grabdev.c revision 1b5d61b8 
1/************************************************************
2
3Copyright 1989, 1998  The Open Group
4
5Permission to use, copy, modify, distribute, and sell this software and its
6documentation for any purpose is hereby granted without fee, provided that
7the above copyright notice appear in all copies and that both that
8copyright notice and this permission notice appear in supporting
9documentation.
10
11The above copyright notice and this permission notice shall be included in
12all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
17OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20
21Except as contained in this notice, the name of The Open Group shall not be
22used in advertising or otherwise to promote the sale, use or other dealings
23in this Software without prior written authorization from The Open Group.
24
25Copyright 1989 by Hewlett-Packard Company, Palo Alto, California.
26
27			All Rights Reserved
28
29Permission to use, copy, modify, and distribute this software and its
30documentation for any purpose and without fee is hereby granted,
31provided that the above copyright notice appear in all copies and that
32both that copyright notice and this permission notice appear in
33supporting documentation, and that the name of Hewlett-Packard not be
34used in advertising or publicity pertaining to distribution of the
35software without specific, written prior permission.
36
37HEWLETT-PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
38ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
39HEWLETT-PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
40ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
41WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
42ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
43SOFTWARE.
44
45********************************************************/
46
47/***********************************************************************
48 *
49 * Extension function to grab an extension device.
50 *
51 */
52
53#ifdef HAVE_DIX_CONFIG_H
54#include <dix-config.h>
55#endif
56
57#include "inputstr.h"           /* DeviceIntPtr      */
58#include "windowstr.h"          /* window structure  */
59#include <X11/extensions/XI.h>
60#include <X11/extensions/XIproto.h>
61#include "exglobals.h"
62#include "dixevents.h"          /* GrabDevice */
63
64#include "grabdev.h"
65
66extern XExtEventInfo EventInfo[];
67extern int ExtEventIndex;
68
69/***********************************************************************
70 *
71 * Swap the request if the requestor has a different byte order than us.
72 *
73 */
74
75int _X_COLD
76SProcXGrabDevice(ClientPtr client)
77{
78    REQUEST(xGrabDeviceReq);
79    swaps(&stuff->length);
80    REQUEST_AT_LEAST_SIZE(xGrabDeviceReq);
81    swapl(&stuff->grabWindow);
82    swapl(&stuff->time);
83    swaps(&stuff->event_count);
84
85    if (stuff->length !=
86        bytes_to_int32(sizeof(xGrabDeviceReq)) + stuff->event_count)
87        return BadLength;
88
89    SwapLongs((CARD32 *) (&stuff[1]), stuff->event_count);
90
91    return (ProcXGrabDevice(client));
92}
93
94/***********************************************************************
95 *
96 * Grab an extension device.
97 *
98 */
99
100int
101ProcXGrabDevice(ClientPtr client)
102{
103    int rc;
104    xGrabDeviceReply rep;
105    DeviceIntPtr dev;
106    GrabMask mask;
107    struct tmask tmp[EMASKSIZE];
108
109    REQUEST(xGrabDeviceReq);
110    REQUEST_AT_LEAST_SIZE(xGrabDeviceReq);
111
112    if (stuff->length !=
113        bytes_to_int32(sizeof(xGrabDeviceReq)) + stuff->event_count)
114        return BadLength;
115
116    rep = (xGrabDeviceReply) {
117        .repType = X_Reply,
118        .RepType = X_GrabDevice,
119        .sequenceNumber = client->sequence,
120        .length = 0,
121    };
122
123    rc = dixLookupDevice(&dev, stuff->deviceid, client, DixGrabAccess);
124    if (rc != Success)
125        return rc;
126
127    if ((rc = CreateMaskFromList(client, (XEventClass *) &stuff[1],
128                                 stuff->event_count, tmp, dev,
129                                 X_GrabDevice)) != Success)
130        return rc;
131
132    mask.xi = tmp[stuff->deviceid].mask;
133
134    rc = GrabDevice(client, dev, stuff->other_devices_mode,
135                    stuff->this_device_mode, stuff->grabWindow,
136                    stuff->ownerEvents, stuff->time,
137                    &mask, XI, None, None, &rep.status);
138
139    if (rc != Success)
140        return rc;
141
142    WriteReplyToClient(client, sizeof(xGrabDeviceReply), &rep);
143    return Success;
144}
145
146/***********************************************************************
147 *
148 * This procedure creates an event mask from a list of XEventClasses.
149 *
150 * Procedure is as follows:
151 * An XEventClass is (deviceid << 8 | eventtype). For each entry in the list,
152 * get the device. Then run through all available event indices (those are
153 * set when XI starts up) and binary OR's the device's mask to whatever the
154 * event mask for the given event type was.
155 * If an error occurs, it is sent to the client. Errors are generated if
156 *  - if the device given in the event classs is invalid
157 *  - if the device in the class list is not the device given as parameter (no
158 *  error if parameter is NULL)
159 *
160 * mask has to be size EMASKSIZE and pre-allocated.
161 *
162 * @param client The client to send the error to (if one occurs)
163 * @param list List of event classes as sent from the client.
164 * @param count Number of elements in list.
165 * @param mask Preallocated mask (size EMASKSIZE).
166 * @param dev The device we're creating masks for.
167 * @param req The request we're processing. Used to fill in error fields.
168 */
169
170int
171CreateMaskFromList(ClientPtr client, XEventClass * list, int count,
172                   struct tmask *mask, DeviceIntPtr dev, int req)
173{
174    int rc, i, j;
175    int device;
176    DeviceIntPtr tdev;
177
178    memset(mask, 0, EMASKSIZE * sizeof(struct tmask));
179
180    for (i = 0; i < count; i++, list++) {
181        device = *list >> 8;
182        if (device > 255)
183            return BadClass;
184
185        rc = dixLookupDevice(&tdev, device, client, DixUseAccess);
186        if (rc != BadDevice && rc != Success)
187            return rc;
188        if (rc == BadDevice || (dev != NULL && tdev != dev))
189            return BadClass;
190
191        for (j = 0; j < ExtEventIndex; j++)
192            if (EventInfo[j].type == (*list & 0xff)) {
193                mask[device].mask |= EventInfo[j].mask;
194                mask[device].dev = (void *) tdev;
195                break;
196            }
197    }
198    return Success;
199}
200
201/***********************************************************************
202 *
203 * This procedure writes the reply for the XGrabDevice function,
204 * if the client and server have a different byte ordering.
205 *
206 */
207
208void _X_COLD
209SRepXGrabDevice(ClientPtr client, int size, xGrabDeviceReply * rep)
210{
211    swaps(&rep->sequenceNumber);
212    swapl(&rep->length);
213    WriteToClient(client, size, rep);
214}
215