summaryrefslogtreecommitdiffstats
path: root/mac/tclMacChan.c
blob: fc53f42fbc240e63f180d9528f11d3f3f89f8e24 (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
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
/* 
 * tclMacChan.c
 *
 *	Channel drivers for Macintosh channels for the
 *	console fds.
 *
 * Copyright (c) 1996-1997 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: tclMacChan.c,v 1.5 1999/04/15 22:38:46 stanton Exp $
 */

#include "tclInt.h"
#include "tclPort.h"
#include "tclMacInt.h"
#include <Aliases.h>
#include <Errors.h>
#include <Files.h>
#include <Gestalt.h>
#include <Processes.h>
#include <Strings.h>
#include <FSpCompat.h>
#include <MoreFiles.h>
#include <MoreFilesExtras.h>

/*
 * The following variable is used to tell whether this module has been
 * initialized.
 */

static int initialized = 0;

/*
 * The following are flags returned by GetOpenMode.  They
 * are or'd together to determine how opening and handling
 * a file should occur.
 */

#define TCL_RDONLY		(1<<0)
#define TCL_WRONLY		(1<<1)
#define TCL_RDWR		(1<<2)
#define TCL_CREAT		(1<<3)
#define TCL_TRUNC		(1<<4)
#define TCL_APPEND		(1<<5)
#define TCL_ALWAYS_APPEND	(1<<6)
#define TCL_EXCL		(1<<7)
#define TCL_NOCTTY		(1<<8)
#define TCL_NONBLOCK		(1<<9)
#define TCL_RW_MODES 		(TCL_RDONLY|TCL_WRONLY|TCL_RDWR)

/*
 * This structure describes per-instance state of a 
 * macintosh file based channel.
 */

typedef struct FileState {
    short fileRef;		/* Macintosh file reference number. */
    Tcl_Channel fileChan;	/* Pointer to the channel for this file. */
    int watchMask;		/* OR'ed set of flags indicating which events
    				 * are being watched. */
    int appendMode;		/* Flag to tell if in O_APPEND mode or not. */
    int volumeRef;		/* Flag to tell if in O_APPEND mode or not. */
    int pending;		/* 1 if message is pending on queue. */
    struct FileState *nextPtr;	/* Pointer to next registered file. */
} FileState;

/*
 * The following pointer refers to the head of the list of files managed
 * that are being watched for file events.
 */

static FileState *firstFilePtr;

/*
 * The following structure is what is added to the Tcl event queue when
 * file events are generated.
 */

typedef struct FileEvent {
    Tcl_Event header;		/* Information that is standard for
				 * all events. */
    FileState *infoPtr;		/* Pointer to file info structure.  Note
				 * that we still have to verify that the
				 * file exists before dereferencing this
				 * pointer. */
} FileEvent;

/*
 * This is defined in tclMacSerial.c.
 */

EXTERN Tcl_Channel TclMacOpenSerialChannel _ANSI_ARGS_((Tcl_Interp *interp,
	char *fileName, int *errorCode));

/*
 * Static routines for this file:
 */

static int		CommonGetHandle _ANSI_ARGS_((ClientData instanceData,
		            int direction, ClientData *handlePtr));
static void		CommonWatch _ANSI_ARGS_((ClientData instanceData,
		            int mask));
static int		FileBlockMode _ANSI_ARGS_((ClientData instanceData,
			    int mode));
static void		FileChannelExitHandler _ANSI_ARGS_((
		            ClientData clientData));
static void		FileCheckProc _ANSI_ARGS_((ClientData clientData,
			    int flags));
static int		FileClose _ANSI_ARGS_((ClientData instanceData,
			    Tcl_Interp *interp));
static int		FileEventProc _ANSI_ARGS_((Tcl_Event *evPtr,
			    int flags));
static void		FileInit _ANSI_ARGS_((void));
static int		FileInput _ANSI_ARGS_((ClientData instanceData,
			    char *buf, int toRead, int *errorCode));
static int		FileOutput _ANSI_ARGS_((ClientData instanceData,
			    char *buf, int toWrite, int *errorCode));
static int		FileSeek _ANSI_ARGS_((ClientData instanceData,
			    long offset, int mode, int *errorCode));
static void		FileSetupProc _ANSI_ARGS_((ClientData clientData,
			    int flags));
static int		GetOpenMode _ANSI_ARGS_((Tcl_Interp *interp,
        		    char *string));
static Tcl_Channel	OpenFileChannel _ANSI_ARGS_((char *fileName, int mode, 
			    int permissions, int *errorCodePtr));
static int		StdIOBlockMode _ANSI_ARGS_((ClientData instanceData,
			    int mode));
static int		StdIOClose _ANSI_ARGS_((ClientData instanceData,
			    Tcl_Interp *interp));
static int		StdIOInput _ANSI_ARGS_((ClientData instanceData,
			    char *buf, int toRead, int *errorCode));
static int		StdIOOutput _ANSI_ARGS_((ClientData instanceData,
			    char *buf, int toWrite, int *errorCode));
static int		StdIOSeek _ANSI_ARGS_((ClientData instanceData,
			    long offset, int mode, int *errorCode));
static int		StdReady _ANSI_ARGS_((ClientData instanceData,
		            int mask));

