/dix/dispatch.c

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/************************************************************

Copyright 1987, 1989, 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, 1989 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.

********************************************************/

/* The panoramix components contained the following notice */
/*****************************************************************

Copyright (c) 1991, 1997 Digital Equipment Corporation, Maynard, Massachusetts.

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.

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
DIGITAL EQUIPMENT CORPORATION BE LIABLE FOR ANY CLAIM, DAMAGES, INCLUDING,
BUT NOT LIMITED TO CONSEQUENTIAL OR INCIDENTAL 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 Digital Equipment Corporation
shall not be used in advertising or otherwise to promote the sale, use or other
dealings in this Software without prior written authorization from Digital
Equipment Corporation.

******************************************************************/

/* XSERVER_DTRACE additions:
 * Copyright (c) 2005-2006, Oracle and/or its affiliates. All rights reserved.
 *
 * 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 (including the next
 * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.
 */

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#include <version-config.h>
#endif

#ifdef PANORAMIX_DEBUG
#include <stdio.h>
int ProcInitialConnection();
#endif

#include "windowstr.h"
#include <X11/fonts/fontstruct.h>
#include "dixfontstr.h"
#include "gcstruct.h"
#include "selection.h"
#include "colormapst.h"
#include "cursorstr.h"
#include "scrnintstr.h"
#include "opaque.h"
#include "input.h"
#include "servermd.h"
#include "extnsionst.h"
#include "dixfont.h"
#include "dispatch.h"
#include "swaprep.h"
#include "swapreq.h"
#include "privates.h"
#include "xace.h"
#include "inputstr.h"
#include "xkbsrv.h"
#include "site.h"
#include "client.h"

#ifdef XSERVER_DTRACE
#include "registry.h"
#include <sys/types.h>
typedef const char *string;

#include "Xserver-dtrace.h"
#endif

#define mskcnt ((MAXCLIENTS + 31) / 32)
#define BITMASK(i) (1U << ((i) & 31))
#define MASKIDX(i) ((i) >> 5)
#define MASKWORD(buf, i) buf[MASKIDX(i)]
#define BITSET(buf, i) MASKWORD(buf, i) |= BITMASK(i)
#define BITCLEAR(buf, i) MASKWORD(buf, i) &= ~BITMASK(i)
#define GETBIT(buf, i) (MASKWORD(buf, i) & BITMASK(i))

xConnSetupPrefix connSetupPrefix;

PaddingInfo PixmapWidthPaddingInfo[33];

static ClientPtr grabClient;

#define GrabNone 0
#define GrabActive 1
#define GrabKickout 2
static int grabState = GrabNone;
static long grabWaiters[mskcnt];
CallbackListPtr ServerGrabCallback = NULL;
HWEventQueuePtr checkForInput[2];
int connBlockScreenStart;

static void KillAllClients(void);

static int nextFreeClientID;    /* always MIN free client ID */

static int nClients;            /* number of authorized clients */

CallbackListPtr ClientStateCallback;

/* dispatchException & isItTimeToYield must be declared volatile since they
 * are modified by signal handlers - otherwise optimizer may assume it doesn't
 * need to actually check value in memory when used and may miss changes from
 * signal handlers.
 */
volatile char dispatchException = 0;
volatile char isItTimeToYield;

#define SAME_SCREENS(a, b) (\
    (a.pScreen == b.pScreen))

void
SetInputCheck(HWEventQueuePtr c0, HWEventQueuePtr c1)
{
    checkForInput[0] = c0;
    checkForInput[1] = c1;
}

void
UpdateCurrentTime(void)
{
    TimeStamp systime;

    /* To avoid time running backwards, we must call GetTimeInMillis before
     * calling ProcessInputEvents.
     */
    systime.months = currentTime.months;
    systime.milliseconds = GetTimeInMillis();
    if (systime.milliseconds < currentTime.milliseconds)
        systime.months++;
    if (*checkForInput[0] != *checkForInput[1])
        ProcessInputEvents();
    if (CompareTimeStamps(systime, currentTime) == LATER)
        currentTime = systime;
}

/* Like UpdateCurrentTime, but can't call ProcessInputEvents */
void
UpdateCurrentTimeIf(void)
{
    TimeStamp systime;

    systime.months = currentTime.months;
    systime.milliseconds = GetTimeInMillis();
    if (systime.milliseconds < currentTime.milliseconds)
        systime.months++;
    if (CompareTimeStamps(systime, currentTime) == LATER)
        currentTime = systime;
}

#undef SMART_DEBUG

/* in milliseconds */
#define SMART_SCHEDULE_DEFAULT_INTERVAL	5
#define SMART_SCHEDULE_MAX_SLICE	15

#if defined(WIN32) && !defined(__CYGWIN__)
Bool SmartScheduleDisable = TRUE;
#else
Bool SmartScheduleDisable = FALSE;
#endif
long SmartScheduleSlice = SMART_SCHEDULE_DEFAULT_INTERVAL;
long SmartScheduleInterval = SMART_SCHEDULE_DEFAULT_INTERVAL;
long SmartScheduleMaxSlice = SMART_SCHEDULE_MAX_SLICE;
long SmartScheduleTime;
int SmartScheduleLatencyLimited = 0;
static ClientPtr SmartLastClient;
static int SmartLastIndex[SMART_MAX_PRIORITY - SMART_MIN_PRIORITY + 1];

#ifdef SMART_DEBUG
long SmartLastPrint;
#endif

void Dispatch(void);

static int
SmartScheduleClient(int *clientReady, int nready)
{
    ClientPtr pClient;
    int i;
    int client;
    int bestPrio, best = 0;
    int bestRobin, robin;
    long now = SmartScheduleTime;
    long idle;

    bestPrio = -0x7fffffff;
    bestRobin = 0;
    idle = 2 * SmartScheduleSlice;
    for (i = 0; i < nready; i++) {
        client = clientReady[i];
        pClient = clients[client];
        /* Praise clients which haven't run in a while */
        if ((now - pClient->smart_stop_tick) >= idle) {
            if (pClient->smart_priority < 0)
                pClient->smart_priority++;
        }

