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Date: Mon, 17 Oct 2005 20:09:03 -0400 From: Mark Schreiber <mark7@alumni.cmu.edu> To: ryan@clutteredmind.org Subject: [PATCH]SDL mprotect() crash fix (I'm going to throw this patch your way at the suggestion of #SDL -- for some reason, I had some difficulty sending it to the main list last time, and I go bonkers subscribing to send each email or patch...) Currently, when I run SDL applications as non-root using SDL_VIDEODRIVER=dga, the fbdev fallback mprotect()s read/write the proper size of mmapped /dev/fb0 (7.5MB), but on framebuffer release mprotect()s read-only the range by the entire size of my video memory (128MB), which causes a segfault: #0 0x002a9a27 in ?? () from /lib/libc.so.6 #1 0x04a63eb6 in SDL_XDGAUnmapFramebuffer (screen=3D0) at XF86DGA2.c:978 #2 0x04a63efc in SDL_XDGACloseFramebuffer (dpy=3D0x9d3f008, screen=3D0) at XF86DGA2.c:268 #3 0x04a68b57 in DGA_Available () at SDL_dgavideo.c:98 #4 0x04a53677 in SDL_VideoInit (driver_name=3D0xbfb0bfc7 "dga", flags=3D0) at SDL_video.c:180 #5 0x04a2613f in SDL_InitSubSystem (flags=3D32) at SDL.c:74 #6 0x04a2617c in SDL_Init (flags=3D32) at SDL.c:166 #7 0x08049722 in main (argc=3D1, argv=3D0x0) at testwin.c:32 This is SDL 1.2.8 on Fedora Core 4, radeon driver for a Radeon 9250, xorg-x11-6.8.2-37. I've attached a one-line patch against SDL CVS that updates the size of the framebuffer at framebuffer map time so that the mprotect() on unmap will be the same size. I'm not sure if this is the best approach (i.e. one might want to retain the original value), but it does make my SDL applications work without segfaulting. -- Best of luck, Mark Schreiber
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 19 Nov 2005 18:57:00 +0000
parents 045f186426e1
children d05306f0dc21
line wrap: on
line source

/* $XConsortium: XF86VMode.c /main/2 1995/11/14 18:17:58 kaleb $ */
/* $XFree86: xc/lib/Xxf86vm/XF86VMode.c,v 3.32 2001/07/25 15:04:54 dawes Exp $ */
/*

Copyright (c) 1995  Kaleb S. KEITHLEY

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

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 Kaleb S. KEITHLEY 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 Kaleb S. KEITHLEY 
shall not be used in advertising or otherwise to promote the sale, use 
or other dealings in this Software without prior written authorization
from Kaleb S. KEITHLEY.

*/
/* $XConsortium: XF86VMode.c /main/4 1996/01/16 07:52:25 kaleb CHECKEDOUT $ */

/* THIS IS NOT AN X CONSORTIUM STANDARD */

#define NEED_EVENTS
#define NEED_REPLIES
#ifndef XBUILD_IN_CLIENT
#include <X11/Xlibint.h>
#include "xf86vmstr.h"
#include <X11/extensions/Xext.h>
#include "extutil.h"
#else
#include "lib/X11/Xlibint.h"
#include "include/extensions/xf86vmstr.h"
#include "include/extensions/Xext.h"
#include "include/extensions/extutil.h"
#endif

#include "../../x11/SDL_x11dyn.h"

/* Workaround code in headers... */
#define _XFlush p_XFlush
#define _XFlushGCCache p_XFlushGCCache
#define _XReply p_XReply
#define _XSend p_XSend

#ifdef DEBUG
#include <stdio.h>
#endif

#ifndef MODE_BAD
#define MODE_BAD 255
#endif

static XExtensionInfo _xf86vidmode_info_data;
static XExtensionInfo *xf86vidmode_info = &_xf86vidmode_info_data;
static char *xf86vidmode_extension_name = XF86VIDMODENAME;

#define XF86VidModeCheckExtension(dpy,i,val) \
  XextCheckExtension (dpy, i, xf86vidmode_extension_name, val)

/*****************************************************************************
 *                                                                           *
 *			   private utility routines                          *
 *                                                                           *
 *****************************************************************************/

static XEXT_CLOSE_DISPLAY_PROTO(close_display);
static /* const */ XExtensionHooks xf86vidmode_extension_hooks = {
    NULL,				/* create_gc */
    NULL,				/* copy_gc */
    NULL,				/* flush_gc */
    NULL,				/* free_gc */
    NULL,				/* create_font */
    NULL,				/* free_font */
    close_display,			/* close_display */
    NULL,				/* wire_to_event */
    NULL,				/* event_to_wire */
    NULL,				/* error */
    NULL,				/* error_string */
};

static XEXT_GENERATE_FIND_DISPLAY (find_display, xf86vidmode_info, 
				   xf86vidmode_extension_name, 
				   &xf86vidmode_extension_hooks, 
				   0, NULL)

static XEXT_GENERATE_CLOSE_DISPLAY (close_display, xf86vidmode_info)


/*****************************************************************************
 *                                                                           *
 *		    public XFree86-VidMode Extension routines                *
 *                                                                           *
 *****************************************************************************/

