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
|
/*-
* Copyright (c) 1980, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1980, 1991, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)csh.c 8.2 (Berkeley) 10/12/93";
#endif /* not lint */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <unistd.h>
#include <vis.h>
#if __STDC__
# include <stdarg.h>
#else
# include <varargs.h>
#endif
#include "csh.h"
#include "proc.h"
#include "extern.h"
#include "pathnames.h"
extern bool MapsAreInited;
extern bool NLSMapsAreInited;
/*
* C Shell
*
* Bill Joy, UC Berkeley, California, USA
* October 1978, May 1980
*
* Jim Kulp, IIASA, Laxenburg, Austria
* April 1980
*
* Christos Zoulas, Cornell University
* June, 1991
*/
Char *dumphist[] = {STRhistory, STRmh, 0, 0};
Char *loadhist[] = {STRsource, STRmh, STRtildothist, 0};
int nofile = 0;
bool reenter = 0;
bool nverbose = 0;
bool nexececho = 0;
bool quitit = 0;
bool fast = 0;
bool batch = 0;
bool mflag = 0;
bool prompt = 1;
bool enterhist = 0;
bool tellwhat = 0;
extern char **environ;
static int readf __P((void *, char *, int));
static fpos_t seekf __P((void *, fpos_t, int));
static int writef __P((void *, const char *, int));
static int closef __P((void *));
static int srccat __P((Char *, Char *));
static int srcfile __P((char *, bool, bool));
static void phup __P((int));
static void srcunit __P((int, bool, bool));
static void mailchk __P((void));
static Char **defaultpath __P((void));
int
main(argc, argv)
int argc;
char **argv;
{
register Char *cp;
register char *tcp;
register int f;
register char **tempv;
struct sigvec osv;
cshin = stdin;
cshout = stdout;
csherr = stderr;
settimes(); /* Immed. estab. timing base */
/*
* Initialize non constant strings
*/
#ifdef _PATH_BSHELL
STR_BSHELL = SAVE(_PATH_BSHELL);
#endif
#ifdef _PATH_CSHELL
STR_SHELLPATH = SAVE(_PATH_CSHELL);
#endif
STR_environ = blk2short(environ);
environ = short2blk(STR_environ); /* So that we can free it */
STR_WORD_CHARS = SAVE(WORD_CHARS);
HIST = '!';
HISTSUB = '^';
word_chars = STR_WORD_CHARS;
tempv = argv;
if (eq(str2short(tempv[0]), STRaout)) /* A.out's are quittable */
quitit = 1;
uid = getuid();
gid = getgid();
euid = geteuid();
egid = getegid();
/*
* We are a login shell if: 1. we were invoked as -<something> and we had
* no arguments 2. or we were invoked only with the -l flag
*/
loginsh = (**tempv == '-' && argc == 1) ||
(argc == 2 && tempv[1][0] == '-' && tempv[1][1] == 'l' &&
tempv[1][2] == '\0');
if (loginsh && **tempv != '-') {
/*
* Mangle the argv space
*/
tempv[1][0] = '\0';
tempv[1][1] = '\0';
tempv[1] = NULL;
for (tcp = *tempv; *tcp++;)
continue;
for (tcp--; tcp >= *tempv; tcp--)
tcp[1] = tcp[0];
*++tcp = '-';
argc--;
}
if (loginsh)
(void) time(&chktim);
AsciiOnly = 1;
#ifdef NLS
(void) setlocale(LC_ALL, "");
{
int k;
for (k = 0200; k <= 0377 && !Isprint(k); k++)
continue;
AsciiOnly = k > 0377;
}
#else
AsciiOnly = getenv("LANG") == NULL &&
getenv("LC_ALL") == NULL &&
getenv("LC_CTYPE") == NULL;
#endif /* NLS */
/*
* Move the descriptors to safe places. The variable didfds is 0 while we
* have only FSH* to work with. When didfds is true, we have 0,1,2 and
* prefer to use these.
*/
initdesc();
/*
* XXX: This is to keep programs that use stdio happy.
* what we really want is freunopen() ....
* Closing cshin cshout and csherr (which are really stdin stdout
* and stderr at this point and then reopening them in the same order
* gives us again stdin == cshin stdout == cshout and stderr == csherr.