        /* check priority to select best client */
        robin =
            (pClient->index -
             SmartLastIndex[pClient->smart_priority -
                            SMART_MIN_PRIORITY]) & 0xff;
        if (pClient->smart_priority > bestPrio ||
            (pClient->smart_priority == bestPrio && robin > bestRobin)) {
            bestPrio = pClient->smart_priority;
            bestRobin = robin;
            best = client;
        }
#ifdef SMART_DEBUG
        if ((now - SmartLastPrint) >= 5000)
            fprintf(stderr, " %2d: %3d", client, pClient->smart_priority);
#endif
    }
#ifdef SMART_DEBUG
    if ((now - SmartLastPrint) >= 5000) {
        fprintf(stderr, " use %2d\n", best);
        SmartLastPrint = now;
    }
#endif
    pClient = clients[best];
    SmartLastIndex[bestPrio - SMART_MIN_PRIORITY] = pClient->index;
    /*
     * Set current client pointer
     */
    if (SmartLastClient != pClient) {
        pClient->smart_start_tick = now;
        SmartLastClient = pClient;
    }
    /*
     * Adjust slice
     */
    if (nready == 1 && SmartScheduleLatencyLimited == 0) {
        /*
         * If it's been a long time since another client
         * has run, bump the slice up to get maximal
         * performance from a single client
         */
        if ((now - pClient->smart_start_tick) > 1000 &&
            SmartScheduleSlice < SmartScheduleMaxSlice) {
            SmartScheduleSlice += SmartScheduleInterval;
        }
    }
    else {
        SmartScheduleSlice = SmartScheduleInterval;
    }
    return best;
}

void
EnableLimitedSchedulingLatency(void)
{
    ++SmartScheduleLatencyLimited;
    SmartScheduleSlice = SmartScheduleInterval;
}

void
DisableLimitedSchedulingLatency(void)
{
    --SmartScheduleLatencyLimited;

    /* protect against bugs */
    if (SmartScheduleLatencyLimited < 0)
        SmartScheduleLatencyLimited = 0;
}

void
Dispatch(void)
{
    int *clientReady;           /* array of request ready clients */
    int result;
    ClientPtr client;
    int nready;
    HWEventQueuePtr *icheck = checkForInput;
    long start_tick;

    nextFreeClientID = 1;
    nClients = 0;

    clientReady = malloc(sizeof(int) * MaxClients);
    if (!clientReady)
        return;

    SmartScheduleSlice = SmartScheduleInterval;
    while (!dispatchException) {
        if (*icheck[0] != *icheck[1]) {
            ProcessInputEvents();
            FlushIfCriticalOutputPending();
        }

        nready = WaitForSomething(clientReady);

        if (nready && !SmartScheduleDisable) {
            clientReady[0] = SmartScheduleClient(clientReady, nready);
            nready = 1;
        }
       /***************** 
	*  Handle events in round robin fashion, doing input between 
	*  each round 
	*****************/

        while (!dispatchException && (--nready >= 0)) {
            client = clients[clientReady[nready]];
            if (!client) {
                /* KillClient can cause this to happen */
                continue;
            }
            /* GrabServer activation can cause this to be true */
            if (grabState == GrabKickout) {
                grabState = GrabActive;
                break;
            }
            isItTimeToYield = FALSE;

            start_tick = SmartScheduleTime;
            while (!isItTimeToYield) {
                if (*icheck[0] != *icheck[1])
                    ProcessInputEvents();

                FlushIfCriticalOutputPending();
                if (!SmartScheduleDisable &&
                    (SmartScheduleTime - start_tick) >= SmartScheduleSlice) {
                    /* Penalize clients which consume ticks */
                    if (client->smart_priority > SMART_MIN_PRIORITY)
                        client->smart_priority--;
                    break;
                }
                /* now, finally, deal with client requests */

                /* Update currentTime so request time checks, such as for input
                 * device grabs, are calculated correctly */
                UpdateCurrentTimeIf();
                result = ReadRequestFromClient(client);
                if (result <= 0) {
                    if (result < 0)
                        CloseDownClient(client);
                    break;
                }

                client->sequence++;
                client->majorOp = ((xReq *) client->requestBuffer)->reqType;
                client->minorOp = 0;
                if (client->majorOp >= EXTENSION_BASE) {
                    ExtensionEntry *ext = GetExtensionEntry(client->majorOp);

                    if (ext)
                        client->minorOp = ext->MinorOpcode(client);
                }
#ifdef XSERVER_DTRACE
                if (XSERVER_REQUEST_START_ENABLED())
                    XSERVER_REQUEST_START(LookupMajorName(client->majorOp),
                                          client->majorOp,
                                          ((xReq *) client->requestBuffer)->length,
                                          client->index,
                                          client->requestBuffer);
#endif
                if (result > (maxBigRequestSize << 2))
                    result = BadLength;
                else {
                    result = XaceHookDispatch(client, client->majorOp);
                    if (result == Success)
                        result =
                            (*client->requestVector[client->majorOp]) (client);
                    XaceHookAuditEnd(client, result);
                }
#ifdef XSERVER_DTRACE
                if (XSERVER_REQUEST_DONE_ENABLED())
                    XSERVER_REQUEST_DONE(LookupMajorName(client->majorOp),
                                         client->majorOp, client->sequence,
                                         client->index, result);
#endif

                if (client->noClientException != Success) {
                    CloseDownClient(client);
                    break;
                }
                else if (result != Success) {
                    SendErrorToClient(client, client->majorOp,
                                      client->minorOp,
                                      client->errorValue, result);
                    break;
                }
            }
            FlushAllOutput();
            client = clients[clientReady[nready]];
            if (client)
                client->smart_stop_tick = SmartScheduleTime;
        }
        dispatchException &= ~DE_PRIORITYCHANGE;
    }
#if defined(DDXBEFORERESET)
    ddxBeforeReset();
#endif
    KillAllClients();
    free(clientReady);
    dispatchException &= ~DE_RESET;
    SmartScheduleLatencyLimited = 0;
    ResetOsBuffers();
}

static int VendorRelease = VENDOR_RELEASE;
static const char *VendorString = VENDOR_NAME;

void
SetVendorRelease(int release)
{
    VendorRelease = release;
}

void
SetVendorString(const char *vendor)
{
    VendorString = vendor;
}

Bool
CreateConnectionBlock(void)
{
    xConnSetup setup;
    xWindowRoot root;
    xDepth depth;
    xVisualType visual;
    xPixmapFormat format;
    unsigned long vid;
    int i, j, k, lenofblock, sizesofar = 0;
    char *pBuf;

