TinyX/dix/dispatch.c

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

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.

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

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#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"

#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))

extern xConnSetupPrefix connSetupPrefix;

extern char *ConnectionInfo;

_X_EXPORT Selection *CurrentSelections;

_X_EXPORT int NumCurrentSelections;

CallbackListPtr SelectionCallback = NULL;

static ClientPtr grabClient;

#define GrabNone 0
#define GrabActive 1
#define GrabKickout 2
static int grabState = GrabNone;

static long grabWaiters[mskcnt];

_X_EXPORT CallbackListPtr ServerGrabCallback = NULL;

HWEventQueuePtr checkForInput[2];

extern int connBlockScreenStart;

static void KillAllClients(void);

static void DeleteClientFromAnySelections(ClientPtr client);

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

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

_X_EXPORT 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.
 */
_X_EXPORT volatile char dispatchException = 0;

_X_EXPORT volatile char isItTimeToYield;

/* Various of the DIX function interfaces were not designed to allow
 * the client->errorValue to be set on BadValue and other errors.
 * Rather than changing interfaces and breaking untold code we introduce
 * a new global that dispatch can use.
 */
XID clientErrorValue;           /* XXX this is a kludge */

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

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

_X_EXPORT void
UpdateCurrentTime()
{
    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 */
_X_EXPORT void
UpdateCurrentTimeIf()
{
    TimeStamp systime;

    systime.months = currentTime.months;
    systime.milliseconds = GetTimeInMillis();
    if (systime.milliseconds < currentTime.milliseconds)
        systime.months++;
    if (*checkForInput[0] == *checkForInput[1])
        currentTime = systime;
}

void
InitSelections()
{
    if (CurrentSelections)
        free(CurrentSelections);
    CurrentSelections = (Selection *) NULL;
    NumCurrentSelections = 0;
}

void
FlushClientCaches(XID id)
{
    int i;

    ClientPtr client;

    client = clients[CLIENT_ID(id)];
    if (client == NullClient)
        return;
    for (i = 0; i < currentMaxClients; i++) {
        client = clients[i];
        if (client != NullClient) {
            if (client->lastDrawableID == id) {
                client->lastDrawableID = WindowTable[0]->drawable.id;
                client->lastDrawable = (DrawablePtr) WindowTable[0];
            }
            else if (client->lastGCID == id) {
                client->lastGCID = INVALID;
                client->lastGC = (GCPtr) NULL;
            }
        }
    }
}

#ifdef SMART_SCHEDULE

#undef SMART_DEBUG

#define SMART_SCHEDULE_DEFAULT_INTERVAL	7      /* ms */
#define SMART_SCHEDULE_MAX_SLICE	20     /* ms */

Bool SmartScheduleDisable = FALSE;

long SmartScheduleSlice = SMART_SCHEDULE_DEFAULT_INTERVAL;

long SmartScheduleInterval = SMART_SCHEDULE_DEFAULT_INTERVAL;

long SmartScheduleMaxSlice = SMART_SCHEDULE_MAX_SLICE;

long SmartScheduleTime;

ClientPtr SmartLastClient;

int SmartLastIndex[SMART_MAX_PRIORITY - SMART_MIN_PRIORITY + 1];

int SmartScheduleClient(int *clientReady, int nready);

#ifdef SMART_DEBUG
long SmartLastPrint;
#endif

void Dispatch(void);

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 are idle */
        if ((now - pClient->smart_check_tick) >= idle) {
            if (pClient->smart_priority < 0)
                pClient->smart_priority++;
        }
        pClient->smart_check_tick = now;

        /* 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) {
        /*
         * 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;
}
#endif

#define MAJOROP ((xReq *)client->requestBuffer)->reqType

void
Dispatch(void)
{
    int *clientReady;  /* array of request ready clients */

    int result;

    ClientPtr client;

    int nready;

    HWEventQueuePtr *icheck = checkForInput;

#ifdef SMART_SCHEDULE
    long start_tick;
#endif

    nextFreeClientID = 1;
    InitSelections();
    nClients = 0;

