summaryrefslogtreecommitdiffstats
path: root/main.c
blob: 13ad4167767e15e5ecf61ef1f3830c51c5f86b6a (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
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
/*
 *  This file is called main.c, because it contains most of the new functions
 *  for use with LibVNCServer.
 *
 *  LibVNCServer (C) 2001 Johannes E. Schindelin <Johannes.Schindelin@gmx.de>
 *  Original OSXvnc (C) 2001 Dan McGuirk <mcguirk@incompleteness.net>.
 *  Original Xvnc (C) 1999 AT&T Laboratories Cambridge.  
 *  All Rights Reserved.
 *
 *  see GPL (latest version) for full details
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>

#ifndef false
#define false 0
#define true -1
#endif

#include <sys/types.h>
#ifndef WIN32
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#endif
#include <signal.h>
#include <time.h>

#include "rfb.h"
#include "sraRegion.h"

MUTEX(logMutex);

int rfbEnableLogging=1;

/* we cannot compare to _LITTLE_ENDIAN, because some systems
   (as Solaris) assume little endian if _LITTLE_ENDIAN is
   defined, even if _BYTE_ORDER is not _LITTLE_ENDIAN */
char rfbEndianTest = (_BYTE_ORDER == 1234);

/* from rfbserver.c */
void rfbIncrClientRef(rfbClientPtr cl);
void rfbDecrClientRef(rfbClientPtr cl);

void rfbLogEnable(int enabled) {
  rfbEnableLogging=enabled;
}

/*
 * rfbLog prints a time-stamped message to the log file (stderr).
 */

void
rfbLog(const char *format, ...)
{
    va_list args;
    char buf[256];
    time_t log_clock;

    if(!rfbEnableLogging)
      return;

    LOCK(logMutex);
    va_start(args, format);

    time(&log_clock);
    strftime(buf, 255, "%d/%m/%Y %T ", localtime(&log_clock));
    fprintf(stderr,buf);

    vfprintf(stderr, format, args);
    fflush(stderr);

    va_end(args);
    UNLOCK(logMutex);
}

void rfbLogPerror(const char *str)
{
    rfbLog("%s: %s\n", str, strerror(errno));
}

void rfbScheduleCopyRegion(rfbScreenInfoPtr rfbScreen,sraRegionPtr copyRegion,int dx,int dy)
{  
   rfbClientIteratorPtr iterator;
   rfbClientPtr cl;

   rfbUndrawCursor(rfbScreen);
  
   iterator=rfbGetClientIterator(rfbScreen);
   while((cl=rfbClientIteratorNext(iterator))) {
     LOCK(cl->updateMutex);
     if(cl->useCopyRect) {
       sraRegionPtr modifiedRegionBackup;
       if(!sraRgnEmpty(cl->copyRegion)) {
	  if(cl->copyDX!=dx || cl->copyDY!=dy) {
	     /* if a copyRegion was not yet executed, treat it as a
	      * modifiedRegion. The idea: in this case it could be
	      * source of the new copyRect or modified anyway. */
	     sraRgnOr(cl->modifiedRegion,cl->copyRegion);
	     sraRgnMakeEmpty(cl->copyRegion);
	  } else {
	     /* we have to set the intersection of the source of the copy
	      * and the old copy to modified. */
	     modifiedRegionBackup=sraRgnCreateRgn(copyRegion);
	     sraRgnOffset(modifiedRegionBackup,-dx,-dy);
	     sraRgnAnd(modifiedRegionBackup,cl->copyRegion);
	     sraRgnOr(cl->modifiedRegion,modifiedRegionBackup);
	     sraRgnDestroy(modifiedRegionBackup);
	  }
       }
	  
       sraRgnOr(cl->copyRegion,copyRegion);
       cl->copyDX = dx;
       cl->copyDY = dy;

       /* if there were modified regions, which are now copied,
	* mark them as modified, because the source of these can be overlapped
	* either by new modified or now copied regions. */
       modifiedRegionBackup=sraRgnCreateRgn(cl->modifiedRegion);
       sraRgnOffset(modifiedRegionBackup,dx,dy);
       sraRgnAnd(modifiedRegionBackup,cl->copyRegion);
       sraRgnOr(cl->modifiedRegion,modifiedRegionBackup);
       sraRgnDestroy(modifiedRegionBackup);

#if 0
//TODO: is this needed? Or does it mess up deferring?
       /* while(!sraRgnEmpty(cl->copyRegion)) */ {
#ifdef HAVE_PTHREADS
	 if(!cl->screen->backgroundLoop)
#endif
	   {
	     sraRegionPtr updateRegion = sraRgnCreateRgn(cl->modifiedRegion);
	     sraRgnOr(updateRegion,cl->copyRegion);
	     UNLOCK(cl->updateMutex);
	     rfbSendFramebufferUpdate(cl,updateRegion);
	     sraRgnDestroy(updateRegion);
	     continue;
	   }
       }
#endif
     } else {
       sraRgnOr(cl->modifiedRegion,copyRegion);
     }
     TSIGNAL(cl->updateCond);
     UNLOCK(cl->updateMutex);
   }

   rfbReleaseClientIterator(iterator);
}

void rfbDoCopyRegion(rfbScreenInfoPtr rfbScreen,sraRegionPtr copyRegion,int dx,int dy)
{
   sraRectangleIterator* i;
   sraRect rect;
   int j,widthInBytes,bpp=rfbScreen->rfbServerFormat.bitsPerPixel/8,
    rowstride=rfbScreen->paddedWidthInBytes;
   char *in,*out;

   rfbUndrawCursor(rfbScreen);
  
   /* copy it, really */
   i = sraRgnGetReverseIterator(copyRegion,dx<0,dy<0);
   while(sraRgnIteratorNext(i,&rect)) {
     widthInBytes = (rect.x2-rect.x1)*bpp;
     out = rfbScreen->frameBuffer+rect.x1*bpp+rect.y1*rowstride;
     in = rfbScreen->frameBuffer+(rect.x1-dx)*bpp+(rect.y1-dy)*rowstride;
     if(dy<0)
       for(j=rect.y1;j<rect.y2;j++,out+=rowstride,in+=rowstride)
	 memmove(out,in,widthInBytes);
     else {
       out += rowstride*(rect.y2-rect.y1-1);
       in += rowstride*(rect.y2-rect.y1-1);
       for(j=rect.y2-1;j>=rect.y1;j--,out-=rowstride,in-=rowstride)
	 memmove(out,in,widthInBytes);
     }
   }
  
   rfbScheduleCopyRegion(rfbScreen,copyRegion,dx,dy);
}

void rfbDoCopyRect(rfbScreenInfoPtr rfbScreen,int x1,int y1,int x2,int y2,int dx,int dy)
{
  sraRegionPtr region = sraRgnCreateRect(x1,y1,x2,y2);
  rfbDoCopyRegion(rfbScreen,region,dx,dy);
}

void rfbScheduleCopyRect(rfbScreenInfoPtr rfbScreen,int x1,int y1,int x2,int y2,int dx,int dy)
{
  sraRegionPtr region = sraRgnCreateRect(x1,y1,x2,y2);
  rfbScheduleCopyRegion(rfbScreen,region,dx,dy);
}

void rfbMarkRegionAsModified(rfbScreenInfoPtr rfbScreen,sraRegionPtr modRegion)
{
   rfbClientIteratorPtr iterator;
   rfbClientPtr cl;

   iterator=rfbGetClientIterator(rfbScreen);
   while((cl=rfbClientIteratorNext(iterator))) {
     LOCK(cl->updateMutex);
     sraRgnOr(cl->modifiedRegion,modRegion);
     TSIGNAL(cl->updateCond);
     UNLOCK(cl->updateMutex);
   }

   rfbReleaseClientIterator(iterator);
}

void rfbMarkRectAsModified(rfbScreenInfoPtr rfbScreen,int x1,int y1,int x2,int y2)
{
   sraRegionPtr region;
   int i;

   if(x1>x2) { i=x1; x1=x2; x2=i; }
   if(x1<0) x1=0;
   if(x2>=rfbScreen->width) x2=rfbScreen->width-1;
   if(x1==x2) return;
   
   if(y1>y2) { i=y1; y1=y2; y2=i; }
   if(y1<0) y1=0;
   if(y2>=rfbScreen->height) y2=rfbScreen->height-1;
   if(y1==y2) return;
   
   region = sraRgnCreateRect(x1,y1,x2,y2);
   rfbMarkRegionAsModified(rfbScreen,region);
   sraRgnDestroy(region);
}