Bool
SDL_NAME(XF86VidModeQueryExtension) (dpy, event_basep, error_basep)
    Display *dpy;
    int *event_basep, *error_basep;
{
    XExtDisplayInfo *info = find_display (dpy);

    if (XextHasExtension(info)) {
	*event_basep = info->codes->first_event;
	*error_basep = info->codes->first_error;
	return True;
    } else {
	return False;
    }
}

Bool
SDL_NAME(XF86VidModeQueryVersion)(dpy, majorVersion, minorVersion)
    Display* dpy;
    int* majorVersion; 
    int* minorVersion;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeQueryVersionReply rep;
    xXF86VidModeQueryVersionReq *req;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeQueryVersion, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeQueryVersion;
    if (!p_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return False;
    }
    *majorVersion = rep.majorVersion;
    *minorVersion = rep.minorVersion;
    UnlockDisplay(dpy);
    SyncHandle();
    if (*majorVersion >= 2)
	SDL_NAME(XF86VidModeSetClientVersion)(dpy);
    return True;
}

Bool
SDL_NAME(XF86VidModeSetClientVersion)(Display *dpy)
{
    XExtDisplayInfo *info = find_display(dpy);
    xXF86VidModeSetClientVersionReq *req;

    XF86VidModeCheckExtension(dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeSetClientVersion, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeSetClientVersion;
    req->major = XF86VIDMODE_MAJOR_VERSION;
    req->minor = XF86VIDMODE_MINOR_VERSION;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeSetGamma)(Display *dpy, int screen, SDL_NAME(XF86VidModeGamma) *Gamma)
{
    XExtDisplayInfo *info = find_display(dpy);
    xXF86VidModeSetGammaReq *req;

    XF86VidModeCheckExtension(dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeSetGamma, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeSetGamma;
    req->screen = screen;
    req->red = (CARD32)(Gamma->red * 10000.);
    req->green = (CARD32)(Gamma->green * 10000.);
    req->blue = (CARD32)(Gamma->blue * 10000.);
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeGetGamma)(Display *dpy, int screen, SDL_NAME(XF86VidModeGamma) *Gamma)
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetGammaReply rep;
    xXF86VidModeGetGammaReq *req;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeGetGamma, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetGamma;
    req->screen = screen;
    if (!p_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return False;
    }
    Gamma->red = ((float)rep.red) / 10000.;
    Gamma->green = ((float)rep.green) / 10000.;
    Gamma->blue = ((float)rep.blue) / 10000.;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeGetModeLine)(dpy, screen, dotclock, modeline)
    Display* dpy;
    int screen;
    int* dotclock; 
    SDL_NAME(XF86VidModeModeLine)* modeline;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetModeLineReply rep;
    xXF86OldVidModeGetModeLineReply oldrep;
    xXF86VidModeGetModeLineReq *req;
    int majorVersion, minorVersion;

    XF86VidModeCheckExtension (dpy, info, False);
    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);

    LockDisplay(dpy);
    GetReq(XF86VidModeGetModeLine, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetModeLine;
    req->screen = screen;
    
    if (majorVersion < 2) {
	if (!p_XReply(dpy, (xReply *)&oldrep, 
            (SIZEOF(xXF86OldVidModeGetModeLineReply) - SIZEOF(xReply)) >> 2, xFalse)) {
	    UnlockDisplay(dpy);
	    SyncHandle();
	    return False;
	}
	*dotclock = oldrep.dotclock;
	modeline->hdisplay   = oldrep.hdisplay;
	modeline->hsyncstart = oldrep.hsyncstart;
	modeline->hsyncend   = oldrep.hsyncend;
	modeline->htotal     = oldrep.htotal;
	modeline->hskew      = 0;
	modeline->vdisplay   = oldrep.vdisplay;
	modeline->vsyncstart = oldrep.vsyncstart;
	modeline->vsyncend   = oldrep.vsyncend;
	modeline->vtotal     = oldrep.vtotal;
	modeline->flags      = oldrep.flags;
	modeline->privsize   = oldrep.privsize;
    } else {
	if (!p_XReply(dpy, (xReply *)&rep, 
            (SIZEOF(xXF86VidModeGetModeLineReply) - SIZEOF(xReply)) >> 2, xFalse)) {
	    UnlockDisplay(dpy);
	    SyncHandle();
	    return False;
	}
	*dotclock = rep.dotclock;
	modeline->hdisplay   = rep.hdisplay;
	modeline->hsyncstart = rep.hsyncstart;
	modeline->hsyncend   = rep.hsyncend;
	modeline->htotal     = rep.htotal;
	modeline->hskew      = rep.hskew;
	modeline->vdisplay   = rep.vdisplay;
	modeline->vsyncstart = rep.vsyncstart;
	modeline->vsyncend   = rep.vsyncend;
	modeline->vtotal     = rep.vtotal;
	modeline->flags      = rep.flags;
	modeline->privsize   = rep.privsize;
    }
    
    if (modeline->privsize > 0) {
	if (!(modeline->private = Xcalloc(modeline->privsize, sizeof(INT32)))) {
	    p_XEatData(dpy, (modeline->privsize) * sizeof(INT32));
	    Xfree(modeline->private);
	    return False;
	}
	p_XRead(dpy, (char*)modeline->private, modeline->privsize * sizeof(INT32));
    } else {
	modeline->private = NULL;
    }
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeGetAllModeLines)(dpy, screen, modecount, modelinesPtr)
    Display* dpy;
    int screen;
    int* modecount; 
    SDL_NAME(XF86VidModeModeInfo) ***modelinesPtr;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetAllModeLinesReply rep;
    xXF86VidModeGetAllModeLinesReq *req;
    SDL_NAME(XF86VidModeModeInfo) *mdinfptr, **modelines;
    xXF86VidModeModeInfo xmdline;
    xXF86OldVidModeModeInfo oldxmdline;
    int i;
    int majorVersion, minorVersion;
    Bool protocolBug = False;

