| CAE Specification |
|---|
| Networking Services (XNS) Issue 5 |
| X/Open Document Number: C523 |
| ISBN: 1-85912-165-9 |
©February 1997, The Open Group All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the copyright owners.
Portions of this document are extracted from IEEE Std 1003.1-1990, copyright © 1990 by the Institute of Electrical and Electronics Engineers, Inc. with the permission of the IEEE.
Portions of this document were extracted from IEEE Draft Standard P1003.2/D12, copyright © 1992 by the Institute of Electrical and Electronics Engineers, Inc. with the permission of the IEEE. No further reproduction of this material is permitted without the written permission of the publisher. IEEE Std 1003.2-1992, copyright © 1992 by the Institute of Electrical and Electronics Engineers, Inc., and ISO/IEC 9945-2:1993, Information Technology - Portable Operating System (POSIX) - Part 2: Shell and Utilities, are technically identical to IEEE Draft Standard P1003.2/D12 in these areas.
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The Networking Services (XNS) specification describes the industry-standard Open Systems interfaces to communications services. These include two APIs to transport-level process-to-process communications: Sockets and XTI. Both Sockets and XTI are specified for use over Internet protocols (TCP, UDP and IP) and ISO Transport protocols. They also include a set of Internet address resolution interfaces which are commonly used in conjunction with Sockets. XTI support for many other protocols is described in appendices to XNS.
This XNS Issue 5 is one of the UNIX98 specifications. Branded UNIX98 systems support the Sockets, XTI and Address Resolution interfaces described in XNS Issue 5. Sockets and Address Resolution must be supported over the Internet protocols. XTI may be supported over either the Internet or ISO Transport protocols. Other protocols may also be provided, but this is not required for the Brand.
XNS Issue 5 contains a number of new features over the previous publication1. The most important new feature is the removal of implicit data length assumptions (for example, that an item of type int is 32 bits long). This enables the XNS APIs to be used effectively on new computer architectures with 64-bit (or larger) word lengths. Other new features include:
XNS Issue 5 includes revisions to align with the IEEE Standard 1003.1: 1990 (Portable Operating System Interface). At the time of publication, the IEEE project P1003.1g is considering draft extensions, and their current draft includes some aspects with which XNS can not align (for example, it still makes implicit data length assumptions). Attempts are being made in P1003.1g to seek alignment with XNS Issue 5.
AT&T® is a registered trademark of AT&T in the U.S.A. and other countries.
Hewlett-PackardTM; is a trademark and HP® is a registered trademark of Hewlett-Packard Company.
Motif®, OSF/1®, and UNIX® are registered trademarks and the IT DialToneTM;, The Open GroupTM;, and the "X Device"TM; are trademarks of The Open Group.
SNA is a product of International Business Machines Corporation.
/usr/group® is a registered trademark of UniForum, the International Network of UNIX System Users.
| Josee Auber | Hewlett-Packard |
| Kathryn Britton | IBM |
| Philippe Camus | Groupe Bull |
| Andrew Chandler | ICL |
| Andre Cohen | Groupe Bull |
| Paul Comstock | Hewlett-Packard |
| Andrew Gollan | Sun |
| Michel Habert | Groupe Bull |
| Torez Hiley | USL |
| Martin Jess | NCR |
| Mukesh Kacker | Sun |
| Gerhard Kieselmann | SNI |
| David Laight | Fujitsu/ICL |
| Jack McCann | DIGITAL |
| Hiroshi Maruta | Hitachi |
| Lori Mickelson | Unisys |
| Laura Micks | IBM |
| Finnbarr Murphy | DIGITAL |
| Alagu Periyannan | Apple |
| George Preoteasa | Hewlett-Packard |
| John Ronciak | Unisys |
| Seth Rosenthal | Novell |
| Eric Scoredos | Hewlett-Packard |
| Maria Stanley | DIGITAL |
| Lutz Temme | SNI |
| Roger Turner | IBM |
| Keith Weir | ICL |
| Robert Weirick | Unisys |
| Greg Wiley | SFC (SCO) |
| Isaac Wong | Hewlett-Packard |
Amendment 3:1992 to ISO 8327:1987 - Additional Synchronization Functionality.
| Connection-Oriented | ||
|---|---|---|
| Protocol Definition | IS 8073-1986 | IS 8602 |
| Service Definition | IS 8072-1986 | IS 8072/Add.1-1986 |
Also see TCP, Transmission Control Protocol, Military Standard, Mil-std-1778, Defense Communication Agency, DDN Protocol Handbook, Volume I, DOD Military Standard Protocols (December 1985).
| Contents | Next section | Index |