* If that was not the case builtins like printf that use stdio
* would break. But in any case we could fix that with memcpy and
* a bit of pointer manipulation...
* Fortunately this is not needed under the current implementation
* of stdio.
*/
(void) fclose(cshin);
(void) fclose(cshout);
(void) fclose(csherr);
if (!(cshin = funopen((void *) &SHIN, readf, writef, seekf, closef)))
exit(1);
if (!(cshout = funopen((void *) &SHOUT, readf, writef, seekf, closef)))
exit(1);
if (!(csherr = funopen((void *) &SHERR, readf, writef, seekf, closef)))
exit(1);
(void) setvbuf(cshin, NULL, _IOLBF, 0);
(void) setvbuf(cshout, NULL, _IOLBF, 0);
(void) setvbuf(csherr, NULL, _IOLBF, 0);
/*
* Initialize the shell variables. ARGV and PROMPT are initialized later.
* STATUS is also munged in several places. CHILD is munged when
* forking/waiting
*/
set(STRstatus, Strsave(STR0));
if ((tcp = getenv("HOME")) != NULL)
cp = SAVE(tcp);
else
cp = NULL;
if (cp == NULL)
fast = 1; /* No home -> can't read scripts */
else
set(STRhome, cp);
dinit(cp); /* dinit thinks that HOME == cwd in a login
* shell */
/*
* Grab other useful things from the environment. Should we grab
* everything??
*/
if ((tcp = getenv("LOGNAME")) != NULL ||
(tcp = getenv("USER")) != NULL)
set(STRuser, SAVE(tcp));
if ((tcp = getenv("TERM")) != NULL)
set(STRterm, SAVE(tcp));
set(STRshell, Strsave(STR_SHELLPATH));
doldol = putn((int) getpid()); /* For $$ */
shtemp = Strspl(STRtmpsh, doldol); /* For << */
/*
* Record the interrupt states from the parent process. If the parent is
* non-interruptible our hand must be forced or we (and our children) won't
* be either. Our children inherit termination from our parent. We catch it
* only if we are the login shell.
*/
/* parents interruptibility */
(void) sigvec(SIGINT, NULL, &osv);
parintr = (void (*) ()) osv.sv_handler;
(void) sigvec(SIGTERM, NULL, &osv);
parterm = (void (*) ()) osv.sv_handler;
if (loginsh) {
(void) signal(SIGHUP, phup); /* exit processing on HUP */
(void) signal(SIGXCPU, phup); /* ...and on XCPU */
(void) signal(SIGXFSZ, phup); /* ...and on XFSZ */
}
/*
* Process the arguments.
*
* Note that processing of -v/-x is actually delayed till after script
* processing.
*
* We set the first character of our name to be '-' if we are a shell
* running interruptible commands. Many programs which examine ps'es
* use this to filter such shells out.
*/
argc--, tempv++;
while (argc > 0 && (tcp = tempv[0])[0] == '-' && *++tcp != '\0' && !batch) {
do
switch (*tcp++) {
case 0: /* - Interruptible, no prompt */
prompt = 0;
setintr = 1;
nofile = 1;
break;
case 'b': /* -b Next arg is input file */
batch = 1;
break;
case 'c': /* -c Command input from arg */
if (argc == 1)
xexit(0);
argc--, tempv++;
arginp = SAVE(tempv[0]);
prompt = 0;
nofile = 1;
break;
case 'e': /* -e Exit on any error */
exiterr = 1;
break;
case 'f': /* -f Fast start */
fast = 1;
break;
case 'i': /* -i Interactive, even if !intty */
intact = 1;
nofile = 1;
break;
case 'm': /* -m read .cshrc (from su) */
mflag = 1;
break;
case 'n': /* -n Don't execute */
noexec = 1;
break;
case 'q': /* -q (Undoc'd) ... die on quit */
quitit = 1;
break;
case 's': /* -s Read from std input */
nofile = 1;
break;
case 't': /* -t Read one line from input */
onelflg = 2;
prompt = 0;
nofile = 1;
break;
case 'v': /* -v Echo hist expanded input */
nverbose = 1; /* ... later */
break;
case 'x': /* -x Echo just before execution */
nexececho = 1; /* ... later */
break;
case 'V': /* -V Echo hist expanded input */
setNS(STRverbose); /* NOW! */
break;
case 'X': /* -X Echo just before execution */
setNS(STRecho); /* NOW! */
break;
} while (*tcp);
tempv++, argc--;
}
if (quitit) /* With all due haste, for debugging */
(void) signal(SIGQUIT, SIG_DFL);
/*
* Unless prevented by -, -c, -i, -s, or -t, if there are remaining
* arguments the first of them is the name of a shell file from which to
* read commands.