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

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

        nready = WaitForSomething(clientReady);

#ifdef SMART_SCHEDULE
        if (nready && !SmartScheduleDisable) {
            clientReady[0] = SmartScheduleClient(clientReady, nready);
            nready = 1;
        }
#endif
       /*****************
	*  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;

            requestingClient = client;
#ifdef SMART_SCHEDULE
            start_tick = SmartScheduleTime;
#endif
            while (!isItTimeToYield) {
                if (*icheck[0] != *icheck[1]) {
                    ProcessInputEvents();
                    FlushIfCriticalOutputPending();
                }
#ifdef SMART_SCHEDULE
                if (!SmartScheduleDisable &&
                    (SmartScheduleTime - start_tick) >= SmartScheduleSlice) {
                    /* Penalize clients which consume ticks */
                    if (client->smart_priority > SMART_MIN_PRIORITY)
                        client->smart_priority--;
                    break;
                }
#endif
                /* now, finally, deal with client requests */

                result = ReadRequestFromClient(client);
                if (result <= 0) {
                    if (result < 0)
                        CloseDownClient(client);
                    break;
                }

                client->sequence++;
#ifdef DEBUG
                if (client->requestLogIndex == MAX_REQUEST_LOG)
                    client->requestLogIndex = 0;
                client->requestLog[client->requestLogIndex] = MAJOROP;
                client->requestLogIndex++;
#endif
                if (result > (maxBigRequestSize << 2))
                    result = BadLength;
                else
                    result = (*client->requestVector[MAJOROP]) (client);

                if (result != Success) {
                    if (client->noClientException != Success)
                        CloseDownClient(client);
                    else
                        SendErrorToClient(client, MAJOROP,
                                          MinorOpcodeOfRequest(client),
                                          client->errorValue, result);
                    break;
                }
            }
            FlushAllOutput();
#ifdef SMART_SCHEDULE
            client = clients[clientReady[nready]];
            if (client)
                client->smart_stop_tick = SmartScheduleTime;
#endif
            requestingClient = NULL;
        }
        dispatchException &= ~DE_PRIORITYCHANGE;
    }
    KillAllClients();
    DEALLOCATE_LOCAL(clientReady);
    dispatchException &= ~DE_RESET;
    ResetOsBuffers();
}

#undef MAJOROP

_X_EXPORT int
ProcBadRequest(ClientPtr client)
{
    return (BadRequest);
}

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

    REQUEST(xCreateWindowReq);
    int result;

    int len;

    REQUEST_AT_LEAST_SIZE(xCreateWindowReq);

    LEGAL_NEW_RESOURCE(stuff->wid, client);
    if (!(pParent = (WindowPtr) SecurityLookupWindow(stuff->parent, client,
                                                     SecurityWriteAccess)))
        return BadWindow;
    len = client->req_len - (sizeof(xCreateWindowReq) >> 2);
    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, &result);
    if (pWin) {
        Mask mask = pWin->eventMask;

        pWin->eventMask = 0;    /* subterfuge in case AddResource fails */
        if (!AddResource(stuff->wid, RT_WINDOW, (pointer) pWin))
            return BadAlloc;
        pWin->eventMask = mask;
    }
    if (client->noClientException != Success)
        return (client->noClientException);
    else
        return (result);
}

int
ProcChangeWindowAttributes(register ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xChangeWindowAttributesReq);
    int result;

    int len;

    REQUEST_AT_LEAST_SIZE(xChangeWindowAttributesReq);
    pWin = (WindowPtr) SecurityLookupWindow(stuff->window, client,
                                            SecurityWriteAccess);
    if (!pWin)
        return (BadWindow);
    len = client->req_len - (sizeof(xChangeWindowAttributesReq) >> 2);
    if (len != Ones(stuff->valueMask))
        return BadLength;
    result = ChangeWindowAttributes(pWin,
                                    stuff->valueMask,
                                    (XID *) &stuff[1], client);
    if (client->noClientException != Success)
        return (client->noClientException);
    else
        return (result);
}

int
ProcGetWindowAttributes(register ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xResourceReq);
    xGetWindowAttributesReply wa = {0};