    XF86VidModeCheckExtension (dpy, info, False);

    /*
     * Note: There was a bug in the protocol implementation in versions
     * 0.x with x < 8 (the .private field wasn't being passed over the wire).
     * Check the server's version, and accept the old format if appropriate.
     */

    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);
    if (majorVersion == 0 && minorVersion < 8) {
	protocolBug = True;
#ifdef DEBUG
	fprintf(stderr, "XF86VidModeGetAllModeLines: Warning: Xserver is"
		"running an old version (%d.%d)\n", majorVersion,
		minorVersion);
#endif
    }
    
    LockDisplay(dpy);
    GetReq(XF86VidModeGetAllModeLines, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetAllModeLines;
    req->screen = screen;
    if (!p_XReply(dpy, (xReply *)&rep, 
        (SIZEOF(xXF86VidModeGetAllModeLinesReply) - SIZEOF(xReply)) >> 2, xFalse)) {
        UnlockDisplay(dpy);
	SyncHandle();
	return False;
    }

    *modecount = rep.modecount;

    if (!(modelines = (SDL_NAME(XF86VidModeModeInfo) **) Xcalloc(rep.modecount,
                                          sizeof(SDL_NAME(XF86VidModeModeInfo) *)
                                          +sizeof(SDL_NAME(XF86VidModeModeInfo))))) {
	if (majorVersion < 2)
            p_XEatData(dpy, (rep.modecount) * sizeof(xXF86OldVidModeModeInfo));
	else
            p_XEatData(dpy, (rep.modecount) * sizeof(xXF86VidModeModeInfo));
        Xfree(modelines);
        UnlockDisplay(dpy);
        SyncHandle();
        return False;
    }
    mdinfptr = (SDL_NAME(XF86VidModeModeInfo) *) (
			    (char *) modelines
			    + rep.modecount*sizeof(SDL_NAME(XF86VidModeModeInfo) *)
		    );

    for (i = 0; i < rep.modecount; i++) {
        modelines[i] = mdinfptr++;
	if (majorVersion < 2) {
            p_XRead(dpy, (char*)&oldxmdline, sizeof(xXF86OldVidModeModeInfo));
	    modelines[i]->dotclock   = oldxmdline.dotclock;
	    modelines[i]->hdisplay   = oldxmdline.hdisplay;
	    modelines[i]->hsyncstart = oldxmdline.hsyncstart;
	    modelines[i]->hsyncend   = oldxmdline.hsyncend;
	    modelines[i]->htotal     = oldxmdline.htotal;
	    modelines[i]->hskew      = 0;
	    modelines[i]->vdisplay   = oldxmdline.vdisplay;
	    modelines[i]->vsyncstart = oldxmdline.vsyncstart;
	    modelines[i]->vsyncend   = oldxmdline.vsyncend;
	    modelines[i]->vtotal     = oldxmdline.vtotal;
	    modelines[i]->flags      = oldxmdline.flags;
	    if (protocolBug) {
		modelines[i]->privsize = 0;
		modelines[i]->private = NULL;
	    } else {
		modelines[i]->privsize   = oldxmdline.privsize;
		if (oldxmdline.privsize > 0) {
	            if (!(modelines[i]->private =
			    Xcalloc(oldxmdline.privsize, sizeof(INT32)))) {
			p_XEatData(dpy, (oldxmdline.privsize) * sizeof(INT32));
			Xfree(modelines[i]->private);
		    } else {
			p_XRead(dpy, (char*)modelines[i]->private,
			     oldxmdline.privsize * sizeof(INT32));
		    }
		} else {
		  modelines[i]->private = NULL;
		}
	    }
	} else {
            p_XRead(dpy, (char*)&xmdline, sizeof(xXF86VidModeModeInfo));
	    modelines[i]->dotclock   = xmdline.dotclock;
	    modelines[i]->hdisplay   = xmdline.hdisplay;
	    modelines[i]->hsyncstart = xmdline.hsyncstart;
	    modelines[i]->hsyncend   = xmdline.hsyncend;
	    modelines[i]->htotal     = xmdline.htotal;
	    modelines[i]->hskew      = xmdline.hskew;
	    modelines[i]->vdisplay   = xmdline.vdisplay;
	    modelines[i]->vsyncstart = xmdline.vsyncstart;
	    modelines[i]->vsyncend   = xmdline.vsyncend;
	    modelines[i]->vtotal     = xmdline.vtotal;
	    modelines[i]->flags      = xmdline.flags;
	    if (protocolBug) {
		modelines[i]->privsize = 0;
		modelines[i]->private = NULL;
	    } else {
		modelines[i]->privsize   = xmdline.privsize;
		if (xmdline.privsize > 0) {
		    if (!(modelines[i]->private =
			    Xcalloc(xmdline.privsize, sizeof(INT32)))) {
			p_XEatData(dpy, (xmdline.privsize) * sizeof(INT32));
			Xfree(modelines[i]->private);
		    } else {
			p_XRead(dpy, (char*)modelines[i]->private,
			     xmdline.privsize * sizeof(INT32));
		    }
		} else {
		    modelines[i]->private = NULL;
		}
	    }
	}
    }
    *modelinesPtr = modelines;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