#ifdef HAVE_PTHREADS
static void *
clientOutput(void *data)
{
    rfbClientPtr cl = (rfbClientPtr)data;
    Bool haveUpdate;
    sraRegion* updateRegion;

    while (1) {
        haveUpdate = false;
        while (!haveUpdate) {
            if (cl->sock == -1) {
                /* Client has disconnected. */
                return NULL;
            }
	    LOCK(cl->updateMutex);
	    haveUpdate = FB_UPDATE_PENDING(cl);
	    if(!haveUpdate) {
		updateRegion = sraRgnCreateRgn(cl->modifiedRegion);
		haveUpdate = sraRgnAnd(updateRegion,cl->requestedRegion);
		sraRgnDestroy(updateRegion);
	    }
	    UNLOCK(cl->updateMutex);

            if (!haveUpdate) {
                WAIT(cl->updateCond, cl->updateMutex);
		UNLOCK(cl->updateMutex); /* we really needn't lock now. */
            }
        }
        
        /* OK, now, to save bandwidth, wait a little while for more
           updates to come along. */
        usleep(cl->screen->rfbDeferUpdateTime * 1000);

        /* Now, get the region we're going to update, and remove
           it from cl->modifiedRegion _before_ we send the update.
           That way, if anything that overlaps the region we're sending
           is updated, we'll be sure to do another update later. */
        LOCK(cl->updateMutex);
	updateRegion = sraRgnCreateRgn(cl->modifiedRegion);
        UNLOCK(cl->updateMutex);

        /* Now actually send the update. */
	rfbIncrClientRef(cl);
        rfbSendFramebufferUpdate(cl, updateRegion);
	rfbDecrClientRef(cl);

	sraRgnDestroy(updateRegion);
    }

    return NULL;
}

static void *
clientInput(void *data)
{
    rfbClientPtr cl = (rfbClientPtr)data;
    pthread_t output_thread;
    pthread_create(&output_thread, NULL, clientOutput, (void *)cl);

    while (1) {
        rfbProcessClientMessage(cl);
        if (cl->sock == -1) {
            /* Client has disconnected. */
            break;
        }
    }

    /* Get rid of the output thread. */
    LOCK(cl->updateMutex);
    TSIGNAL(cl->updateCond);
    UNLOCK(cl->updateMutex);
    IF_PTHREADS(pthread_join(output_thread, NULL));

    rfbClientConnectionGone(cl);

    return NULL;
}

static void*
listenerRun(void *data)
{
    rfbScreenInfoPtr rfbScreen=(rfbScreenInfoPtr)data;
    int client_fd;
    struct sockaddr_in peer;
    rfbClientPtr cl;
    socklen_t len;

    len = sizeof(peer);

    /* TODO: this thread wont die by restarting the server */
    while ((client_fd = accept(rfbScreen->rfbListenSock, 
                               (struct sockaddr*)&peer, &len)) >= 0) {
        cl = rfbNewClient(rfbScreen,client_fd);
        len = sizeof(peer);

	if (cl && !cl->onHold )
		rfbStartOnHoldClient(cl);
    }
}

void 
rfbStartOnHoldClient(rfbClientPtr cl)
{
    pthread_create(&cl->client_thread, NULL, clientInput, (void *)cl);
}

