XIGrabDevice.c revision 44584a44 
1/*
2 * Copyright © 2009 Red Hat, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 */
24
25#if HAVE_CONFIG_H
26#include <config.h>
27#endif
28
29#include <stdint.h>
30#include <X11/Xlibint.h>
31#include <X11/extensions/XI2proto.h>
32#include <X11/extensions/XInput2.h>
33#include <X11/extensions/extutil.h>
34#include <limits.h>
35#include "XIint.h"
36
37
38Status
39XIGrabDevice(Display* dpy, int deviceid, Window grab_window, Time time,
40             Cursor cursor, int grab_mode, int paired_device_mode,
41             Bool owner_events, XIEventMask *mask)
42{
43    xXIGrabDeviceReq *req;
44    xXIGrabDeviceReply reply;
45    char* buff;
46    int len;
47
48    XExtDisplayInfo *extinfo = XInput_find_display(dpy);
49
50    LockDisplay(dpy);
51    if (_XiCheckExtInit(dpy, XInput_2_0, extinfo) == -1)
52	return (NoSuchExtension);
53
54    if (mask->mask_len > INT_MAX - 3 ||
55        (mask->mask_len + 3)/4 >= 0xffff)
56    {
57        reply.status = BadValue;
58        goto out;
59    }
60
61    /* mask->mask_len is in bytes, but we need 4-byte units on the wire,
62     * and they need to be padded with 0 */
63    len = (mask->mask_len + 3)/4;
64    buff = calloc(4, len);
65    if (!buff)
66    {
67        reply.status =  BadAlloc;
68        goto out;
69    }
70
71    GetReq(XIGrabDevice, req);
72    req->reqType  = extinfo->codes->major_opcode;
73    req->ReqType  = X_XIGrabDevice;
74    req->deviceid = deviceid;
75    req->grab_window = grab_window;
76    req->time = time;
77    req->grab_mode = grab_mode;
78    req->paired_device_mode = paired_device_mode;
79    req->owner_events = owner_events;
80    req->mask_len = len;
81    req->cursor = cursor;
82
83    memcpy(buff, mask->mask, mask->mask_len);
84
85    SetReqLen(req, len, len);
86    Data(dpy, buff, len * 4);
87    free(buff);
88
89    if (_XReply(dpy, (xReply *)&reply, 0, xTrue) == 0)
90	reply.status = GrabSuccess;
91
92out:
93    UnlockDisplay(dpy);
94    SyncHandle();
95
96    return reply.status;
97}
98
99Status
100XIUngrabDevice(Display* dpy, int deviceid, Time time)
101{
102    xXIUngrabDeviceReq *req;
103
104    XExtDisplayInfo *info = XInput_find_display(dpy);
105
106    LockDisplay(dpy);
107    if (_XiCheckExtInit(dpy, XInput_2_0, info) == -1)
108	return (NoSuchExtension);
109
110    GetReq(XIUngrabDevice, req);
111    req->reqType = info->codes->major_opcode;
112    req->ReqType = X_XIUngrabDevice;
113
114    req->deviceid = deviceid;
115    req->time = time;
116
117    UnlockDisplay(dpy);
118    SyncHandle();
119    return (Success);
120}
121
122
123