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diff --git a/cpukit/include/rtems/posix/posixapi.h b/cpukit/include/rtems/posix/posixapi.h
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+/**
+ * @file
+ *
+ * @brief POSIX API Implementation
+ *
+ * This include file defines the top level interface to the POSIX API
+ * implementation in RTEMS.
+ */
+
+/*
+ *  COPYRIGHT (c) 1989-2011.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef _RTEMS_POSIX_POSIXAPI_H
+#define _RTEMS_POSIX_POSIXAPI_H
+
+#include <rtems/config.h>
+#include <rtems/score/assert.h>
+#include <rtems/score/objectimpl.h>
+#include <rtems/score/onceimpl.h>
+#include <rtems/score/threadimpl.h>
+#include <rtems/seterr.h>
+
+#include <pthread.h>
+
+/**
+ * @defgroup POSIXAPI RTEMS POSIX API
+ *
+ * RTEMS POSIX API definitions and modules.
+ *
+ */
+/**@{**/
+
+/**
+ * @brief POSIX API Fatal domains.
+ */
+typedef enum {
+  POSIX_FD_PTHREAD,      /**< A pthread thread error. */
+  POSIX_FD_PTHREAD_ONCE  /**< A pthread once error. */
+} POSIX_Fatal_domain;
+
+/**
+ * @brief POSIX API Fatal error.
+ *
+ * A common method of rasing a POSIX API fatal error.
+ *
+ * @param[in] domain The POSIX error domain.
+ * @param[in] eno The error number as defined in errno.h.
+ */
+void _POSIX_Fatal_error( POSIX_Fatal_domain domain, int eno );
+
+extern const int _POSIX_Get_by_name_error_table[ 3 ];
+
+RTEMS_INLINE_ROUTINE int _POSIX_Get_by_name_error(
+  Objects_Get_by_name_error error
+)
+{
+  _Assert( (size_t) error < RTEMS_ARRAY_SIZE( _POSIX_Get_by_name_error_table ) );
+  return _POSIX_Get_by_name_error_table[ error ];
+}
+
+RTEMS_INLINE_ROUTINE int _POSIX_Get_error( Status_Control status )
+{
+  return STATUS_GET_POSIX( status );
+}
+
+RTEMS_INLINE_ROUTINE int _POSIX_Get_error_after_wait(
+  const Thread_Control *executing
+)
+{
+  return _POSIX_Get_error( _Thread_Wait_get_status( executing ) );
+}
+
+RTEMS_INLINE_ROUTINE int _POSIX_Zero_or_minus_one_plus_errno(
+  Status_Control status
+)
+{
+  if ( status == STATUS_SUCCESSFUL ) {
+    return 0;
+  }
+
+  rtems_set_errno_and_return_minus_one( _POSIX_Get_error( status ) );
+}
+
+/**
+ * @brief Macro to generate a function body to get a POSIX object by
+ * identifier.
+ *
+ * Generates a function body to get the object for the specified identifier.
+ * Performs automatic initialization if requested and necessary.  This is an
+ * ugly macro, since C lacks support for templates.
+ */
+#define _POSIX_Get_object_body( \
+  type, \
+  id, \
+  queue_context, \
+  info, \
+  initializer, \
+  init \
+) \
+  Objects_Control *the_object; \
+  if ( id == NULL ) { \
+    return NULL; \
+  } \
+  _Thread_queue_Context_initialize( queue_context ); \
+  the_object = _Objects_Get( \
+    (Objects_Id) *id, \
+    &queue_context->Lock_context.Lock_context, \
+    info \
+  ); \
+  if ( the_object == NULL ) { \
+    _Once_Lock(); \
+    if ( *id == initializer ) { \
+      init( id, NULL ); \
+    } \
+    _Once_Unlock(); \
+    the_object = _Objects_Get( \
+      (Objects_Id) *id, \
+      &queue_context->Lock_context.Lock_context, \
+      info \
+    ); \
+  } \
+  return (type *) the_object
+
+/*
+ * See also The Open Group Base Specifications Issue 7, IEEE Std 1003.1-2008,
+ * 2016 Edition, subsection 2.9.9, Synchronization Object Copies and
+ * Alternative Mappings.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_09_09
+ */
+RTEMS_INLINE_ROUTINE bool _POSIX_Is_valid_pshared( int pshared )
+{
+  return pshared == PTHREAD_PROCESS_PRIVATE ||
+    pshared == PTHREAD_PROCESS_SHARED;
+}
+
+/** @} */
+
+#endif
+/* end of include file */