    memset(&setup, 0, sizeof(xConnSetup));
    /* Leave off the ridBase and ridMask, these must be sent with
       connection */

    setup.release = VendorRelease;
    /*
     * per-server image and bitmap parameters are defined in Xmd.h
     */
    setup.imageByteOrder = screenInfo.imageByteOrder;

    setup.bitmapScanlineUnit = screenInfo.bitmapScanlineUnit;
    setup.bitmapScanlinePad = screenInfo.bitmapScanlinePad;

    setup.bitmapBitOrder = screenInfo.bitmapBitOrder;
    setup.motionBufferSize = NumMotionEvents();
    setup.numRoots = screenInfo.numScreens;
    setup.nbytesVendor = strlen(VendorString);
    setup.numFormats = screenInfo.numPixmapFormats;
    setup.maxRequestSize = MAX_REQUEST_SIZE;
    QueryMinMaxKeyCodes(&setup.minKeyCode, &setup.maxKeyCode);

    lenofblock = sizeof(xConnSetup) +
        pad_to_int32(setup.nbytesVendor) +
        (setup.numFormats * sizeof(xPixmapFormat)) +
        (setup.numRoots * sizeof(xWindowRoot));
    ConnectionInfo = malloc(lenofblock);
    if (!ConnectionInfo)
        return FALSE;

    memmove(ConnectionInfo, (char *) &setup, sizeof(xConnSetup));
    sizesofar = sizeof(xConnSetup);
    pBuf = ConnectionInfo + sizeof(xConnSetup);

    memmove(pBuf, VendorString, (int) setup.nbytesVendor);
    sizesofar += setup.nbytesVendor;
    pBuf += setup.nbytesVendor;
    i = padding_for_int32(setup.nbytesVendor);
    sizesofar += i;
    while (--i >= 0)
        *pBuf++ = 0;

    memset(&format, 0, sizeof(xPixmapFormat));
    for (i = 0; i < screenInfo.numPixmapFormats; i++) {
        format.depth = screenInfo.formats[i].depth;
        format.bitsPerPixel = screenInfo.formats[i].bitsPerPixel;
        format.scanLinePad = screenInfo.formats[i].scanlinePad;
        memmove(pBuf, (char *) &format, sizeof(xPixmapFormat));
        pBuf += sizeof(xPixmapFormat);
        sizesofar += sizeof(xPixmapFormat);
    }

    connBlockScreenStart = sizesofar;
    memset(&depth, 0, sizeof(xDepth));
    memset(&visual, 0, sizeof(xVisualType));
    for (i = 0; i < screenInfo.numScreens; i++) {
        ScreenPtr pScreen;
        DepthPtr pDepth;
        VisualPtr pVisual;

        pScreen = screenInfo.screens[i];
        root.windowId = pScreen->root->drawable.id;
        root.defaultColormap = pScreen->defColormap;
        root.whitePixel = pScreen->whitePixel;
        root.blackPixel = pScreen->blackPixel;
        root.currentInputMask = 0;      /* filled in when sent */
        root.pixWidth = pScreen->width;
        root.pixHeight = pScreen->height;
        root.mmWidth = pScreen->mmWidth;
        root.mmHeight = pScreen->mmHeight;
        root.minInstalledMaps = pScreen->minInstalledCmaps;
        root.maxInstalledMaps = pScreen->maxInstalledCmaps;
        root.rootVisualID = pScreen->rootVisual;
        root.backingStore = pScreen->backingStoreSupport;
        root.saveUnders = FALSE;
        root.rootDepth = pScreen->rootDepth;
        root.nDepths = pScreen->numDepths;
        memmove(pBuf, (char *) &root, sizeof(xWindowRoot));
        sizesofar += sizeof(xWindowRoot);
        pBuf += sizeof(xWindowRoot);

        pDepth = pScreen->allowedDepths;
        for (j = 0; j < pScreen->numDepths; j++, pDepth++) {
            lenofblock += sizeof(xDepth) +
                (pDepth->numVids * sizeof(xVisualType));
            pBuf = (char *) realloc(ConnectionInfo, lenofblock);
            if (!pBuf) {
                free(ConnectionInfo);
                return FALSE;
            }
            ConnectionInfo = pBuf;
            pBuf += sizesofar;
            depth.depth = pDepth->depth;
            depth.nVisuals = pDepth->numVids;
            memmove(pBuf, (char *) &depth, sizeof(xDepth));
            pBuf += sizeof(xDepth);
            sizesofar += sizeof(xDepth);
            for (k = 0; k < pDepth->numVids; k++) {
                vid = pDepth->vids[k];
                for (pVisual = pScreen->visuals;
                     pVisual->vid != vid; pVisual++);
                visual.visualID = vid;
                visual.class = pVisual->class;
                visual.bitsPerRGB = pVisual->bitsPerRGBValue;
                visual.colormapEntries = pVisual->ColormapEntries;
                visual.redMask = pVisual->redMask;
                visual.greenMask = pVisual->greenMask;
                visual.blueMask = pVisual->blueMask;
                memmove(pBuf, (char *) &visual, sizeof(xVisualType));
                pBuf += sizeof(xVisualType);
                sizesofar += sizeof(xVisualType);
            }
        }
    }
    connSetupPrefix.success = xTrue;
    connSetupPrefix.length = lenofblock / 4;
    connSetupPrefix.majorVersion = X_PROTOCOL;
    connSetupPrefix.minorVersion = X_PROTOCOL_REVISION;
    return TRUE;
}

int
ProcBadRequest(ClientPtr client)
{
    return BadRequest;
}

int
ProcCreateWindow(ClientPtr client)
{
    WindowPtr pParent, pWin;

    REQUEST(xCreateWindowReq);
    int len, rc;

    REQUEST_AT_LEAST_SIZE(xCreateWindowReq);

    LEGAL_NEW_RESOURCE(stuff->wid, client);
    rc = dixLookupWindow(&pParent, stuff->parent, client, DixAddAccess);
    if (rc != Success)
        return rc;
    len = client->req_len - bytes_to_int32(sizeof(xCreateWindowReq));
    if (Ones(stuff->mask) != len)
        return BadLength;
    if (!stuff->width || !stuff->height) {
        client->errorValue = 0;
        return BadValue;
    }
    pWin = CreateWindow(stuff->wid, pParent, stuff->x,
                        stuff->y, stuff->width, stuff->height,
                        stuff->borderWidth, stuff->class,
                        stuff->mask, (XID *) &stuff[1],
                        (int) stuff->depth, client, stuff->visual, &rc);
    if (pWin) {
        Mask mask = pWin->eventMask;

        pWin->eventMask = 0;    /* subterfuge in case AddResource fails */
        if (!AddResource(stuff->wid, RT_WINDOW, (void *) pWin))
            return BadAlloc;
        pWin->eventMask = mask;
    }
    return rc;
}

int
ProcChangeWindowAttributes(ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xChangeWindowAttributesReq);
    int len, rc;
    Mask access_mode = 0;