/*
 * GetReq replacement for use with VidMode protocols earlier than 2.0
 */
#if !defined(UNIXCPP) || defined(ANSICPP)
#define GetOldReq(name, oldname, req) \
        WORD64ALIGN\
	if ((dpy->bufptr + SIZEOF(x##oldname##Req)) > dpy->bufmax)\
		p_XFlush(dpy);\
	req = (x##oldname##Req *)(dpy->last_req = dpy->bufptr);\
	req->reqType = X_##name;\
	req->length = (SIZEOF(x##oldname##Req))>>2;\
	dpy->bufptr += SIZEOF(x##oldname##Req);\
	dpy->request++

#else  /* non-ANSI C uses empty comment instead of "##" for token concatenation */
#define GetOldReq(name, oldname, req) \
        WORD64ALIGN\
	if ((dpy->bufptr + SIZEOF(x/**/oldname/**/Req)) > dpy->bufmax)\
		p_XFlush(dpy);\
	req = (x/**/oldname/**/Req *)(dpy->last_req = dpy->bufptr);\
	req->reqType = X_/**/name;\
	req->length = (SIZEOF(x/**/oldname/**/Req))>>2;\
	dpy->bufptr += SIZEOF(x/**/oldname/**/Req);\
	dpy->request++
#endif

Bool
SDL_NAME(XF86VidModeAddModeLine) (dpy, screen, newmodeline, aftermodeline)
    Display *dpy;
    int screen;
    SDL_NAME(XF86VidModeModeInfo)* newmodeline;
    SDL_NAME(XF86VidModeModeInfo)* aftermodeline;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeAddModeLineReq *req;
    xXF86OldVidModeAddModeLineReq *oldreq;
    int majorVersion, minorVersion;

    XF86VidModeCheckExtension (dpy, info, False);
    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);

    LockDisplay(dpy);
    if (majorVersion < 2) {
	GetOldReq(XF86VidModeAddModeLine, XF86OldVidModeAddModeLine, oldreq);
	oldreq->reqType = info->codes->major_opcode;
	oldreq->xf86vidmodeReqType = X_XF86VidModeAddModeLine;
	oldreq->screen = screen;
	oldreq->dotclock =	newmodeline->dotclock;
	oldreq->hdisplay =	newmodeline->hdisplay;
	oldreq->hsyncstart =	newmodeline->hsyncstart;
	oldreq->hsyncend =	newmodeline->hsyncend;
	oldreq->htotal =	newmodeline->htotal;
	oldreq->vdisplay =	newmodeline->vdisplay;
	oldreq->vsyncstart =	newmodeline->vsyncstart;
	oldreq->vsyncend =	newmodeline->vsyncend;
	oldreq->vtotal =	newmodeline->vtotal;
	oldreq->flags =		newmodeline->flags;
	oldreq->privsize =	newmodeline->privsize;
	if (aftermodeline != NULL) {
	    oldreq->after_dotclock =	aftermodeline->dotclock;
	    oldreq->after_hdisplay =	aftermodeline->hdisplay;
	    oldreq->after_hsyncstart =	aftermodeline->hsyncstart;
	    oldreq->after_hsyncend =	aftermodeline->hsyncend;
	    oldreq->after_htotal =	aftermodeline->htotal;
	    oldreq->after_vdisplay =	aftermodeline->vdisplay;
	    oldreq->after_vsyncstart =	aftermodeline->vsyncstart;
	    oldreq->after_vsyncend =	aftermodeline->vsyncend;
	    oldreq->after_vtotal =	aftermodeline->vtotal;
	    oldreq->after_flags =	aftermodeline->flags;
	} else {
	    oldreq->after_dotclock =	0;
	    oldreq->after_hdisplay =	0;
	    oldreq->after_hsyncstart =	0;
	    oldreq->after_hsyncend =	0;
	    oldreq->after_htotal =	0;
	    oldreq->after_vdisplay =	0;
	    oldreq->after_vsyncstart =	0;
	    oldreq->after_vsyncend =	0;
	    oldreq->after_vtotal =	0;
	    oldreq->after_flags =	0;
	}
	if (newmodeline->privsize) {
	    oldreq->length += newmodeline->privsize;
	    Data32(dpy, (long *) newmodeline->private,
	       newmodeline->privsize * sizeof(INT32));
	}
    } else {
	GetReq(XF86VidModeAddModeLine, req);
	req->reqType = info->codes->major_opcode;
	req->xf86vidmodeReqType = X_XF86VidModeAddModeLine;
	req->screen = screen;
	req->dotclock =		newmodeline->dotclock;
	req->hdisplay =		newmodeline->hdisplay;
	req->hsyncstart =	newmodeline->hsyncstart;
	req->hsyncend =		newmodeline->hsyncend;
	req->htotal =		newmodeline->htotal;
	req->hskew =		newmodeline->hskew;
	req->vdisplay =		newmodeline->vdisplay;
	req->vsyncstart =	newmodeline->vsyncstart;
	req->vsyncend =		newmodeline->vsyncend;
	req->vtotal =		newmodeline->vtotal;
	req->flags =		newmodeline->flags;
	req->privsize =		newmodeline->privsize;
	if (aftermodeline != NULL) {
	    req->after_dotclock =	aftermodeline->dotclock;
	    req->after_hdisplay =	aftermodeline->hdisplay;
	    req->after_hsyncstart =	aftermodeline->hsyncstart;
	    req->after_hsyncend =	aftermodeline->hsyncend;
	    req->after_htotal =		aftermodeline->htotal;
	    req->after_hskew =		aftermodeline->hskew;
	    req->after_vdisplay =	aftermodeline->vdisplay;
	    req->after_vsyncstart =	aftermodeline->vsyncstart;
	    req->after_vsyncend =	aftermodeline->vsyncend;
	    req->after_vtotal =		aftermodeline->vtotal;
	    req->after_flags =		aftermodeline->flags;
	} else {
	    req->after_dotclock =	0;
	    req->after_hdisplay =	0;
	    req->after_hsyncstart =	0;
	    req->after_hsyncend =	0;
	    req->after_htotal =		0;
	    req->after_hskew =		0;
	    req->after_vdisplay =	0;
	    req->after_vsyncstart =	0;
	    req->after_vsyncend =	0;
	    req->after_vtotal =		0;
	    req->after_flags =		0;
	}
	if (newmodeline->privsize) {
	    req->length += newmodeline->privsize;
	    Data32(dpy, (long *) newmodeline->private,
	       newmodeline->privsize * sizeof(INT32));
	}
    }
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeDeleteModeLine) (dpy, screen, modeline)
    Display *dpy;
    int screen;
    SDL_NAME(XF86VidModeModeInfo)* modeline;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeDeleteModeLineReq *req;
    xXF86OldVidModeDeleteModeLineReq *oldreq;
    int majorVersion, minorVersion;