/*
 * This structure describes the channel type structure for file based IO:
 */

static Tcl_ChannelType consoleChannelType = {
    "file",			/* Type name. */
    StdIOBlockMode,		/* Set blocking/nonblocking mode.*/
    StdIOClose,			/* Close proc. */
    StdIOInput,			/* Input proc. */
    StdIOOutput,		/* Output proc. */
    StdIOSeek,			/* Seek proc. */
    NULL,			/* Set option proc. */
    NULL,			/* Get option proc. */
    CommonWatch,		/* Initialize notifier. */
    CommonGetHandle		/* Get OS handles out of channel. */
};

/*
 * This variable describes the channel type structure for file based IO.
 */

static Tcl_ChannelType fileChannelType = {
    "file",			/* Type name. */
    FileBlockMode,		/* Set blocking or
                                 * non-blocking mode.*/
    FileClose,			/* Close proc. */
    FileInput,			/* Input proc. */
    FileOutput,			/* Output proc. */
    FileSeek,			/* Seek proc. */
    NULL,			/* Set option proc. */
    NULL,			/* Get option proc. */
    CommonWatch,		/* Initialize notifier. */
    CommonGetHandle		/* Get OS handles out of channel. */
};


/*
 * Hack to allow Mac Tk to override the TclGetStdChannels function.
 */
 
typedef void (*TclGetStdChannelsProc) _ANSI_ARGS_((Tcl_Channel *stdinPtr,
	Tcl_Channel *stdoutPtr, Tcl_Channel *stderrPtr));
	
TclGetStdChannelsProc getStdChannelsProc = NULL;

/*
 * Static variables to hold channels for stdin, stdout and stderr.
 */

static Tcl_Channel stdinChannel = NULL;
static Tcl_Channel stdoutChannel = NULL;
static Tcl_Channel stderrChannel = NULL;

/*
 *----------------------------------------------------------------------
 *
 * FileInit --
 *
 *	This function initializes the file channel event source.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Creates a new event source.
 *
 *----------------------------------------------------------------------
 */

static void
FileInit()
{
    initialized = 1;
    firstFilePtr = NULL;
    Tcl_CreateEventSource(FileSetupProc, FileCheckProc, NULL);
    Tcl_CreateExitHandler(FileChannelExitHandler, NULL);
}

/*
 *----------------------------------------------------------------------
 *
 * FileChannelExitHandler --
 *
 *	This function is called to cleanup the channel driver before
 *	Tcl is unloaded.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Destroys the communication window.
 *
 *----------------------------------------------------------------------
 */

static void
FileChannelExitHandler(
    ClientData clientData)	/* Old window proc */
{
    Tcl_DeleteEventSource(FileSetupProc, FileCheckProc, NULL);
    initialized = 0;
}

/*
 *----------------------------------------------------------------------
 *
 * FileSetupProc --
 *
 *	This procedure is invoked before Tcl_DoOneEvent blocks waiting
 *	for an event.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Adjusts the block time if needed.
 *
 *----------------------------------------------------------------------
 */

void
FileSetupProc(
    ClientData data,		/* Not used. */
    int flags)			/* Event flags as passed to Tcl_DoOneEvent. */
{
    FileState *infoPtr;
    Tcl_Time blockTime = { 0, 0 };

    if (!(flags & TCL_FILE_EVENTS)) {
	return;
    }
    
    /*
     * Check to see if there is a ready file.  If so, poll.
     */

    for (infoPtr = firstFilePtr; infoPtr != NULL; infoPtr = infoPtr->nextPtr) {
	if (infoPtr->watchMask) {
	    Tcl_SetMaxBlockTime(&blockTime);
	    break;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * FileCheckProc --
 *
 *	This procedure is called by Tcl_DoOneEvent to check the file
 *	event source for events. 
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May queue an event.
 *
 *----------------------------------------------------------------------
 */

static void
FileCheckProc(
    ClientData data,		/* Not used. */
    int flags)			/* Event flags as passed to Tcl_DoOneEvent. */
{
    FileEvent *evPtr;
    FileState *infoPtr;
    int sentMsg = 0;
    Tcl_Time blockTime = { 0, 0 };

    if (!(flags & TCL_FILE_EVENTS)) {
	return;
    }
    
    /*
     * Queue events for any ready files that don't already have events
     * queued (caused by persistent states that won't generate WinSock
     * events).
     */

    for (infoPtr = firstFilePtr; infoPtr != NULL; infoPtr = infoPtr->nextPtr) {
	if (infoPtr->watchMask && !infoPtr->pending) {
	    infoPtr->pending = 1;
	    evPtr = (FileEvent *) ckalloc(sizeof(FileEvent));
	    evPtr->header.proc = FileEventProc;
	    evPtr->infoPtr = infoPtr;
	    Tcl_QueueEvent((Tcl_Event *) evPtr, TCL_QUEUE_TAIL);
	}
    }
}