    REQUEST_AT_LEAST_SIZE(xChangeWindowAttributesReq);
    access_mode |= (stuff->valueMask & CWEventMask) ? DixReceiveAccess : 0;
    access_mode |= (stuff->valueMask & ~CWEventMask) ? DixSetAttrAccess : 0;
    rc = dixLookupWindow(&pWin, stuff->window, client, access_mode);
    if (rc != Success)
        return rc;
    len = client->req_len - bytes_to_int32(sizeof(xChangeWindowAttributesReq));
    if (len != Ones(stuff->valueMask))
        return BadLength;
    return ChangeWindowAttributes(pWin,
                                  stuff->valueMask, (XID *) &stuff[1], client);
}

int
ProcGetWindowAttributes(ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xResourceReq);
    xGetWindowAttributesReply wa;
    int rc;

    REQUEST_SIZE_MATCH(xResourceReq);
    rc = dixLookupWindow(&pWin, stuff->id, client, DixGetAttrAccess);
    if (rc != Success)
        return rc;
    memset(&wa, 0, sizeof(xGetWindowAttributesReply));
    GetWindowAttributes(pWin, client, &wa);
    WriteReplyToClient(client, sizeof(xGetWindowAttributesReply), &wa);
    return Success;
}

int
ProcDestroyWindow(ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xResourceReq);
    int rc;

    REQUEST_SIZE_MATCH(xResourceReq);
    rc = dixLookupWindow(&pWin, stuff->id, client, DixDestroyAccess);
    if (rc != Success)
        return rc;
    if (pWin->parent) {
        rc = dixLookupWindow(&pWin, pWin->parent->drawable.id, client,
                             DixRemoveAccess);
        if (rc != Success)
            return rc;
        FreeResource(stuff->id, RT_NONE);
    }
    return Success;
}

int
ProcDestroySubwindows(ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xResourceReq);
    int rc;

    REQUEST_SIZE_MATCH(xResourceReq);
    rc = dixLookupWindow(&pWin, stuff->id, client, DixRemoveAccess);
    if (rc != Success)
        return rc;
    DestroySubwindows(pWin, client);
    return Success;
}

int
ProcChangeSaveSet(ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xChangeSaveSetReq);
    int rc;

    REQUEST_SIZE_MATCH(xChangeSaveSetReq);
    rc = dixLookupWindow(&pWin, stuff->window, client, DixManageAccess);
    if (rc != Success)
        return rc;
    if (client->clientAsMask == (CLIENT_BITS(pWin->drawable.id)))
        return BadMatch;
    if ((stuff->mode == SetModeInsert) || (stuff->mode == SetModeDelete))
        return AlterSaveSetForClient(client, pWin, stuff->mode, FALSE, TRUE);
    client->errorValue = stuff->mode;
    return BadValue;
}

int
ProcReparentWindow(ClientPtr client)
{
    WindowPtr pWin, pParent;

    REQUEST(xReparentWindowReq);
    int rc;

    REQUEST_SIZE_MATCH(xReparentWindowReq);
    rc = dixLookupWindow(&pWin, stuff->window, client, DixManageAccess);
    if (rc != Success)
        return rc;
    rc = dixLookupWindow(&pParent, stuff->parent, client, DixAddAccess);
    if (rc != Success)
        return rc;
    if (!SAME_SCREENS(pWin->drawable, pParent->drawable))
        return BadMatch;
    if ((pWin->backgroundState == ParentRelative) &&
        (pParent->drawable.depth != pWin->drawable.depth))
        return BadMatch;
    if ((pWin->drawable.class != InputOnly) &&
        (pParent->drawable.class == InputOnly))
        return BadMatch;
    return ReparentWindow(pWin, pParent,
                          (short) stuff->x, (short) stuff->y, client);
}

int
ProcMapWindow(ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xResourceReq);
    int rc;

    REQUEST_SIZE_MATCH(xResourceReq);
    rc = dixLookupWindow(&pWin, stuff->id, client, DixShowAccess);
    if (rc != Success)
        return rc;
    MapWindow(pWin, client);
    /* update cache to say it is mapped */
    return Success;
}

int
ProcMapSubwindows(ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xResourceReq);
    int rc;

    REQUEST_SIZE_MATCH(xResourceReq);
    rc = dixLookupWindow(&pWin, stuff->id, client, DixListAccess);
    if (rc != Success)
        return rc;
    MapSubwindows(pWin, client);
    /* update cache to say it is mapped */
    return Success;
}

int
ProcUnmapWindow(ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xResourceReq);
    int rc;

    REQUEST_SIZE_MATCH(xResourceReq);
    rc = dixLookupWindow(&pWin, stuff->id, client, DixHideAccess);
    if (rc != Success)
        return rc;
    UnmapWindow(pWin, FALSE);
    /* update cache to say it is mapped */
    return Success;
}

int
ProcUnmapSubwindows(ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xResourceReq);
    int rc;

    REQUEST_SIZE_MATCH(xResourceReq);
    rc = dixLookupWindow(&pWin, stuff->id, client, DixListAccess);
    if (rc != Success)
        return rc;
    UnmapSubwindows(pWin);
    return Success;
}

int
ProcConfigureWindow(ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xConfigureWindowReq);
    int len, rc;

    REQUEST_AT_LEAST_SIZE(xConfigureWindowReq);
    rc = dixLookupWindow(&pWin, stuff->window, client,
                         DixManageAccess | DixSetAttrAccess);
    if (rc != Success)
        return rc;
    len = client->req_len - bytes_to_int32(sizeof(xConfigureWindowReq));
    if (Ones((Mask) stuff->mask) != len)
        return BadLength;
    return ConfigureWindow(pWin, (Mask) stuff->mask, (XID *) &stuff[1], client);
}

int
ProcCirculateWindow(ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xCirculateWindowReq);
    int rc;

