Application Programmer's I/O Guide

Document Number: 007-3695-004

St. Peter's Basilica image courtesy of ENEL SpA and InfoByte SpA. Disk Thrower image courtesy of Xavier Berenguer, Animatica.

Copyright © 1994, 1995, 1997-1999 Silicon Graphics, Inc. All Rights Reserved. This manual or parts thereof may not be reproduced in any form unless permitted by contract or by written permission of Silicon Graphics, Inc.


Use, duplication, or disclosure by the Government is subject to restrictions as set forth in the Rights in Data clause at FAR 52.227-14 and/or in similar or successor clauses in the FAR, or in the DOD, DOE or NASA FAR Supplements. Unpublished rights reserved under the Copyright Laws of the United States. Contractor/manufacturer is Silicon Graphics, Inc., 1600 Amphitheatre Pkwy., Mountain View, CA 94043-1351.

Autotasking, CF77, CRAY, Cray Ada, CraySoft, CRAY Y-MP, CRAY-1, CRInform, CRI/TurboKiva, HSX, LibSci, MPP Apprentice, SSD, SUPERCLUSTER, UNICOS, X-MP EA, and UNICOS/mk are federally registered trademarks and Because no workstation is an island, CCI, CCMT, CF90, CFT, CFT2, CFT77, ConCurrent Maintenance Tools, COS, Cray Animation Theater, CRAY APP, CRAY C90, CRAY C90D, Cray C++ Compiling System, CrayDoc, CRAY EL, CRAY J90, CRAY J90se, CrayLink, Cray NQS, Cray/REELlibrarian, CRAY S-MP, CRAY SSD-T90, CRAY SV1, CRAY T90, CRAY T3D, CRAY T3E, CrayTutor, CRAY X-MP, CRAY XMS, CRAY-2, CSIM, CVT, Delivering the power . . ., DGauss, Docview, EMDS, GigaRing, HEXAR, IOS, ND Series Network Disk Array, Network Queuing Environment, Network Queuing Tools, OLNET, RQS, SEGLDR, SMARTE, SUPERLINK, System Maintenance and Remote Testing Environment, Trusted UNICOS, and UNICOS MAX are trademarks of Cray Research, Inc., a wholly owned subsidiary of Silicon Graphics, Inc.

IRIX and Silicon Graphics are registered trademarks and the Silicon Graphics logo is a trademark of Silicon Graphics, Inc.

CDC is a trademark of Control Data Systems, Inc. DEC, ULTRIX, VAX, and VMS are trademarks of Digital Equipment Corporation. ER90 is a trademark of EMASS, Inc. ETA is a trademark of ETA Systems, Inc. IBM is a trademark of International Business Machines Corporation. MIPS is a registered trademark and MIPSpro is a trademark of MIPS Technologies, Inc. UNIX is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company Limited. X/Open is a registered trademark of X/Open Company Ltd. X Window System and the X device are trademarks of The Open Group.

The UNICOS operating system is derived from UNIX® System V. The UNICOS operating system is also based in part on the Fourth Berkeley Software Distribution (BSD) under license from The Regents of the University of California.

Record of Revision

Revision 1.0May 1994 
Original Printing. This document incorporates information from the I/O User's Guide, publication SG-3075, and the Advanced I/O User's Guide, publication SG-3076.

Revision 1.2October 1994 
Revised for the Programming Environment 1.2 release.

Revision 2.0November 1995 
Revised for the Programming Environment 2.0 release.

Revision 3.0May 1997 
Revised for the Programming Environment 3.0 release.

Revision 3.0.1August 1997 
Revised for the Programming Environment 3.0.1 release and the MIPSpro 7 Fortran 90 compiler release.

Revision 3.0.2March 1998 
Revised for the Programming Environment 3.0.2 release and the MIPSpro 7 Fortran 90 compiler release.

Revision 3.1August 1998 
Revised for the Programming Environment 3.1 release.

Revision 3.2January 1999 
Revised for the Programming Environment 3.2 release.

Revision 7.3April 1999 
Revised for the MIPSpro 7.3 release.