File: tty.c

package info (click to toggle)
jupp 3.1.38-1
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 2,420 kB
  • sloc: ansic: 31,382; sh: 4,199; makefile: 431
file content (1324 lines) | stat: -rw-r--r-- 26,274 bytes parent folder | download | duplicates (3)
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
/*
 *	UNIX Tty and Process interface
 *	Copyright
 *		(C) 1992 Joseph H. Allen
 *
 *	This file is part of JOE (Joe's Own Editor)
 */
#include "config.h"
#include "types.h"

__RCSID("$MirOS: contrib/code/jupp/tty.c,v 1.38 2018/11/11 18:20:51 tg Exp $");

#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <fcntl.h>

#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

#if HAVE_UTMP_H
#include <utmp.h>
#endif

int idleout = 1;

/* We use the defines in sys/ioctl to determine what type
 * tty interface the system uses and what type of system
 * we actually have.
 */
#if defined(HAVE_POSIX_TERMIOS)
#include <termios.h>
#elif defined(HAVE_SYSV_TERMIO)
#include <termio.h>
#include <sys/termio.h>
#elif defined(HAVE_SGTTY_H)
#include <sgtty.h>
#endif

#ifdef HAVE_OPENPTY
#ifdef HAVE_PTY_H
#include <pty.h>
#endif
#ifdef HAVE_UTIL_H
#include <util.h>
#endif
#endif

/* Straight from the GNU autoconf texinfo documentation */
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# ifdef HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif

/* I'm not sure if SCO_UNIX and ISC have __svr4__ defined, but I think
   they might */
#ifdef M_SYS5
#ifndef M_XENIX
#include <sys/stream.h>
#include <sys/ptem.h>
#ifndef __svr4__
#define __svr4__ 1
#endif
#endif
#endif

#ifdef ISC
#ifndef __svr4__
#define __svr4__ 1
#endif
#endif

#ifdef __svr4__
#include <stropts.h>
#endif

/* JOE include files */

#include "main.h"
#include "path.h"
#include "scrn.h"
#include "tty.h"
#include "utils.h"
#include "ushell.h"

/** Aliased defines **/

/* O_NDELAY, O_NONBLOCK, and FNDELAY are all synonyms for placing a descriptor
 * in non-blocking mode; we make whichever one we have look like O_NDELAY
 */
#ifndef O_NDELAY
#ifdef O_NONBLOCK
#define O_NDELAY O_NONBLOCK
#endif
#ifdef FNDELAY
#define O_NDELAY FNDELAY
#endif
#endif

/* Some systems define this, some don't */
#ifndef sigmask
#define sigmask(x) (1<<((x)-1))
#endif

/* Some BSDs don't have TILDE */
#ifndef TILDE
#define TILDE 0
#endif

/* Global configuration variables */

int noxon = 0;			/* Set if ^S/^Q processing should be disabled */
int Baud = 0;			/* Baud rate from joerc, cmd line or environment */

/* The terminal */

FILE *termin = NULL;
FILE *termout = NULL;

/* Original state of tty */

#ifdef HAVE_POSIX_TERMIOS
struct termios oldterm;
#else /* HAVE_POSIX_TERMIOS */
#ifdef HAVE_SYSV_TERMIO
static struct termio oldterm;
#else /* HAVE_SYSV_TERMIO */
static struct sgttyb oarg;
static struct tchars otarg;
static struct ltchars oltarg;
#endif /* HAVE_SYSV_TERMIO */
#endif /* HAVE_POSIX_TERMIOS */

/* Output buffer, index and size */

unsigned char *obuf = NULL;
int obufp = 0;
int obufsiz;

/* The baud rate */

unsigned baud;			/* Bits per second */
unsigned long upc;		/* Microseconds per character */

/* TTY Speed code to baud-rate conversion table (this is dumb- is it really
 * too much to ask for them to just use an integer for the baud-rate?)
 */

static int speeds[] = {
	B50, 50, B75, 75, B110, 110, B134, 134, B150, 150, B200, 200,
	B300, 300, B600, 600,
	B1200, 1200, B1800, 1800, B2400, 2400, B4800, 4800, B9600, 9600
#ifdef EXTA
	    , EXTA, 19200
#endif
#ifdef EXTB
	    , EXTB, 38400
#endif
#ifdef B19200
	    , B19200, 19200
#endif
#ifdef B38400
	    , B38400, 38400
#endif
};