*/
if (nofile == 0 && argc > 0) {
nofile = open(tempv[0], O_RDONLY);
if (nofile < 0) {
child = 1; /* So this doesn't return */
stderror(ERR_SYSTEM, tempv[0], strerror(errno));
}
ffile = SAVE(tempv[0]);
/*
* Replace FSHIN. Handle /dev/std{in,out,err} specially
* since once they are closed we cannot open them again.
* In that case we use our own saved descriptors
*/
if ((SHIN = dmove(nofile, FSHIN)) < 0)
switch(nofile) {
case 0:
SHIN = FSHIN;
break;
case 1:
SHIN = FSHOUT;
break;
case 2:
SHIN = FSHERR;
break;
default:
stderror(ERR_SYSTEM, tempv[0], strerror(errno));
break;
}
(void) ioctl(SHIN, FIOCLEX, NULL);
prompt = 0;
/* argc not used any more */ tempv++;
}
intty = isatty(SHIN);
intty |= intact;
if (intty || (intact && isatty(SHOUT))) {
if (!batch && (uid != euid || gid != egid)) {
errno = EACCES;
child = 1; /* So this doesn't return */
stderror(ERR_SYSTEM, "csh", strerror(errno));
}
}
/*
* Re-initialize path if set in environment
* importpath uses intty and intact
*/
if ((tcp = getenv("PATH")) == NULL)
set1(STRpath, defaultpath(), &shvhed);
else
importpath(SAVE(tcp));
/*
* Decide whether we should play with signals or not. If we are explicitly
* told (via -i, or -) or we are a login shell (arg0 starts with -) or the
* input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx")
* Note that in only the login shell is it likely that parent may have set
* signals to be ignored
*/
if (loginsh || intact || (intty && isatty(SHOUT)))
setintr = 1;
settell();
/*
* Save the remaining arguments in argv.
*/
setq(STRargv, blk2short(tempv), &shvhed);
/*
* Set up the prompt.
*/
if (prompt) {
set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymcent));
/* that's a meta-questionmark */
set(STRprompt2, Strsave(STRmquestion));
}
/*
* If we are an interactive shell, then start fiddling with the signals;
* this is a tricky game.
*/
shpgrp = getpgrp();
opgrp = tpgrp = -1;
if (setintr) {
**argv = '-';
if (!quitit) /* Wary! */
(void) signal(SIGQUIT, SIG_IGN);
(void) signal(SIGINT, pintr);
(void) sigblock(sigmask(SIGINT));
(void) signal(SIGTERM, SIG_IGN);
if (quitit == 0 && arginp == 0) {
(void) signal(SIGTSTP, SIG_IGN);
(void) signal(SIGTTIN, SIG_IGN);
(void) signal(SIGTTOU, SIG_IGN);
/*
* Wait till in foreground, in case someone stupidly runs csh &
* dont want to try to grab away the tty.
*/
if (isatty(FSHERR))
f = FSHERR;
else if (isatty(FSHOUT))
f = FSHOUT;
else if (isatty(OLDSTD))
f = OLDSTD;
else
f = -1;
retry:
if ((tpgrp = tcgetpgrp(f)) != -1) {
if (tpgrp != shpgrp) {
sig_t old = signal(SIGTTIN, SIG_DFL);
(void) kill(0, SIGTTIN);
(void) signal(SIGTTIN, old);
goto retry;
}
opgrp = shpgrp;
shpgrp = getpid();
tpgrp = shpgrp;
/*
* Setpgid will fail if we are a session leader and
* mypid == mypgrp (POSIX 4.3.3)
*/
if (opgrp != shpgrp)
if (setpgid(0, shpgrp) == -1)
goto notty;
/*
* We do that after we set our process group, to make sure
* that the process group belongs to a process in the same
* session as the tty (our process and our group) (POSIX 7.2.4)
*/
if (tcsetpgrp(f, shpgrp) == -1)
goto notty;
(void) ioctl(dcopy(f, FSHTTY), FIOCLEX, NULL);
}
if (tpgrp == -1) {
notty:
(void) fprintf(csherr, "Warning: no access to tty (%s).\n",
strerror(errno));
(void) fprintf(csherr, "Thus no job control in this shell.\n");
}
}
}
if ((setintr == 0) && (parintr == SIG_DFL))
setintr = 1;
(void) signal(SIGCHLD, pchild); /* while signals not ready */
/*
* Set an exit here in case of an interrupt or error reading the shell
* start-up scripts.
