summaryrefslogtreecommitdiff
path: root/include/privates.h
blob: 2b0040cba40f22c7be5672969e5947f6ee5e96cb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
/***********************************************************

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
AUTHOR 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.

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

#ifndef PRIVATES_H
#define PRIVATES_H 1

#include <X11/Xdefs.h>
#include <X11/Xosdefs.h>
#include <X11/Xfuncproto.h>
#include "misc.h"

/*****************************************************************
 * STUFF FOR PRIVATES
 *****************************************************************/

typedef struct _Private PrivateRec, *PrivatePtr;

typedef enum {
    /* XSELinux uses the same private keys for numerous objects */
    PRIVATE_XSELINUX,

    /* Otherwise, you get a private in just the requested structure
     */
    /* These can have objects created before all of the keys are registered */
    PRIVATE_SCREEN,
    PRIVATE_EXTENSION,
    PRIVATE_COLORMAP,

    /* These cannot have any objects before all relevant keys are registered */
    PRIVATE_DEVICE,
    PRIVATE_CLIENT,
    PRIVATE_PROPERTY,
    PRIVATE_SELECTION,
    PRIVATE_WINDOW,
    PRIVATE_PIXMAP,
    PRIVATE_GC,
    PRIVATE_CURSOR,
    PRIVATE_CURSOR_BITS,

    /* extension privates */
    PRIVATE_DBE_WINDOW,
    PRIVATE_DAMAGE,
    PRIVATE_GLYPH,
    PRIVATE_GLYPHSET,
    PRIVATE_PICTURE,
    PRIVATE_SYNC_FENCE,

    /* last private type */
    PRIVATE_LAST,
} DevPrivateType;

typedef struct _DevPrivateKeyRec {
    int			offset;
    int			size;
    Bool		initialized;
    Bool		allocated;
    DevPrivateType	type;
    struct _DevPrivateKeyRec	*next;
} DevPrivateKeyRec, *DevPrivateKey;

typedef struct _DevScreenPrivateKeyRec {
    DevPrivateKeyRec	screenKey;
} DevScreenPrivateKeyRec, *DevScreenPrivateKey;

/*
 * Let drivers know how to initialize private keys
 */

#define HAS_DEVPRIVATEKEYREC		1
#define HAS_DIXREGISTERPRIVATEKEY	1

/*
 * Register a new private index for the private type.
 *
 * This initializes the specified key and optionally requests pre-allocated
 * private space for your driver/module. If you request no extra space, you
 * may set and get a single pointer value using this private key. Otherwise,
 * you can get the address of the extra space and store whatever data you like
 * there.
 *
 * You may call dixRegisterPrivateKey more than once on the same key, but the
 * size and type must match or the server will abort.
 *
 * dixRegisterPrivateKey returns FALSE if it fails to allocate memory
 * during its operation.
 */
extern _X_EXPORT Bool
dixRegisterPrivateKey(DevPrivateKey key, DevPrivateType type, unsigned size);

/*
 * Check whether a private key has been registered
 */
static inline Bool
dixPrivateKeyRegistered(DevPrivateKey key)
{
    return key->initialized;
}

/*
 * Get the address of the private storage.
 *
 * For keys with pre-defined storage, this gets the base of that storage
 * Otherwise, it returns the place where the private pointer is stored.
 */
static inline void *
dixGetPrivateAddr(PrivatePtr *privates, const DevPrivateKey key)
{
    assert(key->initialized);
    return (char *) (*privates) + key->offset;
}

/*
 * Fetch a private pointer stored in the object
 *
 * Returns the pointer stored with dixSetPrivate.
 * This must only be used with keys that have
 * no pre-defined storage
 */
static inline void *
dixGetPrivate(PrivatePtr *privates, const DevPrivateKey key)
{
    assert (key->size == 0);
    return *(void **) dixGetPrivateAddr(privates, key);
}

/*
 * Associate 'val' with 'key' in 'privates' so that later calls to
 * dixLookupPrivate(privates, key) will return 'val'.
 */
static inline void
dixSetPrivate(PrivatePtr *privates, const DevPrivateKey key, pointer val)
{
    assert (key->size == 0);
    *(pointer *) dixGetPrivateAddr(privates, key) = val;
}

#include "dix.h"
#include "resource.h"

/*
 * Lookup a pointer to the private record.
 *
 * For privates with defined storage, return the address of the
 * storage. For privates without defined storage, return the pointer
 * contents
 */
static inline pointer
dixLookupPrivate(PrivatePtr *privates, const DevPrivateKey key)
{
    if (key->size)
	return dixGetPrivateAddr(privates, key);
    else
	return dixGetPrivate(privates, key);
}