/* Input buffer */

int have = 0;			/* Set if we have pending input */
static unsigned char havec;	/* Character read in during pending input check */
int leave = 0;			/* When set, typeahead checking is disabled */

/* TTY mode flag.  1 for open, 0 for closed */
static int ttymode = 0;

/* Signal state flag.  1 for joe, 0 for normal */
static int ttysig = 0;

#if WANT_FORK
/* Stuff for shell windows */

static pid_t kbdpid;		/* PID of kbd client */
static int ackkbd = -1;		/* Editor acks keyboard client to this */

static int mpxfd;		/* Editor reads packets from this fd */
static int mpxsfd;		/* Clients send packets to this fd */

static int nmpx = 0;
static int tty_accept = NO_MORE_DATA;	/* =-1 if we have last packet */

struct packet {
	MPX *who;
	int size;
	int ch;
	unsigned char data[1024];
} pack;

MPX asyncs[NPROC];
#endif

/* Set signals for JOE */
void sigjoe(void)
{
	if (ttysig)
		return;
	ttysig = 1;
	joe_set_signal(SIGHUP, ttsig);
	joe_set_signal(SIGTERM, ttsig);
	joe_set_signal(SIGINT, SIG_IGN);
	joe_set_signal(SIGPIPE, SIG_IGN);
}

/* Restore signals for exiting */
void signrm(int inchild)
{
	if (!ttysig)
		return;
	if (!inchild)
		ttysig = 0;
	joe_set_signal(SIGHUP, SIG_DFL);
	joe_set_signal(SIGTERM, SIG_DFL);
	joe_set_signal(SIGINT, SIG_DFL);
	joe_set_signal(SIGPIPE, SIG_DFL);
}

/* Open terminal and set signals */

void ttopen(void)
{
	sigjoe();
	ttopnn();
}

/* Close terminal and restore signals */

void ttclose(void)
{
	ttclsn();
	signrm(0);
}

static volatile sig_atomic_t winched = 0;
#ifdef SIGWINCH
/* Window size interrupt handler */
static RETSIGTYPE winchd(int unused)
{
	winched = 1;
	REINSTALL_SIGHANDLER(SIGWINCH, winchd);
}
#endif

/* Second ticker */

static volatile sig_atomic_t ticked = 0;
extern int dostaupd;
static RETSIGTYPE dotick(int unused)
{
	ticked = 1;
}

void tickoff(void)
{
	alarm(0);
}

void tickon(void)
{
	ticked = 0;
	joe_set_signal(SIGALRM, dotick);
	alarm(1);
}

/* Open terminal */

static void baud_reset(int);

void ttopnn(void)
{
	int bbaud;

#ifdef HAVE_POSIX_TERMIOS
	struct termios newterm;
#else
#ifdef HAVE_SYSV_TERMIO
	struct termio newterm;
#else
	struct sgttyb arg;
	struct tchars targ;
	struct ltchars ltarg;
#endif
#endif

	if (!termin) {
		if (idleout ? (!(termin = stdin) || !(termout = stdout)) : (!(termin = fopen("/dev/tty", "r")) || !(termout = fopen("/dev/tty", "w")))) {
			fprintf(stderr, "Couldn\'t open /dev/tty\n");
			exit(1);
		} else {
#ifdef SIGWINCH
			joe_set_signal(SIGWINCH, winchd);
#endif
		}
	}

	if (ttymode)
		return;
	ttymode = 1;
	fflush(termout);