/*----------------------------------------------------------------------
 *
 * FileEventProc --
 *
 *	This function is invoked by Tcl_ServiceEvent when a file event
 *	reaches the front of the event queue.  This procedure invokes
 *	Tcl_NotifyChannel on the file.
 *
 * Results:
 *	Returns 1 if the event was handled, meaning it should be removed
 *	from the queue.  Returns 0 if the event was not handled, meaning
 *	it should stay on the queue.  The only time the event isn't
 *	handled is if the TCL_FILE_EVENTS flag bit isn't set.
 *
 * Side effects:
 *	Whatever the notifier callback does.
 *
 *----------------------------------------------------------------------
 */

static int
FileEventProc(
    Tcl_Event *evPtr,		/* Event to service. */
    int flags)			/* Flags that indicate what events to
				 * handle, such as TCL_FILE_EVENTS. */
{
    FileEvent *fileEvPtr = (FileEvent *)evPtr;
    FileState *infoPtr;

    if (!(flags & TCL_FILE_EVENTS)) {
	return 0;
    }

    /*
     * Search through the list of watched files for the one whose handle
     * matches the event.  We do this rather than simply dereferencing
     * the handle in the event so that files can be deleted while the
     * event is in the queue.
     */

    for (infoPtr = firstFilePtr; infoPtr != NULL; infoPtr = infoPtr->nextPtr) {
	if (fileEvPtr->infoPtr == infoPtr) {
	    infoPtr->pending = 0;
	    Tcl_NotifyChannel(infoPtr->fileChan, infoPtr->watchMask);
	    break;
	}
    }
    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * StdIOBlockMode --
 *
 *	Set blocking or non-blocking mode on channel.
 *
 * Results:
 *	0 if successful, errno when failed.
 *
 * Side effects:
 *	Sets the device into blocking or non-blocking mode.
 *
 *----------------------------------------------------------------------
 */

static int
StdIOBlockMode(
    ClientData instanceData,		/* Unused. */
    int mode)				/* The mode to set. */
{
    /*
     * Do not allow putting stdin, stdout or stderr into nonblocking mode.
     */
    
    if (mode == TCL_MODE_NONBLOCKING) {
	return EFAULT;
    }
    
    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * StdIOClose --
 *
 *	Closes the IO channel.
 *
 * Results:
 *	0 if successful, the value of errno if failed.
 *
 * Side effects:
 *	Closes the physical channel
 *
 *----------------------------------------------------------------------
 */

static int
StdIOClose(
    ClientData instanceData,	/* Unused. */
    Tcl_Interp *interp)		/* Unused. */
{
    int fd, errorCode = 0;

    /*
     * Invalidate the stdio cache if necessary.  Note that we assume that
     * the stdio file and channel pointers will become invalid at the same
     * time.
     */

    fd = (int) ((FileState*)instanceData)->fileRef;
    if (fd == 0) {
	fd = 0;
	stdinChannel = NULL;
    } else if (fd == 1) {
	stdoutChannel = NULL;
    } else if (fd == 2) {
	stderrChannel = NULL;
    } else {
	panic("recieved invalid std file");
    }

    if (close(fd) < 0) {
	errorCode = errno;
    }

    return errorCode;
}

/*
 *----------------------------------------------------------------------
 *
 * CommonGetHandle --
 *
 *	Called from Tcl_GetChannelFile to retrieve OS handles from inside
 *	a file based channel.
 *
 * Results:
 *	The appropriate handle or NULL if not present. 
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
CommonGetHandle(
    ClientData instanceData,		/* The file state. */
    int direction,			/* Which handle to retrieve? */
    ClientData *handlePtr)
{
    if ((direction == TCL_READABLE) || (direction == TCL_WRITABLE)) {
	*handlePtr = (ClientData) ((FileState*)instanceData)->fileRef;
	return TCL_OK;
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * StdIOInput --
 *
 *	Reads input from the IO channel into the buffer given. Returns
 *	count of how many bytes were actually read, and an error indication.
 *
 * Results:
 *	A count of how many bytes were read is returned and an error
 *	indication is returned in an output argument.
 *
 * Side effects:
 *	Reads input from the actual channel.
 *
 *----------------------------------------------------------------------
 */

int
StdIOInput(
    ClientData instanceData,		/* Unused. */
    char *buf,				/* Where to store data read. */
    int bufSize,			/* How much space is available
                                         * in the buffer? */
    int *errorCode)			/* Where to store error code. */
{
    int fd;
    int bytesRead;			/* How many bytes were read? */

    *errorCode = 0;
    errno = 0;
    fd = (int) ((FileState*)instanceData)->fileRef;
    bytesRead = read(fd, buf, (size_t) bufSize);
    if (bytesRead > -1) {
        return bytesRead;
    }
    *errorCode = errno;
    return -1;
}

/*
 *----------------------------------------------------------------------
 *
 * StdIOOutput--
 *
 *	Writes the given output on the IO channel. Returns count of how
 *	many characters were actually written, and an error indication.
 *
 * Results:
 *	A count of how many characters were written is returned and an
 *	error indication is returned in an output argument.
 *
 * Side effects:
 *	Writes output on the actual channel.
 *
 *----------------------------------------------------------------------
 */

static int
StdIOOutput(
    ClientData instanceData,		/* Unused. */
    char *buf,				/* The data buffer. */
    int toWrite,			/* How many bytes to write? */
    int *errorCode)			/* Where to store error code. */
{
    int written;
    int fd;

    *errorCode = 0;
    errno = 0;
    fd = (int) ((FileState*)instanceData)->fileRef;
    written = write(fd, buf, (size_t) toWrite);
    if (written > -1) {
        return written;
    }
    *errorCode = errno;
    return -1;
}

/*
 *----------------------------------------------------------------------
 *
 * StdIOSeek --
 *
 *	Seeks on an IO channel. Returns the new position.
 *
 * Results:
 *	-1 if failed, the new position if successful. If failed, it
 *	also sets *errorCodePtr to the error code.
 *
 * Side effects:
 *	Moves the location at which the channel will be accessed in
 *	future operations.
 *
 *----------------------------------------------------------------------
 */

static int
StdIOSeek(
    ClientData instanceData,			/* Unused. */
    long offset,				/* Offset to seek to. */
    int mode,					/* Relative to where
                                                 * should we seek? */
    int *errorCodePtr)				/* To store error code. */
{
    int newLoc;
    int fd;

    *errorCodePtr = 0;
    fd = (int) ((FileState*)instanceData)->fileRef;
    newLoc = lseek(fd, offset, mode);
    if (newLoc > -1) {
        return newLoc;
    }
    *errorCodePtr = errno;
    return -1;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_PidObjCmd --
 *
 *      This procedure is invoked to process the "pid" Tcl command.
 *      See the user documentation for details on what it does.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      See the user documentation.
 *
 *----------------------------------------------------------------------
 */

        /* ARGSUSED */
int
Tcl_PidObjCmd(dummy, interp, objc, objv)
    ClientData dummy;           /* Not used. */
    Tcl_Interp *interp;         /* Current interpreter. */
    int objc;                   /* Number of arguments. */
    Tcl_Obj *CONST *objv;       /* Argument strings. */
{
    ProcessSerialNumber psn;
    char buf[20]; 
    Tcl_Channel chan;
    Tcl_Obj *resultPtr;

    if (objc > 2) {
        Tcl_WrongNumArgs(interp, 1, objv, "?channelId?");
        return TCL_ERROR;
    }
    if (objc == 1) {
        resultPtr = Tcl_GetObjResult(interp);
	GetCurrentProcess(&psn);
	sprintf(buf, "0x%08x%08x", psn.highLongOfPSN, psn.lowLongOfPSN);
        Tcl_SetStringObj(resultPtr, buf, -1);
    } else {
        chan = Tcl_GetChannel(interp, Tcl_GetStringFromObj(objv[1], NULL),
                NULL);
        if (chan == (Tcl_Channel) NULL) {
            return TCL_ERROR;
        } 
	/*
	 * We can't create pipelines on the Mac so
	 * this will always return an empty list.
	 */
    }
    
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclGetDefaultStdChannel --
 *
 *	Constructs a channel for the specified standard OS handle.
 *
 * Results:
 *	Returns the specified default standard channel, or NULL.
 *
 * Side effects:
 *	May cause the creation of a standard channel and the underlying
 *	file.
 *
 *----------------------------------------------------------------------
 */

Tcl_Channel
TclGetDefaultStdChannel(
    int type)			/* One of TCL_STDIN, TCL_STDOUT, TCL_STDERR. */
{
    Tcl_Channel channel = NULL;
    int fd = 0;			/* Initializations needed to prevent */
    int mode = 0;		/* compiler warning (used before set). */
    char *bufMode = NULL;
    char channelName[20];
    int channelPermissions;
    FileState *fileState;

    /*
     * If the channels were not created yet, create them now and
     * store them in the static variables.
     */

    switch (type) {
	case TCL_STDIN:
	    fd = 0;
	    channelPermissions = TCL_READABLE;
	    bufMode = "line";
	    break;
	case TCL_STDOUT:
	    fd = 1;
	    channelPermissions = TCL_WRITABLE;
	    bufMode = "line";
	    break;
	case TCL_STDERR:
	    fd = 2;
	    channelPermissions = TCL_WRITABLE;
	    bufMode = "none";
	    break;
	default:
	    panic("TclGetDefaultStdChannel: Unexpected channel type");
	    break;
    }

    sprintf(channelName, "console%d", (int) fd);
    fileState = (FileState *) ckalloc((unsigned) sizeof(FileState));
    channel = Tcl_CreateChannel(&consoleChannelType, channelName,
	    (ClientData) fileState, channelPermissions);
    fileState->fileChan = channel;
    fileState->fileRef = fd;