    XF86VidModeCheckExtension (dpy, info, 0);
    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);

    LockDisplay(dpy);
    if (majorVersion < 2) {
	GetOldReq(XF86VidModeDeleteModeLine, XF86OldVidModeDeleteModeLine, oldreq);
	oldreq->reqType = info->codes->major_opcode;
	oldreq->xf86vidmodeReqType = X_XF86VidModeDeleteModeLine;
	oldreq->screen = screen;
	oldreq->dotclock =	modeline->dotclock;
	oldreq->hdisplay =	modeline->hdisplay;
	oldreq->hsyncstart =	modeline->hsyncstart;
	oldreq->hsyncend =	modeline->hsyncend;
	oldreq->htotal =	modeline->htotal;
	oldreq->vdisplay =	modeline->vdisplay;
	oldreq->vsyncstart =	modeline->vsyncstart;
	oldreq->vsyncend =	modeline->vsyncend;
	oldreq->vtotal =	modeline->vtotal;
	oldreq->flags =		modeline->flags;
	oldreq->privsize =	modeline->privsize;
	if (modeline->privsize) {
	    oldreq->length += modeline->privsize;
	    Data32(dpy, (long *) modeline->private,
	       modeline->privsize * sizeof(INT32));
	}
    } else {
	GetReq(XF86VidModeDeleteModeLine, req);
	req->reqType = info->codes->major_opcode;
	req->xf86vidmodeReqType = X_XF86VidModeDeleteModeLine;
	req->screen = screen;
	req->dotclock =		modeline->dotclock;
	req->hdisplay =		modeline->hdisplay;
	req->hsyncstart =	modeline->hsyncstart;
	req->hsyncend =		modeline->hsyncend;
	req->htotal =		modeline->htotal;
	req->hskew =		modeline->hskew;
	req->vdisplay =		modeline->vdisplay;
	req->vsyncstart =	modeline->vsyncstart;
	req->vsyncend =		modeline->vsyncend;
	req->vtotal =		modeline->vtotal;
	req->flags =		modeline->flags;
	req->privsize =		modeline->privsize;
	if (modeline->privsize) {
	    req->length += modeline->privsize;
	    Data32(dpy, (long *) modeline->private,
	       modeline->privsize * sizeof(INT32));
	}
    }
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeModModeLine) (dpy, screen, modeline)
    Display *dpy;
    int screen;
    SDL_NAME(XF86VidModeModeLine)* modeline;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeModModeLineReq *req;
    xXF86OldVidModeModModeLineReq *oldreq;
    int majorVersion, minorVersion;

    XF86VidModeCheckExtension (dpy, info, 0);
    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);