#ifdef HAVE_POSIX_TERMIOS
	tcgetattr(fileno(termin), &oldterm);
	newterm = oldterm;
	newterm.c_lflag = 0;
	if (noxon)
		newterm.c_iflag &= ~(ICRNL | IGNCR | INLCR | IXON | IXOFF);
	else
		newterm.c_iflag &= ~(ICRNL | IGNCR | INLCR);
	newterm.c_oflag = 0;
	newterm.c_cc[VMIN] = 1;
	newterm.c_cc[VTIME] = 0;
	tcsetattr(fileno(termin), TCSADRAIN, &newterm);
	bbaud = cfgetospeed(&newterm);
#else
#ifdef HAVE_SYSV_TERMIO
	ioctl(fileno(termin), TCGETA, &oldterm);
	newterm = oldterm;
	newterm.c_lflag = 0;
	if (noxon)
		newterm.c_iflag &= ~(ICRNL | IGNCR | INLCR | IXON | IXOFF);
	else
		newterm.c_iflag &= ~(ICRNL | IGNCR | INLCR);
	newterm.c_oflag = 0;
	newterm.c_cc[VMIN] = 1;
	newterm.c_cc[VTIME] = 0;
	ioctl(fileno(termin), TCSETAW, &newterm);
	bbaud = (newterm.c_cflag & CBAUD);
#else
	ioctl(fileno(termin), TIOCGETP, &arg);
	ioctl(fileno(termin), TIOCGETC, &targ);
	ioctl(fileno(termin), TIOCGLTC, &ltarg);
	oarg = arg;
	otarg = targ;
	oltarg = ltarg;
	arg.sg_flags = ((arg.sg_flags & ~(ECHO | CRMOD | XTABS | ALLDELAY | TILDE)) | CBREAK);
	if (noxon) {
		targ.t_startc = -1;
		targ.t_stopc = -1;
	}
	targ.t_intrc = -1;
	targ.t_quitc = -1;
	targ.t_eofc = -1;
	targ.t_brkc = -1;
	ltarg.t_suspc = -1;
	ltarg.t_dsuspc = -1;
	ltarg.t_rprntc = -1;
	ltarg.t_flushc = -1;
	ltarg.t_werasc = -1;
	ltarg.t_lnextc = -1;
	ioctl(fileno(termin), TIOCSETN, &arg);
	ioctl(fileno(termin), TIOCSETC, &targ);
	ioctl(fileno(termin), TIOCSLTC, &ltarg);
	bbaud = arg.sg_ospeed;
#endif
#endif
	baud_reset(bbaud);
}

static void
baud_reset(int bbaud)
{
	size_t x = 0;

	baud = 9600;
	upc = 0;
	while (x < NELEM(speeds))
		if (bbaud == speeds[x]) {
			baud = speeds[x + 1];
			break;
		} else
			x += 2;
	if (Baud >= 50)
		baud = Baud;
	else
		Baud = baud;
	upc = DIVIDEND / baud;
	if (obuf)
		free(obuf);
	if ((TIMES * upc) == 0)
		obufsiz = 4096;
	else {
		obufsiz = 1000000 / (TIMES * upc);
		if (obufsiz > 4096)
			obufsiz = 4096;
	}
	if (!obufsiz)
		obufsiz = 1;
	obuf = malloc(obufsiz);
}

/* Close terminal */

void ttclsn(void)
{
	int oleave;

	if (ttymode)
		ttymode = 0;
	else
		return;

	oleave = leave;
	leave = 1;

	ttflsh();

#ifdef HAVE_POSIX_TERMIOS
	tcsetattr(fileno(termin), TCSADRAIN, &oldterm);
#else
#ifdef HAVE_SYSV_TERMIO
	ioctl(fileno(termin), TCSETAW, &oldterm);
#else
	ioctl(fileno(termin), TIOCSETN, &oarg);
	ioctl(fileno(termin), TIOCSETC, &otarg);
	ioctl(fileno(termin), TIOCSLTC, &oltarg);
#endif
#endif

	leave = oleave;
}

/* Timer interrupt handler */

static volatile sig_atomic_t yep;
static RETSIGTYPE dosig(int unused)
{
	yep = 1;
}

/* FLush output and check for typeahead */

#ifdef HAVE_SETITIMER
#ifdef SIG_SETMASK
static void maskit(void)
{
	sigset_t set;

	sigemptyset(&set);
	sigaddset(&set, SIGALRM);
	sigprocmask(SIG_SETMASK, &set, NULL);
}

static void unmaskit(void)
{
	sigset_t set;

	sigemptyset(&set);
	sigprocmask(SIG_SETMASK, &set, NULL);
}

static void pauseit(void)
{
	sigset_t set;

	sigemptyset(&set);
	sigsuspend(&set);
}

#else
static void maskit(void)
{
	sigsetmask(sigmask(SIGALRM));
}

static void unmaskit(void)
{
	sigsetmask(0);
}

static void pauseit(void)
{
	sigpause(0);
}

#endif
#endif

int ttflsh(void)
{
	/* Flush output */
	if (obufp) {
		unsigned long usec = obufp * upc;	/* No. usecs this write should take */

#ifdef HAVE_SETITIMER
		if (usec >= 50000 && baud < 9600) {
			struct itimerval a, b;

			a.it_value.tv_sec = usec / 1000000;
			a.it_value.tv_usec = usec % 1000000;
			a.it_interval.tv_usec = 0;
			a.it_interval.tv_sec = 0;
			alarm(0);
			joe_set_signal(SIGALRM, dosig);
			yep = 0;
			maskit();
			setitimer(ITIMER_REAL, &a, &b);
			joe_write(fileno(termout), obuf, obufp);
			while (!yep)
				pauseit();
			unmaskit();
		} else
			joe_write(fileno(termout), obuf, obufp);

#else

		joe_write(fileno(termout), obuf, obufp);

#ifdef FIORDCHK
		if (baud < 9600 && usec / 1000)
			nap(usec / 1000);
#endif

#endif

		obufp = 0;
	}

#if WANT_FORK
	/* Ack previous packet */
	if (ackkbd != -1 && tty_accept != NO_MORE_DATA && !have) {
		unsigned char c = 0;

		if (pack.who && pack.who->func)
			joe_write(pack.who->ackfd, &c, 1);
		else
			joe_write(ackkbd, &c, 1);
		tty_accept = NO_MORE_DATA;
	}
#endif

	/* Check for typeahead or next packet */

	if (!have && !leave) {
#if WANT_FORK
		if (ackkbd != -1) {
			ssize_t r;

			fcntl(mpxfd, F_SETFL, O_NDELAY);
			r = read(mpxfd, &pack, 1);
			fcntl(mpxfd, F_SETFL, 0);
			if (r == 1) {
				r = sizeof(struct packet) - 1024 - 1;
				if (joe_readex(mpxfd, (US &pack) + 1, r) == r &&
				    pack.size >= 0 && pack.size <= 1024 &&
				    joe_readex(mpxfd, pack.data,
				    pack.size) == pack.size) {
					have = 1;
					tty_accept = pack.ch;
				}
			}
		} else
#endif
		  {
			/* Set terminal input to non-blocking */
			fcntl(fileno(termin), F_SETFL, O_NDELAY);

			/* Try to read */
			if (read(fileno(termin), &havec, 1) == 1)
				have = 1;

			/* Set terminal back to blocking */
			fcntl(fileno(termin), F_SETFL, 0);
		}
	}
	return 0;
}

/* Read next character from input */

#if WANT_FORK
static void mpxdied(MPX *m);
#endif

static time_t last_time;

int ttgetc(void)
{
	time_t new_time;

	tickon();

 loop:
	new_time = time(NULL);
	if (new_time != last_time) {
		last_time = new_time;
		dostaupd = 1;
		ticked = 1;
	}
	ttflsh();
	while (winched) {
		winched = 0;
		edupd(1);
		ttflsh();
	}
	if (ticked) {
		edupd(0);
		ttflsh();
		tickon();
	}
#if WANT_FORK
	if (ackkbd != -1) {
		ssize_t r;
		if (!have) {
			/* wait for input */
			r = sizeof(struct packet) - 1024;

			if (joe_readex(mpxfd, &pack, r) != r ||
			    pack.size < 0 || pack.size > 1024 ||
			    joe_readex(mpxfd, pack.data,
			    pack.size) != pack.size) {
				if (winched || ticked)
					goto loop;
				ttsig(0);
			}
			tty_accept = pack.ch;
		}
		have = 0;
		if (pack.who) {
			/* got background input */
			if (tty_accept != NO_MORE_DATA) {
				if (pack.who->func) {
					pack.who->func(pack.who->object, pack.data, pack.size);
					edupd(1);
				}
			} else
				mpxdied(pack.who);
			goto loop;
		} else if (tty_accept != NO_MORE_DATA) {
			tickoff();
			return tty_accept;
		} else {
			tickoff();
			ttsig(0);
			return 0;
		}
	}
#endif
	if (have) {
		have = 0;
	} else if (read(fileno(termin), &havec, 1) < 1) {
		if (winched || ticked)
			goto loop;
		ttsig(0);
	}
	tickoff();
	return havec;
}

/* Write string to output */

void ttputs(unsigned char *s)
{
	while (*s) {
		obuf[obufp++] = *s++;
		if (obufp == obufsiz)
			ttflsh();
	}
}

/* Get window size */

void ttgtsz(int *x, int *y)
{
#ifdef TIOCGSIZE
	struct ttysize getit;
#else
#ifdef TIOCGWINSZ
	struct winsize getit;
#endif
#endif

	*x = 0;
	*y = 0;