*/
reenter = setexit(); /* PWP */
haderr = 0; /* In case second time through */
if (!fast && reenter == 0) {
/* Will have value(STRhome) here because set fast if don't */
{
int osetintr = setintr;
sig_t oparintr = parintr;
sigset_t omask = sigblock(sigmask(SIGINT));
setintr = 0;
parintr = SIG_IGN; /* Disable onintr */
#ifdef _PATH_DOTCSHRC
(void) srcfile(_PATH_DOTCSHRC, 0, 0);
#endif
if (!fast && !arginp && !onelflg)
dohash(NULL, NULL);
#ifdef _PATH_DOTLOGIN
if (loginsh)
(void) srcfile(_PATH_DOTLOGIN, 0, 0);
#endif
(void) sigsetmask(omask);
setintr = osetintr;
parintr = oparintr;
}
(void) srccat(value(STRhome), STRsldotcshrc);
if (!fast && !arginp && !onelflg && !havhash)
dohash(NULL, NULL);
/*
* Source history before .login so that it is available in .login
*/
if ((cp = value(STRhistfile)) != STRNULL)
loadhist[2] = cp;
dosource(loadhist, NULL);
if (loginsh)
(void) srccat(value(STRhome), STRsldotlogin);
}
/*
* Now are ready for the -v and -x flags
*/
if (nverbose)
setNS(STRverbose);
if (nexececho)
setNS(STRecho);
/*
* All the rest of the world is inside this call. The argument to process
* indicates whether it should catch "error unwinds". Thus if we are a
* interactive shell our call here will never return by being blown past on
* an error.
*/
process(setintr);
/*
* Mop-up.
*/
if (intty) {
if (loginsh) {
(void) fprintf(cshout, "logout\n");
(void) close(SHIN);
child = 1;
goodbye();
}
else {
(void) fprintf(cshout, "exit\n");
}
}
rechist();
exitstat();
return (0);
}
void
untty()
{
if (tpgrp > 0) {
(void) setpgid(0, opgrp);
(void) tcsetpgrp(FSHTTY, opgrp);
}
}
void
importpath(cp)
Char *cp;
{
register int i = 0;
register Char *dp;
register Char **pv;
int c;
for (dp = cp; *dp; dp++)
if (*dp == ':')
i++;
/*
* i+2 where i is the number of colons in the path. There are i+1
* directories in the path plus we need room for a zero terminator.
*/
pv = (Char **) xcalloc((size_t) (i + 2), sizeof(Char **));
dp = cp;
i = 0;
if (*dp)
for (;;) {
if ((c = *dp) == ':' || c == 0) {
*dp = 0;
if (*cp != '/' && (euid == 0 || uid == 0) &&
(intact || intty && isatty(SHOUT)))
(void) fprintf(csherr,
"Warning: imported path contains relative components\n");
pv[i++] = Strsave(*cp ? cp : STRdot);
if (c) {
cp = dp + 1;
*dp = ':';
}
else
break;
}
dp++;
}
pv[i] = 0;
set1(STRpath, pv, &shvhed);
}
/*
* Source to the file which is the catenation of the argument names.
*/
static int
srccat(cp, dp)
Char *cp, *dp;
{
register Char *ep = Strspl(cp, dp);
char *ptr = short2str(ep);
xfree((ptr_t) ep);
return srcfile(ptr, mflag ? 0 : 1, 0);
}
/*
* Source to a file putting the file descriptor in a safe place (> 2).