    REQUEST_SIZE_MATCH(xCirculateWindowReq);
    if ((stuff->direction != RaiseLowest) && (stuff->direction != LowerHighest)) {
        client->errorValue = stuff->direction;
        return BadValue;
    }
    rc = dixLookupWindow(&pWin, stuff->window, client, DixManageAccess);
    if (rc != Success)
        return rc;
    CirculateWindow(pWin, (int) stuff->direction, client);
    return Success;
}

static int
GetGeometry(ClientPtr client, xGetGeometryReply * rep)
{
    DrawablePtr pDraw;
    int rc;

    REQUEST(xResourceReq);
    REQUEST_SIZE_MATCH(xResourceReq);

    rc = dixLookupDrawable(&pDraw, stuff->id, client, M_ANY, DixGetAttrAccess);
    if (rc != Success)
        return rc;

    rep->type = X_Reply;
    rep->length = 0;
    rep->sequenceNumber = client->sequence;
    rep->root = pDraw->pScreen->root->drawable.id;
    rep->depth = pDraw->depth;
    rep->width = pDraw->width;
    rep->height = pDraw->height;

    if (WindowDrawable(pDraw->type)) {
        WindowPtr pWin = (WindowPtr) pDraw;

        rep->x = pWin->origin.x - wBorderWidth(pWin);
        rep->y = pWin->origin.y - wBorderWidth(pWin);
        rep->borderWidth = pWin->borderWidth;
    }
    else {                      /* DRAWABLE_PIXMAP */

        rep->x = rep->y = rep->borderWidth = 0;
    }

    return Success;
}

int
ProcGetGeometry(ClientPtr client)
{
    xGetGeometryReply rep = { .type = X_Reply };
    int status;

    if ((status = GetGeometry(client, &rep)) != Success)
        return status;

    WriteReplyToClient(client, sizeof(xGetGeometryReply), &rep);
    return Success;
}

int
ProcQueryTree(ClientPtr client)
{
    xQueryTreeReply reply;
    int rc, numChildren = 0;
    WindowPtr pChild, pWin, pHead;
    Window *childIDs = (Window *) NULL;

    REQUEST(xResourceReq);

    REQUEST_SIZE_MATCH(xResourceReq);
    rc = dixLookupWindow(&pWin, stuff->id, client, DixListAccess);
    if (rc != Success)
        return rc;

    reply = (xQueryTreeReply) {
        .type = X_Reply,
        .sequenceNumber = client->sequence,
        .root = pWin->drawable.pScreen->root->drawable.id,
        .parent = (pWin->parent) ? pWin->parent->drawable.id : (Window) None
    };
    pHead = RealChildHead(pWin);
    for (pChild = pWin->lastChild; pChild != pHead; pChild = pChild->prevSib)
        numChildren++;
    if (numChildren) {
        int curChild = 0;

        childIDs = malloc(numChildren * sizeof(Window));
        if (!childIDs)
            return BadAlloc;
        for (pChild = pWin->lastChild; pChild != pHead;
             pChild = pChild->prevSib)
            childIDs[curChild++] = pChild->drawable.id;
    }

    reply.nChildren = numChildren;
    reply.length = bytes_to_int32(numChildren * sizeof(Window));

    WriteReplyToClient(client, sizeof(xQueryTreeReply), &reply);
    if (numChildren) {
        client->pSwapReplyFunc = (ReplySwapPtr) Swap32Write;
        WriteSwappedDataToClient(client, numChildren * sizeof(Window),
                                 childIDs);
        free(childIDs);
    }

    return Success;
}

int
ProcInternAtom(ClientPtr client)
{
    Atom atom;
    char *tchar;

    REQUEST(xInternAtomReq);

    REQUEST_FIXED_SIZE(xInternAtomReq, stuff->nbytes);
    if ((stuff->onlyIfExists != xTrue) && (stuff->onlyIfExists != xFalse)) {
        client->errorValue = stuff->onlyIfExists;
        return BadValue;
    }
    tchar = (char *) &stuff[1];
    atom = MakeAtom(tchar, stuff->nbytes, !stuff->onlyIfExists);
    if (atom != BAD_RESOURCE) {
        xInternAtomReply reply = {
            .type = X_Reply,
            .sequenceNumber = client->sequence,
            .length = 0,
            .atom = atom
        };
        WriteReplyToClient(client, sizeof(xInternAtomReply), &reply);
        return Success;
    }
    else
        return BadAlloc;
}

int
ProcGetAtomName(ClientPtr client)
{
    const char *str;

    REQUEST(xResourceReq);

    REQUEST_SIZE_MATCH(xResourceReq);
    if ((str = NameForAtom(stuff->id))) {
        int len = strlen(str);
        xGetAtomNameReply reply = {
            .type = X_Reply,
            .sequenceNumber = client->sequence,
            .length = bytes_to_int32(len),
            .nameLength = len
        };

        WriteReplyToClient(client, sizeof(xGetAtomNameReply), &reply);
        WriteToClient(client, len, str);
        return Success;
    }
    else {
        client->errorValue = stuff->id;
        return BadAtom;
    }
}

int
ProcGrabServer(ClientPtr client)
{
    int rc;

    REQUEST_SIZE_MATCH(xReq);
    if (grabState != GrabNone && client != grabClient) {
        ResetCurrentRequest(client);
        client->sequence--;
        BITSET(grabWaiters, client->index);
        IgnoreClient(client);
        return Success;
    }
    rc = OnlyListenToOneClient(client);
    if (rc != Success)
        return rc;
    grabState = GrabKickout;
    grabClient = client;

    if (ServerGrabCallback) {
        ServerGrabInfoRec grabinfo;

        grabinfo.client = client;
        grabinfo.grabstate = SERVER_GRABBED;
        CallCallbacks(&ServerGrabCallback, (void *) &grabinfo);
    }

    return Success;
}

static void
UngrabServer(ClientPtr client)
{
    int i;

    grabState = GrabNone;
    ListenToAllClients();
    for (i = mskcnt; --i >= 0 && !grabWaiters[i];);
    if (i >= 0) {
        i <<= 5;
        while (!GETBIT(grabWaiters, i))
            i++;
        BITCLEAR(grabWaiters, i);
        AttendClient(clients[i]);
    }

    if (ServerGrabCallback) {
        ServerGrabInfoRec grabinfo;

        grabinfo.client = client;
        grabinfo.grabstate = SERVER_UNGRABBED;
        CallCallbacks(&ServerGrabCallback, (void *) &grabinfo);
    }
}

int
ProcUngrabServer(ClientPtr client)
{
    REQUEST_SIZE_MATCH(xReq);
    UngrabServer(client);
    return Success;
}

int
ProcTranslateCoords(ClientPtr client)
{
    REQUEST(xTranslateCoordsReq);