#ifdef TIOCGSIZE
	if (ioctl(fileno(termout), TIOCGSIZE, &getit) != -1) {
		*x = getit.ts_cols;
		*y = getit.ts_lines;
	}
#else
#ifdef TIOCGWINSZ
	if (ioctl(fileno(termout), TIOCGWINSZ, &getit) != -1) {
		*x = getit.ws_col;
		*y = getit.ws_row;
	}
#endif
#endif
}

#ifndef SIGTSTP
/* void ttshell(char *s);  Run a shell command or if 's' is zero, run a
 * sub-shell
 */
static void ttshell(unsigned char *cmd);
static const char shmsg[] =
    "You are at the command shell.  Type 'exit' to return\n";

#if WANT_FORK
#define v_or_fork() fork()
#else
#define v_or_fork() vfork()
#endif

static void ttshell(unsigned char *cmd)
{
	int x, omode = ttymode;
	const char *sh;

	sh = getushell();
	ttclsn();
	if (!(x = v_or_fork())) {
		signrm(1);
		if (cmd)
			execl(sh, sh, "-c", cmd, NULL);
		else {
			write(2, shmsg, sizeof(shmsg) - 1);
			execl(sh, sh, NULL);
		}
		_exit(0);
	}
	if (x != -1)
		wait(NULL);
	if (omode)
		ttopnn();
}
#endif

#if WANT_FORK
/* Create keyboard task */

static int mpxresume(void)
{
	int fds[2];

	if (pipe(fds)) {
		ackkbd = -1;
		return (1);
	}
	tty_accept = NO_MORE_DATA;
	have = 0;
	if (!(kbdpid = fork())) {
		close(fds[1]);
		do {
			unsigned char c;
			int sta;

			pack.who = 0;
			sta = joe_read(fileno(termin), &c, 1);
			if (sta == 0)
				pack.ch = NO_MORE_DATA;
			else
				pack.ch = c;
			pack.size = 0;
			joe_write(mpxsfd, &pack, sizeof(struct packet) - 1024);
		} while (joe_read(fds[0], &pack, 1) == 1);
		_exit(0);
	}
	close(fds[0]);
	ackkbd = fds[1];
	return (0);
}

/* Kill keyboard task */

static void mpxsusp(void)
{
	if (ackkbd!=-1) {
		kill(kbdpid, 9);
		while (wait(NULL) < 0 && errno == EINTR)
			/* do nothing */;
		close(ackkbd);
	}
}
#endif

/* We used to leave the keyboard copy task around during suspend, but
   Cygwin gets confused when two processes are waiting for input and you
   change the tty from raw to cooked (on the call to ttopnn()): the keyboard
   process was stuck in cooked until he got a carriage return- then he
   switched back to raw (he's supposed to switch to raw without waiting for
   the end of line). Probably this should be done for ttshell() as well. */

void ttsusp(void)
{
	int omode;

#ifdef SIGTSTP
	omode = ttymode;
#if WANT_FORK
	mpxsusp();
#endif
	ttclsn();
	fprintf(stderr, "You have suspended the program.  Type 'fg' to return\n");
	kill(0, SIGTSTP);
	if (omode)
		ttopnn();
#if WANT_FORK
	if (ackkbd!= -1)
		mpxresume();
#endif
#else
	ttshell(NULL);
#endif
}

#if WANT_FORK
/* Stuff for asynchronous I/O multiplexing.  We do not use streams or
   select() because joe needs to work on versions of UNIX which predate
   these calls.  Instead, when there is multiple async sources, we use
   helper processes which packetize data from the sources.  A header on each
   packet indicates the source.  There is no guarentee that packets getting
   written to the same pipe don't get interleaved, but you can reasonable
   rely on it with small packets. */

/* This code will explode if pipe, fork, etc. fail. --mirabilos */

static int mpxstart(void)
{
	int fds[2];

	if (pipe(fds)) {
		mpxfd = -1;
		mpxsfd = -1;
		return (1);
	}
	mpxfd = fds[0];
	mpxsfd = fds[1];
	return (mpxresume());
}

static void mpxend(void)
{
	mpxsusp();
	ackkbd = -1;
	close(mpxfd);
	close(mpxsfd);
	if (have)
		havec = pack.ch;
}

/* Get a pty/tty pair.  Returns open pty in 'ptyfd' and returns tty name
 * string in static buffer or NULL if couldn't get a pair.
 */