*/
static int
srcfile(f, onlyown, flag)
char *f;
bool onlyown, flag;
{
register int unit;
if ((unit = open(f, O_RDONLY)) == -1)
return 0;
unit = dmove(unit, -1);
(void) ioctl(unit, FIOCLEX, NULL);
srcunit(unit, onlyown, flag);
return 1;
}
/*
* Source to a unit. If onlyown it must be our file or our group or
* we don't chance it. This occurs on ".cshrc"s and the like.
*/
int insource;
static void
srcunit(unit, onlyown, hflg)
register int unit;
bool onlyown, hflg;
{
/* We have to push down a lot of state here */
/* All this could go into a structure */
int oSHIN = -1, oldintty = intty, oinsource = insource;
struct whyle *oldwhyl = whyles;
Char *ogointr = gointr, *oarginp = arginp;
Char *oevalp = evalp, **oevalvec = evalvec;
int oonelflg = onelflg;
bool oenterhist = enterhist;
char OHIST = HIST;
bool otell = cantell;
struct Bin saveB;
volatile sigset_t omask;
jmp_buf oldexit;
/* The (few) real local variables */
int my_reenter;
if (unit < 0)
return;
if (didfds)
donefds();
if (onlyown) {
struct stat stb;
if (fstat(unit, &stb) < 0) {
(void) close(unit);
return;
}
}
/*
* There is a critical section here while we are pushing down the input
* stream since we have stuff in different structures. If we weren't
* careful an interrupt could corrupt SHIN's Bin structure and kill the
* shell.
*
* We could avoid the critical region by grouping all the stuff in a single
* structure and pointing at it to move it all at once. This is less
* efficient globally on many variable references however.
*/
insource = 1;
getexit(oldexit);
omask = 0;
if (setintr)
omask = sigblock(sigmask(SIGINT));
/* Setup the new values of the state stuff saved above */
bcopy((char *) &B, (char *) &(saveB), sizeof(B));
fbuf = NULL;
fseekp = feobp = fblocks = 0;
oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0;
intty = isatty(SHIN), whyles = 0, gointr = 0;
evalvec = 0;
evalp = 0;
enterhist = hflg;
if (enterhist)
HIST = '\0';
/*
* Now if we are allowing commands to be interrupted, we let ourselves be
* interrupted.
*/
if (setintr)
(void) sigsetmask(omask);
settell();
if ((my_reenter = setexit()) == 0)
process(0); /* 0 -> blow away on errors */
if (setintr)
(void) sigsetmask(omask);
if (oSHIN >= 0) {
register int i;
/* We made it to the new state... free up its storage */
/* This code could get run twice but xfree doesn't care */
for (i = 0; i < fblocks; i++)
xfree((ptr_t) fbuf[i]);
xfree((ptr_t) fbuf);
/* Reset input arena */
bcopy((char *) &(saveB), (char *) &B, sizeof(B));
(void) close(SHIN), SHIN = oSHIN;
arginp = oarginp, onelflg = oonelflg;
evalp = oevalp, evalvec = oevalvec;
intty = oldintty, whyles = oldwhyl, gointr = ogointr;
if (enterhist)
HIST = OHIST;
enterhist = oenterhist;
cantell = otell;
}
resexit(oldexit);
/*
* If process reset() (effectively an unwind) then we must also unwind.