    WindowPtr pWin, pDst;
    xTranslateCoordsReply rep;
    int rc;

    REQUEST_SIZE_MATCH(xTranslateCoordsReq);
    rc = dixLookupWindow(&pWin, stuff->srcWid, client, DixGetAttrAccess);
    if (rc != Success)
        return rc;
    rc = dixLookupWindow(&pDst, stuff->dstWid, client, DixGetAttrAccess);
    if (rc != Success)
        return rc;

    rep = (xTranslateCoordsReply) {
        .type = X_Reply,
        .sequenceNumber = client->sequence,
        .length = 0
    };
    if (!SAME_SCREENS(pWin->drawable, pDst->drawable)) {
        rep.sameScreen = xFalse;
        rep.child = None;
        rep.dstX = rep.dstY = 0;
    }
    else {
        INT16 x, y;

        rep.sameScreen = xTrue;
        rep.child = None;
        /* computing absolute coordinates -- adjust to destination later */
        x = pWin->drawable.x + stuff->srcX;
        y = pWin->drawable.y + stuff->srcY;
        pWin = pDst->firstChild;
        while (pWin) {
            BoxRec box;

            if ((pWin->mapped) &&
                (x >= pWin->drawable.x - wBorderWidth(pWin)) &&
                (x < pWin->drawable.x + (int) pWin->drawable.width +
                 wBorderWidth(pWin)) &&
                (y >= pWin->drawable.y - wBorderWidth(pWin)) &&
                (y < pWin->drawable.y + (int) pWin->drawable.height +
                 wBorderWidth(pWin))
                /* When a window is shaped, a further check
                 * is made to see if the point is inside
                 * borderSize
                 */
                && (!wBoundingShape(pWin) ||
                    RegionContainsPoint(&pWin->borderSize, x, y, &box))

                && (!wInputShape(pWin) ||
                    RegionContainsPoint(wInputShape(pWin),
                                        x - pWin->drawable.x,
                                        y - pWin->drawable.y, &box))
                ) {
                rep.child = pWin->drawable.id;
                pWin = (WindowPtr) NULL;
            }
            else
                pWin = pWin->nextSib;
        }
        /* adjust to destination coordinates */
        rep.dstX = x - pDst->drawable.x;
        rep.dstY = y - pDst->drawable.y;
    }
    WriteReplyToClient(client, sizeof(xTranslateCoordsReply), &rep);
    return Success;
}

int
ProcOpenFont(ClientPtr client)
{
    int err;

    REQUEST(xOpenFontReq);

    REQUEST_FIXED_SIZE(xOpenFontReq, stuff->nbytes);
    client->errorValue = stuff->fid;
    LEGAL_NEW_RESOURCE(stuff->fid, client);
    err = OpenFont(client, stuff->fid, (Mask) 0,
                   stuff->nbytes, (char *) &stuff[1]);
    if (err == Success) {
        return Success;
    }
    else
        return err;
}

int
ProcCloseFont(ClientPtr client)
{
    FontPtr pFont;
    int rc;

    REQUEST(xResourceReq);

    REQUEST_SIZE_MATCH(xResourceReq);
    rc = dixLookupResourceByType((void **) &pFont, stuff->id, RT_FONT,
                                 client, DixDestroyAccess);
    if (rc == Success) {
        FreeResource(stuff->id, RT_NONE);
        return Success;
    }
    else {
        client->errorValue = stuff->id;
        return rc;
    }
}

int
ProcQueryFont(ClientPtr client)
{
    xQueryFontReply *reply;
    FontPtr pFont;
    int rc;

    REQUEST(xResourceReq);
    REQUEST_SIZE_MATCH(xResourceReq);

    rc = dixLookupFontable(&pFont, stuff->id, client, DixGetAttrAccess);
    if (rc != Success)
        return rc;

    {
        xCharInfo *pmax = FONTINKMAX(pFont);
        xCharInfo *pmin = FONTINKMIN(pFont);
        int nprotoxcistructs;
        int rlength;

        nprotoxcistructs = (pmax->rightSideBearing == pmin->rightSideBearing &&
                            pmax->leftSideBearing == pmin->leftSideBearing &&
                            pmax->descent == pmin->descent &&
                            pmax->ascent == pmin->ascent &&
                            pmax->characterWidth == pmin->characterWidth) ?
            0 : N2dChars(pFont);

        rlength = sizeof(xQueryFontReply) +
            FONTINFONPROPS(FONTCHARSET(pFont)) * sizeof(xFontProp) +
            nprotoxcistructs * sizeof(xCharInfo);
        reply = calloc(1, rlength);
        if (!reply) {
            return BadAlloc;
        }

        reply->type = X_Reply;
        reply->length = bytes_to_int32(rlength - sizeof(xGenericReply));
        reply->sequenceNumber = client->sequence;
        QueryFont(pFont, reply, nprotoxcistructs);

        WriteReplyToClient(client, rlength, reply);
        free(reply);
        return Success;
    }
}

int
ProcQueryTextExtents(ClientPtr client)
{
    xQueryTextExtentsReply reply;
    FontPtr pFont;
    ExtentInfoRec info;
    unsigned long length;
    int rc;

    REQUEST(xQueryTextExtentsReq);
    REQUEST_AT_LEAST_SIZE(xQueryTextExtentsReq);

    rc = dixLookupFontable(&pFont, stuff->fid, client, DixGetAttrAccess);
    if (rc != Success)
        return rc;

    length = client->req_len - bytes_to_int32(sizeof(xQueryTextExtentsReq));
    length = length << 1;
    if (stuff->oddLength) {
        if (length == 0)
            return BadLength;
        length--;
    }
    if (!QueryTextExtents(pFont, length, (unsigned char *) &stuff[1], &info))
        return BadAlloc;
    reply = (xQueryTextExtentsReply) {
        .type = X_Reply,
        .drawDirection = info.drawDirection,
        .sequenceNumber = client->sequence,
        .length = 0,
        .fontAscent = info.fontAscent,
        .fontDescent = info.fontDescent,
        .overallAscent = info.overallAscent,
        .overallDescent = info.overallDescent,
        .overallWidth = info.overallWidth,
        .overallLeft = info.overallLeft,
        .overallRight = info.overallRight
    };
    WriteReplyToClient(client, sizeof(xQueryTextExtentsReply), &reply);
    return Success;
}

int
ProcListFonts(ClientPtr client)
{
    REQUEST(xListFontsReq);

