Commit | Line | Data |
---|---|---|
b79f4fa9 DF |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
094e80ed | 3 | * All rights reserved. The Berkeley Software License Agreement |
b79f4fa9 DF |
4 | * specifies the terms and conditions for redistribution. |
5 | */ | |
6 | ||
35371dec | 7 | #ifndef lint |
c502712b | 8 | static char *sccsid = "@(#)csh.c 5.10 (Berkeley) %G%"; |
094e80ed | 9 | #endif |
04d3b78c BJ |
10 | |
11 | #include "sh.h" | |
12 | #include <sys/ioctl.h> | |
5fe577ad | 13 | #include <sys/file.h> |
c502712b | 14 | #include "pathnames.h" |
5fe577ad | 15 | |
04d3b78c BJ |
16 | /* |
17 | * C Shell | |
18 | * | |
19 | * Bill Joy, UC Berkeley, California, USA | |
20 | * October 1978, May 1980 | |
21 | * | |
22 | * Jim Kulp, IIASA, Laxenburg, Austria | |
23 | * April 1980 | |
24 | */ | |
25 | ||
37c9c5f3 | 26 | char *pathlist[] = { ".", _PATH_UCB, _PATH_BIN, _PATH_USRBIN, 0 }; |
6ea8dfee | 27 | char *dumphist[] = { "history", "-h", 0, 0 }; |
d7929fa7 | 28 | char *loadhist[] = { "source", "-h", "~/.history", 0 }; |
04d3b78c BJ |
29 | char HIST = '!'; |
30 | char HISTSUB = '^'; | |
1274df0a | 31 | bool mflag; |
04d3b78c BJ |
32 | bool nofile; |
33 | bool reenter; | |
34 | bool nverbose; | |
35 | bool nexececho; | |
36 | bool quitit; | |
37 | bool fast; | |
f0bb61e3 | 38 | bool batch; |
04d3b78c | 39 | bool prompt = 1; |
63af20f7 | 40 | bool enterhist = 0; |
04d3b78c | 41 | |
00705acc JL |
42 | extern gid_t getegid(), getgid(); |
43 | extern uid_t geteuid(), getuid(); | |
44 | ||
04d3b78c BJ |
45 | main(c, av) |
46 | int c; | |
47 | char **av; | |
48 | { | |
49 | register char **v, *cp; | |
50 | register int f; | |
d33af40e | 51 | struct sigvec osv; |
04d3b78c BJ |
52 | |
53 | settimes(); /* Immed. estab. timing base */ | |
54 | v = av; | |
55 | if (eq(v[0], "a.out")) /* A.out's are quittable */ | |
56 | quitit = 1; | |
57 | uid = getuid(); | |
d33af40e | 58 | loginsh = **v == '-' && c == 1; |
04d3b78c | 59 | if (loginsh) |
35371dec | 60 | (void) time(&chktim); |
04d3b78c BJ |
61 | |
62 | /* | |
63 | * Move the descriptors to safe places. | |
64 | * The variable didfds is 0 while we have only FSH* to work with. | |
65 | * When didfds is true, we have 0,1,2 and prefer to use these. | |
66 | */ | |
67 | initdesc(); | |
68 | ||
69 | /* | |
70 | * Initialize the shell variables. | |
71 | * ARGV and PROMPT are initialized later. | |
72 | * STATUS is also munged in several places. | |
73 | * CHILD is munged when forking/waiting | |
74 | */ | |
75 | ||
76 | set("status", "0"); | |
77 | dinit(cp = getenv("HOME")); /* dinit thinks that HOME == cwd in a | |
78 | * login shell */ | |
79 | if (cp == NOSTR) | |
80 | fast++; /* No home -> can't read scripts */ | |
81 | else | |
82 | set("home", savestr(cp)); | |
83 | /* | |
84 | * Grab other useful things from the environment. | |
85 | * Should we grab everything?? | |
86 | */ | |
87 | if ((cp = getenv("USER")) != NOSTR) | |
88 | set("user", savestr(cp)); | |
89 | if ((cp = getenv("TERM")) != NOSTR) | |
90 | set("term", savestr(cp)); | |
91 | /* | |
92 | * Re-initialize path if set in environment | |
93 | */ | |
94 | if ((cp = getenv("PATH")) == NOSTR) | |
95 | set1("path", saveblk(pathlist), &shvhed); | |
35371dec EW |
96 | else |
97 | importpath(cp); | |
5fe577ad | 98 | set("shell", _PATH_CSHELL); |
04d3b78c BJ |
99 | |
100 | doldol = putn(getpid()); /* For $$ */ | |