    LockDisplay(dpy);
    if (majorVersion < 2) {
	GetOldReq(XF86VidModeModModeLine, XF86OldVidModeModModeLine, oldreq);
	oldreq->reqType = info->codes->major_opcode;
	oldreq->xf86vidmodeReqType = X_XF86VidModeModModeLine;
	oldreq->screen = screen;
	oldreq->hdisplay =	modeline->hdisplay;
	oldreq->hsyncstart =	modeline->hsyncstart;
	oldreq->hsyncend =	modeline->hsyncend;
	oldreq->htotal =	modeline->htotal;
	oldreq->vdisplay =	modeline->vdisplay;
	oldreq->vsyncstart =	modeline->vsyncstart;
	oldreq->vsyncend =	modeline->vsyncend;
	oldreq->vtotal =	modeline->vtotal;
	oldreq->flags =		modeline->flags;
	oldreq->privsize =	modeline->privsize;
	if (modeline->privsize) {
	    oldreq->length += modeline->privsize;
	    Data32(dpy, (long *) modeline->private,
	       modeline->privsize * sizeof(INT32));
	}
    } else {
	GetReq(XF86VidModeModModeLine, req);
	req->reqType = info->codes->major_opcode;
	req->xf86vidmodeReqType = X_XF86VidModeModModeLine;
	req->screen = screen;
	req->hdisplay =		modeline->hdisplay;
	req->hsyncstart =	modeline->hsyncstart;
	req->hsyncend =		modeline->hsyncend;
	req->htotal =		modeline->htotal;
	req->hskew =		modeline->hskew;
	req->vdisplay =		modeline->vdisplay;
	req->vsyncstart =	modeline->vsyncstart;
	req->vsyncend =		modeline->vsyncend;
	req->vtotal =		modeline->vtotal;
	req->flags =		modeline->flags;
	req->privsize =		modeline->privsize;
	if (modeline->privsize) {
	    req->length += modeline->privsize;
	    Data32(dpy, (long *) modeline->private,
	       modeline->privsize * sizeof(INT32));
	}
    }
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Status
SDL_NAME(XF86VidModeValidateModeLine) (dpy, screen, modeline)
    Display *dpy;
    int screen;
    SDL_NAME(XF86VidModeModeInfo)* modeline;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeValidateModeLineReq *req;
    xXF86OldVidModeValidateModeLineReq *oldreq;
    xXF86VidModeValidateModeLineReply rep;
    int majorVersion, minorVersion;

    XF86VidModeCheckExtension (dpy, info, 0);
    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);

    LockDisplay(dpy);

    if (majorVersion < 2) {
	GetOldReq(XF86VidModeValidateModeLine, XF86OldVidModeValidateModeLine, oldreq);
	oldreq->reqType = info->codes->major_opcode;
	oldreq->xf86vidmodeReqType = X_XF86VidModeValidateModeLine;
	oldreq->screen = screen;
	oldreq->dotclock =	modeline->dotclock;
	oldreq->hdisplay =	modeline->hdisplay;
	oldreq->hsyncstart =	modeline->hsyncstart;
	oldreq->hsyncend =	modeline->hsyncend;
	oldreq->htotal =	modeline->htotal;
	oldreq->vdisplay =	modeline->vdisplay;
	oldreq->vsyncstart =	modeline->vsyncstart;
	oldreq->vsyncend =	modeline->vsyncend;
	oldreq->vtotal =	modeline->vtotal;
	oldreq->flags =		modeline->flags;
	oldreq->privsize =	modeline->privsize;
	if (modeline->privsize) {
	    oldreq->length += modeline->privsize;
	    Data32(dpy, (long *) modeline->private,
	       modeline->privsize * sizeof(INT32));
	}
    } else {
	GetReq(XF86VidModeValidateModeLine, req);
	req->reqType = info->codes->major_opcode;
	req->xf86vidmodeReqType = X_XF86VidModeValidateModeLine;
	req->screen = screen;
	req->dotclock =		modeline->dotclock;
	req->hdisplay =		modeline->hdisplay;
	req->hsyncstart =	modeline->hsyncstart;
	req->hsyncend =		modeline->hsyncend;
	req->htotal =		modeline->htotal;
	req->hskew =		modeline->hskew;
	req->vdisplay =		modeline->vdisplay;
	req->vsyncstart =	modeline->vsyncstart;
	req->vsyncend =		modeline->vsyncend;
	req->vtotal =		modeline->vtotal;
	req->flags =		modeline->flags;
	req->privsize =		modeline->privsize;
	if (modeline->privsize) {
	    req->length += modeline->privsize;
	    Data32(dpy, (long *) modeline->private,
	       modeline->privsize * sizeof(INT32));
	}
    }
    if (!p_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return MODE_BAD;
    }
    UnlockDisplay(dpy);
    SyncHandle();
    return rep.status;
}

Bool
SDL_NAME(XF86VidModeSwitchMode)(dpy, screen, zoom)
    Display* dpy;
    int screen;
    int zoom;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeSwitchModeReq *req;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeSwitchMode, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeSwitchMode;
    req->screen = screen;
    req->zoom = zoom;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}
    
Bool
SDL_NAME(XF86VidModeSwitchToMode)(dpy, screen, modeline)
    Display* dpy;
    int screen;
    SDL_NAME(XF86VidModeModeInfo)* modeline;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeSwitchToModeReq *req;
    xXF86OldVidModeSwitchToModeReq *oldreq;
    int majorVersion, minorVersion;
    Bool protocolBug = False;

    XF86VidModeCheckExtension (dpy, info, False);

    /*
     * Note: There was a bug in the protocol implementation in versions
     * 0.x with x < 8 (the .private field wasn't expected to be sent over
     * the wire).  Check the server's version, and accept the old format
     * if appropriate.
     */

    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);
    if (majorVersion == 0 && minorVersion < 8) {
	protocolBug = True;
#ifdef DEBUG
	fprintf(stderr, "XF86VidModeSwitchToMode: Warning: Xserver is"
		"running an old version (%d.%d)\n", majorVersion,
		minorVersion);
#endif
    }
    