#ifdef __svr4__
#define USEPTMX 1
#else
#ifdef __CYGWIN__
#define USEPTMX 1
#endif
#endif

#ifdef sgi

/* Newer sgi machines can do it the __svr4__ way, but old ones can't */

extern char *_getpty(int *fildes, int oflag, mode_t mode, int nofork);

static unsigned char *getpty(int *ptyfd)
{
	return (unsigned char *)_getpty(ptyfd, O_RDWR, 0600, 0);
}

#else
#ifdef USEPTMX

/* Strange streams way */

extern char *ptsname(int);

static unsigned char *getpty(int *ptyfd)
{
	int fdm;

	*ptyfd = fdm = open("/dev/ptmx", O_RDWR);
	grantpt(fdm);
	unlockpt(fdm);
	return (unsigned char *)ptsname(fdm);
}

#else
#ifdef HAVE_OPENPTY

/* BSD function, present in libc5 and glibc2 and (duh) the BSDs */

static unsigned char *getpty(int *ptyfd)
{
	static unsigned char name[32];
	int ttyfd;

	if (openpty(ptyfd, &ttyfd, name, NULL, NULL) == 0)
	   return(name);
	else
	   return (NULL);
}

#else
/* The normal way: for each possible pty/tty pair, try to open the pty and
 * then the corresponding tty.  If both could be opened, close them both and
 * then re-open the pty.  If that succeeded, return with the opened pty and the
 * name of the tty.
 *
 * Logically you should only have to succeed in opening the pty- but the
 * permissions may be set wrong on the tty, so we have to try that too.
 * We close them both and re-open the pty because we want the forked process
 * to open the tty- that way it gets to be the controlling tty for that
 * process and the process gets to be the session leader.
 */

static unsigned char *getpty(int *ptyfd)
{
	int x, fd;
	unsigned char *orgpwd = pwd();
	static unsigned char **ptys = NULL;
	static const unsigned char *ttydir;
	static const unsigned char *ptydir;
	static unsigned char ttyname[32];

	if (!ptys) {
		/* HPUX systems */
		ttydir = UC "/dev/pty/";
		ptydir = UC "/dev/ptym/";
		if (chpwd(ptydir) || !(ptys = rexpnd(UC "pty*")))
			if (!ptys) {
				/* Everyone else */
				ttydir = ptydir = UC "/dev/";
				if (!chpwd(ptydir))
					ptys = rexpnd(UC "pty*");
			}
	}
	chpwd(orgpwd);

	if (ptys)
		for (fd = 0; ptys[fd]; ++fd) {
			strlcpy((char *)ttyname, (char *)ptydir, 32);
			strlcat((char *)ttyname, (char  *)(ptys[fd]), 32);
			if ((*ptyfd = open((char *)ttyname, O_RDWR)) >= 0) {
				ptys[fd][0] = 't';
				strlcpy((char *)ttyname, (char *)ttydir, 32);
				strlcat((char *)ttyname, (char *)(ptys[fd]), 32);
				ptys[fd][0] = 'p';
				x = open((char *)ttyname, O_RDWR);
				if (x >= 0) {
					close(x);
					close(*ptyfd);
					strlcpy((char *)ttyname, (char *)ptydir, 32);
					strlcat((char *)ttyname, (char *)(ptys[fd]), 32);
					*ptyfd = open((char *)ttyname, O_RDWR);
					ptys[fd][0] = 't';
					strlcpy((char *)ttyname, (char *)ttydir, 32);
					strlcat((char *)ttyname, (char *)(ptys[fd]), 32);
					ptys[fd][0] = 'p';
					return ttyname;
				} else
					close(*ptyfd);
			}
		}
	return NULL;
}

#endif
#endif
#endif

/* Shell dies signal handler.  Puts pty in non-block mode so
 * that read returns with <1 when all data from process has
 * been read. */
static volatile sig_atomic_t dead = 0;
int death_fd;
static RETSIGTYPE death(int unused)
{
	fcntl(death_fd,F_SETFL,O_NDELAY);
	wait(NULL);
	dead = 1;
}