#else

void 
rfbStartOnHoldClient(rfbClientPtr cl)
{
	cl->onHold = FALSE;
}

#endif

void 
rfbRefuseOnHoldClient(rfbClientPtr cl)
{
    rfbCloseClient(cl);
    rfbClientConnectionGone(cl);
}

static void
defaultKbdAddEvent(Bool down, KeySym keySym, rfbClientPtr cl)
{
}

void
defaultPtrAddEvent(int buttonMask, int x, int y, rfbClientPtr cl)
{
   if(x!=cl->screen->cursorX || y!=cl->screen->cursorY) {
      if(cl->screen->cursorIsDrawn)
	rfbUndrawCursor(cl->screen);
      LOCK(cl->screen->cursorMutex);
      if(!cl->screen->cursorIsDrawn) {
	  cl->screen->cursorX = x;
	  cl->screen->cursorY = y;
      }
      UNLOCK(cl->screen->cursorMutex);
   }
}

void defaultSetXCutText(char* text, int len, rfbClientPtr cl)
{
}

/* TODO: add a nice VNC or RFB cursor */

#if defined(WIN32) || defined(sparc)
static rfbCursor myCursor = 
{
   "\000\102\044\030\044\102\000",
   "\347\347\176\074\176\347\347",
   8, 7, 3, 3,
   0, 0, 0,
   0xffff, 0xffff, 0xffff,
   0
};
#else
static rfbCursor myCursor = 
{
   source: "\000\102\044\030\044\102\000",
   mask:   "\347\347\176\074\176\347\347",
   width: 8, height: 7, xhot: 3, yhot: 3,
   /*
     width: 8, height: 7, xhot: 0, yhot: 0,
     source: "\000\074\176\146\176\074\000",
     mask:   "\176\377\377\377\377\377\176",
   */
   foreRed: 0, foreGreen: 0, foreBlue: 0,
   backRed: 0xffff, backGreen: 0xffff, backBlue: 0xffff,
   richSource: 0
};
#endif

rfbCursorPtr defaultGetCursorPtr(rfbClientPtr cl)
{
   return(cl->screen->cursor);
}

/* response is cl->authChallenge vncEncrypted with passwd */
Bool defaultPasswordCheck(rfbClientPtr cl,const char* response,int len)
{
  int i;
  char *passwd=vncDecryptPasswdFromFile(cl->screen->rfbAuthPasswdData);

  if(!passwd) {
    rfbLog("Couldn't read password file: %s\n",cl->screen->rfbAuthPasswdData);
    return(FALSE);
  }

  vncEncryptBytes(cl->authChallenge, passwd);

  /* Lose the password from memory */
  for (i = strlen(passwd); i >= 0; i--) {
    passwd[i] = '\0';
  }

  free(passwd);

  if (memcmp(cl->authChallenge, response, len) != 0) {
    rfbLog("rfbAuthProcessClientMessage: authentication failed from %s\n",
	   cl->host);
    return(FALSE);
  }

  return(TRUE);
}

/* for this method, rfbAuthPasswdData is really a pointer to an array
   of char*'s, where the last pointer is 0. */
Bool rfbCheckPasswordByList(rfbClientPtr cl,const char* response,int len)
{
  char **passwds;

  for(passwds=(char**)cl->screen->rfbAuthPasswdData;*passwds;passwds++) {
    vncEncryptBytes(cl->authChallenge, *passwds);

    if (memcmp(cl->authChallenge, response, len) == 0)
      return(TRUE);
  }

  rfbLog("rfbAuthProcessClientMessage: authentication failed from %s\n",
	 cl->host);
  return(FALSE);
}

void doNothingWithClient(rfbClientPtr cl)
{
}

enum rfbNewClientAction defaultNewClientHook(rfbClientPtr cl)
{
	return RFB_CLIENT_ACCEPT;
}

rfbScreenInfoPtr rfbGetScreen(int* argc,char** argv,
 int width,int height,int bitsPerSample,int samplesPerPixel,
 int bytesPerPixel)
{
   rfbScreenInfoPtr rfbScreen=malloc(sizeof(rfbScreenInfo));
   rfbPixelFormat* format=&rfbScreen->rfbServerFormat;

   INIT_MUTEX(logMutex);

   if(width&3)
     fprintf(stderr,"WARNING: Width (%d) is not a multiple of 4. VncViewer has problems with that.\n",width);

   rfbScreen->autoPort=FALSE;
   rfbScreen->rfbClientHead=0;
   rfbScreen->rfbPort=5900;
   rfbScreen->socketInitDone=FALSE;

   rfbScreen->inetdInitDone = FALSE;
   rfbScreen->inetdSock=-1;

   rfbScreen->udpSock=-1;
   rfbScreen->udpSockConnected=FALSE;
   rfbScreen->udpPort=0;
   rfbScreen->udpClient=0;

   rfbScreen->maxFd=0;
   rfbScreen->rfbListenSock=-1;

   rfbScreen->httpInitDone=FALSE;
   rfbScreen->httpPort=0;
   rfbScreen->httpDir=NULL;
   rfbScreen->httpListenSock=-1;
   rfbScreen->httpSock=-1;
   rfbScreen->httpFP=NULL;

   rfbScreen->desktopName = "LibVNCServer";
   rfbScreen->rfbAlwaysShared = FALSE;
   rfbScreen->rfbNeverShared = FALSE;
   rfbScreen->rfbDontDisconnect = FALSE;
   rfbScreen->rfbAuthPasswdData = 0;
   
   rfbScreen->width = width;
   rfbScreen->height = height;
   rfbScreen->bitsPerPixel = rfbScreen->depth = 8*bytesPerPixel;

   rfbScreen->passwordCheck = defaultPasswordCheck;

   rfbProcessArguments(rfbScreen,argc,argv);

#ifdef WIN32
   {
	   DWORD dummy=255;
	   GetComputerName(rfbScreen->rfbThisHost,&dummy);
   }
#else
   gethostname(rfbScreen->rfbThisHost, 255);
#endif

   rfbScreen->paddedWidthInBytes = width*bytesPerPixel;

   /* format */

   format->bitsPerPixel = rfbScreen->bitsPerPixel;
   format->depth = rfbScreen->depth;
   format->bigEndian = rfbEndianTest?FALSE:TRUE;
   format->trueColour = TRUE;
   rfbScreen->colourMap.count = 0;
   rfbScreen->colourMap.is16 = 0;
   rfbScreen->colourMap.data.bytes = NULL;

   if(bytesPerPixel == 1) {
     format->redMax = 7;
     format->greenMax = 7;
     format->blueMax = 3;
     format->redShift = 0;
     format->greenShift = 3;
     format->blueShift = 6;
   } else {
     format->redMax = (1 << bitsPerSample) - 1;
     format->greenMax = (1 << bitsPerSample) - 1;
     format->blueMax = (1 << bitsPerSample) - 1;
     if(rfbEndianTest) {
       format->redShift = 0;
       format->greenShift = bitsPerSample;
       format->blueShift = bitsPerSample * 2;
     } else {
       if(bytesPerPixel==3) {
	 format->redShift = bitsPerSample*2;
	 format->greenShift = bitsPerSample*1;
	 format->blueShift = 0;
       } else {
	 format->redShift = bitsPerSample*3;
	 format->greenShift = bitsPerSample*2;
	 format->blueShift = bitsPerSample;
       }
     }
   }

   /* cursor */

   rfbScreen->cursorIsDrawn = FALSE;
   rfbScreen->dontSendFramebufferUpdate = FALSE;
   rfbScreen->cursorX=rfbScreen->cursorY=rfbScreen->underCursorBufferLen=0;
   rfbScreen->underCursorBuffer=NULL;
   rfbScreen->dontConvertRichCursorToXCursor = FALSE;
   rfbScreen->cursor = &myCursor;
   INIT_MUTEX(rfbScreen->cursorMutex);

   IF_PTHREADS(rfbScreen->backgroundLoop = FALSE);

   rfbScreen->rfbDeferUpdateTime=5;

   /* proc's and hook's */

   rfbScreen->kbdAddEvent = defaultKbdAddEvent;
   rfbScreen->kbdReleaseAllKeys = doNothingWithClient;
   rfbScreen->ptrAddEvent = defaultPtrAddEvent;
   rfbScreen->setXCutText = defaultSetXCutText;
   rfbScreen->getCursorPtr = defaultGetCursorPtr;
   rfbScreen->setTranslateFunction = rfbSetTranslateFunction;
   rfbScreen->newClientHook = defaultNewClientHook;
   rfbScreen->displayHook = 0;

   /* initialize client list and iterator mutex */
   rfbClientListInit(rfbScreen);

   return(rfbScreen);
}

void rfbScreenCleanup(rfbScreenInfoPtr rfbScreen)
{
  rfbClientIteratorPtr i=rfbGetClientIterator(rfbScreen);
  rfbClientPtr cl,cl1=rfbClientIteratorNext(i);
  while(cl1) {
    cl=rfbClientIteratorNext(i);
    rfbClientConnectionGone(cl1);
    cl1=cl;
  }
  rfbReleaseClientIterator(i);
    
  /* TODO: hang up on all clients and free all reserved memory */
#define FREE_IF(x) if(rfbScreen->x) free(rfbScreen->x)
  FREE_IF(colourMap.data.bytes);
  FREE_IF(underCursorBuffer);
  TINI_MUTEX(rfbScreen->cursorMutex);
  free(rfbScreen);
}

void rfbInitServer(rfbScreenInfoPtr rfbScreen)
{
#ifdef WIN32
  WSADATA trash;
  int i=WSAStartup(MAKEWORD(2,2),&trash);
#endif
  rfbInitSockets(rfbScreen);
  httpInitSockets(rfbScreen);
}

#ifdef WIN32
#include <fcntl.h>
#include <conio.h>
#include <sys/timeb.h>

void gettimeofday(struct timeval* tv,char* dummy)
{
   SYSTEMTIME t;
   GetSystemTime(&t);
   tv->tv_sec=t.wHour*3600+t.wMinute*60+t.wSecond;
   tv->tv_usec=t.wMilliseconds*1000;
}
#endif

void
rfbProcessEvents(rfbScreenInfoPtr rfbScreen,long usec)
{
  rfbClientIteratorPtr i;
  rfbClientPtr cl,clPrev;
  struct timeval tv;

  if(usec<0)
    usec=rfbScreen->rfbDeferUpdateTime*1000;

  rfbCheckFds(rfbScreen,usec);
  httpCheckFds(rfbScreen);
#ifdef CORBA
  corbaCheckFds(rfbScreen);
#endif

  i = rfbGetClientIterator(rfbScreen);
  cl=rfbClientIteratorNext(i);
  while(cl) {
    if(cl->sock>=0 && (!cl->onHold) && FB_UPDATE_PENDING(cl)) {
      if(cl->screen->rfbDeferUpdateTime == 0) {
	  rfbSendFramebufferUpdate(cl,cl->modifiedRegion);
      } else if(cl->startDeferring.tv_usec == 0) {
	gettimeofday(&cl->startDeferring,NULL);
	if(cl->startDeferring.tv_usec == 0)
	  cl->startDeferring.tv_usec++;
      } else {
	gettimeofday(&tv,NULL);
	if(tv.tv_sec < cl->startDeferring.tv_sec /* at midnight */
	   || ((tv.tv_sec-cl->startDeferring.tv_sec)*1000
	       +(tv.tv_usec-cl->startDeferring.tv_usec)/1000)
	     > cl->screen->rfbDeferUpdateTime) {
	  cl->startDeferring.tv_usec = 0;
	  rfbSendFramebufferUpdate(cl,cl->modifiedRegion);
	}
      }
    }
    clPrev=cl;
    cl=rfbClientIteratorNext(i);
    if(clPrev->sock==-1)
      rfbClientConnectionGone(clPrev);
  }
  rfbReleaseClientIterator(i);
}

void rfbRunEventLoop(rfbScreenInfoPtr rfbScreen, long usec, Bool runInBackground)
{
  if(runInBackground) {
#ifdef HAVE_PTHREADS
       pthread_t listener_thread;

       rfbScreen->backgroundLoop = TRUE;

       pthread_create(&listener_thread, NULL, listenerRun, rfbScreen);
    return;
#else
    fprintf(stderr,"Can't run in background, because I don't have PThreads!\n");
    exit(-1);
#endif
  }

  if(usec<0)
    usec=rfbScreen->rfbDeferUpdateTime*1000;

  while(1)
    rfbProcessEvents(rfbScreen,usec);
}