diff options
Diffstat (limited to 'xorg-server/dix/grabs.c')
| -rw-r--r-- | xorg-server/dix/grabs.c | 1120 |
1 files changed, 560 insertions, 560 deletions
diff --git a/xorg-server/dix/grabs.c b/xorg-server/dix/grabs.c index 4a351d647..1bc4998b2 100644 --- a/xorg-server/dix/grabs.c +++ b/xorg-server/dix/grabs.c @@ -1,560 +1,560 @@ -/* - -Copyright 1987, 1998 The Open Group - -Permission to use, copy, modify, distribute, and sell this software and its -documentation for any purpose is hereby granted without fee, provided that -the above copyright notice appear in all copies and that both that -copyright notice and this permission notice appear in supporting -documentation. - -The above copyright notice and this permission notice shall be included -in all copies or substantial portions of the Software. - -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS -OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF -MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. -IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR -OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, -ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR -OTHER DEALINGS IN THE SOFTWARE. - -Except as contained in this notice, the name of The Open Group shall -not be used in advertising or otherwise to promote the sale, use or -other dealings in this Software without prior written authorization -from The Open Group. - - -Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts, - - All Rights Reserved - -Permission to use, copy, modify, and distribute this software and its -documentation for any purpose and without fee is hereby granted, -provided that the above copyright notice appear in all copies and that -both that copyright notice and this permission notice appear in -supporting documentation, and that the name of Digital not be -used in advertising or publicity pertaining to distribution of the -software without specific, written prior permission. -DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING -ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL -DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR -ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, -WHETHER IN AN action OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, -ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS -SOFTWARE. - -*/ - -#ifdef HAVE_DIX_CONFIG_H -#include <dix-config.h> -#endif - -#include <X11/X.h> -#include "misc.h" -#include <X11/Xproto.h> -#include <X11/extensions/XI2.h> -#include "windowstr.h" -#include "inputstr.h" -#include "cursorstr.h" -#include "dixgrabs.h" -#include "xace.h" -#include "exevents.h" - -#define BITMASK(i) (((Mask)1) << ((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)) - -GrabPtr -CreateGrab( - int client, - DeviceIntPtr device, - DeviceIntPtr modDevice, - WindowPtr window, - GrabType grabtype, - GrabMask *mask, - GrabParameters *param, - int type, - KeyCode keybut, /* key or button */ - WindowPtr confineTo, - CursorPtr cursor) -{ - GrabPtr grab; - - grab = xcalloc(1, sizeof(GrabRec)); - if (!grab) - return (GrabPtr)NULL; - grab->resource = FakeClientID(client); - grab->device = device; - grab->window = window; - grab->eventMask = mask->core; /* same for XI */ - grab->deviceMask = 0; - grab->ownerEvents = param->ownerEvents; - grab->keyboardMode = param->this_device_mode; - grab->pointerMode = param->other_devices_mode; - grab->modifiersDetail.exact = param->modifiers; - grab->modifiersDetail.pMask = NULL; - grab->modifierDevice = modDevice; - grab->type = type; - grab->grabtype = grabtype; - grab->detail.exact = keybut; - grab->detail.pMask = NULL; - grab->confineTo = confineTo; - grab->cursor = cursor; - grab->next = NULL; - - if (grabtype == GRABTYPE_XI2) - memcpy(grab->xi2mask, mask->xi2mask, sizeof(mask->xi2mask)); - if (cursor) - cursor->refcnt++; - return grab; - -} - -static void -FreeGrab(GrabPtr pGrab) -{ - if (pGrab->modifiersDetail.pMask != NULL) - xfree(pGrab->modifiersDetail.pMask); - - if (pGrab->detail.pMask != NULL) - xfree(pGrab->detail.pMask); - - if (pGrab->cursor) - FreeCursor(pGrab->cursor, (Cursor)0); - - xfree(pGrab); -} - -int -DeletePassiveGrab(pointer value, XID id) -{ - GrabPtr g, prev; - GrabPtr pGrab = (GrabPtr)value; - - /* it is OK if the grab isn't found */ - prev = 0; - for (g = (wPassiveGrabs (pGrab->window)); g; g = g->next) - { - if (pGrab == g) - { - if (prev) - prev->next = g->next; - else - if (!(pGrab->window->optional->passiveGrabs = g->next)) - CheckWindowOptionalNeed (pGrab->window); - break; - } - prev = g; - } - FreeGrab(pGrab); - return Success; -} - -static Mask * -DeleteDetailFromMask(Mask *pDetailMask, unsigned int detail) -{ - Mask *mask; - int i; - - mask = xalloc(sizeof(Mask) * MasksPerDetailMask); - if (mask) - { - if (pDetailMask) - for (i = 0; i < MasksPerDetailMask; i++) - mask[i]= pDetailMask[i]; - else - for (i = 0; i < MasksPerDetailMask; i++) - mask[i]= ~0L; - BITCLEAR(mask, detail); - } - return mask; -} - -static Bool -IsInGrabMask( - DetailRec firstDetail, - DetailRec secondDetail, - unsigned int exception) -{ - if (firstDetail.exact == exception) - { - if (firstDetail.pMask == NULL) - return TRUE; - - /* (at present) never called with two non-null pMasks */ - if (secondDetail.exact == exception) - return FALSE; - - if (GETBIT(firstDetail.pMask, secondDetail.exact)) - return TRUE; - } - - return FALSE; -} - -static Bool -IdenticalExactDetails( - unsigned int firstExact, - unsigned int secondExact, - unsigned int exception) -{ - if ((firstExact == exception) || (secondExact == exception)) - return FALSE; - - if (firstExact == secondExact) - return TRUE; - - return FALSE; -} - -static Bool -DetailSupersedesSecond( - DetailRec firstDetail, - DetailRec secondDetail, - unsigned int exception) -{ - if (IsInGrabMask(firstDetail, secondDetail, exception)) - return TRUE; - - if (IdenticalExactDetails(firstDetail.exact, secondDetail.exact, - exception)) - return TRUE; - - return FALSE; -} - -static Bool -GrabSupersedesSecond(GrabPtr pFirstGrab, GrabPtr pSecondGrab) -{ - unsigned int any_modifier = (pFirstGrab->grabtype == GRABTYPE_XI2) ? - (unsigned int)XIAnyModifier : - (unsigned int)AnyModifier; - if (!DetailSupersedesSecond(pFirstGrab->modifiersDetail, - pSecondGrab->modifiersDetail, - any_modifier)) - return FALSE; - - if (DetailSupersedesSecond(pFirstGrab->detail, - pSecondGrab->detail, (unsigned int)AnyKey)) - return TRUE; - - return FALSE; -} - -/** - * Compares two grabs and returns TRUE if the first grab matches the second - * grab. - * - * A match is when - * - the devices set for the grab are equal (this is optional). - * - the event types for both grabs are equal. - * - XXX - * - * @param ignoreDevice TRUE if the device settings on the grabs are to be - * ignored. - * @return TRUE if the grabs match or FALSE otherwise. - */ -Bool -GrabMatchesSecond(GrabPtr pFirstGrab, GrabPtr pSecondGrab, Bool ignoreDevice) -{ - unsigned int any_modifier = (pFirstGrab->grabtype == GRABTYPE_XI2) ? - (unsigned int)XIAnyModifier : - (unsigned int)AnyModifier; - - if (pFirstGrab->grabtype != pSecondGrab->grabtype) - return FALSE; - - if (pFirstGrab->grabtype == GRABTYPE_XI2) - { - if (pFirstGrab->device == inputInfo.all_devices || - pSecondGrab->device == inputInfo.all_devices) - { - /* do nothing */ - } else if (pFirstGrab->device == inputInfo.all_master_devices) - { - if (pSecondGrab->device != inputInfo.all_master_devices && - !IsMaster(pSecondGrab->device)) - return FALSE; - } else