    REQUEST_FIXED_SIZE(xListFontsReq, stuff->nbytes);

    return ListFonts(client, (unsigned char *) &stuff[1], stuff->nbytes,
                     stuff->maxNames);
}

int
ProcListFontsWithInfo(ClientPtr client)
{
    REQUEST(xListFontsWithInfoReq);

    REQUEST_FIXED_SIZE(xListFontsWithInfoReq, stuff->nbytes);

    return StartListFontsWithInfo(client, stuff->nbytes,
                                  (unsigned char *) &stuff[1], stuff->maxNames);
}

/**
 *
 *  \param value must conform to DeleteType
 */
int
dixDestroyPixmap(void *value, XID pid)
{
    PixmapPtr pPixmap = (PixmapPtr) value;

    return (*pPixmap->drawable.pScreen->DestroyPixmap) (pPixmap);
}

int
ProcCreatePixmap(ClientPtr client)
{
    PixmapPtr pMap;
    DrawablePtr pDraw;

    REQUEST(xCreatePixmapReq);
    DepthPtr pDepth;
    int i, rc;

    REQUEST_SIZE_MATCH(xCreatePixmapReq);
    client->errorValue = stuff->pid;
    LEGAL_NEW_RESOURCE(stuff->pid, client);

    rc = dixLookupDrawable(&pDraw, stuff->drawable, client, M_ANY,
                           DixGetAttrAccess);
    if (rc != Success)
        return rc;

    if (!stuff->width || !stuff->height) {
        client->errorValue = 0;
        return BadValue;
    }
    if (stuff->width > 32767 || stuff->height > 32767) {
        /* It is allowed to try and allocate a pixmap which is larger than
         * 32767 in either dimension. However, all of the framebuffer code
         * is buggy and does not reliably draw to such big pixmaps, basically
         * because the Region data structure operates with signed shorts
         * for the rectangles in it.
         *
         * Furthermore, several places in the X server computes the
         * size in bytes of the pixmap and tries to store it in an
         * integer. This integer can overflow and cause the allocated size
         * to be much smaller.
         *
         * So, such big pixmaps are rejected here with a BadAlloc
         */
        return BadAlloc;
    }
    if (stuff->depth != 1) {
        pDepth = pDraw->pScreen->allowedDepths;
        for (i = 0; i < pDraw->pScreen->numDepths; i++, pDepth++)
            if (pDepth->depth == stuff->depth)
                goto CreatePmap;
        client->errorValue = stuff->depth;
        return BadValue;
    }
 CreatePmap:
    pMap = (PixmapPtr) (*pDraw->pScreen->CreatePixmap)
        (pDraw->pScreen, stuff->width, stuff->height, stuff->depth, 0);
    if (pMap) {
        pMap->drawable.serialNumber = NEXT_SERIAL_NUMBER;
        pMap->drawable.id = stuff->pid;
        /* security creation/labeling check */
        rc = XaceHook(XACE_RESOURCE_ACCESS, client, stuff->pid, RT_PIXMAP,
                      pMap, RT_NONE, NULL, DixCreateAccess);
        if (rc != Success) {
            (*pDraw->pScreen->DestroyPixmap) (pMap);
            return rc;
        }
        if (AddResource(stuff->pid, RT_PIXMAP, (void *) pMap))
            return Success;
    }
    return BadAlloc;
}

int
ProcFreePixmap(ClientPtr client)
{
    PixmapPtr pMap;
    int rc;

    REQUEST(xResourceReq);
    REQUEST_SIZE_MATCH(xResourceReq);

    rc = dixLookupResourceByType((void **) &pMap, stuff->id, RT_PIXMAP,
                                 client, DixDestroyAccess);
    if (rc == Success) {
        FreeResource(stuff->id, RT_NONE);
        return Success;
    }
    else {
        client->errorValue = stuff->id;
        return rc;
    }
}

int
ProcCreateGC(ClientPtr client)
{
    int error, rc;
    GC *pGC;
    DrawablePtr pDraw;
    unsigned len;

    REQUEST(xCreateGCReq);

    REQUEST_AT_LEAST_SIZE(xCreateGCReq);
    client->errorValue = stuff->gc;
    LEGAL_NEW_RESOURCE(stuff->gc, client);
    rc = dixLookupDrawable(&pDraw, stuff->drawable, client, 0,
                           DixGetAttrAccess);
    if (rc != Success)
        return rc;

    len = client->req_len - bytes_to_int32(sizeof(xCreateGCReq));
    if (len != Ones(stuff->mask))
        return BadLength;
    pGC = (GC *) CreateGC(pDraw, stuff->mask, (XID *) &stuff[1], &error,
                          stuff->gc, client);
    if (error != Success)
        return error;
    if (!AddResource(stuff->gc, RT_GC, (void *) pGC))
        return BadAlloc;
    return Success;
}

int
ProcChangeGC(ClientPtr client)
{
    GC *pGC;
    int result;
    unsigned len;

    REQUEST(xChangeGCReq);
    REQUEST_AT_LEAST_SIZE(xChangeGCReq);

    result = dixLookupGC(&pGC, stuff->gc, client, DixSetAttrAccess);
    if (result != Success)
        return result;

    len = client->req_len - bytes_to_int32(sizeof(xChangeGCReq));
    if (len != Ones(stuff->mask))
        return BadLength;

    return ChangeGCXIDs(client, pGC, stuff->mask, (CARD32 *) &stuff[1]);
}

int
ProcCopyGC(ClientPtr client)
{
    GC *dstGC;
    GC *pGC;
    int result;

    REQUEST(xCopyGCReq);
    REQUEST_SIZE_MATCH(xCopyGCReq);

    result = dixLookupGC(&pGC, stuff->srcGC, client, DixGetAttrAccess);
    if (result != Success)
        return result;
    result = dixLookupGC(&dstGC, stuff->dstGC, client, DixSetAttrAccess);
    if (result != Success)
        return result;
    if ((dstGC->pScreen != pGC->pScreen) || (dstGC->depth != pGC->depth))
        return BadMatch;
    if (stuff->mask & ~GCAllBits) {
        client->errorValue = stuff->mask;
        return BadValue;
    }
    return CopyGC(pGC, dstGC, stuff->mask);
}

int
ProcSetDashes(ClientPtr client)
{
    GC *pGC;
    int result;