    LockDisplay(dpy);
    if (majorVersion < 2) {
	GetOldReq(XF86VidModeSwitchToMode, XF86OldVidModeSwitchToMode, oldreq);
	oldreq->reqType = info->codes->major_opcode;
	oldreq->xf86vidmodeReqType = X_XF86VidModeSwitchToMode;
	oldreq->screen = screen;
	oldreq->dotclock =	modeline->dotclock;
	oldreq->hdisplay =	modeline->hdisplay;
	oldreq->hsyncstart =	modeline->hsyncstart;
	oldreq->hsyncend =	modeline->hsyncend;
	oldreq->htotal =	modeline->htotal;
	oldreq->vdisplay =	modeline->vdisplay;
	oldreq->vsyncstart =	modeline->vsyncstart;
	oldreq->vsyncend =	modeline->vsyncend;
	oldreq->vtotal =	modeline->vtotal;
	oldreq->flags =	modeline->flags;
	if (protocolBug) {
	    oldreq->privsize = 0;
	} else {
	    oldreq->privsize =	modeline->privsize;
	    if (modeline->privsize) {
		oldreq->length += modeline->privsize;
		Data32(dpy, (long *) modeline->private,
	           modeline->privsize * sizeof(INT32));
	    }
	}
    } else {
	GetReq(XF86VidModeSwitchToMode, req);
	req->reqType = info->codes->major_opcode;
	req->xf86vidmodeReqType = X_XF86VidModeSwitchToMode;
	req->screen = screen;
	req->dotclock =	modeline->dotclock;
	req->hdisplay =	modeline->hdisplay;
	req->hsyncstart =	modeline->hsyncstart;
	req->hsyncend =	modeline->hsyncend;
	req->htotal =	modeline->htotal;
	req->hskew =	modeline->hskew;
	req->vdisplay =	modeline->vdisplay;
	req->vsyncstart =	modeline->vsyncstart;
	req->vsyncend =	modeline->vsyncend;
	req->vtotal =	modeline->vtotal;
	req->flags =	modeline->flags;
	if (protocolBug) {
	    req->privsize = 0;
	} else {
	    req->privsize =	modeline->privsize;
	    if (modeline->privsize) {
		req->length += modeline->privsize;
		Data32(dpy, (long *) modeline->private,
	           modeline->privsize * sizeof(INT32));
	    }
	}
    }
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}
    
Bool
SDL_NAME(XF86VidModeLockModeSwitch)(dpy, screen, lock)
    Display* dpy;
    int screen;
    int lock;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeLockModeSwitchReq *req;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeLockModeSwitch, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeLockModeSwitch;
    req->screen = screen;
    req->lock = lock;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}
    
Bool
SDL_NAME(XF86VidModeGetMonitor)(dpy, screen, monitor)
    Display* dpy;
    int screen;
    SDL_NAME(XF86VidModeMonitor)* monitor;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetMonitorReply rep;
    xXF86VidModeGetMonitorReq *req;
    CARD32 syncrange;
    int i;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeGetMonitor, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetMonitor;
    req->screen = screen;
    if (!p_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return False;
    }
    monitor->nhsync = rep.nhsync;
    monitor->nvsync = rep.nvsync;
#if 0
    monitor->bandwidth = (float)rep.bandwidth / 1e6;
#endif
    if (rep.vendorLength) {
	if (!(monitor->vendor = (char *)Xcalloc(rep.vendorLength + 1, 1))) {
	    p_XEatData(dpy, (rep.nhsync + rep.nvsync) * 4 +
		      ((rep.vendorLength+3) & ~3) + ((rep.modelLength+3) & ~3));
            UnlockDisplay(dpy);
            SyncHandle();
	    return False;
	}
    } else {
	monitor->vendor = NULL;
    }
    if (rep.modelLength) {
	if (!(monitor->model = Xcalloc(rep.modelLength + 1, 1))) {
	    p_XEatData(dpy, (rep.nhsync + rep.nvsync) * 4 +
		      ((rep.vendorLength+3) & ~3) + ((rep.modelLength+3) & ~3));
	    if (monitor->vendor)
		Xfree(monitor->vendor);
            UnlockDisplay(dpy);
            SyncHandle();
	    return False;
	}
    } else {
	monitor->model = NULL;
    }
    if (!(monitor->hsync = Xcalloc(rep.nhsync, sizeof(SDL_NAME(XF86VidModeSyncRange))))) {
	p_XEatData(dpy, (rep.nhsync + rep.nvsync) * 4 +
		  ((rep.vendorLength+3) & ~3) + ((rep.modelLength+3) & ~3));
	
	if (monitor->vendor)
	    Xfree(monitor->vendor);
	if (monitor->model)
	    Xfree(monitor->model);
        UnlockDisplay(dpy);
        SyncHandle();
	return False;
    }
    if (!(monitor->vsync = Xcalloc(rep.nvsync, sizeof(SDL_NAME(XF86VidModeSyncRange))))) {
	p_XEatData(dpy, (rep.nhsync + rep.nvsync) * 4 +
		  ((rep.vendorLength+3) & ~3) + ((rep.modelLength+3) & ~3));
	if (monitor->vendor)
	    Xfree(monitor->vendor);
	if (monitor->model)
	    Xfree(monitor->model);
	Xfree(monitor->hsync);
        UnlockDisplay(dpy);
        SyncHandle();
	return False;
    }
    for (i = 0; i < rep.nhsync; i++) {
	p_XRead(dpy, (char *)&syncrange, 4);
	monitor->hsync[i].lo = (float)(syncrange & 0xFFFF) / 100.0;
	monitor->hsync[i].hi = (float)(syncrange >> 16) / 100.0;
    }
    for (i = 0; i < rep.nvsync; i++) {
	p_XRead(dpy, (char *)&syncrange, 4);
	monitor->vsync[i].lo = (float)(syncrange & 0xFFFF) / 100.0;
	monitor->vsync[i].hi = (float)(syncrange >> 16) / 100.0;
    }
    if (rep.vendorLength)
	p_XReadPad(dpy, monitor->vendor, rep.vendorLength);
    else
	monitor->vendor = "";
    if (rep.modelLength)
	p_XReadPad(dpy, monitor->model, rep.modelLength);
    else
	monitor->model = "";
	