*/
if (my_reenter)
stderror(ERR_SILENT);
insource = oinsource;
}
void
rechist()
{
Char buf[BUFSIZ], hbuf[BUFSIZ], *hfile;
int fp, ftmp, oldidfds;
struct varent *shist;
if (!fast) {
/*
* If $savehist is just set, we use the value of $history
* else we use the value in $savehist
*/
if ((shist = adrof(STRsavehist)) != NULL) {
if (shist->vec[0][0] != '\0')
(void) Strcpy(hbuf, shist->vec[0]);
else if ((shist = adrof(STRhistory)) && shist->vec[0][0] != '\0')
(void) Strcpy(hbuf, shist->vec[0]);
else
return;
}
else
return;
if ((hfile = value(STRhistfile)) == STRNULL) {
hfile = Strcpy(buf, value(STRhome));
(void) Strcat(buf, STRsldthist);
}
if ((fp = creat(short2str(hfile), 0600)) == -1)
return;
oldidfds = didfds;
didfds = 0;
ftmp = SHOUT;
SHOUT = fp;
dumphist[2] = hbuf;
dohist(dumphist, NULL);
SHOUT = ftmp;
(void) close(fp);
didfds = oldidfds;
}
}
void
goodbye()
{
rechist();
if (loginsh) {
(void) signal(SIGQUIT, SIG_IGN);
(void) signal(SIGINT, SIG_IGN);
(void) signal(SIGTERM, SIG_IGN);
setintr = 0; /* No interrupts after "logout" */
if (!(adrof(STRlogout)))
set(STRlogout, STRnormal);
#ifdef _PATH_DOTLOGOUT
(void) srcfile(_PATH_DOTLOGOUT, 0, 0);
#endif
if (adrof(STRhome))
(void) srccat(value(STRhome), STRsldtlogout);
}
exitstat();
}
void
exitstat()
{
Char *s;
#ifdef PROF
monitor(0);
#endif
/*
* Note that if STATUS is corrupted (i.e. getn bombs) then error will exit
* directly because we poke child here. Otherwise we might continue
* unwarrantedly (sic).
*/
child = 1;
s = value(STRstatus);
xexit(s ? getn(s) : 0);
}
/*
* in the event of a HUP we want to save the history
*/
static void
phup(sig)
int sig;
{
rechist();
/*
* We kill the last foreground process group. It then becomes
* responsible to propagate the SIGHUP to its progeny.
*/
{
struct process *pp, *np;
for (pp = proclist.p_next; pp; pp = pp->p_next) {
np = pp;
/*
* Find if this job is in the foreground. It could be that
* the process leader has exited and the foreground flag
* is cleared for it.
*/
do
/*
* If a process is in the foreground; we try to kill
* it's process group. If we succeed, then the
* whole job is gone. Otherwise we keep going...
* But avoid sending HUP to the shell again.
*/
if ((np->p_flags & PFOREGND) != 0 && np->p_jobid != shpgrp &&
killpg(np->p_jobid, SIGHUP) != -1) {
/* In case the job was suspended... */
(void) killpg(np->p_jobid, SIGCONT);
break;
}
while ((np = np->p_friends) != pp);
}
}
_exit(sig);
}
Char *jobargv[2] = {STRjobs, 0};
/*
* Catch an interrupt, e.g. during lexical input.
* If we are an interactive shell, we reset the interrupt catch
* immediately. In any case we drain the shell output,
* and finally go through the normal error mechanism, which
* gets a chance to make the shell go away.
*/
/* ARGSUSED */
void
pintr(notused)
int notused;
{
pintr1(1);
}
void
pintr1(wantnl)
bool wantnl;
{
Char **v;
sigset_t omask;
omask = sigblock((sigset_t) 0);
if (setintr) {
(void) sigsetmask(omask & ~sigmask(SIGINT));
if (pjobs) {
pjobs = 0;
(void) fprintf(cshout, "\n");
dojobs(jobargv, NULL);
stderror(ERR_NAME | ERR_INTR);
}
}
(void) sigsetmask(omask & ~sigmask(SIGCHLD));
(void) fpurge(cshout);
(void) endpwent();
/*
* If we have an active "onintr" then we search for the label. Note that if
* one does "onintr -" then we shan't be interruptible so we needn't worry
* about that here.
*/
if (gointr) {
gotolab(gointr);
timflg = 0;
if ((v = pargv) != NULL)
pargv = 0, blkfree(v);
if ((v = gargv) != NULL)
gargv = 0, blkfree(v);
reset();
}
else if (intty && wantnl) {
(void) fputc('\r', cshout);
(void) fputc('\n', cshout);
}
stderror(ERR_SILENT);
}
/*
* Process is the main driving routine for the shell.
* It runs all command processing, except for those within { ... }
* in expressions (which is run by a routine evalav in sh.exp.c which
* is a stripped down process), and `...` evaluation which is run
* also by a subset of this code in sh.glob.c in the routine backeval.
*
* The code here is a little strange because part of it is interruptible
* and hence freeing of structures appears to occur when none is necessary
* if this is ignored.
*
* Note that if catch is not set then we will unwind on any error.