if (pSecondGrab->device == inputInfo.all_master_devices) - { - if (pFirstGrab->device != inputInfo.all_master_devices && - !IsMaster(pFirstGrab->device)) - return FALSE; - } else if (pSecondGrab->device != pFirstGrab->device) - return FALSE; - } else if (!ignoreDevice && - ((pFirstGrab->device != pSecondGrab->device) || - (pFirstGrab->modifierDevice != pSecondGrab->modifierDevice))) - return FALSE; - - if (pFirstGrab->type != pSecondGrab->type) - return FALSE; - - if (GrabSupersedesSecond(pFirstGrab, pSecondGrab) || - GrabSupersedesSecond(pSecondGrab, pFirstGrab)) - return TRUE; - - if (DetailSupersedesSecond(pSecondGrab->detail, pFirstGrab->detail, - (unsigned int)AnyKey) - && - DetailSupersedesSecond(pFirstGrab->modifiersDetail, - pSecondGrab->modifiersDetail, - any_modifier)) - return TRUE; - - if (DetailSupersedesSecond(pFirstGrab->detail, pSecondGrab->detail, - (unsigned int)AnyKey) - && - DetailSupersedesSecond(pSecondGrab->modifiersDetail, - pFirstGrab->modifiersDetail, - any_modifier)) - return TRUE; - - return FALSE; -} - -static Bool -GrabsAreIdentical(GrabPtr pFirstGrab, GrabPtr pSecondGrab) -{ - unsigned int any_modifier = (pFirstGrab->grabtype == GRABTYPE_XI2) ? - (unsigned int)XIAnyModifier : - (unsigned int)AnyModifier; - - if (pFirstGrab->grabtype != pSecondGrab->grabtype) - return FALSE; - - if (pFirstGrab->device != pSecondGrab->device || - (pFirstGrab->modifierDevice != pSecondGrab->modifierDevice) || - (pFirstGrab->type != pSecondGrab->type)) - return FALSE; - - if (!(DetailSupersedesSecond(pFirstGrab->detail, - pSecondGrab->detail, - (unsigned int)AnyKey) && - DetailSupersedesSecond(pSecondGrab->detail, - pFirstGrab->detail, - (unsigned int)AnyKey))) - return FALSE; - - - if (!(DetailSupersedesSecond(pFirstGrab->modifiersDetail, - pSecondGrab->modifiersDetail, - any_modifier) && - DetailSupersedesSecond(pSecondGrab->modifiersDetail, - pFirstGrab->modifiersDetail, - any_modifier))) - return FALSE; - - return TRUE; -} - - -/** - * Prepend the new grab to the list of passive grabs on the window. - * Any previously existing grab that matches the new grab will be removed. - * Adding a new grab that would override another client's grab will result in - * a BadAccess. - * - * @return Success or X error code on failure. - */ -int -AddPassiveGrabToList(ClientPtr client, GrabPtr pGrab) -{ - GrabPtr grab; - Mask access_mode = DixGrabAccess; - int rc; - - for (grab = wPassiveGrabs(pGrab->window); grab; grab = grab->next) - { - if (GrabMatchesSecond(pGrab, grab, FALSE)) - { - if (CLIENT_BITS(pGrab->resource) != CLIENT_BITS(grab->resource)) - { - FreeGrab(pGrab); - return BadAccess; - } - } - } - - if (pGrab->keyboardMode == GrabModeSync||pGrab->pointerMode == GrabModeSync) - access_mode |= DixFreezeAccess; - rc = XaceHook(XACE_DEVICE_ACCESS, client, pGrab->device, access_mode); - if (rc != Success) - return rc; - - /* Remove all grabs that match the new one exactly */ - for (grab = wPassiveGrabs(pGrab->window); grab; grab = grab->next) - { - if (GrabsAreIdentical(pGrab, grab)) - { - DeletePassiveGrabFromList(grab); - break; - } - } - - if (!pGrab->window->optional && !MakeWindowOptional (pGrab->window)) - { - FreeGrab(pGrab); - return BadAlloc; - } - - pGrab->next = pGrab->window->optional->passiveGrabs; - pGrab->window->optional->passiveGrabs = pGrab; - if (AddResource(pGrab->resource, RT_PASSIVEGRAB, (pointer)pGrab)) - return Success; - return BadAlloc; -} - -/* the following is kinda complicated, because we need to be able to back out - * if any allocation fails - */ - -Bool -DeletePassiveGrabFromList(GrabPtr pMinuendGrab) -{ - GrabPtr grab; - GrabPtr *deletes, *adds; - Mask ***updates, **details; - int i, ndels, nadds, nups; - Bool ok; - unsigned int any_modifier; - unsigned int any_key; - -#define UPDATE(mask,exact) \ - if (!