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SC23-2
First Edition (March 1990)
This edition of the AIX Calls and Subroutines Reference for IBM RISC Systeml6000 applies to IBM AIX
Version 3 for RISC System/6000, Version 3 of IBM AIXwindows EnvironmenV6000, IBM AIX System
Network Architecture Services/SOOO, IBM AIX 3270 Host Connection Program/SOOO, IBM AIX 3278/79
Emulation/SOOO, IBM AIX Network Management/SOOO, and IBM AIX Personal Computer Simulator/SOOO and
to all subsequent releases of these products until otherwise indicated in new releases or technical
newsletters.
The following paragraph does not apply to the United Kingdom or any country where such
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PROVIDES THIS MANUAL "AS IS" WITHOUT WARRANTY OF AN.Y KIND, EITHER EXPRESSED OR
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@) Copyright Adobe Systems, Inc., 1984, 1987
@) Copyright X/Open Company Limited, 1988. All Rights Reserved.
@) Copyright IXI Limited, 1989. All rights reserved.
@) Copyright AT&T, 1984,1985, 1985, 1987, 1988, 1989. All rights reserved.
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forth in FAR 52.227-19(c)(2) or subparagraph (c)(1 )(Ii) of the Rights in Technical Data and Computer
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@) Copyright Carnegie Mellon, 1988. All rights reserved.
@) Copyright Stanford University, 1988. All rights reserved.
Permission to use, copy, modify, and distribute this program for any purpose and without fee is
hereby granted, provided that this copyright and permission notice appear on all copies and
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@) Copyright Sun Microsystems, Inc., 1985, 1986, 1987, 1988. All rights reserved.
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@) Copyright Regents of the University of California, 1986, 1987. All rights reserved.
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@) Copyright INTERACTIVE Systems Corporation 1984. All rights reserved.
@) Copyright 1989, Open Software Foundation, Inc. All rights reserved.
@) Copyright 1987, 1988, 1989, Hewlett-Packard Company. A" rights reserved.
@) Copyright 1988 Microsoft Corporation. All rights reserved.
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@) Copyright Micro Focus, Ltd., 1987, 1990. All rights reserved.
@) Copyright Paul Milazzo, 1984, 1985. All rights reserved.
@) Copyright EG Pup User Process, Paul Kirton, and lSI, 1984. All rights reserved.
@) Copyright Apollo Computer, Inc., 1987. All rights reserved.
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Notice to U.S. Government Users - Documentation Related to Restricted Rights - Use, duplication or
disclosure is subject to restrictions set forth in GSA ADP Schedule Contract with IBM Corporation.
Trademarks and Acknowledgements
The following trademarks and acknowledgements apply to this information:
AIX is a trademark of International Business Machines Corporation.
AIXwindows is a trademark of International Business Machines Corporation.
Apollo is a trademark of Apollo Computer, Inc.
IBM is a registered trademark of International Business Machines Corporation.
NCK is a trademark of Apollo Computer, Inc.
NCS is a trademark of Apollo Computer, Inc.
Network Computing Kernel is a trademark of Apollo Computer, Inc.
Network Computing System is a trademark of Apollo Computer, Inc.
Network File System and NFS are trademarks of Sun Microsystems, Inc.
POSIX is a trademark of the Institute of Electrical and Electronic Engineers (IEEE).
RISC System/6000 is a trademark of International Business Machines Corporation.
SNA 3270 is a trademark of International Business Machines Corporation.
UNIX was developed and licensed by AT&T and is a registered trademark of AT&T
Corporation.
X/OPEN is a trademark of X/OPEN Company Limited.

Note to Users
The term "network information services (NIS)" is now used to refer to the service formerly
known as "Yellow Pages." The functionality remains the same; only the name has changed.
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Telecommunications pic, and may not be used without permission.

Legal Notice to Users Issued by Sun Microsystems, Inc.
"Yellow Pages" is a registered trademark in the United Kingdom of British
Telecommunications pic, and may also be a trademark of various telephone companies
around the world. Sun will be revising future versions of software and documentation to
remove references to "Yellow Pages."

Trademarks V
vi Base Operating System Reference
About This Book
This book, Calls and Subroutines Reference: Base Operating System, provides information
on application programming interfaces to the Advanced Interactive Executive Operating
System (referred to in this text as AIX) for use on the IBM RISC System/6000 System. This
book is part of AIX Calls and Subroutines Reference for IBM RISC System/6000,
SC23-2198, which is divided into the following four major sections: