summaryrefslogtreecommitdiffstats
path: root/unix/tkUnixEvent.c
blob: 8fa56d1485f4f274329da91f2f848ed6561dd29c (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
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
/* 
 * tkUnixEvent.c --
 *
 *	This file implements an event source for X displays for the
 *	UNIX version of Tk.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkUnixEvent.c,v 1.11.2.1 2003/07/16 01:20:13 mdejong Exp $
 */

#include "tkInt.h"
#include "tkUnixInt.h"
#include <signal.h>

/*
 * The following static indicates whether this module has been initialized
 * in the current thread.
 */

typedef struct ThreadSpecificData {
    int initialized;
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;

#if defined(TK_USE_INPUT_METHODS) && defined(PEEK_XCLOSEIM)
/*
 * Structure used to peek into internal XIM data structure.
 * This is only known to work with XFree86.
 */
struct XIMPeek {
    void *junk1, *junk2;
    XIC  ic_chain;
};
#endif

/*
 * Prototypes for procedures that are referenced only in this file:
 */

static void		DisplayCheckProc _ANSI_ARGS_((ClientData clientData,
			    int flags));
static void		DisplayExitHandler _ANSI_ARGS_((
			    ClientData clientData));
static void		DisplayFileProc _ANSI_ARGS_((ClientData clientData,
			    int flags));
static void		DisplaySetupProc _ANSI_ARGS_((ClientData clientData,
			    int flags));
static void		TransferXEventsToTcl _ANSI_ARGS_((Display *display));
#ifdef TK_USE_INPUT_METHODS
static void		OpenIM _ANSI_ARGS_((TkDisplay *dispPtr));
#endif


/*
 *----------------------------------------------------------------------
 *
 * TkCreateXEventSource --
 *
 *	This procedure is called during Tk initialization to create
 *	the event source for X Window events.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	A new event source is created.
 *
 *----------------------------------------------------------------------
 */

void
TkCreateXEventSource()
{
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    if (!tsdPtr->initialized) {
	tsdPtr->initialized = 1;
	Tcl_CreateEventSource(DisplaySetupProc, DisplayCheckProc, NULL);
	Tcl_CreateExitHandler(DisplayExitHandler, NULL);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * DisplayExitHandler --
 *
 *	This function is called during finalization to clean up the
 *	display module.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static void
DisplayExitHandler(clientData)
    ClientData clientData;	/* Not used. */
{
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    Tcl_DeleteEventSource(DisplaySetupProc, DisplayCheckProc, NULL);
    tsdPtr->initialized = 0;
}

/*
 *----------------------------------------------------------------------
 *
 * TkpOpenDisplay --
 *
 *	Allocates a new TkDisplay, opens the X display, and establishes
 *	the file handler for the connection.
 *
 * Results:
 *	A pointer to a Tk display structure.
 *
 * Side effects:
 *	Opens a display.
 *
 *----------------------------------------------------------------------
 */

TkDisplay *
TkpOpenDisplay(display_name)
    CONST char *display_name;
{
    TkDisplay *dispPtr;
    Display *display = XOpenDisplay(display_name);

    if (display == NULL) {
	return NULL;
    }
    dispPtr = (TkDisplay *) ckalloc(sizeof(TkDisplay));
    memset(dispPtr, 0, sizeof(TkDisplay));
    dispPtr->display = display;
#ifdef TK_USE_INPUT_METHODS
    OpenIM(dispPtr);
#endif
    Tcl_CreateFileHandler(ConnectionNumber(display), TCL_READABLE,
	    DisplayFileProc, (ClientData) dispPtr);
    return dispPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TkpCloseDisplay --
 *
 *	Cancels notifier callbacks and closes a display.  
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Deallocates the displayPtr and unix-specific resources.
 *
 *----------------------------------------------------------------------
 */

void
TkpCloseDisplay(dispPtr)
    TkDisplay *dispPtr;
{
    TkSendCleanup(dispPtr);

    TkFreeXId(dispPtr);

    TkWmCleanup(dispPtr);

#ifdef TK_USE_INPUT_METHODS
#if TK_XIM_SPOT
    if (dispPtr->inputXfs) {
	XFreeFontSet(dispPtr->display, dispPtr->inputXfs);
    }
#endif
    if (dispPtr->inputMethod) {
	/*
	 * Calling XCloseIM with an input context that has not
	 * been freed can cause a crash. This crash has been
	 * reproduced under Linux systems with XFree86 3.3
	 * and may have also been seen under Solaris 2.3.
	 * The crash is caused by a double free of memory
	 * inside the X library. Memory that was already
	 * deallocated may be accessed again inside XCloseIM.
	 * This bug can be avoided by making sure that a
	 * call to XDestroyIC is made for each XCreateIC call.
	 * This bug has been fixed in XFree86 4.2.99.2.
	 * The internal layout of the XIM structure changed
	 * in the XFree86 4.2 release so the test should
	 * not be run for with these new releases.
	 */

#if defined(TK_USE_INPUT_METHODS) && defined(PEEK_XCLOSEIM)
	int do_peek = 0;
	struct XIMPeek *peek;

	if (strstr(ServerVendor(dispPtr->display), "XFree86")) {
	    int vendrel = VendorRelease(dispPtr->display);
	    if (vendrel < 336) {
	        /* 3.3.4 and 3.3.5 */
	        do_peek = 1;
	    } else if (vendrel < 3900) {
	        /* Other 3.3.x versions */
	        do_peek = 1;
	    } else if (vendrel < 40000000) {
	        /* 4.0.x versions */
	        do_peek = 1;
	    } else {
	        /* Newer than 4.0 */
	        do_peek = 0;
	    }
	}

	if (do_peek) {
	    peek = (struct XIMPeek *) dispPtr->inputMethod;
	    if (peek->ic_chain != NULL)
	        panic("input contexts not freed before XCloseIM");
	}
#endif
	XCloseIM(dispPtr->inputMethod);
    }
#endif

    if (dispPtr->display != 0) {
	Tcl_DeleteFileHandler(ConnectionNumber(dispPtr->display));
	(void) XSync(dispPtr->display, False);
	(void) XCloseDisplay(dispPtr->display);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * DisplaySetupProc --
 *
 *	This procedure implements the setup part of the UNIX X display
 *	event source.  It is invoked by Tcl_DoOneEvent before entering
 *	the notifier to check for events on all displays.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If data is queued on a display inside Xlib, then the maximum
 *	block time will be set to 0 to ensure that the notifier returns
 *	control to Tcl even if there is no more data on the X connection.
 *
 *----------------------------------------------------------------------
 */

static void
DisplaySetupProc(clientData, flags)
    ClientData clientData;	/* Not used. */
    int flags;
{
    TkDisplay *dispPtr;
    static Tcl_Time blockTime = { 0, 0 };

    if (!(flags & TCL_WINDOW_EVENTS)) {
	return;
    }

    for (dispPtr = TkGetDisplayList(); dispPtr != NULL;
	 dispPtr = dispPtr->nextPtr) {

	/*
	 * Flush the display. If data is pending on the X queue, set
	 * the block time to zero.  This ensures that we won't block
	 * in the notifier if there is data in the X queue, but not on
	 * the server socket.
	 */

	XFlush(dispPtr->display);
	if (QLength(dispPtr->display) > 0) {
	    Tcl_SetMaxBlockTime(&blockTime);
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 *  TransferXEventsToTcl
 *
 *      Transfer events from the X event queue to the Tk event queue.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Moves queued X events onto the Tcl event queue.
 *
 *----------------------------------------------------------------------
 */

static void
TransferXEventsToTcl(display)
    Display *display;
{
    int numFound;
    XEvent event;

    numFound = QLength(display);

    /*
     * Transfer events from the X event queue to the Tk event queue.
     */

    while (numFound > 0) {
	XNextEvent(display, &event);
	Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
	numFound--;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * DisplayCheckProc --
 *
 *	This procedure checks for events sitting in the X event
 *	queue.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Moves queued events onto the Tcl event queue.
 *
 *----------------------------------------------------------------------
 */

static void
DisplayCheckProc(clientData, flags)
    ClientData clientData;	/* Not used. */
    int flags;
{
    TkDisplay *dispPtr;

    if (!(flags & TCL_WINDOW_EVENTS)) {
	return;
    }

    for (dispPtr = TkGetDisplayList(); dispPtr != NULL;
	 dispPtr = dispPtr->nextPtr) {
	XFlush(dispPtr->display);
	TransferXEventsToTcl(dispPtr->display);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * DisplayFileProc --
 *
 *	This procedure implements the file handler for the X connection.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Makes entries on the Tcl event queue for all the events available
 *	from all the displays.
 *
 *----------------------------------------------------------------------
 */

static void
DisplayFileProc(clientData, flags)
    ClientData clientData;		/* The display pointer. */
    int flags;				/* Should be TCL_READABLE. */
{
    TkDisplay *dispPtr = (TkDisplay *) clientData;
    Display *display = dispPtr->display;
    int numFound;

    XFlush(display);
    numFound = XEventsQueued(display, QueuedAfterReading);
    if (numFound == 0) {
	
	/*
	 * Things are very tricky if there aren't any events readable
	 * at this point (after all, there was supposedly data
	 * available on the connection).  A couple of things could
	 * have occurred:
	 * 
	 * One possibility is that there were only error events in the
	 * input from the server.  If this happens, we should return
	 * (we don't want to go to sleep in XNextEvent below, since
	 * this would block out other sources of input to the
	 * process).
	 *
	 * Another possibility is that our connection to the server
	 * has been closed.  This will not necessarily be detected in
	 * XEventsQueued (!!), so if we just return then there will be
	 * an infinite loop.  To detect such an error, generate a NoOp
	 * protocol request to exercise the connection to the server,
	 * then return.  However, must disable SIGPIPE while sending
	 * the request, or else the process will die from the signal
	 * and won't invoke the X error function to print a nice (?!)
	 * message.
	 */
	
	void (*oldHandler)();
	
	oldHandler = (void (*)()) signal(SIGPIPE, SIG_IGN);
	XNoOp(display);
	XFlush(display);
	(void) signal(SIGPIPE, oldHandler);
    }
    
    TransferXEventsToTcl(display);
}

/*
 *----------------------------------------------------------------------
 *
 * TkUnixDoOneXEvent --
 *
 *	This routine waits for an X event to be processed or for
 *	a timeout to occur.  The timeout is specified as an absolute
 *	time.  This routine is called when Tk needs to wait for a
 *	particular X event without letting arbitrary events be
 *	processed.  The caller will typically call Tk_RestrictEvents
 *	to set up an event filter before calling this routine.  This
 *	routine will service at most one event per invocation.
 *
 * Results:
 *	Returns 0 if the timeout has expired, otherwise returns 1.
 *
 * Side effects:
 *	Can invoke arbitrary Tcl scripts.
 *
 *----------------------------------------------------------------------
 */

int
TkUnixDoOneXEvent(timePtr)
    Tcl_Time *timePtr;		/* Specifies the absolute time when the
				 * call should time out. */
{
    TkDisplay *dispPtr;
    static fd_mask readMask[MASK_SIZE];
    struct timeval blockTime, *timeoutPtr;
    Tcl_Time now;
    int fd, index, bit, numFound, numFdBits = 0;

    /*
     * Look for queued events first. 
     */

    if (Tcl_ServiceEvent(TCL_WINDOW_EVENTS)) {
	return 1;
    }

    /*
     * Compute the next block time and check to see if we have timed out.
     * Note that HP-UX defines tv_sec to be unsigned so we have to be
     * careful in our arithmetic.
     */

    if (timePtr) {
	TclpGetTime(&now);
	blockTime.tv_sec = timePtr->sec;
	blockTime.tv_usec = timePtr->usec - now.usec;
	if (blockTime.tv_usec < 0) {
	    now.sec += 1;
	    blockTime.tv_usec += 1000000;
	}
	if (blockTime.tv_sec < now.sec) {
	    blockTime.tv_sec = 0;
	    blockTime.tv_usec = 0;
	} else {
	    blockTime.tv_sec -= now.sec;
	}
	timeoutPtr = &blockTime;
    } else {
	timeoutPtr = NULL;
    }

    /*
     * Set up the select mask for all of the displays.  If a display has
     * data pending, then we want to poll instead of blocking.
     */

    memset((VOID *) readMask, 0, MASK_SIZE*sizeof(fd_mask));
    for (dispPtr = TkGetDisplayList(); dispPtr != NULL;
	 dispPtr = dispPtr->nextPtr) {
	XFlush(dispPtr->display);
	if (QLength(dispPtr->display) > 0) {
	    blockTime.tv_sec = 0;
	    blockTime.tv_usec = 0;
	}
	fd = ConnectionNumber(dispPtr->display);
	index = fd/(NBBY*sizeof(fd_mask));
	bit = 1 << (fd%(NBBY*sizeof(fd_mask)));
	readMask[index] |= bit;
	if (numFdBits <= fd) {
	    numFdBits = fd+1;
	}
    }