    REQUEST_SIZE_MATCH(xResourceReq);
    pWin = (WindowPtr) SecurityLookupWindow(stuff->id, client,
                                            SecurityReadAccess);
    if (!pWin)
        return (BadWindow);
    GetWindowAttributes(pWin, client, &wa);
    WriteReplyToClient(client, sizeof(xGetWindowAttributesReply), &wa);
    return (client->noClientException);
}

int
ProcDestroyWindow(register ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xResourceReq);

    REQUEST_SIZE_MATCH(xResourceReq);
    pWin = (WindowPtr) SecurityLookupWindow(stuff->id, client,
                                            SecurityDestroyAccess);
    if (!pWin)
        return (BadWindow);
    if (pWin->parent)
        FreeResource(stuff->id, RT_NONE);
    return (client->noClientException);
}

int
ProcDestroySubwindows(register ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xResourceReq);

    REQUEST_SIZE_MATCH(xResourceReq);
    pWin = (WindowPtr) SecurityLookupWindow(stuff->id, client,
                                            SecurityDestroyAccess);
    if (!pWin)
        return (BadWindow);
    DestroySubwindows(pWin, client);
    return (client->noClientException);
}

int
ProcChangeSaveSet(register ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xChangeSaveSetReq);
    int result;

    REQUEST_SIZE_MATCH(xChangeSaveSetReq);
    pWin = (WindowPtr) SecurityLookupWindow(stuff->window, client,
                                            SecurityReadAccess);
    if (!pWin)
        return (BadWindow);
    if (client->clientAsMask == (CLIENT_BITS(pWin->drawable.id)))
        return BadMatch;
    if ((stuff->mode == SetModeInsert) || (stuff->mode == SetModeDelete)) {
        result = AlterSaveSetForClient(client, pWin, stuff->mode, FALSE, TRUE);
        if (client->noClientException != Success)
            return (client->noClientException);
        else
            return (result);
    }
    else {
        client->errorValue = stuff->mode;
        return (BadValue);
    }
}

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

    REQUEST(xReparentWindowReq);
    int result;

    REQUEST_SIZE_MATCH(xReparentWindowReq);
    pWin = (WindowPtr) SecurityLookupWindow(stuff->window, client,
                                            SecurityWriteAccess);
    if (!pWin)
        return (BadWindow);
    pParent = (WindowPtr) SecurityLookupWindow(stuff->parent, client,
                                               SecurityWriteAccess);
    if (!pParent)
        return (BadWindow);
    if (SAME_SCREENS(pWin->drawable, pParent->drawable)) {
        if ((pWin->backgroundState == ParentRelative) &&
            (pParent->drawable.depth != pWin->drawable.depth))
            return BadMatch;
        if ((pWin->drawable.class != InputOnly) &&
            (pParent->drawable.class == InputOnly))
            return BadMatch;
        result = ReparentWindow(pWin, pParent,
                                (short) stuff->x, (short) stuff->y, client);
        if (client->noClientException != Success)
            return (client->noClientException);
        else
            return (result);
    }
    else
        return (BadMatch);
}

int
ProcMapWindow(register ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xResourceReq);

    REQUEST_SIZE_MATCH(xResourceReq);
    pWin = (WindowPtr) SecurityLookupWindow(stuff->id, client,
                                            SecurityReadAccess);
    if (!pWin)
        return (BadWindow);
    MapWindow(pWin, client);
    /* update cache to say it is mapped */
    return (client->noClientException);
}

int
ProcMapSubwindows(register ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xResourceReq);

    REQUEST_SIZE_MATCH(xResourceReq);
    pWin = (WindowPtr) SecurityLookupWindow(stuff->id, client,
                                            SecurityReadAccess);
    if (!pWin)
        return (BadWindow);
    MapSubwindows(pWin, client);
    /* update cache to say it is mapped */
    return (client->noClientException);
}

int
ProcUnmapWindow(register ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xResourceReq);