(details[nups] = DeleteDetailFromMask(mask, exact))) \ - ok = FALSE; \ - else \ - updates[nups++] = &(mask) - - i = 0; - for (grab = wPassiveGrabs(pMinuendGrab->window); grab; grab = grab->next) - i++; - if (!i) - return TRUE; - deletes = xalloc(i * sizeof(GrabPtr)); - adds = xalloc(i * sizeof(GrabPtr)); - updates = xalloc(i * sizeof(Mask **)); - details = xalloc(i * sizeof(Mask *)); - if (!deletes || !adds || !updates || !details) - { - if (details) xfree(details); - if (updates) xfree(updates); - if (adds) xfree(adds); - if (deletes) xfree(deletes); - return FALSE; - } - - any_modifier = (pMinuendGrab->grabtype == GRABTYPE_XI2) ? - (unsigned int)XIAnyModifier : (unsigned int)AnyModifier; - any_key = (pMinuendGrab->grabtype == GRABTYPE_XI2) ? - (unsigned int)XIAnyKeycode : (unsigned int)AnyKey; - ndels = nadds = nups = 0; - ok = TRUE; - for (grab = wPassiveGrabs(pMinuendGrab->window); - grab && ok; - grab = grab->next) - { - if ((CLIENT_BITS(grab->resource) != CLIENT_BITS(pMinuendGrab->resource)) || - !GrabMatchesSecond(grab, pMinuendGrab, - (grab->grabtype == GRABTYPE_CORE))) - continue; - if (GrabSupersedesSecond(pMinuendGrab, grab)) - { - deletes[ndels++] = grab; - } - else if ((grab->detail.exact == any_key) - && (grab->modifiersDetail.exact != any_modifier)) - { - UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact); - } - else if ((grab->modifiersDetail.exact == any_modifier) - && (grab->detail.exact != any_key)) - { - UPDATE(grab->modifiersDetail.pMask, - pMinuendGrab->modifiersDetail.exact); - } - else if ((pMinuendGrab->detail.exact != any_key) - && (pMinuendGrab->modifiersDetail.exact != any_modifier)) - { - GrabPtr pNewGrab; - GrabParameters param; - - UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact); - - memset(¶m, 0, sizeof(param)); - param.ownerEvents = grab->ownerEvents; - param.this_device_mode = grab->keyboardMode; - param.other_devices_mode = grab->pointerMode; - param.modifiers = any_modifier; - - pNewGrab = CreateGrab(CLIENT_ID(grab->resource), grab->device, - grab->modifierDevice, grab->window, - grab->grabtype, - (GrabMask*)&grab->eventMask, - ¶m, (int)grab->type, - pMinuendGrab->detail.exact, - grab->confineTo, grab->cursor); - if (!pNewGrab) - ok = FALSE; - else if (!(pNewGrab->modifiersDetail.pMask = - DeleteDetailFromMask(grab->modifiersDetail.pMask, - pMinuendGrab->modifiersDetail.exact)) - || - (!pNewGrab->window->optional && - !MakeWindowOptional(pNewGrab->window))) - { - FreeGrab(pNewGrab); - ok = FALSE; - } - else if (!AddResource(pNewGrab->resource, RT_PASSIVEGRAB, - (pointer)pNewGrab)) - ok = FALSE; - else - adds[nadds++] = pNewGrab; - } - else if (pMinuendGrab->detail.exact == any_key) - { - UPDATE(grab->modifiersDetail.pMask, - pMinuendGrab->modifiersDetail.exact); - } - else - { - UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact); - } - } - - if (!ok) - { - for (i = 0; i < nadds; i++) - FreeResource(adds[i]->resource, RT_NONE); - for (i = 0; i < nups; i++) - xfree(details[i]); - } - else - { - for (i = 0; i < ndels; i++) - FreeResource(deletes[i]->resource, RT_NONE); - for (i = 0; i < nadds; i++) - { - grab = adds[i]; - grab->next = grab->window->optional->passiveGrabs; - grab->window->optional->passiveGrabs = grab; - } - for (i = 0; i < nups; i++) - { - xfree(*updates[i]); - *updates[i] = details[i]; - } - } - xfree(details); - xfree(updates); - xfree(adds); - xfree(deletes); - return ok; - -#undef UPDATE -} +/*
+
+Copyright 1987, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall
+not be used in advertising or otherwise to promote the sale, use or
+other dealings in this Software without prior written authorization
+from The Open Group.