#ifndef SIGCHLD
#define SIGCHLD SIGCLD
#endif

/* Build a new environment, but replace one variable */

extern unsigned char **mainenv;

static unsigned char **
newenv(unsigned char **old, const unsigned char *s)
{
	unsigned char **new;
	int x, y, z;

	for (x = 0; old[x]; ++x)
		/* nothing */;
	new = malloc((x + 2) * sizeof(unsigned char *));

	for (x = 0, y = 0; old[x]; ++x) {
		for (z = 0; s[z] != '='; ++z)
			if (s[z] != old[x][z])
				break;
		if (s[z] == '=') {
			if (s[z + 1])
				new[y++] = (void *)strdup((const char *)s);
		} else
			new[y++] = old[x];
	}
	if (x == y)
		new[y++] = (void *)strdup((const char *)s);
	new[y] = 0;
	return new;
}

/* Create a shell process */

MPX *
mpxmk(int *ptyfd, const unsigned char *cmd, unsigned char **args,
    void (*func)(B*, unsigned char *, int), void *object,
    void (*die)(B*), void *dieobj)
{
	unsigned char buf[80];
	int fds[2];
	int comm[2];
	pid_t pid;
	int x;
	MPX *m = NULL;
	unsigned char *name;

	/* Get pty/tty pair */
	if (!(name = getpty(ptyfd)))
		return NULL;

	/* Find free slot */
	for (x = 0; x != NPROC; ++x)
		if (!asyncs[x].func) {
			m = asyncs + x;
			break;
		}
	if (x==NPROC)
		return NULL;

	/* PID number pipe */
	if (pipe(comm))
		return (NULL);

	/* Acknowledgement pipe */
	if (pipe(fds)) {
		/* don't leak in error case */
 pipout:
		close(comm[0]);
		close(comm[1]);
		return (NULL);
	}
	m->ackfd = fds[1];

	/*
	 * Fixes cygwin console bug: if you fork() with inverse video
	 * it assumes you want ESC [ 0 m to keep it in inverse video
	 * from then on.
	 */
	set_attr(maint->t,0);

	/* Flush output */
	ttflsh();

	/* Bump no. current async inputs to joe */
	++nmpx;

	/* Start input multiplexer */
	if (ackkbd == -1)
		if (mpxstart()) {
			close(fds[0]);
			close(fds[1]);
			m->ackfd = -1;
			--nmpx;
			goto pipout;
		}

	/* Remember callback function */
	m->func = func;
	m->object = object;
	m->die = die;
	m->dieobj = dieobj;

	/* Create processes... */
	if (!(m->kpid = fork())) {
		/*
		 * This process copies data from shell to joe.
		 * After each packet it sends to joe it waits for
		 * an acknowledgement from joe so that it can not get
		 * too far ahead with buffering.
		 */

		/* Close joe side of pipes */
		close(fds[1]);
		close(comm[0]);

		/* Flag which indicates child died */
		dead = 0;
		death_fd = *ptyfd;
		joe_set_signal(SIGCHLD, death);

		if (!(pid = fork())) {
			/* This process becomes the shell */
			unsigned char **env;

			signrm(0);

			/* Close pty (we only need tty) */
			close(*ptyfd);

			/*
			 * All of this stuff is for dissociating ourself from
			 * the controlling tty (session leader) and starting a
			 * new session. This is the most non-portable part of
			 * UNIX — second only to pty/tty pair creation.
			 */
#ifndef HAVE_LOGIN_TTY

#ifdef TIOCNOTTY
			x = open("/dev/tty", O_RDWR);
			ioctl(x, TIOCNOTTY, 0);
#endif

			/* I think you do setprgp(0,0) on systems with no setsid() */
			setsid();
#ifndef _MINIX
/* http://mail-index.netbsd.org/pkgsrc-bugs/2011/06/13/msg043281.html */
#ifndef SETPGRP_VOID
			setpgrp(0, 0);
#else
			setpgrp();
#endif
#endif

#endif
			/* Close all fds */
			for (x = 0; x != 32; ++x) {
				/* Yes, this is quite a kludge... */
				/* All in the name of portability */
				close(x);
			}

			/* Open the TTY as standard input */
			if ((x = open((char *)name, O_RDWR)) != -1) {
				env = newenv(mainenv, UC "TERM=");

#ifdef HAVE_LOGIN_TTY
				login_tty(x);

#else
				/* This tells the fd that it's a tty (I think) */
#ifdef __svr4__
				ioctl(x, I_PUSH, "ptem");
				ioctl(x, I_PUSH, "ldterm");
#endif

				/* Open stdout, stderr */
				if (dup(x)) {}	/* standard output */
				if (dup(x)) {}	/* standard error */
				/*
				 * yes, stdin, stdout, and stderr must
				 * all be open for reading and writing.
				 * On some systems the shell assumes this.
				 */
#endif