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeGetViewPort)(dpy, screen, x, y)
    Display* dpy;
    int screen;
    int *x, *y;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetViewPortReply rep;
    xXF86VidModeGetViewPortReq *req;
    int majorVersion, minorVersion;
    Bool protocolBug = False;

    XF86VidModeCheckExtension (dpy, info, False);

    /*
     * Note: There was a bug in the protocol implementation in versions
     * 0.x with x < 8 (no reply was sent, so the client would hang)
     * Check the server's version, and don't wait for a reply with older
     * versions.
     */

    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);
    if (majorVersion == 0 && minorVersion < 8) {
	protocolBug = True;
#ifdef DEBUG
	fprintf(stderr, "XF86VidModeGetViewPort: Warning: Xserver is"
		"running an old version (%d.%d)\n", majorVersion,
		minorVersion);
#endif
    }
    LockDisplay(dpy);
    GetReq(XF86VidModeGetViewPort, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetViewPort;
    req->screen = screen;
    if (protocolBug) {
	*x = 0;
	*y = 0;
    } else {
	if (!p_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	    UnlockDisplay(dpy);
	    SyncHandle();
	    return False;
	}
	*x = rep.x;
	*y = rep.y;
    }

    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeSetViewPort)(dpy, screen, x, y)
    Display* dpy;
    int screen;
    int x, y;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeSetViewPortReq *req;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeSetViewPort, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeSetViewPort;
    req->screen = screen;
    req->x = x;
    req->y = y;

    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeGetDotClocks)(dpy, screen,
	    flagsPtr, numclocksPtr, maxclocksPtr, clocksPtr)
    Display* dpy;
    int screen;
    int *flagsPtr, *numclocksPtr, *maxclocksPtr, *clocksPtr[]; 
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetDotClocksReply rep;
    xXF86VidModeGetDotClocksReq *req;
    int i, *dotclocks;
    CARD32 dotclk;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeGetDotClocks, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetDotClocks;
    req->screen = screen;
    if (!p_XReply(dpy, (xReply *)&rep, 
        (SIZEOF(xXF86VidModeGetDotClocksReply) - SIZEOF(xReply)) >> 2, xFalse))
    {
        UnlockDisplay(dpy);
        SyncHandle();
        return False;
    }
    *numclocksPtr = rep.clocks;
    *maxclocksPtr = rep.maxclocks;
    *flagsPtr     = rep.flags;

    if (!(dotclocks = (int*) Xcalloc(rep.clocks, sizeof(int)))) {
        p_XEatData(dpy, (rep.clocks) * 4);
        Xfree(dotclocks);
        UnlockDisplay(dpy);
        SyncHandle();
        return False;
    }

    for (i = 0; i < rep.clocks; i++) {
        p_XRead(dpy, (char*)&dotclk, 4);
	dotclocks[i] = dotclk;
    }
    *clocksPtr = dotclocks;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeSetGammaRamp) (
    Display *dpy,
    int screen,
    int size,
    unsigned short *red,
    unsigned short *green,
    unsigned short *blue
)
{
    int length = (size + 1) & ~1;
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeSetGammaRampReq *req;

    XF86VidModeCheckExtension (dpy, info, False);
    LockDisplay(dpy);
    GetReq(XF86VidModeSetGammaRamp, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeSetGammaRamp;
    req->screen = screen;
    req->length += (length >> 1) * 3;
    req->size = size;
    p_XSend(dpy, (char*)red, size * 2);
    p_XSend(dpy, (char*)green, size * 2);
    p_XSend(dpy, (char*)blue, size * 2);
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}


Bool
SDL_NAME(XF86VidModeGetGammaRamp) (
    Display *dpy,
    int screen,
    int size,
    unsigned short *red,
    unsigned short *green,
    unsigned short *blue
)
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetGammaRampReq *req;
    xXF86VidModeGetGammaRampReply rep;
  
    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeGetGammaRamp, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetGammaRamp;
    req->screen = screen;
    req->size = size;
    if (!p_XReply (dpy, (xReply *) &rep, 0, xFalse)) {
        UnlockDisplay (dpy);
        SyncHandle ();
        return False;
    }
    if(rep.size) {
	p_XRead(dpy, (char*)red, rep.size << 1);
	p_XRead(dpy, (char*)green, rep.size << 1);
	p_XRead(dpy, (char*)blue, rep.size << 1);
    }

    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool SDL_NAME(XF86VidModeGetGammaRampSize)(
    Display *dpy,
    int screen,
    int *size
)
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetGammaRampSizeReq *req;
    xXF86VidModeGetGammaRampSizeReply rep;
  
    *size = 0;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeGetGammaRampSize, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetGammaRampSize;
    req->screen = screen;
    if (!p_XReply (dpy, (xReply *) &rep, 0, xTrue)) {
        UnlockDisplay (dpy);
        SyncHandle ();
        return False; 
    }
    *size = rep.size;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}