    REQUEST_SIZE_MATCH(xResourceReq);
    pWin = (WindowPtr) SecurityLookupWindow(stuff->id, client,
                                            SecurityReadAccess);
    if (!pWin)
        return (BadWindow);
    UnmapWindow(pWin, FALSE);
    /* update cache to say it is mapped */
    return (client->noClientException);
}

int
ProcUnmapSubwindows(register ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xResourceReq);

    REQUEST_SIZE_MATCH(xResourceReq);
    pWin = (WindowPtr) SecurityLookupWindow(stuff->id, client,
                                            SecurityReadAccess);
    if (!pWin)
        return (BadWindow);
    UnmapSubwindows(pWin);
    return (client->noClientException);
}

int
ProcConfigureWindow(register ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xConfigureWindowReq);
    int result;

    int len;

    REQUEST_AT_LEAST_SIZE(xConfigureWindowReq);
    pWin = (WindowPtr) SecurityLookupWindow(stuff->window, client,
                                            SecurityWriteAccess);
    if (!pWin)
        return (BadWindow);
    len = client->req_len - (sizeof(xConfigureWindowReq) >> 2);
    if (Ones((Mask) stuff->mask) != len)
        return BadLength;
    result = ConfigureWindow(pWin, (Mask) stuff->mask, (XID *) &stuff[1],
                             client);
    if (client->noClientException != Success)
        return (client->noClientException);
    else
        return (result);
}

int
ProcCirculateWindow(register ClientPtr client)
{
    WindowPtr pWin;

    REQUEST(xCirculateWindowReq);

    REQUEST_SIZE_MATCH(xCirculateWindowReq);
    if ((stuff->direction != RaiseLowest) && (stuff->direction != LowerHighest)) {
        client->errorValue = stuff->direction;
        return BadValue;
    }
    pWin = (WindowPtr) SecurityLookupWindow(stuff->window, client,
                                            SecurityWriteAccess);
    if (!pWin)
        return (BadWindow);
    CirculateWindow(pWin, (int) stuff->direction, client);
    return (client->noClientException);
}

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

    REQUEST(xResourceReq);

    REQUEST_SIZE_MATCH(xResourceReq);
    SECURITY_VERIFY_GEOMETRABLE(pDraw, stuff->id, client, SecurityReadAccess);
    rep->type = X_Reply;
    rep->length = 0;
    rep->sequenceNumber = client->sequence;
    rep->root = WindowTable[pDraw->pScreen->myNum]->drawable.id;
    rep->depth = pDraw->depth;
    rep->width = pDraw->width;
    rep->height = pDraw->height;

    /* XXX - Because the pixmap-implementation of the multibuffer extension
     *       may have the buffer-id's drawable resource value be a pointer
     *       to the buffer's window instead of the buffer itself
     *       (this happens if the buffer is the displayed buffer),
     *       we also have to check that the id matches before we can
     *       truly say that it is a DRAWABLE_WINDOW.
     */

    if ((pDraw->type == UNDRAWABLE_WINDOW) ||
        ((pDraw->type == DRAWABLE_WINDOW) && (stuff->id == pDraw->id))) {
        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 or DRAWABLE_BUFFER */

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

    return Success;
}

int
ProcGetGeometry(register ClientPtr client)
{
    xGetGeometryReply rep = {0};

    int status;

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

    WriteReplyToClient(client, sizeof(xGetGeometryReply), &rep);
    return (client->noClientException);
}

int
ProcQueryTree(register ClientPtr client)
{
    xQueryTreeReply reply;

    int numChildren = 0;

    WindowPtr pChild, pWin, pHead;

    Window *childIDs = (Window *) NULL;

    REQUEST(xResourceReq);

