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+.. comment SPDX-License-Identifier: CC-BY-SA-4.0
+
+.. COMMENT: COPYRIGHT (c) 1988-2002.
+.. COMMENT: On-Line Applications Research Corporation (OAR).
+.. COMMENT: All rights reserved.
+
+Preface
+#######
+
+This is the User's Guide for the POSIX API support provided in RTEMS.
+
+The functionality described in this document is based on the following
+standards:
+
+- POSIX 1003.1b-1993.
+
+- POSIX 1003.1h/D3.
+
+- Open Group Single UNIX Specification.
+
+Much of the POSIX API standard is actually implemented in the Cygnus Newlib
+ANSI C Library. Please refer to documentation on Newlib for more information
+on the functionality it supplies.
+
+This manual is still under construction and improvements are welcomed from
+users.
+
+Acknowledgements
+================
+
+The RTEMS Project has been granted permission from The Open Group IEEE to
+excerpt and use portions of the POSIX standards documents in the RTEMS POSIX
+API User's Guide and RTEMS Shell User's Guide. We have to include a specific
+acknowledgement paragraph in these documents (e.g. preface or copyright page)
+and another slightly different paragraph for each manual page that excerpts and
+uses text from the standards.
+
+This file should help ensure that the paragraphs are consistent and not
+duplicated
+
+ The Institute of Electrical and Electronics Engineers, Inc and The Open
+ Group, have given us permission to reprint portions of their documentation.
+ Portions of this text are reprinted and reproduced in electronic form from
+ IEEE Std 1003.1, 2004 Edition, Standard for Information Technology
+ Operating System Interface (POSIX), The Open Group Base Specifications
+ Issue 6, Copyright (c) 2001-2004 by the Institute of Electrical and
+ Electronics Engineers, Inc and The Open Group. In the event of any
+ discrepancy between this version and the original IEEE and The Open Group
+ Standard, the original IEEE and The Open Group Standard is the referee
+ document. The original Standard can be obtained online at
+ http://www.opengroup.org/unix/online.html.
+ This notice shall appear on any product containing this material.