/*
 * Look up the address of the pointer to the storage
 *
 * This returns the place where the private pointer is stored,
 * which is only valid for privates without predefined storage.
 */
static inline pointer *
dixLookupPrivateAddr(PrivatePtr *privates, const DevPrivateKey key)
{
    assert (key->size == 0);
    return (pointer *)dixGetPrivateAddr(privates, key);
}

extern _X_EXPORT Bool
dixRegisterScreenPrivateKey(DevScreenPrivateKey key, ScreenPtr pScreen, DevPrivateType type, unsigned size);

extern _X_EXPORT DevPrivateKey
_dixGetScreenPrivateKey(const DevScreenPrivateKey key, ScreenPtr pScreen);

static inline void *
dixGetScreenPrivateAddr(PrivatePtr *privates, const DevScreenPrivateKey key, ScreenPtr pScreen)
{
    return dixGetPrivateAddr(privates, _dixGetScreenPrivateKey(key, pScreen));
}

static inline void *
dixGetScreenPrivate(PrivatePtr *privates, const DevScreenPrivateKey key, ScreenPtr pScreen)
{
    return dixGetPrivate(privates, _dixGetScreenPrivateKey(key, pScreen));
}

static inline void
dixSetScreenPrivate(PrivatePtr *privates, const DevScreenPrivateKey key, ScreenPtr pScreen, pointer val)
{
    dixSetPrivate(privates, _dixGetScreenPrivateKey(key, pScreen), val);
}

static inline pointer
dixLookupScreenPrivate(PrivatePtr *privates, const DevScreenPrivateKey key, ScreenPtr pScreen)
{
    return dixLookupPrivate(privates, _dixGetScreenPrivateKey(key, pScreen));
}

static inline pointer *
dixLookupScreenPrivateAddr(PrivatePtr *privates, const DevScreenPrivateKey key, ScreenPtr pScreen)
{
    return dixLookupPrivateAddr(privates, _dixGetScreenPrivateKey(key, pScreen));
}

/*
 * Allocates private data separately from main object.
 *
 * For objects created during server initialization, this allows those
 * privates to be re-allocated as new private keys are registered.
 *
 * This includes screens, the serverClient, default colormaps and
 * extensions entries.
 */
extern _X_EXPORT Bool
dixAllocatePrivates(PrivatePtr *privates, DevPrivateType type);

/*
 * Frees separately allocated private data
 */
extern _X_EXPORT void
dixFreePrivates(PrivatePtr privates, DevPrivateType type);

/*
 * Initialize privates by zeroing them
 */
extern _X_EXPORT void
_dixInitPrivates(PrivatePtr *privates, void *addr, DevPrivateType type);

#define dixInitPrivates(o, v, type) _dixInitPrivates(&(o)->devPrivates, (v), type);

/*
 * Clean up privates
 */
extern _X_EXPORT void
_dixFiniPrivates(PrivatePtr privates, DevPrivateType type);

#define dixFiniPrivates(o,t)	_dixFiniPrivates((o)->devPrivates,t)

/*
 * Allocates private data at object creation time. Required
 * for almost all objects, except for the list described
 * above for dixAllocatePrivates.
 */
extern _X_EXPORT void *
_dixAllocateObjectWithPrivates(unsigned size, unsigned clear, unsigned offset, DevPrivateType type);

#define dixAllocateObjectWithPrivates(t, type) (t *) _dixAllocateObjectWithPrivates(sizeof(t), sizeof(t), offsetof(t, devPrivates), type)

extern _X_EXPORT void
_dixFreeObjectWithPrivates(void *object, PrivatePtr privates, DevPrivateType type);

#define dixFreeObjectWithPrivates(o,t) _dixFreeObjectWithPrivates(o, (o)->devPrivates, t)

/*
 * Return size of privates for the specified type
 */
extern _X_EXPORT int
dixPrivatesSize(DevPrivateType type);

/*
 * Dump out private stats to ErrorF
 */
extern void
dixPrivateUsage(void);

/*
 * Resets the privates subsystem.  dixResetPrivates is called from the main loop
 * before each server generation.  This function must only be called by main().
 */
extern _X_EXPORT void
dixResetPrivates(void);

/*
 * Looks up the offset where the devPrivates field is located.
 *
 * Returns -1 if the specified resource has no dev privates.
 * The position of the devPrivates field varies by structure
 * and calling code might only know the resource type, not the
 * structure definition.
 */
extern _X_EXPORT int
dixLookupPrivateOffset(RESTYPE type);

/*
 * Convenience macro for adding an offset to an object pointer
 * when making a call to one of the devPrivates functions
 */
#define DEVPRIV_AT(ptr, offset) ((PrivatePtr *)((char *)(ptr) + offset))

#endif /* PRIVATES_H */