+
+
+Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts,
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the name of Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN action OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+*/
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <X11/X.h>
+#include "misc.h"
+#include <X11/Xproto.h>
+#include <X11/extensions/XI2.h>
+#include "windowstr.h"
+#include "inputstr.h"
+#include "cursorstr.h"
+#include "dixgrabs.h"
+#include "xace.h"
+#include "exevents.h"
+
+#define BITMASK(i) (((Mask)1) << ((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))
+
+GrabPtr
+CreateGrab(
+ int client,
+ DeviceIntPtr device,
+ DeviceIntPtr modDevice,
+ WindowPtr window,
+ GrabType grabtype,
+ GrabMask *mask,
+ GrabParameters *param,
+ int type,
+ KeyCode keybut, /* key or button */
+ WindowPtr confineTo,
+ CursorPtr cursor)
+{
+ GrabPtr grab;
+
+ grab = calloc(1, sizeof(GrabRec));
+ if (!grab)
+ return (GrabPtr)NULL;
+ grab->resource = FakeClientID(client);
+ grab->device = device;
+ grab->window = window;
+ grab->eventMask = mask->core; /* same for XI */
+ grab->deviceMask = 0;
+ grab->ownerEvents = param->ownerEvents;
+ grab->keyboardMode = param->this_device_mode;
+ grab->pointerMode = param->other_devices_mode;
+ grab->modifiersDetail.exact = param->modifiers;
+ grab->modifiersDetail.pMask = NULL;
+ grab->modifierDevice = modDevice;
+ grab->type = type;
+ grab->grabtype = grabtype;
+ grab->detail.exact = keybut;
+ grab->detail.pMask = NULL;
+ grab->confineTo = confineTo;
+ grab->cursor = cursor;
+ grab->next = NULL;
+
+ if (grabtype == GRABTYPE_XI2)
+ memcpy(grab->xi2mask, mask->xi2mask, sizeof(mask->xi2mask));
+ if (cursor)
+ cursor->refcnt++;
+ return grab;
+
+}
+
+static void
+FreeGrab(GrabPtr pGrab)
+{
+ if (pGrab->modifiersDetail.pMask != NULL)
+ free(pGrab->modifiersDetail.pMask);
+
+ if (pGrab->detail.pMask != NULL)
+ free(pGrab->detail.pMask);
+
+ if (pGrab->cursor)
+ FreeCursor(pGrab->cursor, (Cursor)0);
+
+ free(pGrab);
+}
+
+int
+DeletePassiveGrab(pointer value, XID id)
+{
+ GrabPtr g, prev;
+ GrabPtr pGrab = (GrabPtr)value;
+
+ /* it is OK if the grab isn't found */
+ prev = 0;
+ for (g = (wPassiveGrabs (pGrab->window)); g; g = g->next)
+ {
+ if (pGrab == g)
+ {
+ if (prev)
+ prev->next = g->next;
+ else
+ if (!(pGrab->window->optional->passiveGrabs = g->next))
+ CheckWindowOptionalNeed (pGrab->window);
+ break;
+ }
+ prev = g;
+ }
+ FreeGrab(pGrab);
+ return Success;
+}
+
+static Mask *
+DeleteDetailFromMask(Mask *pDetailMask, unsigned int detail)
+{
+ Mask *mask;
+ int i;
+
+ mask = malloc(sizeof(Mask) * MasksPerDetailMask);
+ if (mask)
+ {
+ if (pDetailMask)
+ for (i = 0; i < MasksPerDetailMask; i++)
+ mask[i]= pDetailMask[i];
+ else
+ for (i = 0; i < MasksPerDetailMask; i++)
+ mask[i]= ~0L;
+ BITCLEAR(mask, detail);
+ }
+ return mask;
+}
+
+static Bool
+IsInGrabMask(
+ DetailRec firstDetail,
+ DetailRec secondDetail,
+ unsigned int exception)
+{
+ if (firstDetail.exact == exception)
+ {
+ if (firstDetail.pMask == NULL)
+ return TRUE;
+
+ /* (at present) never called with two non-null pMasks */
+ if (secondDetail.exact == exception)
+ return FALSE;
+
+ if (GETBIT(firstDetail.pMask, secondDetail.exact))
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+static Bool
+IdenticalExactDetails(
+ unsigned int firstExact,
+ unsigned int secondExact,
+ unsigned int exception)
+{
+ if ((firstExact == exception) || (secondExact == exception))
+ return FALSE;
+
+ if (firstExact == secondExact)
+ return TRUE;
+
+ return FALSE;
+}
+
+static Bool
+DetailSupersedesSecond(
+ DetailRec firstDetail,
+ DetailRec secondDetail,
+ unsigned int exception)
+{
+ if (IsInGrabMask(firstDetail, secondDetail, exception))
+ return TRUE;
+
+ if (IdenticalExactDetails(firstDetail.exact, secondDetail.exact,
+ exception))
+ return TRUE;
+
+ return FALSE;
+}
+
+static Bool
+GrabSupersedesSecond(GrabPtr pFirstGrab, GrabPtr pSecondGrab)
+{
+ unsigned int any_modifier = (pFirstGrab->grabtype == GRABTYPE_XI2) ?