    /*
     * Set up the normal channel options for stdio handles.
     */

    Tcl_SetChannelOption(NULL, channel, "-translation", "cr");
    Tcl_SetChannelOption(NULL, channel, "-buffering", bufMode);
    
    return channel;
}

/*
 *----------------------------------------------------------------------
 *
 * TclpOpenFileChannel --
 *
 *	Open an File based channel on Unix systems.
 *
 * Results:
 *	The new channel or NULL. If NULL, the output argument
 *	errorCodePtr is set to a POSIX error.
 *
 * Side effects:
 *	May open the channel and may cause creation of a file on the
 *	file system.
 *
 *----------------------------------------------------------------------
 */

Tcl_Channel
TclpOpenFileChannel(
    Tcl_Interp *interp,			/* Interpreter for error reporting;
                                         * can be NULL. */
    char *fileName,			/* Name of file to open. */
    char *modeString,			/* A list of POSIX open modes or
                                         * a string such as "rw". */
    int permissions)			/* If the open involves creating a
                                         * file, with what modes to create
                                         * it? */
{
    Tcl_Channel chan;
    int mode;
    char *nativeName;
    Tcl_DString buffer;
    int errorCode, port = 0;
    
    mode = GetOpenMode(interp, modeString);
    if (mode == -1) {
	return NULL;
    }

    /* 
     * Look for the magic cookies that refer to the modem ports.
     */
    
    nativeName = Tcl_TranslateFileName(interp, fileName, &buffer);
    if (nativeName == NULL) {
	return NULL;
    }

    chan = OpenFileChannel(nativeName, mode, permissions, &errorCode);
    Tcl_DStringFree(&buffer);
    
    if (chan == NULL) {
	Tcl_SetErrno(errorCode);
	if (interp != (Tcl_Interp *) NULL) {
            Tcl_AppendResult(interp, "couldn't open \"", fileName, "\": ",
                    Tcl_PosixError(interp), (char *) NULL);
        }
	return NULL;
    }
    
    return chan;
}

/*
 *----------------------------------------------------------------------
 *
 * OpenFileChannel--
 *
 *	Opens a Macintosh file and creates a Tcl channel to control it.
 *
 * Results:
 *	A Tcl channel.
 *
 * Side effects:
 *	Will open a Macintosh file.
 *
 *----------------------------------------------------------------------
 */

static Tcl_Channel
OpenFileChannel(
    char *fileName,			/* Name of file to open. */
    int mode,				/* Mode for opening file. */
    int permissions,			/* If the open involves creating a
                                         * file, with what modes to create
                                         * it? */
    int *errorCodePtr)			/* Where to store error code. */
{
    int channelPermissions;
    Tcl_Channel chan;
    char macPermision;
    FSSpec fileSpec;
    OSErr err;
    short fileRef;
    FileState *fileState;
    char channelName[64];
    
    /*
     * Note we use fsRdWrShPerm instead of fsRdWrPerm which allows shared
     * writes on a file.  This isn't common on a mac but is common with 
     * Windows and UNIX and the feature is used by Tcl.
     */

    switch (mode & (TCL_RDONLY | TCL_WRONLY | TCL_RDWR)) {
	case TCL_RDWR:
	    channelPermissions = (TCL_READABLE | TCL_WRITABLE);
	    macPermision = fsRdWrShPerm;
	    break;
	case TCL_WRONLY:
	    /*
	     * Mac's fsRdPerm permission actually defaults to fsRdWrPerm because
	     * the Mac OS doesn't realy support write only access.  We explicitly
	     * set the permission fsRdWrShPerm so that we can have shared write
	     * access.
	     */
	    channelPermissions = TCL_WRITABLE;
	    macPermision = fsRdWrShPerm;
	    break;
	case TCL_RDONLY:
	default:
	    channelPermissions = TCL_READABLE;
	    macPermision = fsRdPerm;
	    break;
    }
     
    err = FSpLocationFromPath(strlen(fileName), fileName, &fileSpec);
    if ((err != noErr) && (err != fnfErr)) {
	*errorCodePtr = errno = TclMacOSErrorToPosixError(err);
	Tcl_SetErrno(errno);
	return NULL;
    }

    if ((err == fnfErr) && (mode & TCL_CREAT)) {
	err = HCreate(fileSpec.vRefNum, fileSpec.parID, fileSpec.name, 'MPW ', 'TEXT');
	if (err != noErr) {
	    *errorCodePtr = errno = TclMacOSErrorToPosixError(err);
	    Tcl_SetErrno(errno);
	    return NULL;
	}
    } else if ((mode & TCL_CREAT) && (mode & TCL_EXCL)) {
        *errorCodePtr = errno = EEXIST;
	Tcl_SetErrno(errno);
        return NULL;
    }

    err = HOpenDF(fileSpec.vRefNum, fileSpec.parID, fileSpec.name, macPermision, &fileRef);
    if (err != noErr) {
	*errorCodePtr = errno = TclMacOSErrorToPosixError(err);
	Tcl_SetErrno(errno);
	return NULL;
    }

    if (mode & TCL_TRUNC) {
	SetEOF(fileRef, 0);
    }
    
    sprintf(channelName, "file%d", (int) fileRef);
    fileState = (FileState *) ckalloc((unsigned) sizeof(FileState));
    chan = Tcl_CreateChannel(&fileChannelType, channelName, 
	(ClientData) fileState, channelPermissions);
    if (chan == (Tcl_Channel) NULL) {
	*errorCodePtr = errno = EFAULT;
	Tcl_SetErrno(errno);
	FSClose(fileRef);
	ckfree((char *) fileState);
        return NULL;
    }

    fileState->fileChan = chan;
    fileState->volumeRef = fileSpec.vRefNum;
    fileState->fileRef = fileRef;
    fileState->pending = 0;
    fileState->watchMask = 0;
    if (mode & TCL_ALWAYS_APPEND) {
	fileState->appendMode = true;
    } else {
	fileState->appendMode = false;
    }
        
    if ((mode & TCL_ALWAYS_APPEND) || (mode & TCL_APPEND)) {
        if (Tcl_Seek(chan, 0, SEEK_END) < 0) {
	    *errorCodePtr = errno = EFAULT;
	    Tcl_SetErrno(errno);
            Tcl_Close(NULL, chan);
            FSClose(fileRef);
            ckfree((char *) fileState);
            return NULL;
        }
    }
    
    return chan;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_MakeFileChannel --
 *
 *	Makes a Tcl_Channel from an existing OS level file handle.
 *
 * Results:
 *	The Tcl_Channel created around the preexisting OS level file handle.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

Tcl_Channel
Tcl_MakeFileChannel(handle, mode)
    ClientData handle;		/* OS level handle. */
    int mode;			/* ORed combination of TCL_READABLE and
                                 * TCL_WRITABLE to indicate file mode. */
{
    /*
     * Not implemented yet.
     */

    return NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * FileBlockMode --
 *
 *	Set blocking or non-blocking mode on channel.  Macintosh files
 *	can never really be set to blocking or non-blocking modes.
 *	However, we don't generate an error - we just return success.
 *
 * Results:
 *	0 if successful, errno when failed.
 *
 * Side effects:
 *	Sets the device into blocking or non-blocking mode.
 *
 *----------------------------------------------------------------------
 */

static int
FileBlockMode(
    ClientData instanceData,		/* Unused. */
    int mode)				/* The mode to set. */
{
    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * FileClose --
 *
 *	Closes the IO channel.
 *
 * Results:
 *	0 if successful, the value of errno if failed.
 *
 * Side effects:
 *	Closes the physical channel
 *
 *----------------------------------------------------------------------
 */

static int
FileClose(
    ClientData instanceData,	/* Unused. */
    Tcl_Interp *interp)		/* Unused. */
{
    FileState *fileState = (FileState *) instanceData;
    int errorCode = 0;
    OSErr err;

    err = FSClose(fileState->fileRef);
    FlushVol(NULL, fileState->volumeRef);
    if (err != noErr) {
	errorCode = errno = TclMacOSErrorToPosixError(err);
	panic("error during file close");
    }

    ckfree((char *) fileState);
    Tcl_SetErrno(errorCode);
    return errorCode;
}

/*
 *----------------------------------------------------------------------
 *
 * FileInput --
 *
 *	Reads input from the IO channel into the buffer given. Returns
 *	count of how many bytes were actually read, and an error indication.
 *
 * Results:
 *	A count of how many bytes were read is returned and an error
 *	indication is returned in an output argument.
 *
 * Side effects:
 *	Reads input from the actual channel.
 *
 *----------------------------------------------------------------------
 */

int
FileInput(
    ClientData instanceData,	/* Unused. */
    char *buffer,				/* Where to store data read. */
    int bufSize,				/* How much space is available
                                 * in the buffer? */
    int *errorCodePtr)			/* Where to store error code. */
{
    FileState *fileState = (FileState *) instanceData;
    OSErr err;
    long length = bufSize;

    *errorCodePtr = 0;
    errno = 0;
    err = FSRead(fileState->fileRef, &length, buffer);
    if ((err == noErr) || (err == eofErr)) {
	return length;
    } else {
	switch (err) {
	    case ioErr:
		*errorCodePtr = errno = EIO;
	    case afpAccessDenied:
		*errorCodePtr = errno = EACCES;
	    default:
		*errorCodePtr = errno = EINVAL;
	}
        return -1;	
    }
    *errorCodePtr = errno;
    return -1;
}

