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Reference numbe

ISO/IEC/IEEE 9945:2009(E)

INTERNATIONAL

STANDARD

ISO/IEC/

IEEE

9945

First edition

2009-09-15

Information technology — Portable

Operating System Interface (POSIX

)

Base Specifications, Issue 7

Technologies de l'information — Spécifications de base de l'interface

pour la portabilité des systèmes (POSIX

), Issue 7

Authorized licensed use limited to: BEIJING UNIVERSITY OF TECHNOLOGY. Downloaded on December 24,2012 at 10:36:04 UTC from IEEE Xplore. Restrictions apply.

ISO/IEC/IEEE 9945:2009(E)

Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical

Commission) form the specialized system for worldwide standardization. National bodies that are members of

ISO or IEC participate in the development of International Standards through technical committees established

by the respective organization to deal with particular fields of technical activity. ISO and IEC technical

committees collaborate in fields of mutual interest. Other international organizations, governmental and non-

governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO

and IEC have established a joint technical committee, ISO/IEC JTC 1.

IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating

Committees of the IEEE Standards Association (IEEE-SA) Standards Board. The IEEE develops its standards

through a consensus development process, approved by the American National Standards Institute, which

brings together volunteers representing varied viewpoints and interests to achieve the final product. Volunteers

are not necessarily members of the Institute and serve without compensation. While the IEEE administers the

process and establishes rules to promote fairness in the consensus development process, the IEEE does not

independently evaluate, test, or verify the accuracy of any of the information contained in its standards.

The main task of ISO/IEC JTC 1 is to prepare International Standards. Draft International Standards adopted

by the joint technical committee are circulated to national bodies for voting. Publication as an International

Standard requires approval by at least 75 % of the national bodies casting a vote.

Attention is called to the possibility that implementation of this standard may require the use of subject matter

covered by patent rights. By publication of this standard, no position is taken with respect to the existence or

validity of any patent rights in connection therewith. ISO/IEEE is not responsible for identifying essential

patents or patent claims for which a license may be required, for conducting inquiries into the legal validity or

scope of patents or patent claims or determining whether any licensing terms or conditions provided in

connection with submission of a Letter of Assurance or a Patent Statement and Licensing Declaration Form, if

any, or in any licensing agreements are reasonable or non-discriminatory. Users of this standard are

expressly advised that determination of the validity of any patent rights, and the risk of infringement of such

rights, is entirely their own responsibility. Further information may be obtained from ISO or the IEEE

Standards Association.

ISO/IEC/IEEE 9945 was prepared by The Open Group (as The Open Group Technical Standard Base

Specifications, Issue 7) and the Portable Applications Standards Committee of the Computer Society of the

IEEE (as IEEE Std 1003.1™-2008). It was adopted by Joint Technical Committee ISO/IEC JTC 1, Information

technology, Subcommittee SC 22, Programming languages, their environments and system software

interfaces, in parallel with its approval by the ISO/IEC national bodies, under the “fast-track procedure” defined

in the Partner Standards Development Organization cooperation agreement between ISO and IEEE. IEEE is

responsible for the maintenance of this document with participation and input from ISO/IEC national bodies.

This first edition of ISO/IEC/IEEE 9945 cancels and replaces ISO/IEC 9945-1:2003, ISO/IEC 9945-2:2003,

ISO/IEC 9945-3:2003 and ISO/IEC 9945-4:2003, which have been technically revised. It also

incorporates the Technical Corrigenda ISO/IEC 9945-1:2003/Cor.1:2004, ISO/IEC 9945-2:2003/Cor.1:2004,

ISO/IEC 9945-3:2003/Cor.1:2004 and ISO/IEC 9945-4:2003/Cor.1:2004.

Authorized licensed use limited to: BEIJING UNIVERSITY OF TECHNOLOGY. Downloaded on December 24,2012 at 10:36:04 UTC from IEEE Xplore. Restrictions apply.