+ (unsigned int)XIAnyModifier :
+ (unsigned int)AnyModifier;
+ if (!DetailSupersedesSecond(pFirstGrab->modifiersDetail,
+ pSecondGrab->modifiersDetail,
+ any_modifier))
+ return FALSE;
+
+ if (DetailSupersedesSecond(pFirstGrab->detail,
+ pSecondGrab->detail, (unsigned int)AnyKey))
+ return TRUE;
+
+ return FALSE;
+}
+
+/**
+ * Compares two grabs and returns TRUE if the first grab matches the second
+ * grab.
+ *
+ * A match is when
+ * - the devices set for the grab are equal (this is optional).
+ * - the event types for both grabs are equal.
+ * - XXX
+ *
+ * @param ignoreDevice TRUE if the device settings on the grabs are to be
+ * ignored.
+ * @return TRUE if the grabs match or FALSE otherwise.
+ */
+Bool
+GrabMatchesSecond(GrabPtr pFirstGrab, GrabPtr pSecondGrab, Bool ignoreDevice)
+{
+ unsigned int any_modifier = (pFirstGrab->grabtype == GRABTYPE_XI2) ?
+ (unsigned int)XIAnyModifier :
+ (unsigned int)AnyModifier;
+
+ if (pFirstGrab->grabtype != pSecondGrab->grabtype)
+ return FALSE;
+
+ if (pFirstGrab->grabtype == GRABTYPE_XI2)
+ {
+ if (pFirstGrab->device == inputInfo.all_devices ||
+ pSecondGrab->device == inputInfo.all_devices)
+ {
+ /* do nothing */
+ } else if (pFirstGrab->device == inputInfo.all_master_devices)
+ {
+ if (pSecondGrab->device != inputInfo.all_master_devices &&
+ !IsMaster(pSecondGrab->device))
+ return FALSE;
+ } else if (pSecondGrab->device == inputInfo.all_master_devices)
+ {
+ if (pFirstGrab->device != inputInfo.all_master_devices &&
+ !IsMaster(pFirstGrab->device))
+ return FALSE;
+ } else if (pSecondGrab->device != pFirstGrab->device)
+ return FALSE;
+ } else if (!ignoreDevice &&
+ ((pFirstGrab->device != pSecondGrab->device) ||
+ (pFirstGrab->modifierDevice != pSecondGrab->modifierDevice)))
+ return FALSE;
+
+ if (pFirstGrab->type != pSecondGrab->type)
+ return FALSE;
+
+ if (GrabSupersedesSecond(pFirstGrab, pSecondGrab) ||
+ GrabSupersedesSecond(pSecondGrab, pFirstGrab))
+ return TRUE;
+
+ if (DetailSupersedesSecond(pSecondGrab->detail, pFirstGrab->detail,
+ (unsigned int)AnyKey)
+ &&
+ DetailSupersedesSecond(pFirstGrab->modifiersDetail,
+ pSecondGrab->modifiersDetail,
+ any_modifier))
+ return TRUE;
+
+ if (DetailSupersedesSecond(pFirstGrab->detail, pSecondGrab->detail,
+ (unsigned int)AnyKey)
+ &&
+ DetailSupersedesSecond(pSecondGrab->modifiersDetail,
+ pFirstGrab->modifiersDetail,
+ any_modifier))
+ return TRUE;
+
+ return FALSE;
+}
+
+static Bool
+GrabsAreIdentical(GrabPtr pFirstGrab, GrabPtr pSecondGrab)
+{
+ unsigned int any_modifier = (pFirstGrab->grabtype == GRABTYPE_XI2) ?