101 | shtemp = strspl("/tmp/sh", doldol); /* For << */ | |
102 | ||
103 | /* | |
104 | * Record the interrupt states from the parent process. | |
105 | * If the parent is non-interruptible our hand must be forced | |
106 | * or we (and our children) won't be either. | |
107 | * Our children inherit termination from our parent. | |
108 | * We catch it only if we are the login shell. | |
109 | */ | |
35371dec EW |
110 | /* parents interruptibility */ |
111 | (void) sigvec(SIGINT, (struct sigvec *)0, &osv); | |
d33af40e | 112 | parintr = osv.sv_handler; |
35371dec EW |
113 | /* parents terminability */ |
114 | (void) sigvec(SIGTERM, (struct sigvec *)0, &osv); | |
d33af40e | 115 | parterm = osv.sv_handler; |
f66d6be5 | 116 | if (loginsh) { |
35371dec EW |
117 | (void) signal(SIGHUP, phup); /* exit processing on HUP */ |
118 | (void) signal(SIGXCPU, phup); /* ...and on XCPU */ | |
119 | (void) signal(SIGXFSZ, phup); /* ...and on XFSZ */ | |
f66d6be5 | 120 | } |
04d3b78c BJ |
121 | |
122 | /* | |
123 | * Process the arguments. | |
124 | * | |
125 | * Note that processing of -v/-x is actually delayed till after | |
126 | * script processing. | |
04d3b78c BJ |
127 | */ |
128 | c--, v++; | |
f0bb61e3 | 129 | while (c > 0 && (cp = v[0])[0] == '-' && *++cp != '\0' && !batch) { |
04d3b78c BJ |
130 | do switch (*cp++) { |
131 | ||
f0bb61e3 RC |
132 | case 'b': /* -b Next arg is input file */ |
133 | batch++; | |
134 | break; | |
135 | ||
04d3b78c BJ |
136 | case 'c': /* -c Command input from arg */ |
137 | if (c == 1) | |
138 | exit(0); | |
139 | c--, v++; | |
140 | arginp = v[0]; | |
141 | prompt = 0; | |
142 | nofile++; | |
143 | break; | |
144 | ||
145 | case 'e': /* -e Exit on any error */ | |
146 | exiterr++; | |
147 | break; | |
148 | ||
149 | case 'f': /* -f Fast start */ | |
150 | fast++; | |
151 | break; | |
152 | ||
153 | case 'i': /* -i Interactive, even if !intty */ | |
154 | intact++; | |
155 | nofile++; | |
156 | break; | |
157 | ||
1274df0a KB |
158 | case 'm': /* -m read .cshrc (from su) */ |
159 | mflag++; | |
160 | break; | |
161 | ||
04d3b78c BJ |
162 | case 'n': /* -n Don't execute */ |
163 | noexec++; | |
164 | break; | |
165 | ||
166 | case 'q': /* -q (Undoc'd) ... die on quit */ | |
167 | quitit = 1; | |
168 | break; | |
169 | ||
170 | case 's': /* -s Read from std input */ | |
171 | nofile++; | |
172 | break; | |
173 | ||
174 | case 't': /* -t Read one line from input */ | |
175 | onelflg = 2; | |
176 | prompt = 0; | |
177 | nofile++; | |
178 | break; | |
179 | ||
180 | case 'v': /* -v Echo hist expanded input */ | |
181 | nverbose = 1; /* ... later */ | |
182 | break; | |
183 | ||
184 | case 'x': /* -x Echo just before execution */ | |
185 | nexececho = 1; /* ... later */ | |
186 | break; | |
187 | ||
188 | case 'V': /* -V Echo hist expanded input */ | |
189 | setNS("verbose"); /* NOW! */ | |
190 | break; | |
191 | ||
192 | case 'X': /* -X Echo just before execution */ | |
193 | setNS("echo"); /* NOW! */ | |
194 | break; | |
195 | ||
196 | } while (*cp); | |
197 | v++, c--; | |
198 | } | |
199 | ||
200 | if (quitit) /* With all due haste, for debugging */ | |
35371dec | 201 | (void) signal(SIGQUIT, SIG_DFL); |
04d3b78c BJ |
202 | |
203 | /* | |
f0bb61e3 | 204 | * Unless prevented by -c, -i, -s, or -t, if there |
04d3b78c BJ |
205 | * are remaining arguments the first of them is the name |