/*
 *----------------------------------------------------------------------
 *
 * FileOutput--
 *
 *	Writes the given output on the IO channel. Returns count of how
 *	many characters were actually written, and an error indication.
 *
 * Results:
 *	A count of how many characters were written is returned and an
 *	error indication is returned in an output argument.
 *
 * Side effects:
 *	Writes output on the actual channel.
 *
 *----------------------------------------------------------------------
 */

static int
FileOutput(
    ClientData instanceData,		/* Unused. */
    char *buffer,			/* The data buffer. */
    int toWrite,			/* How many bytes to write? */
    int *errorCodePtr)			/* Where to store error code. */
{
    FileState *fileState = (FileState *) instanceData;
    long length = toWrite;
    OSErr err;

    *errorCodePtr = 0;
    errno = 0;
    
    if (fileState->appendMode == true) {
	FileSeek(instanceData, 0, SEEK_END, errorCodePtr);
	*errorCodePtr = 0;
    }
    
    err = FSWrite(fileState->fileRef, &length, buffer);
    if (err == noErr) {
	err = FlushFile(fileState->fileRef);
    } else {
	*errorCodePtr = errno = TclMacOSErrorToPosixError(err);
	return -1;
    }
    return length;
}

/*
 *----------------------------------------------------------------------
 *
 * FileSeek --
 *
 *	Seeks on an IO channel. Returns the new position.
 *
 * Results:
 *	-1 if failed, the new position if successful. If failed, it
 *	also sets *errorCodePtr to the error code.
 *
 * Side effects:
 *	Moves the location at which the channel will be accessed in
 *	future operations.
 *
 *----------------------------------------------------------------------
 */

static int
FileSeek(
    ClientData instanceData,	/* Unused. */
    long offset,				/* Offset to seek to. */
    int mode,					/* Relative to where
                                 * should we seek? */
    int *errorCodePtr)			/* To store error code. */
{
    FileState *fileState = (FileState *) instanceData;
    IOParam pb;
    OSErr err;

    *errorCodePtr = 0;
    pb.ioCompletion = NULL;
    pb.ioRefNum = fileState->fileRef;
    if (mode == SEEK_SET) {
	pb.ioPosMode = fsFromStart;
    } else if (mode == SEEK_END) {
	pb.ioPosMode = fsFromLEOF;
    } else if (mode == SEEK_CUR) {
	err = PBGetFPosSync((ParmBlkPtr) &pb);
	if (pb.ioResult == noErr) {
	    if (offset == 0) {
		return pb.ioPosOffset;
	    }
	    offset += pb.ioPosOffset;
	}
	pb.ioPosMode = fsFromStart;
    }
    pb.ioPosOffset = offset;
    err = PBSetFPosSync((ParmBlkPtr) &pb);
    if (pb.ioResult == noErr){
	return pb.ioPosOffset;
    } else if (pb.ioResult == eofErr) {
	long currentEOF, newEOF;
	long buffer, i, length;
	
	err = PBGetEOFSync((ParmBlkPtr) &pb);
	currentEOF = (long) pb.ioMisc;
	if (mode == SEEK_SET) {
	    newEOF = offset;
	} else if (mode == SEEK_END) {
	    newEOF = offset + currentEOF;
	} else if (mode == SEEK_CUR) {
	    err = PBGetFPosSync((ParmBlkPtr) &pb);
	    newEOF = offset + pb.ioPosOffset;
	}
	
	/*
	 * Write 0's to the new EOF.
	 */
	pb.ioPosOffset = 0;
	pb.ioPosMode = fsFromLEOF;
	err = PBGetFPosSync((ParmBlkPtr) &pb);
	length = 1;
	buffer = 0;
	for (i = 0; i < (newEOF - currentEOF); i++) {
	    err = FSWrite(fileState->fileRef, &length, &buffer);
	}
	err = PBGetFPosSync((ParmBlkPtr) &pb);
	if (pb.ioResult == noErr){
	    return pb.ioPosOffset;
	}
    }
    *errorCodePtr = errno = TclMacOSErrorToPosixError(err);
    return -1;
}

/*
 *----------------------------------------------------------------------
 *
 * CommonWatch --
 *
 *	Initialize the notifier to watch handles from this channel.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static void
CommonWatch(
    ClientData instanceData,		/* The file state. */
    int mask)				/* Events of interest; an OR-ed
                                         * combination of TCL_READABLE,
                                         * TCL_WRITABLE and TCL_EXCEPTION. */
{
    FileState **nextPtrPtr, *ptr;
    FileState *infoPtr = (FileState *) instanceData;
    int oldMask = infoPtr->watchMask;

    if (!initialized) {
	FileInit();
    }

    infoPtr->watchMask = mask;
    if (infoPtr->watchMask) {
	if (!oldMask) {
	    infoPtr->nextPtr = firstFilePtr;
	    firstFilePtr = infoPtr;
	}
    } else {
	if (oldMask) {
	    /*
	     * Remove the file from the list of watched files.
	     */