+ (unsigned int)XIAnyModifier :
+ (unsigned int)AnyModifier;
+
+ if (pFirstGrab->grabtype != pSecondGrab->grabtype)
+ return FALSE;
+
+ if (pFirstGrab->device != pSecondGrab->device ||
+ (pFirstGrab->modifierDevice != pSecondGrab->modifierDevice) ||
+ (pFirstGrab->type != pSecondGrab->type))
+ return FALSE;
+
+ if (!(DetailSupersedesSecond(pFirstGrab->detail,
+ pSecondGrab->detail,
+ (unsigned int)AnyKey) &&
+ DetailSupersedesSecond(pSecondGrab->detail,
+ pFirstGrab->detail,
+ (unsigned int)AnyKey)))
+ return FALSE;
+
+
+ if (!(DetailSupersedesSecond(pFirstGrab->modifiersDetail,
+ pSecondGrab->modifiersDetail,
+ any_modifier) &&
+ DetailSupersedesSecond(pSecondGrab->modifiersDetail,
+ pFirstGrab->modifiersDetail,
+ any_modifier)))
+ return FALSE;
+
+ return TRUE;
+}
+
+
+/**
+ * Prepend the new grab to the list of passive grabs on the window.
+ * Any previously existing grab that matches the new grab will be removed.
+ * Adding a new grab that would override another client's grab will result in
+ * a BadAccess.
+ *
+ * @return Success or X error code on failure.
+ */
+int
+AddPassiveGrabToList(ClientPtr client, GrabPtr pGrab)
+{
+ GrabPtr grab;
+ Mask access_mode = DixGrabAccess;
+ int rc;
+
+ for (grab = wPassiveGrabs(pGrab->window); grab; grab = grab->next)
+ {
+ if (GrabMatchesSecond(pGrab, grab, FALSE))
+ {
+ if (CLIENT_BITS(pGrab->resource) != CLIENT_BITS(grab->resource))
+ {
+ FreeGrab(pGrab);
+ return BadAccess;
+ }
+ }
+ }
+
+ if (pGrab->keyboardMode == GrabModeSync||pGrab->pointerMode == GrabModeSync)
+ access_mode |= DixFreezeAccess;
+ rc = XaceHook(XACE_DEVICE_ACCESS, client, pGrab->device, access_mode);
+ if (rc != Success)
+ return rc;
+
+ /* Remove all grabs that match the new one exactly */
+ for (grab = wPassiveGrabs(pGrab->window); grab; grab = grab->next)
+ {
+ if (GrabsAreIdentical(pGrab, grab))
+ {
+ DeletePassiveGrabFromList(grab);
+ break;
+ }
+ }
+
+ if (!pGrab->window->optional && !MakeWindowOptional (pGrab->window))
+ {
+ FreeGrab(pGrab);
+ return BadAlloc;
+ }
+
+ pGrab->next = pGrab->window->optional->passiveGrabs;
+ pGrab->window->optional->passiveGrabs = pGrab;
+ if (AddResource(pGrab->resource, RT_PASSIVEGRAB, (pointer)pGrab))
+ return Success;
+ return BadAlloc;
+}
+
+/* the following is kinda complicated, because we need to be able to back out
+ * if any allocation fails
+ */
+
+Bool
+DeletePassiveGrabFromList(GrabPtr pMinuendGrab)
+{
+ GrabPtr grab;
+ GrabPtr *deletes, *adds;
+ Mask ***updates, **details;
+ int i, ndels, nadds, nups;
+ Bool ok;
+ unsigned int any_modifier;
+ unsigned int any_key;
+
+#define UPDATE(mask,exact) \
+ if (!(details[nups] = DeleteDetailFromMask(mask, exact))) \
+ ok = FALSE; \
+ else \
+ updates[nups++] = &(mask)
+
+ i = 0;
+ for (grab = wPassiveGrabs(pMinuendGrab->window); grab; grab = grab->next)
+ i++;
+ if (!i)
+ return TRUE;
+ deletes = malloc(i * sizeof(GrabPtr));
+ adds = malloc(i * sizeof(GrabPtr));
+ updates = malloc(i * sizeof(Mask **));
+ details = malloc(i * sizeof(Mask *));
+ if (!deletes || !adds || !updates || !details)
+ {
+ if (details) free(details);
+ if (updates) free(updates);
+ if (adds) free(adds);
+ if (deletes) free(deletes);
+ return FALSE;
+ }
+
+ any_modifier = (pMinuendGrab->grabtype == GRABTYPE_XI2) ?