206 | * of a shell file from which to read commands. | |
207 | */ | |
208 | if (nofile == 0 && c > 0) { | |
209 | nofile = open(v[0], 0); | |
210 | if (nofile < 0) { | |
211 | child++; /* So this ... */ | |
212 | Perror(v[0]); /* ... doesn't return */ | |
213 | } | |
214 | file = v[0]; | |
215 | SHIN = dmove(nofile, FSHIN); /* Replace FSHIN */ | |
35371dec | 216 | (void) ioctl(SHIN, FIOCLEX, (char *)0); |
04d3b78c BJ |
217 | prompt = 0; |
218 | c--, v++; | |
219 | } | |
dee2e6bb | 220 | if (!batch && (uid != geteuid() || getgid() != getegid())) { |
f0bb61e3 RC |
221 | errno = EACCES; |
222 | child++; /* So this ... */ | |
223 | Perror("csh"); /* ... doesn't return */ | |
224 | } | |
04d3b78c BJ |
225 | /* |
226 | * Consider input a tty if it really is or we are interactive. | |
227 | */ | |
228 | intty = intact || isatty(SHIN); | |
229 | /* | |
230 | * Decide whether we should play with signals or not. | |
231 | * If we are explicitly told (via -i, or -) or we are a login | |
232 | * shell (arg0 starts with -) or the input and output are both | |
233 | * the ttys("csh", or "csh</dev/ttyx>/dev/ttyx") | |
234 | * Note that in only the login shell is it likely that parent | |
235 | * may have set signals to be ignored | |
236 | */ | |
3b1a0a1e | 237 | if (loginsh || intact || intty && isatty(SHOUT)) |
04d3b78c BJ |
238 | setintr = 1; |
239 | #ifdef TELL | |
240 | settell(); | |
241 | #endif | |
242 | /* | |
243 | * Save the remaining arguments in argv. | |
244 | */ | |
245 | setq("argv", v, &shvhed); | |
246 | ||
247 | /* | |
248 | * Set up the prompt. | |
249 | */ | |
250 | if (prompt) | |
251 | set("prompt", uid == 0 ? "# " : "% "); | |
252 | ||
253 | /* | |
254 | * If we are an interactive shell, then start fiddling | |
255 | * with the signals; this is a tricky game. | |
256 | */ | |
257 | shpgrp = getpgrp(0); | |
258 | opgrp = tpgrp = -1; | |
259 | oldisc = -1; | |
260 | if (setintr) { | |
261 | **av = '-'; | |
262 | if (!quitit) /* Wary! */ | |
35371dec EW |
263 | (void) signal(SIGQUIT, SIG_IGN); |
264 | (void) signal(SIGINT, pintr); | |
265 | (void) sigblock(sigmask(SIGINT)); | |
266 | (void) signal(SIGTERM, SIG_IGN); | |
04d3b78c | 267 | if (quitit == 0 && arginp == 0) { |
35371dec EW |
268 | (void) signal(SIGTSTP, SIG_IGN); |
269 | (void) signal(SIGTTIN, SIG_IGN); | |
270 | (void) signal(SIGTTOU, SIG_IGN); | |
04d3b78c BJ |
271 | /* |
272 | * Wait till in foreground, in case someone | |
273 | * stupidly runs | |
274 | * csh & | |
275 | * dont want to try to grab away the tty. | |
276 | */ | |
277 | if (isatty(FSHDIAG)) | |
278 | f = FSHDIAG; | |
279 | else if (isatty(FSHOUT)) | |
280 | f = FSHOUT; | |
281 | else if (isatty(OLDSTD)) | |
282 | f = OLDSTD; | |
283 | else | |
284 | f = -1; | |
285 | retry: | |
35371dec EW |
286 | if (ioctl(f, TIOCGPGRP, (char *)&tpgrp) == 0 && |
287 | tpgrp != -1) { | |
04d3b78c BJ |
288 | int ldisc; |
289 | if (tpgrp != shpgrp) { | |
d33af40e | 290 | int (*old)() = signal(SIGTTIN, SIG_DFL); |
35371dec EW |
291 | (void) kill(0, SIGTTIN); |
292 | (void) signal(SIGTTIN, old); | |
04d3b78c BJ |
293 | goto retry; |
294 | } | |
35371dec | 295 | if (ioctl(f, TIOCGETD, (char *)&oldisc) != 0) |
04d3b78c BJ |
296 | goto notty; |
297 | if (oldisc != NTTYDISC) { | |
d7929fa7 KM |
298 | #ifdef DEBUG |
299 | printf("Switching to new tty driver...\n"); | |
300 | #endif DEBUG | |