    REQUEST_SIZE_MATCH(xResourceReq);
    pWin = (WindowPtr) SecurityLookupWindow(stuff->id, client,
                                            SecurityReadAccess);
    if (!pWin)
        return (BadWindow);
    reply.type = X_Reply;
    reply.root = WindowTable[pWin->drawable.pScreen->myNum]->drawable.id;
    reply.sequenceNumber = client->sequence;
    if (pWin->parent)
        reply.parent = pWin->parent->drawable.id;
    else
        reply.parent = (Window) None;
    pHead = RealChildHead(pWin);
    for (pChild = pWin->lastChild; pChild != pHead; pChild = pChild->prevSib)
        numChildren++;
    if (numChildren) {
        int curChild = 0;

        childIDs = (Window *) ALLOCATE_LOCAL(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 = (numChildren * sizeof(Window)) >> 2;

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

    return (client->noClientException);
}

int
ProcInternAtom(register 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 = {0};

        reply.type = X_Reply;
        reply.length = 0;
        reply.sequenceNumber = client->sequence;
        reply.atom = atom;
        WriteReplyToClient(client, sizeof(xInternAtomReply), &reply);
        return (client->noClientException);
    }
    else
        return (BadAlloc);
}

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

    xGetAtomNameReply reply;

    int len;

    REQUEST(xResourceReq);

    REQUEST_SIZE_MATCH(xResourceReq);
    if ((str = NameForAtom(stuff->id))) {
        len = strlen(str);
        reply.type = X_Reply;
        reply.length = (len + 3) >> 2;
        reply.sequenceNumber = client->sequence;
        reply.nameLength = len;
        WriteReplyToClient(client, sizeof(xGetAtomNameReply), &reply);
        (void) WriteToClient(client, len, str);
        return (client->noClientException);
    }
    else {
        client->errorValue = stuff->id;
        return (BadAtom);
    }
}


int
ProcSetSelectionOwner(register ClientPtr client)
{
    WindowPtr pWin;

    TimeStamp time;

    REQUEST(xSetSelectionOwnerReq);

    REQUEST_SIZE_MATCH(xSetSelectionOwnerReq);
    UpdateCurrentTime();
    time = ClientTimeToServerTime(stuff->time);

    /* If the client's time stamp is in the future relative to the server's
       time stamp, do not set the selection, just return success. */
    if (CompareTimeStamps(time, currentTime) == LATER)
        return Success;
    if (stuff->window != None) {
        pWin = (WindowPtr) SecurityLookupWindow(stuff->window, client,
                                                SecurityReadAccess);
        if (!pWin)
            return (BadWindow);
    }
    else
        pWin = (WindowPtr) None;
    if (ValidAtom(stuff->selection)) {
        int i = 0;

        /*
         * First, see if the selection is already set...
         */
        while ((i < NumCurrentSelections) &&
               CurrentSelections[i].selection != stuff->selection)
            i++;
        if (i < NumCurrentSelections) {
            xEvent event;

            /* If the timestamp in client's request is in the past relative
               to the time stamp indicating the last time the owner of the
               selection was set, do not set the selection, just return
               success. */
            if (CompareTimeStamps(time, CurrentSelections[i].lastTimeChanged)
                == EARLIER)
                return Success;
            if (CurrentSelections[i].client &&
                (!pWin || (CurrentSelections[i].client != client))) {
                event.u.u.type = SelectionClear;
                event.u.selectionClear.time = time.milliseconds;
                event.u.selectionClear.window = CurrentSelections[i].window;
                event.u.selectionClear.atom = CurrentSelections[i].selection;
                (void) TryClientEvents(CurrentSelections[i].client, &event, 1,
                                       NoEventMask,
                                       NoEventMask /* CantBeFiltered */ ,
                                       NullGrab);
            }
        }
        else {
            /*
             * It doesn't exist, so add it...
             */
            Selection *newsels;

            if (i == 0)
                newsels = malloc(sizeof(Selection));
            else
                newsels = (Selection *) realloc(CurrentSelections,
                                                 (NumCurrentSelections +
                                                  1) * sizeof(Selection));
            if (!newsels)
                return BadAlloc;
            NumCurrentSelections++;
            CurrentSelections = newsels;
            CurrentSelections[i].selection = stuff->selection;
        }
        CurrentSelections[i].lastTimeChanged = time;
        CurrentSelections[i].window = stuff->window;
        CurrentSelections[i].pWin = pWin;
        CurrentSelections[i].client = (pWin ? client : NullClient);
        if (SelectionCallback) {
            SelectionInfoRec info;