+ (unsigned int)XIAnyModifier : (unsigned int)AnyModifier;
+ any_key = (pMinuendGrab->grabtype == GRABTYPE_XI2) ?
+ (unsigned int)XIAnyKeycode : (unsigned int)AnyKey;
+ ndels = nadds = nups = 0;
+ ok = TRUE;
+ for (grab = wPassiveGrabs(pMinuendGrab->window);
+ grab && ok;
+ grab = grab->next)
+ {
+ if ((CLIENT_BITS(grab->resource) != CLIENT_BITS(pMinuendGrab->resource)) ||
+ !GrabMatchesSecond(grab, pMinuendGrab,
+ (grab->grabtype == GRABTYPE_CORE)))
+ continue;
+ if (GrabSupersedesSecond(pMinuendGrab, grab))
+ {
+ deletes[ndels++] = grab;
+ }
+ else if ((grab->detail.exact == any_key)
+ && (grab->modifiersDetail.exact != any_modifier))
+ {
+ UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact);
+ }
+ else if ((grab->modifiersDetail.exact == any_modifier)
+ && (grab->detail.exact != any_key))
+ {
+ UPDATE(grab->modifiersDetail.pMask,
+ pMinuendGrab->modifiersDetail.exact);
+ }
+ else if ((pMinuendGrab->detail.exact != any_key)
+ && (pMinuendGrab->modifiersDetail.exact != any_modifier))
+ {
+ GrabPtr pNewGrab;
+ GrabParameters param;
+
+ UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact);
+
+ memset(¶m, 0, sizeof(param));
+ param.ownerEvents = grab->ownerEvents;
+ param.this_device_mode = grab->keyboardMode;
+ param.other_devices_mode = grab->pointerMode;
+ param.modifiers = any_modifier;
+
+ pNewGrab = CreateGrab(CLIENT_ID(grab->resource), grab->device,
+ grab->modifierDevice, grab->window,
+ grab->grabtype,
+ (GrabMask*)&grab->eventMask,
+ ¶m, (int)grab->type,
+ pMinuendGrab->detail.exact,
+ grab->confineTo, grab->cursor);
+ if (!pNewGrab)
+ ok = FALSE;
+ else if (!(pNewGrab->modifiersDetail.pMask =
+ DeleteDetailFromMask(grab->modifiersDetail.pMask,
+ pMinuendGrab->modifiersDetail.exact))
+ ||
+ (!pNewGrab->window->optional &&
+ !MakeWindowOptional(pNewGrab->window)))
+ {
+ FreeGrab(pNewGrab);
+ ok = FALSE;
+ }
+ else if (!AddResource(pNewGrab->resource, RT_PASSIVEGRAB,
+ (pointer)pNewGrab))
+ ok = FALSE;
+ else
+ adds[nadds++] = pNewGrab;
+ }
+ else if (pMinuendGrab->detail.exact == any_key)
+ {
+ UPDATE(grab->modifiersDetail.pMask,
+ pMinuendGrab->modifiersDetail.exact);
+ }
+ else
+ {
+ UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact);
+ }
+ }
+
+ if (!ok)
+ {
+ for (i = 0; i < nadds; i++)
+ FreeResource(adds[i]->resource, RT_NONE);
+ for (i = 0; i < nups; i++)
+ free(details[i]);
+ }
+ else
+ {
+ for (i = 0; i < ndels; i++)
+ FreeResource(deletes[i]->resource, RT_NONE);
+ for (i = 0; i < nadds; i++)
+ {
+ grab = adds[i];
+ grab->next = grab->window->optional->passiveGrabs;
+ grab->window->optional->passiveGrabs = grab;
+ }
+ for (i = 0; i < nups; i++)
+ {
+ free(*updates[i]);
+ *updates[i] = details[i];
+ }
+ }
+ free(details);
+ free(updates);
+ free(adds);
+ free(deletes);
+ return ok;
+
+#undef UPDATE
+}
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