04d3b78c | 301 | ldisc = NTTYDISC; |
35371dec EW |
302 | (void) ioctl(f, TIOCSETD, |
303 | (char *)&ldisc); | |
04d3b78c BJ |
304 | } else |
305 | oldisc = -1; | |
306 | opgrp = shpgrp; | |
307 | shpgrp = getpid(); | |
308 | tpgrp = shpgrp; | |
35371dec EW |
309 | (void) ioctl(f, TIOCSPGRP, (char *)&shpgrp); |
310 | (void) setpgrp(0, shpgrp); | |
311 | (void) ioctl(dcopy(f, FSHTTY), FIOCLEX, | |
312 | (char *)0); | |
04d3b78c BJ |
313 | } else { |
314 | notty: | |
315 | printf("Warning: no access to tty; thus no job control in this shell...\n"); | |
316 | tpgrp = -1; | |
317 | } | |
318 | } | |
319 | } | |
3b1a0a1e KM |
320 | if (setintr == 0 && parintr == SIG_DFL) |
321 | setintr++; | |
35371dec | 322 | (void) signal(SIGCHLD, pchild); /* while signals not ready */ |
04d3b78c BJ |
323 | |
324 | /* | |
325 | * Set an exit here in case of an interrupt or error reading | |
326 | * the shell start-up scripts. | |
327 | */ | |
328 | setexit(); | |
329 | haderr = 0; /* In case second time through */ | |
330 | if (!fast && reenter == 0) { | |
331 | reenter++; | |
5fe577ad KB |
332 | { |
333 | int osetintr, omask; | |
334 | osetintr = setintr; | |
335 | omask = sigblock(sigmask(SIGINT)); | |
336 | setintr = 0; | |
337 | srcunit(open(_PATH_DOTCSHRC, O_RDONLY), 0, 0); | |
338 | if (!fast && !arginp && !onelflg) | |
339 | dohash(); | |
340 | if (loginsh) | |
341 | srcunit(open(_PATH_DOTLOGIN, O_RDONLY), 0, 0); | |
342 | (void)sigsetmask(omask); | |
343 | setintr = osetintr; | |
344 | } | |
04d3b78c BJ |
345 | /* Will have value("home") here because set fast if don't */ |
346 | srccat(value("home"), "/.cshrc"); | |
35371dec | 347 | if (!fast && !arginp && !onelflg && !havhash) |
04d3b78c BJ |
348 | dohash(); |
349 | if (loginsh) { | |
04d3b78c BJ |
350 | srccat(value("home"), "/.login"); |
351 | } | |
5eaf2044 | 352 | dosource(loadhist); |
04d3b78c BJ |
353 | } |
354 | ||
355 | /* | |
356 | * Now are ready for the -v and -x flags | |
357 | */ | |
358 | if (nverbose) | |
359 | setNS("verbose"); | |
360 | if (nexececho) | |
361 | setNS("echo"); | |
362 | ||
363 | /* | |
364 | * All the rest of the world is inside this call. | |
365 | * The argument to process indicates whether it should | |
366 | * catch "error unwinds". Thus if we are a interactive shell | |
367 | * our call here will never return by being blown past on an error. | |
368 | */ | |
369 | process(setintr); | |
370 | ||
371 | /* | |
372 | * Mop-up. | |
373 | */ | |
374 | if (loginsh) { | |
375 | printf("logout\n"); | |
35371dec | 376 | (void) close(SHIN); |
04d3b78c BJ |
377 | child++; |
378 | goodbye(); | |
379 | } | |
d7929fa7 | 380 | rechist(); |
04d3b78c BJ |
381 | exitstat(); |
382 | } | |
383 | ||
384 | untty() | |
385 | { | |
386 | ||
387 | if (tpgrp > 0) { | |
35371dec EW |
388 | (void) setpgrp(0, opgrp); |
389 | (void) ioctl(FSHTTY, TIOCSPGRP, (char *)&opgrp); | |
04d3b78c | 390 | if (oldisc != -1 && oldisc != NTTYDISC) { |
d7929fa7 | 391 | #ifdef DEBUG |
04d3b78c | 392 | printf("\nReverting to old tty driver...\n"); |
d7929fa7 | 393 | #endif DEBUG |
35371dec | 394 | (void) ioctl(FSHTTY, TIOCSETD, (char *)&oldisc); |
04d3b78c BJ |
395 | } |
396 | } | |
397 | } | |
398 | ||
399 | importpath(cp) | |
ec1a81af | 400 | char *cp; |
04d3b78c BJ |
401 | { |
402 | register int i = 0; | |
403 | register char *dp; | |
404 | register char **pv; | |
405 | int c; | |
