Independent API.
|
|||
|
|
</para></listitem>
|
|||
|
|
</varlistentry>
|
|||
|
|
<varlistentry>
|
|||
|
|
<term><filename>Xtransint.h</filename></term>
|
|||
|
|
<listitem><para>
|
|||
|
|
Used by the interface implementation only.
|
|||
|
|
Contains the internal data structures.
|
|||
|
|
</para></listitem>
|
|||
|
|
</varlistentry>
|
|||
|
|
<varlistentry>
|
|||
|
|
<term><filename>Xtranssock.c</filename></term>
|
|||
|
|
<listitem><para>
|
|||
|
|
Socket implementation of the Transport Dependent API.
|
|||
|
|
</para></listitem>
|
|||
|
|
</varlistentry>
|
|||
|
|
<varlistentry>
|
|||
|
|
<term><filename>Xtranstli.c</filename></term>
|
|||
|
|
<listitem><para>
|
|||
|
|
TLI implementation of the Transport Dependent API.
|
|||
|
|
</para></listitem>
|
|||
|
|
</varlistentry>
|
|||
|
|
<varlistentry>
|
|||
|
|
<term><filename>Xtransdnet.c</filename></term>
|
|||
|
|
<listitem><para>
|
|||
|
|
DECnet implementation of the Transport Dependent API.
|
|||
|
|
</para></listitem>
|
|||
|
|
</varlistentry>
|
|||
|
|
<varlistentry>
|
|||
|
|
<term><filename>Xtranslocal.c</filename></term>
|
|||
|
|
<listitem><para>
|
|||
|
|
Implementation of the Transport Dependent API for SYSV Local connections.
|
|||
|
|
</para></listitem>
|
|||
|
|
</varlistentry>
|
|||
|
|
<varlistentry>
|
|||
|
|
<term><filename>Xtrans.c</filename></term>
|
|||
|
|
<listitem><para>
|
|||
|
|
Exposed Transport Independent API Functions.
|
|||
|
|
</para></listitem>
|
|||
|
|
</varlistentry>
|
|||
|
|
<varlistentry>
|
|||
|
|
<term><filename>Xtransutil.c</filename></term>
|
|||
|
|
<listitem><para>
|
|||
|
|
Collection of Utility functions that use the X Transport Interface.
|
|||
|
|
</para></listitem>
|
|||
|
|
</varlistentry>
|
|||
|
|
</variablelist>
|
|||
|
|
|
|||
|
|
|
|||
|
|
<para>
|
|||
|
|
The file <filename>Xtransint.h</filename> contains much of the transport
|
|||
|
|
related code that was previously in <filename>Xlibint.h</filename> and
|
|||
|
|
<filename>Xlibnet.h</filename>.
|
|||
|
|
This will make the definitions available for all transport users. This
|
|||
|
|
should also obsolete the equivalent code in other libraries.
|
|||
|
|
</para>
|
|||
|
|
|
|||
|
|
</chapter>
|
|||
|
|
</book>
|