	    for (nextPtrPtr = &firstFilePtr, ptr = *nextPtrPtr;
		 ptr != NULL;
		 nextPtrPtr = &ptr->nextPtr, ptr = *nextPtrPtr) {
		if (infoPtr == ptr) {
		    *nextPtrPtr = ptr->nextPtr;
		    break;
		}
	    }
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * GetOpenMode --
 *
 * Description:
 *	Computes a POSIX mode mask from a given string and also sets
 *	a flag to indicate whether the caller should seek to EOF during
 *	opening of the file.
 *
 * Results:
 *	On success, returns mode to pass to "open". If an error occurs, the
 *	returns -1 and if interp is not NULL, sets interp->result to an
 *	error message.
 *
 * Side effects:
 *	Sets the integer referenced by seekFlagPtr to 1 if the caller
 *	should seek to EOF during opening the file.
 *
 * Special note:
 *	This code is based on a prototype implementation contributed
 *	by Mark Diekhans.
 *
 *----------------------------------------------------------------------
 */

static int
GetOpenMode(
    Tcl_Interp *interp,			/* Interpreter to use for error
					 * reporting - may be NULL. */
    char *string)			/* Mode string, e.g. "r+" or
					 * "RDONLY CREAT". */
{
    int mode, modeArgc, c, i, gotRW;
    char **modeArgv, *flag;

    /*
     * Check for the simpler fopen-like access modes (e.g. "r").  They
     * are distinguished from the POSIX access modes by the presence
     * of a lower-case first letter.
     */

    mode = 0;
    if (islower(UCHAR(string[0]))) {
	switch (string[0]) {
	    case 'r':
		mode = TCL_RDONLY;
		break;
	    case 'w':
		mode = TCL_WRONLY|TCL_CREAT|TCL_TRUNC;
		break;
	    case 'a':
		mode = TCL_WRONLY|TCL_CREAT|TCL_APPEND;
		break;
	    default:
		error:
                if (interp != (Tcl_Interp *) NULL) {
                    Tcl_AppendResult(interp,
                            "illegal access mode \"", string, "\"",
                            (char *) NULL);
                }
		return -1;
	}
	if (string[1] == '+') {
	    mode &= ~(TCL_RDONLY|TCL_WRONLY);
	    mode |= TCL_RDWR;
	    if (string[2] != 0) {
		goto error;
	    }
	} else if (string[1] != 0) {
	    goto error;
	}
        return mode;
    }

    /*
     * The access modes are specified using a list of POSIX modes
     * such as TCL_CREAT.
     */

    if (Tcl_SplitList(interp, string, &modeArgc, &modeArgv) != TCL_OK) {
        if (interp != (Tcl_Interp *) NULL) {
            Tcl_AddErrorInfo(interp,
                    "\n    while processing open access modes \"");
            Tcl_AddErrorInfo(interp, string);
            Tcl_AddErrorInfo(interp, "\"");
        }
        return -1;
    }
    
    gotRW = 0;
    for (i = 0; i < modeArgc; i++) {
	flag = modeArgv[i];
	c = flag[0];
	if ((c == 'R') && (strcmp(flag, "RDONLY") == 0)) {
	    mode = (mode & ~TCL_RW_MODES) | TCL_RDONLY;
	    gotRW = 1;
	} else if ((c == 'W') && (strcmp(flag, "WRONLY") == 0)) {
	    mode = (mode & ~TCL_RW_MODES) | TCL_WRONLY;
	    gotRW = 1;
	} else if ((c == 'R') && (strcmp(flag, "RDWR") == 0)) {
	    mode = (mode & ~TCL_RW_MODES) | TCL_RDWR;
	    gotRW = 1;
	} else if ((c == 'A') && (strcmp(flag, "APPEND") == 0)) {
	    mode |= TCL_ALWAYS_APPEND;
	} else if ((c == 'C') && (strcmp(flag, "CREAT") == 0)) {
	    mode |= TCL_CREAT;
	} else if ((c == 'E') && (strcmp(flag, "EXCL") == 0)) {
	    mode |= TCL_EXCL;
	} else if ((c == 'N') && (strcmp(flag, "NOCTTY") == 0)) {
	    mode |= TCL_NOCTTY;
	} else if ((c == 'N') && (strcmp(flag, "NONBLOCK") == 0)) {
	    mode |= TCL_NONBLOCK;
	} else if ((c == 'T') && (strcmp(flag, "TRUNC") == 0)) {
	    mode |= TCL_TRUNC;
	} else {
            if (interp != (Tcl_Interp *) NULL) {
                Tcl_AppendResult(interp, "invalid access mode \"", flag,
                        "\": must be RDONLY, WRONLY, RDWR, APPEND, CREAT",
                        " EXCL, NOCTTY, NONBLOCK, or TRUNC", (char *) NULL);
            }
	    ckfree((char *) modeArgv);
	    return -1;
	}
    }
    ckfree((char *) modeArgv);
    if (!gotRW) {
        if (interp != (Tcl_Interp *) NULL) {
            Tcl_AppendResult(interp, "access mode must include either",
                    " RDONLY, WRONLY, or RDWR", (char *) NULL);
        }
	return -1;
    }
    return mode;
}