406 | static char dot[2] = {'.', 0}; | |
407 | ||
408 | for (dp = cp; *dp; dp++) | |
409 | if (*dp == ':') | |
410 | i++; | |
411 | /* | |
412 | * i+2 where i is the number of colons in the path. | |
413 | * There are i+1 directories in the path plus we need | |
414 | * room for a zero terminator. | |
415 | */ | |
35371dec | 416 | pv = (char **) calloc((unsigned) (i + 2), sizeof (char **)); |
04d3b78c BJ |
417 | dp = cp; |
418 | i = 0; | |
419 | if (*dp) | |
420 | for (;;) { | |
421 | if ((c = *dp) == ':' || c == 0) { | |
422 | *dp = 0; | |
423 | pv[i++] = savestr(*cp ? cp : dot); | |
424 | if (c) { | |
425 | cp = dp + 1; | |
426 | *dp = ':'; | |
427 | } else | |
428 | break; | |
429 | } | |
430 | dp++; | |
431 | } | |
432 | pv[i] = 0; | |
433 | set1("path", pv, &shvhed); | |
434 | } | |
435 | ||
436 | /* | |
437 | * Source to the file which is the catenation of the argument names. | |
438 | */ | |
439 | srccat(cp, dp) | |
440 | char *cp, *dp; | |
441 | { | |
442 | register char *ep = strspl(cp, dp); | |
443 | register int unit = dmove(open(ep, 0), -1); | |
444 | ||
35371dec | 445 | (void) ioctl(unit, FIOCLEX, (char *)0); |
04d3b78c | 446 | xfree(ep); |
1274df0a | 447 | srcunit(unit, mflag ? 0 : 1, 0); |
04d3b78c BJ |
448 | } |
449 | ||
450 | /* | |
1274df0a KB |
451 | * Source to a unit. |
452 | * This occurs on ".cshrc"s and the like. | |
04d3b78c | 453 | */ |
470cb5e7 KB |
454 | int insource; |
455 | static | |
d7929fa7 | 456 | srcunit(unit, onlyown, hflg) |
04d3b78c | 457 | register int unit; |
1274df0a | 458 | bool onlyown, hflg; |
04d3b78c BJ |
459 | { |
460 | /* We have to push down a lot of state here */ | |
461 | /* All this could go into a structure */ | |
462 | int oSHIN = -1, oldintty = intty; | |
463 | struct whyle *oldwhyl = whyles; | |
464 | char *ogointr = gointr, *oarginp = arginp; | |
465 | char *oevalp = evalp, **oevalvec = evalvec; | |
466 | int oonelflg = onelflg; | |
d7929fa7 KM |
467 | bool oenterhist = enterhist; |
468 | char OHIST = HIST; | |
04d3b78c BJ |
469 | #ifdef TELL |
470 | bool otell = cantell; | |
471 | #endif | |
472 | struct Bin saveB; | |
473 | ||
474 | /* The (few) real local variables */ | |
475 | jmp_buf oldexit; | |
1f7b623f KB |
476 | int reenter; |
477 | long omask; | |
04d3b78c BJ |
478 | |
479 | if (unit < 0) | |
480 | return; | |
481 | if (didfds) | |
482 | donefds(); | |
483 | if (onlyown) { | |
484 | struct stat stb; | |
485 | ||
ec1a81af SL |
486 | if (fstat(unit, &stb) < 0 || |
487 | (stb.st_uid != uid && stb.st_gid != getgid())) { | |
35371dec | 488 | (void) close(unit); |
04d3b78c BJ |
489 | return; |
490 | } | |
491 | } | |
492 | ||
493 | /* | |
494 | * There is a critical section here while we are pushing down the | |
495 | * input stream since we have stuff in different structures. | |
496 | * If we weren't careful an interrupt could corrupt SHIN's Bin | |
497 | * structure and kill the shell. | |
498 | * | |
499 | * We could avoid the critical region by grouping all the stuff | |
500 | * in a single structure and pointing at it to move it all at | |
501 | * once. This is less efficient globally on many variable references | |
502 | * however. | |
503 | */ | |
470cb5e7 | 504 | insource = 1; |
04d3b78c BJ |
505 | getexit(oldexit); |
506 | reenter = 0; | |
507 | if (setintr) | |
d33af40e | 508 | omask = sigblock(sigmask(SIGINT)); |
04d3b78c BJ |
509 | setexit(); |