* If an end-of-file occurs, we return.
*/
static struct command *savet = NULL;
void
process(catch)
bool catch;
{
jmp_buf osetexit;
struct command *t = savet;
savet = NULL;
getexit(osetexit);
for (;;) {
pendjob();
paraml.next = paraml.prev = ¶ml;
paraml.word = STRNULL;
(void) setexit();
justpr = enterhist; /* execute if not entering history */
/*
* Interruptible during interactive reads
*/
if (setintr)
(void) sigsetmask(sigblock((sigset_t) 0) & ~sigmask(SIGINT));
/*
* For the sake of reset()
*/
freelex(¶ml);
if (savet)
freesyn(savet), savet = NULL;
if (haderr) {
if (!catch) {
/* unwind */
doneinp = 0;
resexit(osetexit);
savet = t;
reset();
}
haderr = 0;
/*
* Every error is eventually caught here or the shell dies. It is
* at this point that we clean up any left-over open files, by
* closing all but a fixed number of pre-defined files. Thus
* routines don't have to worry about leaving files open due to
* deeper errors... they will get closed here.
*/
closem();
continue;
}
if (doneinp) {
doneinp = 0;
break;
}
if (chkstop)
chkstop--;
if (neednote)
pnote();
if (intty && prompt && evalvec == 0) {
mailchk();
/*
* If we are at the end of the input buffer then we are going to
* read fresh stuff. Otherwise, we are rereading input and don't
* need or want to prompt.
*/
if (aret == F_SEEK && fseekp == feobp)
printprompt();
(void) fflush(cshout);
}
if (seterr) {
xfree((ptr_t) seterr);
seterr = NULL;
}
/*
* Echo not only on VERBOSE, but also with history expansion. If there
* is a lexical error then we forego history echo.
*/
if ((lex(¶ml) && !seterr && intty) || adrof(STRverbose)) {
prlex(csherr, ¶ml);
}
/*
* The parser may lose space if interrupted.
*/
if (setintr)
(void) sigblock(sigmask(SIGINT));
/*
* Save input text on the history list if reading in old history, or it
* is from the terminal at the top level and not in a loop.
*
* PWP: entry of items in the history list while in a while loop is done
* elsewhere...
*/
if (enterhist || (catch && intty && !whyles))
savehist(¶ml);
/*
* Print lexical error messages, except when sourcing history lists.
*/
if (!enterhist && seterr)
stderror(ERR_OLD);
/*
* If had a history command :p modifier then this is as far as we
* should go
*/
if (justpr)
reset();
alias(¶ml);
/*
* Parse the words of the input into a parse tree.
*/
savet = syntax(paraml.next, ¶ml, 0);
if (seterr)
stderror(ERR_OLD);
execute(savet, (tpgrp > 0 ? tpgrp : -1), NULL, NULL);
/*
* Made it!
*/
freelex(¶ml);
freesyn((struct command *) savet), savet = NULL;
}
resexit(osetexit);
savet = t;
}
void
/*ARGSUSED*/
dosource(v, t)
Char **v;
struct command *t;
{
register Char *f;
bool hflg = 0;
Char buf[BUFSIZ];
v++;
if (*v && eq(*v, STRmh)) {
if (*++v == NULL)
stderror(ERR_NAME | ERR_HFLAG);
hflg++;
}
(void) Strcpy(buf, *v);
f = globone(buf, G_ERROR);
(void) strcpy((char *) buf, short2str(f));
xfree((ptr_t) f);
if (!srcfile((char *) buf, 0, hflg) && !hflg)
stderror(ERR_SYSTEM, (char *) buf, strerror(errno));
}
/*
* Check for mail.
* If we are a login shell, then we don't want to tell
* about any mail file unless its been modified
* after the time we started.
* This prevents us from telling the user things he already
* knows, since the login program insists on saying
* "You have mail."