				/*
				 * We could probably have a special TTY
				 * setup for JOE, but for now we'll just
				 * use the TTY setup for the TTY was was
				 * run on.
				 */
#ifdef HAVE_POSIX_TERMIOS
				tcsetattr(0, TCSADRAIN, &oldterm);
#else
#ifdef HAVE_SYSV_TERMIO
				ioctl(0, TCSETAW, &oldterm);
#else
				ioctl(0, TIOCSETN, &oarg);
				ioctl(0, TIOCSETC, &otarg);
				ioctl(0, TIOCSLTC, &oltarg);
#endif
#endif

				/* Execute the shell */
				execve((const char *)cmd, (char **)args, (char **)env);

				/* If shell didn't execute */
				joe_snprintf_1((char *)buf,sizeof(buf),"Couldn't execute shell '%s'\n",cmd);
				if (write(0,(char *)buf,strlen((char *)buf))) {}
				sleep(1);
			}

			_exit(0);
		}

		/* Tell JOE PID of shell */
		joe_write(comm[1], &pid, sizeof(pid));

		/* sigpipe should be ignored here. */

		/* This process copies data from shell to JOE until EOF.  It creates a packet
		   for each data */


		/* We don't really get EOF from a pty- it would just wait forever
		   until someone else writes to the tty.  So: when the shell
		   dies, the child died signal handler death() puts pty in non-block
		   mode.  This allows us to read any remaining data- then
		   read returns 0 and we know we're done. */

 loop:
		pack.who = m;
		pack.ch = 0;

		/* Read data from process */
		pack.size = joe_read(*ptyfd, pack.data, 1024);

		/* On SUNOS 5.8, the very first read from the pty returns 0 for some reason */
		if (!pack.size)
			pack.size = joe_read(*ptyfd, pack.data, 1024);

		if (pack.size > 0) {
			/* Send data to JOE, wait for ack */
			joe_write(mpxsfd, &pack, sizeof(struct packet) - 1024 + pack.size);

			joe_read(fds[0], &pack, 1);
			goto loop;
		} else {
			/* Shell died: return */
			pack.ch = NO_MORE_DATA;
			pack.size = 0;
			joe_write(mpxsfd, &pack, sizeof(struct packet) - 1024);

			_exit(0);
		}
	}
	joe_read(comm[0], &m->pid, sizeof(m->pid));

	/* We only need comm once */
	close(comm[0]);
	close(comm[1]);

	/* Close other side of copy process pipe */
	close(fds[0]);
	return m;
}

static void mpxdied(MPX *m)
{
	if (!--nmpx)
		mpxend();
	while (wait(NULL) < 0 && errno == EINTR)
		/* do nothing */;
	if (m->die)
		m->die(m->dieobj);
	m->func = NULL;
	edupd(1);
}
#endif

void
tty_xonoffbaudrst(void)
{
#ifdef HAVE_POSIX_TERMIOS
	struct termios newterm;
#else
#ifdef HAVE_SYSV_TERMIO
	struct termio newterm;
#else
	struct sgttyb arg;
	struct tchars targ;
#endif
#endif

#ifdef HAVE_POSIX_TERMIOS
	tcgetattr(fileno(termin), &newterm);
	if (noxon)
		newterm.c_iflag &= ~(IXON | IXOFF);
	else
		newterm.c_iflag |= (IXON | IXOFF);
	tcsetattr(fileno(termin), TCSADRAIN, &newterm);
	baud_reset(cfgetospeed(&newterm));
#else
#ifdef HAVE_SYSV_TERMIO
	ioctl(fileno(termin), TCGETA, &newterm);
	if (noxon)
		newterm.c_iflag &= ~(IXON | IXOFF);
	else
		newterm.c_iflag |= (IXON | IXOFF);
	ioctl(fileno(termin), TCSETAW, &newterm);
	baud_reset(newterm.c_cflag & CBAUD);
#else
	ioctl(fileno(termin), TIOCGETP, &arg);
	ioctl(fileno(termin), TIOCGETC, &targ);
	if (noxon) {
		targ.t_startc = -1;
		targ.t_stopc = -1;
	} else {
		targ.t_startc = otarg.t_startc;
		targ.t_stopc = otarg.t_stopc;
	}
	ioctl(fileno(termin), TIOCSETC, &targ);
	baud_reset(arg.sg_ospeed);
#endif
#endif
}