            info.selection = &CurrentSelections[i];
            info.kind = SelectionSetOwner;
            CallCallbacks(&SelectionCallback, &info);
        }
        return (client->noClientException);
    }
    else {
        client->errorValue = stuff->selection;
        return (BadAtom);
    }
}

int
ProcGetSelectionOwner(register ClientPtr client)
{
    REQUEST(xResourceReq);

    REQUEST_SIZE_MATCH(xResourceReq);
    if (ValidAtom(stuff->id)) {
        int i;

        xGetSelectionOwnerReply reply;

        i = 0;
        while ((i < NumCurrentSelections) &&
               CurrentSelections[i].selection != stuff->id)
            i++;
        reply.type = X_Reply;
        reply.length = 0;
        reply.sequenceNumber = client->sequence;
        if (i < NumCurrentSelections)
            reply.owner = CurrentSelections[i].window;
        else
            reply.owner = None;
        WriteReplyToClient(client, sizeof(xGetSelectionOwnerReply), &reply);
        return (client->noClientException);
    }
    else {
        client->errorValue = stuff->id;
        return (BadAtom);
    }
}

int
ProcConvertSelection(register ClientPtr client)
{
    Bool paramsOkay;

    xEvent event;

    WindowPtr pWin;

    REQUEST(xConvertSelectionReq);

    REQUEST_SIZE_MATCH(xConvertSelectionReq);
    pWin = (WindowPtr) SecurityLookupWindow(stuff->requestor, client,
                                            SecurityReadAccess);
    if (!pWin)
        return (BadWindow);

    paramsOkay = (ValidAtom(stuff->selection) && ValidAtom(stuff->target));
    if (stuff->property != None)
        paramsOkay &= ValidAtom(stuff->property);
    if (paramsOkay) {
        int i;

        i = 0;
        while ((i < NumCurrentSelections) &&
               CurrentSelections[i].selection != stuff->selection)
            i++;
        if ((i < NumCurrentSelections) && (CurrentSelections[i].window != None)
            ) {
            event.u.u.type = SelectionRequest;
            event.u.selectionRequest.time = stuff->time;
            event.u.selectionRequest.owner = CurrentSelections[i].window;
            event.u.selectionRequest.requestor = stuff->requestor;
            event.u.selectionRequest.selection = stuff->selection;
            event.u.selectionRequest.target = stuff->target;
            event.u.selectionRequest.property = stuff->property;
            if (TryClientEvents
                (CurrentSelections[i].client, &event, 1, NoEventMask,
                 NoEventMask /* CantBeFiltered */ , NullGrab))
                return (client->noClientException);
        }
        event.u.u.type = SelectionNotify;
        event.u.selectionNotify.time = stuff->time;
        event.u.selectionNotify.requestor = stuff->requestor;
        event.u.selectionNotify.selection = stuff->selection;
        event.u.selectionNotify.target = stuff->target;
        event.u.selectionNotify.property = None;
        (void) TryClientEvents(client, &event, 1, NoEventMask,
                               NoEventMask /* CantBeFiltered */ , NullGrab);
        return (client->noClientException);
    }
    else {
        client->errorValue = stuff->property;
        return (BadAtom);
    }
}

int
ProcGrabServer(register ClientPtr client)
{
    REQUEST_SIZE_MATCH(xReq);
    if (grabState != GrabNone && client != grabClient) {
        ResetCurrentRequest(client);
        client->sequence--;
        BITSET(grabWaiters, client->index);
        IgnoreClient(client);
        return (client->noClientException);
    }
    OnlyListenToOneClient(client);
    grabState = GrabKickout;
    grabClient = client;

    if (ServerGrabCallback) {
        ServerGrabInfoRec grabinfo;

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

    return (client->noClientException);
}

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;