R6.6 is the Xorg base-line

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diff --git a/include/extnsionst.h b/include/extnsionst.h
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+++ b/include/extnsionst.h
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+/* $Xorg: extnsionst.h,v 1.4 2001/02/09 02:05:15 xorgcvs Exp $ */
+/***********************************************************
+
+Copyright 1987, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+
+Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its 
+documentation for any purpose and without fee is hereby granted, 
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in 
+supporting documentation, and that the name of Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.  
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+******************************************************************/
+#ifndef EXTENSIONSTRUCT_H
+#define EXTENSIONSTRUCT_H 
+
+#include "misc.h"
+#include "screenint.h"
+#include "extension.h"
+#include "gc.h"
+
+typedef struct _ExtensionEntry {
+    int index;
+    void (* CloseDown)(	/* called at server shutdown */
+#if NeedNestedPrototypes
+	struct _ExtensionEntry * /* extension */
+#endif
+);
+    char *name;               /* extension name */
+    int base;                 /* base request number */
+    int eventBase;            
+    int eventLast;
+    int errorBase;
+    int errorLast;
+    int num_aliases;
+    char **aliases;
+    pointer extPrivate;
+    unsigned short (* MinorOpcode)(	/* called for errors */
+#if NeedNestedPrototypes
+	ClientPtr /* client */
+#endif
+);
+#ifdef XCSECURITY
+    Bool secure;		/* extension visible to untrusted clients? */
+#endif
+} ExtensionEntry;
+
+/* any attempt to declare the types of the parameters to the functions
+ * in EventSwapVector fails.  The functions take pointers to two events,
+ * but the exact event types that are declared vary from one function 
+ * to another.  You can't even put void *, void * (the ibm compiler
+ * complains, anyway).
+ */
+extern void (* EventSwapVector[128]) ();
+
+typedef void (* ExtensionLookupProc)(/*args indeterminate*/);
+
+typedef struct _ProcEntry {
+    char *name;
+    ExtensionLookupProc proc;
+} ProcEntryRec, *ProcEntryPtr;
+
+typedef struct _ScreenProcEntry {
+    int num;
+    ProcEntryPtr procList;
+} ScreenProcEntry;
+
+#define    SetGCVector(pGC, VectorElement, NewRoutineAddress, Atom)    \
+    pGC->VectorElement = NewRoutineAddress;
+
+#define    GetGCValue(pGC, GCElement)    (pGC->GCElement)
+
+
+extern ExtensionEntry *AddExtension(
+#if NeedFunctionPrototypes
+    char* /*name*/,
+    int /*NumEvents*/,
+    int /*NumErrors*/,
+    int (* /*MainProc*/)(
+#if NeedNestedPrototypes
+	ClientPtr /*client*/
+#endif
+),
+    int (* /*SwappedMainProc*/)(
+#if NeedNestedPrototypes
+	ClientPtr /*client*/
+#endif
+),
+    void (* /*CloseDownProc*/)(
+#if NeedNestedPrototypes
+	ExtensionEntry * /*extension*/
+#endif
+),
+    unsigned short (* /*MinorOpcodeProc*/)(
+#if NeedNestedPrototypes
+	ClientPtr /*client*/
+#endif
+	)
+#endif /* NeedFunctionPrototypes */
+);
+
+extern Bool AddExtensionAlias(
+#if NeedFunctionPrototypes
+    char* /*alias*/,
+    ExtensionEntry * /*extension*/
+#endif
+);
+
+extern ExtensionLookupProc LookupProc(
+#if NeedFunctionPrototypes
+    char* /*name*/,
+    GCPtr /*pGC*/
+#endif
+);
+
+extern Bool RegisterProc(
+#if NeedFunctionPrototypes
+    char* /*name*/,
+    GCPtr /*pGC*/,
+    ExtensionLookupProc /*proc*/
+#endif
+);
+
+extern Bool RegisterScreenProc(
+#if NeedFunctionPrototypes
+    char* /*name*/,
+    ScreenPtr /*pScreen*/,
+    ExtensionLookupProc /*proc*/
+#endif
+);
+
+extern void DeclareExtensionSecurity(
+#if NeedFunctionPrototypes
+    char * /*extname*/,
+    Bool /*secure*/
+#endif
+);
+
+#endif /* EXTENSIONSTRUCT_H */
+