diff options
Diffstat (limited to 'xorg-server/dix/grabs.c')
| -rw-r--r-- | xorg-server/dix/grabs.c | 492 |
1 files changed, 492 insertions, 0 deletions
diff --git a/xorg-server/dix/grabs.c b/xorg-server/dix/grabs.c new file mode 100644 index 000000000..85e101c6a --- /dev/null +++ b/xorg-server/dix/grabs.c @@ -0,0 +1,492 @@ +/* + +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" +#define NEED_EVENTS +#include <X11/Xproto.h> +#include "windowstr.h" +#include "inputstr.h" +#include "cursorstr.h" +#include "dixgrabs.h" +#include "xace.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, + WindowPtr window, + Mask eventMask, + Bool ownerEvents, Bool keyboardMode, Bool pointerMode, + DeviceIntPtr modDevice, + unsigned short modifiers, + int type, + KeyCode keybut, /* key or button */ + WindowPtr confineTo, + CursorPtr cursor) +{ + GrabPtr grab; + + grab = (GrabPtr)xalloc(sizeof(GrabRec)); + if (!grab) + return (GrabPtr)NULL; + grab->resource = FakeClientID(client); + grab->device = device; + grab->coreGrab = ((device == inputInfo.keyboard) || + (device == inputInfo.pointer)); + grab->window = window; + grab->eventMask = eventMask; + grab->ownerEvents = ownerEvents; + grab->keyboardMode = keyboardMode; + grab->pointerMode = pointerMode; + grab->modifiersDetail.exact = modifiers; + grab->modifiersDetail.pMask = NULL; + grab->modifierDevice = modDevice; + grab->coreMods = ((modDevice == inputInfo.keyboard) || + (modDevice == inputInfo.pointer)); + grab->type = type; + grab->detail.exact = keybut; + grab->detail.pMask = NULL; + grab->confineTo = confineTo; + grab->cursor = cursor; + 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 short detail) +{ + Mask *mask; + int i; + + mask = (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 short 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 short firstExact, + unsigned short secondExact, + unsigned short exception) +{ + if ((firstExact == exception) || (secondExact == exception)) + return FALSE; + + if (firstExact == secondExact) + return TRUE; + + return FALSE; +} + +static Bool +DetailSupersedesSecond( + DetailRec firstDetail, + DetailRec secondDetail, + unsigned short 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) +{ + if (!DetailSupersedesSecond(pFirstGrab->modifiersDetail, + pSecondGrab->modifiersDetail, + (unsigned short)AnyModifier)) + return FALSE; + + if (DetailSupersedesSecond(pFirstGrab->detail, + pSecondGrab->detail, (unsigned short)AnyKey)) + return TRUE; + + return FALSE; +} + +Bool +GrabMatchesSecond(GrabPtr pFirstGrab, GrabPtr pSecondGrab) +{ + if ((pFirstGrab->device != pSecondGrab->device) || + (pFirstGrab->modifierDevice != pSecondGrab->modifierDevice) || + (pFirstGrab->type != pSecondGrab->type)) + return FALSE; + + if (GrabSupersedesSecond(pFirstGrab, pSecondGrab) || + GrabSupersedesSecond(pSecondGrab, pFirstGrab)) + return TRUE; + + if (DetailSupersedesSecond(pSecondGrab->detail, pFirstGrab->detail, + (unsigned short)AnyKey) + && + DetailSupersedesSecond(pFirstGrab->modifiersDetail, + pSecondGrab->modifiersDetail, + (unsigned short)AnyModifier)) + return TRUE; + + if (DetailSupersedesSecond(pFirstGrab->detail, pSecondGrab->detail, + (unsigned short)AnyKey) + && + DetailSupersedesSecond(pSecondGrab->modifiersDetail, + pFirstGrab->modifiersDetail, + (unsigned short)AnyModifier)) + return TRUE; + + return FALSE; +} + +static Bool +GrabsAreIdentical(GrabPtr pFirstGrab, GrabPtr pSecondGrab) +{ + if (pFirstGrab->device != pSecondGrab->device || + (pFirstGrab->modifierDevice != pSecondGrab->modifierDevice) || + (pFirstGrab->type != pSecondGrab->type)) + return FALSE; + + if (!(DetailSupersedesSecond(pFirstGrab->detail, + pSecondGrab->detail, + (unsigned short)AnyKey) && + DetailSupersedesSecond(pSecondGrab->detail, + pFirstGrab->detail, + (unsigned short)AnyKey))) + return FALSE; + + if (!(DetailSupersedesSecond(pFirstGrab->modifiersDetail, + pSecondGrab->modifiersDetail, + (unsigned short)AnyModifier) && + DetailSupersedesSecond(pSecondGrab->modifiersDetail, + pFirstGrab->modifiersDetail, + (unsigned short)AnyModifier))) + 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)) + { + 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; + +#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 = (GrabPtr *)xalloc(i * sizeof(GrabPtr)); + adds = (GrabPtr *)xalloc(i * sizeof(GrabPtr)); + updates = (Mask ***)xalloc(i * sizeof(Mask **)); + details = (Mask **)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; + } + 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)) + continue; + if (GrabSupersedesSecond(pMinuendGrab, grab)) + { + deletes[ndels++] = grab; + } + else if ((grab->detail.exact == AnyKey) + && (grab->modifiersDetail.exact != AnyModifier)) + { + UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact); + } + else if ((grab->modifiersDetail.exact == AnyModifier) + && (grab->detail.exact != AnyKey)) + { + UPDATE(grab->modifiersDetail.pMask, + pMinuendGrab->modifiersDetail.exact); + } + else if ((pMinuendGrab->detail.exact != AnyKey) + && (pMinuendGrab->modifiersDetail.exact != AnyModifier)) + { + GrabPtr pNewGrab; + + UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact); + + pNewGrab = CreateGrab(CLIENT_ID(grab->resource), grab->device, + grab->window, (Mask)grab->eventMask, + (Bool)grab->ownerEvents, + (Bool)grab->keyboardMode, + (Bool)grab->pointerMode, + grab->modifierDevice, + AnyModifier, (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 == AnyKey) + { + 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 +} |