xserver/Xi/selectev.c

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

Copyright 1989, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
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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.

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

/***********************************************************************
 *
 * Request to select input from an extension device.
 *
 */

#include <dix-config.h>

#include <X11/extensions/XI.h>
#include <X11/extensions/XI2.h>
#include <X11/extensions/XIproto.h>

#include "dix/dix_priv.h"
#include "dix/exevents_priv.h"
#include "dix/request_priv.h"
#include "Xi/handlers.h"

#include "inputstr.h"           /* DeviceIntPtr      */
#include "windowstr.h"          /* window structure  */
#include "exglobals.h"
#include "grabdev.h"

static int
HandleDevicePresenceMask(ClientPtr client, WindowPtr win,
                         XEventClass * cls, CARD16 *count)
{
    int i, j;
    Mask mask;

    /* We use the device ID 256 to select events that aren't bound to
     * any device.  For now we only handle the device presence event,
     * but this could be extended to other events that aren't bound to
     * a device.
     *
     * In order not to break in CreateMaskFromList() we remove the
     * entries with device ID 256 from the XEventClass array.
     */

    mask = 0;
    for (i = 0, j = 0; i < *count; i++) {
        if (cls[i] >> 8 != 256) {
            cls[j] = cls[i];
            j++;
            continue;
        }

        switch (cls[i] & 0xff) {
        case _devicePresence:
            mask |= DevicePresenceNotifyMask;
            break;
        }
    }

    *count = j;

    if (mask == 0)
        return Success;

    /* We always only use mksidx = AllDevices for events not bound to
     * devices */
    if (AddExtensionClient(win, client, mask, XIAllDevices) != Success)
        return BadAlloc;

    RecalculateDeviceDeliverableEvents(win);

    return Success;
}

/***********************************************************************
 *
 * This procedure selects input from an extension device.
 *
 */

int
ProcXSelectExtensionEvent(ClientPtr client)
{
    X_REQUEST_HEAD_AT_LEAST(xSelectExtensionEventReq);
    X_REQUEST_FIELD_CARD32(window);
    X_REQUEST_FIELD_CARD16(count);
    X_REQUEST_REST_COUNT_CARD32(stuff->count);

    int ret;
    int i;
    WindowPtr pWin;
    struct tmask tmp[EMASKSIZE];

    ret = dixLookupWindow(&pWin, stuff->window, client, DixReceiveAccess);
    if (ret != Success)
        return ret;

    if (HandleDevicePresenceMask(client, pWin, (XEventClass *) &stuff[1],
                                 &stuff->count) != Success)
        return BadAlloc;

    if ((ret = CreateMaskFromList(client, (XEventClass *) &stuff[1],
                                  stuff->count, tmp, NULL,
                                  X_SelectExtensionEvent)) != Success)
        return ret;

    for (i = 0; i < EMASKSIZE; i++)
        if (tmp[i].dev != NULL) {
            if (tmp[i].mask & ~XIAllMasks) {
                client->errorValue = tmp[i].mask;
                return BadValue;
            }
            if ((ret =
                 SelectForWindow((DeviceIntPtr) tmp[i].dev, pWin, client,
                                 tmp[i].mask, DeviceButtonGrabMask)) != Success)
                return ret;
        }

    return Success;
}