    REQUEST(xSetDashesReq);

    REQUEST_FIXED_SIZE(xSetDashesReq, stuff->nDashes);
    if (stuff->nDashes == 0) {
        client->errorValue = 0;
        return BadValue;
    }

    result = dixLookupGC(&pGC, stuff->gc, client, DixSetAttrAccess);
    if (result != Success)
        return result;

    /* If there's an error, either there's no sensible errorValue,
     * or there was a dash segment of 0. */
    client->errorValue = 0;
    return SetDashes(pGC, stuff->dashOffset, stuff->nDashes,
                     (unsigned char *) &stuff[1]);
}

int
ProcSetClipRectangles(ClientPtr client)
{
    int nr, result;
    GC *pGC;

    REQUEST(xSetClipRectanglesReq);

    REQUEST_AT_LEAST_SIZE(xSetClipRectanglesReq);
    if ((stuff->ordering != Unsorted) && (stuff->ordering != YSorted) &&
        (stuff->ordering != YXSorted) && (stuff->ordering != YXBanded)) {
        client->errorValue = stuff->ordering;
        return BadValue;
    }
    result = dixLookupGC(&pGC, stuff->gc, client, DixSetAttrAccess);
    if (result != Success)
        return result;

    nr = (client->req_len << 2) - sizeof(xSetClipRectanglesReq);
    if (nr & 4)
        return BadLength;
    nr >>= 3;
    return SetClipRects(pGC, stuff->xOrigin, stuff->yOrigin,
                        nr, (xRectangle *) &stuff[1], (int) stuff->ordering);
}

int
ProcFreeGC(ClientPtr client)
{
    GC *pGC;
    int rc;

    REQUEST(xResourceReq);
    REQUEST_SIZE_MATCH(xResourceReq);

    rc = dixLookupGC(&pGC, stuff->id, client, DixDestroyAccess);
    if (rc != Success)
        return rc;

    FreeResource(stuff->id, RT_NONE);
    return Success;
}

int
ProcClearToBackground(ClientPtr client)
{
    REQUEST(xClearAreaReq);
    WindowPtr pWin;
    int rc;

    REQUEST_SIZE_MATCH(xClearAreaReq);
    rc = dixLookupWindow(&pWin, stuff->window, client, DixWriteAccess);
    if (rc != Success)
        return rc;
    if (pWin->drawable.class == InputOnly) {
        client->errorValue = stuff->window;
        return BadMatch;
    }
    if ((stuff->exposures != xTrue) && (stuff->exposures != xFalse)) {
        client->errorValue = stuff->exposures;
        return BadValue;
    }
    (*pWin->drawable.pScreen->ClearToBackground) (pWin, stuff->x, stuff->y,
                                                  stuff->width, stuff->height,
                                                  (Bool) stuff->exposures);
    return Success;
}

int
ProcCopyArea(ClientPtr client)
{
    DrawablePtr pDst;
    DrawablePtr pSrc;
    GC *pGC;

    REQUEST(xCopyAreaReq);
    RegionPtr pRgn;
    int rc;

    REQUEST_SIZE_MATCH(xCopyAreaReq);

    VALIDATE_DRAWABLE_AND_GC(stuff->dstDrawable, pDst, DixWriteAccess);
    if (stuff->dstDrawable != stuff->srcDrawable) {
        rc = dixLookupDrawable(&pSrc, stuff->srcDrawable, client, 0,
                               DixReadAccess);
        if (rc != Success)
            return rc;
        if ((pDst->pScreen != pSrc->pScreen) || (pDst->depth != pSrc->depth)) {
            client->errorValue = stuff->dstDrawable;
            return BadMatch;
        }
    }
    else
        pSrc = pDst;

    pRgn = (*pGC->ops->CopyArea) (pSrc, pDst, pGC, stuff->srcX, stuff->srcY,
                                  stuff->width, stuff->height,
                                  stuff->dstX, stuff->dstY);
    if (pGC->graphicsExposures) {
        (*pDst->pScreen->SendGraphicsExpose)
            (client, pRgn, stuff->dstDrawable, X_CopyArea, 0);
        if (pRgn)
            RegionDestroy(pRgn);
    }

    return Success;
}

int
ProcCopyPlane(ClientPtr client)
{
    DrawablePtr psrcDraw, pdstDraw;
    GC *pGC;

    REQUEST(xCopyPlaneReq);
    RegionPtr pRgn;
    int rc;

    REQUEST_SIZE_MATCH(xCopyPlaneReq);

    VALIDATE_DRAWABLE_AND_GC(stuff->dstDrawable, pdstDraw, DixWriteAccess);
    if (stuff->dstDrawable != stuff->srcDrawable) {
        rc = dixLookupDrawable(&psrcDraw, stuff->srcDrawable, client, 0,
                               DixReadAccess);
        if (rc != Success)
            return rc;

        if (pdstDraw->pScreen != psrcDraw->pScreen) {
            client->errorValue = stuff->dstDrawable;
            return BadMatch;
        }
    }
    else
        psrcDraw = pdstDraw;

    /* Check to see if stuff->bitPlane has exactly ONE good bit set */
    if (stuff->bitPlane == 0 || (stuff->bitPlane & (stuff->bitPlane - 1)) ||
        (stuff->bitPlane > (1L << (psrcDraw->depth - 1)))) {
        client->errorValue = stuff->bitPlane;
        return BadValue;
    }

    pRgn =
        (*pGC->ops->CopyPlane) (psrcDraw, pdstDraw, pGC, stuff->srcX,
                                stuff->srcY, stuff->width, stuff->height,
                                stuff->dstX, stuff->dstY, stuff->bitPlane);
    if (pGC->graphicsExposures) {
        (*pdstDraw->pScreen->SendGraphicsExpose)
            (client, pRgn, stuff->dstDrawable, X_CopyPlane, 0);
        if (pRgn)
            RegionDestroy(pRgn);
    }
    return Success;
}

int
ProcPolyPoint(ClientPtr client)
{
    int npoint;
    GC *pGC;
   …