510 | reenter++; | |
511 | if (reenter == 1) { | |
512 | /* Setup the new values of the state stuff saved above */ | |
513 | copy((char *)&saveB, (char *)&B, sizeof saveB); | |
514 | fbuf = (char **) 0; | |
515 | fseekp = feobp = fblocks = 0; | |
516 | oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0; | |
517 | intty = isatty(SHIN), whyles = 0, gointr = 0; | |
518 | evalvec = 0; evalp = 0; | |
d7929fa7 KM |
519 | enterhist = hflg; |
520 | if (enterhist) | |
521 | HIST = '\0'; | |
04d3b78c BJ |
522 | /* |
523 | * Now if we are allowing commands to be interrupted, | |
524 | * we let ourselves be interrupted. | |
525 | */ | |
526 | if (setintr) | |
35371dec | 527 | (void) sigsetmask(omask); |
04d3b78c BJ |
528 | #ifdef TELL |
529 | settell(); | |
530 | #endif | |
531 | process(0); /* 0 -> blow away on errors */ | |
532 | } | |
533 | if (setintr) | |
35371dec | 534 | (void) sigsetmask(omask); |
04d3b78c BJ |
535 | if (oSHIN >= 0) { |
536 | register int i; | |
537 | ||
538 | /* We made it to the new state... free up its storage */ | |
539 | /* This code could get run twice but xfree doesn't care */ | |
540 | for (i = 0; i < fblocks; i++) | |
541 | xfree(fbuf[i]); | |
542 | xfree((char *)fbuf); | |
543 | ||
544 | /* Reset input arena */ | |
545 | copy((char *)&B, (char *)&saveB, sizeof B); | |
546 | ||
35371dec | 547 | (void) close(SHIN), SHIN = oSHIN; |
04d3b78c BJ |
548 | arginp = oarginp, onelflg = oonelflg; |
549 | evalp = oevalp, evalvec = oevalvec; | |
550 | intty = oldintty, whyles = oldwhyl, gointr = ogointr; | |
020d9a25 KM |
551 | if (enterhist) |
552 | HIST = OHIST; | |
d7929fa7 | 553 | enterhist = oenterhist; |
04d3b78c BJ |
554 | #ifdef TELL |
555 | cantell = otell; | |
556 | #endif | |
557 | } | |
558 | ||
559 | resexit(oldexit); | |
560 | /* | |
561 | * If process reset() (effectively an unwind) then | |
562 | * we must also unwind. | |
563 | */ | |
564 | if (reenter >= 2) | |
565 | error(NOSTR); | |
470cb5e7 | 566 | insource = 0; |
04d3b78c BJ |
567 | } |
568 | ||
d7929fa7 | 569 | rechist() |
04d3b78c | 570 | { |
63af20f7 KM |
571 | char buf[BUFSIZ]; |
572 | int fp, ftmp, oldidfds; | |
04d3b78c | 573 | |
d7929fa7 | 574 | if (!fast) { |
6ea8dfee KM |
575 | if (value("savehist")[0] == '\0') |
576 | return; | |
35371dec EW |
577 | (void) strcpy(buf, value("home")); |
578 | (void) strcat(buf, "/.history"); | |
14f52162 | 579 | fp = creat(buf, 0666); |
6ea8dfee KM |
580 | if (fp == -1) |
581 | return; | |
582 | oldidfds = didfds; | |
583 | didfds = 0; | |
584 | ftmp = SHOUT; | |
585 | SHOUT = fp; | |
35371dec | 586 | (void) strcpy(buf, value("savehist")); |
6ea8dfee KM |
587 | dumphist[2] = buf; |
588 | dohist(dumphist); | |
35371dec | 589 | (void) close(fp); |
6ea8dfee KM |
590 | SHOUT = ftmp; |
591 | didfds = oldidfds; | |
d7929fa7 KM |
592 | } |
593 | } | |
594 | ||
595 | goodbye() | |
596 | { | |
597 | if (loginsh) { | |
35371dec EW |
598 | (void) signal(SIGQUIT, SIG_IGN); |
599 | (void) signal(SIGINT, SIG_IGN); | |
600 | (void) signal(SIGTERM, SIG_IGN); | |
04d3b78c | 601 | setintr = 0; /* No interrupts after "logout" */ |
5fe577ad | 602 | srcunit(open(_PATH_DOTLOGOUT, O_RDONLY), 0, 0); |
04d3b78c BJ |
603 | if (adrof("home")) |
604 | srccat(value("home"), "/.logout"); | |
605 | } | |
d7929fa7 | 606 | rechist(); |
04d3b78c BJ |
607 | exitstat(); |
608 | } | |
609 | ||
610 | exitstat() | |
611 | { | |
612 | ||
35371dec EW |
613 | #ifdef PROF |
614 | monitor(0); | |
615 | #endif | |
04d3b78c BJ |
616 | /* |
617 | * Note that if STATUS is corrupted (i.e. getn bombs) | |
618 | * then error will exit directly because we poke child here. | |
619 | * Otherwise we might continue unwarrantedly (sic). | |
620 | */ | |
621 | child++; | |
622 | exit(getn(value("status"))); | |
623 | } | |
624 | ||
d7929fa7 KM |
625 | /* |
626 | * in the event of a HUP we want to save the history | |
627 | */ | |
628 | phup() | |
629 | { | |
630 | rechist(); | |
631 | exit(1); | |
632 | } | |
633 | ||
04d3b78c BJ |
634 | char *jobargv[2] = { "jobs", 0 }; |
635 | /* | |
636 | * Catch an interrupt, e.g. during lexical input. | |
637 | * If we are an interactive shell, we reset the interrupt catch | |
638 | * immediately. In any case we drain the shell output, | |
639 | * and finally go through the normal error mechanism, which | |
640 | * gets a chance to make the shell go away. | |
641 | */ | |
642 | pintr() | |
401149be BJ |
643 | { |
644 | pintr1(1); | |
645 | } | |
646 | ||
647 | pintr1(wantnl) | |
648 | bool wantnl; | |
04d3b78c BJ |
649 | { |
650 | register char **v; | |
1f7b623f | 651 | long omask; |
04d3b78c | 652 | |
1f7b623f | 653 | omask = sigblock(0L); |
04d3b78c | 654 | if (setintr) { |
35371dec | 655 | (void) sigsetmask(omask & ~sigmask(SIGINT)); |
04d3b78c BJ |
656 | if (pjobs) { |
657 | pjobs = 0; | |
658 | printf("\n"); | |
659 | dojobs(jobargv); | |
660 | bferr("Interrupted"); | |
661 | } | |
662 | } | |
35371dec | 663 | (void) sigsetmask(omask & ~sigmask(SIGCHLD)); |
04d3b78c BJ |
664 | draino(); |
665 | ||
666 | /* | |
667 | * If we have an active "onintr" then we search for the label. | |
668 | * Note that if one does "onintr -" then we shan't be interruptible | |
669 | * so we needn't worry about that here. | |
670 | */ | |
671 | if (gointr) { | |
672 | search(ZGOTO, 0, gointr); | |
673 | timflg = 0; | |
674 | if (v = pargv) | |
675 | pargv = 0, blkfree(v); | |
676 | if (v = gargv) | |
677 | gargv = 0, blkfree(v); | |
678 | reset(); | |
401149be | 679 | } else if (intty && wantnl) |
04d3b78c BJ |
680 | printf("\n"); /* Some like this, others don't */ |
681 | error(NOSTR); | |
682 | } | |
683 | ||
684 | /* | |
685 | * Process is the main driving routine for the shell. | |
686 | * It runs all command processing, except for those within { ... } | |
687 | * in expressions (which is run by a routine evalav in sh.exp.c which | |
688 | * is a stripped down process), and `...` evaluation which is run | |
689 | * also by a subset of this code in sh.glob.c in the routine backeval. | |
690 | * | |
691 | * The code here is a little strange because part of it is interruptible | |
692 | * and hence freeing of structures appears to occur when none is necessary | |
693 | * if this is ignored. | |
694 | * | |
695 | * Note that if catch is not set then we will unwind on any error. | |
696 | * If an end-of-file occurs, we return. | |
697 | */ | |
698 | process(catch) | |
699 | bool catch; | |
700 | { | |
04d3b78c | 701 | jmp_buf osetexit; |
35371dec | 702 | register struct command *t; |
04d3b78c BJ |
703 | |
704 | getexit(osetexit); | |
705 | for (;;) { | |
706 | pendjob(); | |
707 | paraml.next = paraml.prev = ¶ml; | |
708 | paraml.word = ""; | |
709 | t = 0; | |
710 | setexit(); | |
63af20f7 | 711 | justpr = enterhist; /* execute if not entering history */ |
