xserver/Xi/closedev.c

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

Copyright 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
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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 1989 by Hewlett-Packard Company, Palo Alto, California.

			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 Hewlett-Packard not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.

HEWLETT-PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
HEWLETT-PACKARD 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.

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

/***********************************************************************
 *
 * Extension function to close an extension input device.
 *
 */

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

#include "inputstr.h"	/* DeviceIntPtr      */
#include "windowstr.h"	/* window structure  */
#include "scrnintstr.h"	/* screen structure  */
#include <X11/extensions/XI.h>
#include <X11/extensions/XIproto.h>
#include "XIstubs.h"
#include "exglobals.h"

#include "closedev.h"

/***********************************************************************
 *
 * This procedure closes an input device.
 *
 */

int
SProcXCloseDevice(ClientPtr client)
{
    char n;

    REQUEST(xCloseDeviceReq);
    swaps(&stuff->length, n);
    REQUEST_SIZE_MATCH(xCloseDeviceReq);
    return (ProcXCloseDevice(client));
}

/***********************************************************************
 *
 * Clear out event selections and passive grabs from a window for the
 * specified device.
 *
 */

static void
DeleteDeviceEvents(DeviceIntPtr dev, WindowPtr pWin, ClientPtr client)
{
    InputClientsPtr others;
    OtherInputMasks *pOthers;
    GrabPtr grab, next;

    if ((pOthers = wOtherInputMasks(pWin)) != 0)
	for (others = pOthers->inputClients; others; others = others->next)
	    if (SameClient(others, client))
		others->mask[dev->id] = NoEventMask;

    for (grab = wPassiveGrabs(pWin); grab; grab = next) {
	next = grab->next;
	if ((grab->device == dev) &&
	    (client->clientAsMask == CLIENT_BITS(grab->resource)))
	    FreeResource(grab->resource, RT_NONE);
    }
}

/***********************************************************************
 *
 * Walk througth the window tree, deleting event selections for this client
 * from this device from all windows.
 *
 */

static void
DeleteEventsFromChildren(DeviceIntPtr dev, WindowPtr p1, ClientPtr client)
{
    WindowPtr p2;

    while (p1) {
	p2 = p1->firstChild;
	DeleteDeviceEvents(dev, p1, client);
	DeleteEventsFromChildren(dev, p2, client);
	p1 = p1->nextSib;
    }
}

/***********************************************************************
 *
 * This procedure closes an input device.
 *
 */

int
ProcXCloseDevice(ClientPtr client)
{
    int rc, i;
    WindowPtr pWin, p1;
    DeviceIntPtr d;

    REQUEST(xCloseDeviceReq);
    REQUEST_SIZE_MATCH(xCloseDeviceReq);

    rc = dixLookupDevice(&d, stuff->deviceid, client, DixUseAccess);
    if (rc != Success)
	return rc;

    if (d->deviceGrab.grab && SameClient(d->deviceGrab.grab, client))
	(*d->deviceGrab.DeactivateGrab) (d);	/* release active grab */

    /* Remove event selections from all windows for events from this device
     * and selected by this client.
     * Delete passive grabs from all windows for this device.      */

    for (i = 0; i < screenInfo.numScreens; i++) {
	pWin = screenInfo.screens[i]->root;
	DeleteDeviceEvents(d, pWin, client);
	p1 = pWin->firstChild;
	DeleteEventsFromChildren(d, p1, client);
    }

    return Success;
}