*/
static void
mailchk()
{
register struct varent *v;
register Char **vp;
time_t t;
int intvl, cnt;
struct stat stb;
bool new;
v = adrof(STRmail);
if (v == 0)
return;
(void) time(&t);
vp = v->vec;
cnt = blklen(vp);
intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL;
if (intvl < 1)
intvl = 1;
if (chktim + intvl > t)
return;
for (; *vp; vp++) {
if (stat(short2str(*vp), &stb) < 0)
continue;
new = stb.st_mtime > time0.tv_sec;
if (stb.st_size == 0 || stb.st_atime > stb.st_mtime ||
(stb.st_atime < chktim && stb.st_mtime < chktim) ||
(loginsh && !new))
continue;
if (cnt == 1)
(void) fprintf(cshout, "You have %smail.\n", new ? "new " : "");
else
(void) fprintf(cshout, "%s in %s.\n", new ? "New mail" : "Mail",
vis_str(*vp));
}
chktim = t;
}
/*
* Extract a home directory from the password file
* The argument points to a buffer where the name of the
* user whose home directory is sought is currently.
* We write the home directory of the user back there.
*/
int
gethdir(home)
Char *home;
{
Char *h;
struct passwd *pw;
/*
* Is it us?
*/
if (*home == '\0') {
if ((h = value(STRhome)) != NULL) {
(void) Strcpy(home, h);
return 0;
}
else
return 1;
}
if ((pw = getpwnam(short2str(home))) != NULL) {
(void) Strcpy(home, str2short(pw->pw_dir));
return 0;
}
else
return 1;
}
/*
* When didfds is set, we do I/O from 0, 1, 2 otherwise from 15, 16, 17
* We also check if the shell has already changed the decriptor to point to
* 0, 1, 2 when didfds is set.
*/
#define DESC(a) (*((int *) (a)) - (didfds && *((int *) a) >= FSHIN ? FSHIN : 0))
static int
readf(oreo, buf, siz)
void *oreo;
char *buf;
int siz;
{
return read(DESC(oreo), buf, siz);
}
static int
writef(oreo, buf, siz)
void *oreo;
const char *buf;
int siz;
{
return write(DESC(oreo), buf, siz);
}
static fpos_t
seekf(oreo, off, whence)
void *oreo;
fpos_t off;
int whence;
{
return lseek(DESC(oreo), off, whence);
}
static int
closef(oreo)
void *oreo;
{
return close(DESC(oreo));
}
/*
* Print the visible version of a string.
*/
int
vis_fputc(ch, fp)
int ch;
FILE *fp;
{
char uenc[5]; /* 4 + NULL */
if (ch & QUOTE)
return fputc(ch & TRIM, fp);
/*
* XXX: When we are in AsciiOnly we want all characters >= 0200 to
* be encoded, but currently there is no way in vis to do that.
*/
(void) vis(uenc, ch & TRIM, VIS_NOSLASH, 0);
return fputs(uenc, fp);
}
/*
* Move the initial descriptors to their eventual
* resting places, closin all other units.
*/
void
initdesc()
{
didfds = 0; /* 0, 1, 2 aren't set up */
(void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, NULL);
(void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL);
(void) ioctl(SHERR = dcopy(2, FSHERR), FIOCLEX, NULL);
(void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, NULL);
closem();
}
void
#ifdef PROF
done(i)
#else
xexit(i)
#endif
int i;
{
untty();
_exit(i);
}
static Char **
defaultpath()
{
char *ptr;
Char **blk, **blkp;
struct stat stb;
blkp = blk = (Char **) xmalloc((size_t) sizeof(Char *) * 10);
#define DIRAPPEND(a) \
if (stat(ptr = a, &stb) == 0 && (stb.st_mode & S_IFMT) == S_IFDIR) \
*blkp++ = SAVE(ptr)
DIRAPPEND(_PATH_BIN);
DIRAPPEND(_PATH_USRBIN);
#undef DIRAPPEND
if (euid != 0 && uid != 0)
*blkp++ = Strsave(STRdot);
*blkp = NULL;
return (blk);
}
void
printprompt()
{
register Char *cp;
if (!whyles) {
for (cp = value(STRprompt); *cp; cp++)
if (*cp == HIST)
(void) fprintf(cshout, "%d", eventno + 1);
else {
if (*cp == '\\' && cp[1] == HIST)
cp++;
(void) vis_fputc(*cp | QUOTE, cshout);
}
}
else
/*
* Prompt for forward reading loop body content.
*/
(void) fprintf(cshout, "? ");
(void) fflush(cshout);
}
|