    numFound = select(numFdBits, (SELECT_MASK *) &readMask[0], NULL, NULL,
	    timeoutPtr);
    if (numFound <= 0) {
	/*
	 * Some systems don't clear the masks after an error, so
	 * we have to do it here.
	 */

	memset((VOID *) readMask, 0, MASK_SIZE*sizeof(fd_mask));
    }

    /*
     * Process any new events on the display connections.
     */

    for (dispPtr = TkGetDisplayList(); dispPtr != NULL;
	 dispPtr = dispPtr->nextPtr) {
	fd = ConnectionNumber(dispPtr->display);
	index = fd/(NBBY*sizeof(fd_mask));
	bit = 1 << (fd%(NBBY*sizeof(fd_mask)));
	if ((readMask[index] & bit) || (QLength(dispPtr->display) > 0)) {
	    DisplayFileProc((ClientData)dispPtr, TCL_READABLE);
	}
    }
    if (Tcl_ServiceEvent(TCL_WINDOW_EVENTS)) {
	return 1;
    }

    /*
     * Check to see if we timed out.
     */

    if (timePtr) {
	TclpGetTime(&now);
	if ((now.sec > timePtr->sec) || ((now.sec == timePtr->sec)
		&& (now.usec > timePtr->usec))) {
	    return 0;
	}
    }

    /*
     * We had an event but we did not generate a Tcl event from it. Behave
     * as though we dealt with it. (JYL&SS)
     */

    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * TkpSync --
 *
 *	This routine ensures that all pending X requests have been
 *	seen by the server, and that any pending X events have been
 *	moved onto the Tk event queue.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Places new events on the Tk event queue.
 *
 *----------------------------------------------------------------------
 */

void
TkpSync(display)
    Display *display;		/* Display to sync. */
{
    XSync(display, False);

    /*
     * Transfer events from the X event queue to the Tk event queue.
     */
    TransferXEventsToTcl(display);
}
#ifdef TK_USE_INPUT_METHODS

/* 
 *--------------------------------------------------------------
 *
 * OpenIM --
 *
 *	Tries to open an X input method, associated with the
 *	given display.  Right now we can only deal with a bare-bones
 *	input style:  no preedit, and no status.
 *
 * Results:
 *	Stores the input method in dispPtr->inputMethod;  if there isn't
 *	a suitable input method, then NULL is stored in dispPtr->inputMethod.
 *
 * Side effects:
 *	An input method gets opened.
 *
 *--------------------------------------------------------------
 */

static void
OpenIM(dispPtr)
    TkDisplay *dispPtr;		/* Tk's structure for the display. */
{
    unsigned short i;
    XIMStyles *stylePtr;

    if (XSetLocaleModifiers("") == NULL) {
	goto error;
    }

    dispPtr->inputMethod = XOpenIM(dispPtr->display, NULL, NULL, NULL);
    if (dispPtr->inputMethod == NULL) {
	return;
    }

    if ((XGetIMValues(dispPtr->inputMethod, XNQueryInputStyle, &stylePtr,
	    NULL) != NULL) || (stylePtr == NULL)) {
	goto error;
    }
#if TK_XIM_SPOT
    /*
     * If we want to do over-the-spot XIM, we have to check that this
     * mode is supported.  If not we will fall-through to the check below.
     */
    for (i = 0; i < stylePtr->count_styles; i++) {
	if (stylePtr->supported_styles[i]
		== (XIMPreeditPosition | XIMStatusNothing)) {
	    dispPtr->flags |= TK_DISPLAY_XIM_SPOT;
	    XFree(stylePtr);
	    return;
	}
    }
#endif
    for (i = 0; i < stylePtr->count_styles; i++) {
	if (stylePtr->supported_styles[i]
		== (XIMPreeditNothing | XIMStatusNothing)) {
	    XFree(stylePtr);
	    return;
	}
    }
    XFree(stylePtr);

    error:

    if (dispPtr->inputMethod) {
	/*
	 * This call should not suffer from any core dumping problems
	 * since we have not allocated any input contexts.
	 */
	XCloseIM(dispPtr->inputMethod);
	dispPtr->inputMethod = NULL;
    }
}
#endif /* TK_USE_INPUT_METHODS */