04d3b78c BJ |
712 | |
713 | /* | |
714 | * Interruptible during interactive reads | |
715 | */ | |
716 | if (setintr) | |
1f7b623f | 717 | (void) sigsetmask(sigblock(0L) & ~sigmask(SIGINT)); |
04d3b78c BJ |
718 | |
719 | /* | |
720 | * For the sake of reset() | |
721 | */ | |
722 | freelex(¶ml), freesyn(t), t = 0; | |
723 | ||
724 | if (haderr) { | |
725 | if (!catch) { | |
726 | /* unwind */ | |
727 | doneinp = 0; | |
728 | resexit(osetexit); | |
729 | reset(); | |
730 | } | |
731 | haderr = 0; | |
732 | /* | |
733 | * Every error is eventually caught here or | |
734 | * the shell dies. It is at this | |
735 | * point that we clean up any left-over open | |
736 | * files, by closing all but a fixed number | |
737 | * of pre-defined files. Thus routines don't | |
738 | * have to worry about leaving files open due | |
739 | * to deeper errors... they will get closed here. | |
740 | */ | |
741 | closem(); | |
742 | continue; | |
743 | } | |
744 | if (doneinp) { | |
745 | doneinp = 0; | |
746 | break; | |
747 | } | |
748 | if (chkstop) | |
749 | chkstop--; | |
750 | if (neednote) | |
751 | pnote(); | |
c9166193 | 752 | if (intty && prompt && evalvec == 0) { |
04d3b78c BJ |
753 | mailchk(); |
754 | /* | |
755 | * If we are at the end of the input buffer | |
756 | * then we are going to read fresh stuff. | |
757 | * Otherwise, we are rereading input and don't | |
758 | * need or want to prompt. | |
759 | */ | |
760 | if (fseekp == feobp) | |
544d4ed6 | 761 | printprompt(); |
04d3b78c BJ |
762 | } |
763 | err = 0; | |
764 | ||
765 | /* | |
766 | * Echo not only on VERBOSE, but also with history expansion. | |
767 | * If there is a lexical error then we forego history echo. | |
768 | */ | |
d7929fa7 KM |
769 | if (lex(¶ml) && !err && intty || |
770 | adrof("verbose")) { | |
04d3b78c BJ |
771 | haderr = 1; |
772 | prlex(¶ml); | |
773 | haderr = 0; | |
774 | } | |
775 | ||
776 | /* | |
777 | * The parser may lose space if interrupted. | |
778 | */ | |
779 | if (setintr) | |
35371dec | 780 | (void) sigblock(sigmask(SIGINT)); |
04d3b78c BJ |
781 | |
782 | /* | |
63af20f7 KM |
783 | * Save input text on the history list if |
784 | * reading in old history, or it | |
04d3b78c BJ |
785 | * is from the terminal at the top level and not |
786 | * in a loop. | |
787 | */ | |
63af20f7 | 788 | if (enterhist || catch && intty && !whyles) |
04d3b78c BJ |
789 | savehist(¶ml); |
790 | ||
791 | /* | |
d7929fa7 KM |
792 | * Print lexical error messages, except when sourcing |
793 | * history lists. | |
04d3b78c | 794 | */ |
d7929fa7 | 795 | if (!enterhist && err) |
04d3b78c BJ |
796 | error(err); |
797 | ||
798 | /* | |
799 | * If had a history command :p modifier then | |
800 | * this is as far as we should go | |
801 | */ | |
802 | if (justpr) | |
803 | reset(); | |
804 | ||
805 | alias(¶ml); | |
806 | ||
807 | /* | |
808 | * Parse the words of the input into a parse tree. | |
809 | */ | |
810 | t = syntax(paraml.next, ¶ml, 0); | |
811 | if (err) | |
812 | error(err); | |
813 | ||
814 | /* | |
815 | * Execute the parse tree | |
816 | */ | |
817 | execute(t, tpgrp); | |
818 | ||
819 | /* | |
820 | * Made it! | |
821 | */ | |
822 | freelex(¶ml), freesyn(t); | |
823 | } | |
824 | resexit(osetexit); | |
825 | } | |
826 | ||
827 | dosource(t) | |
828 | register char **t; | |
829 | { | |
830 | register char *f; | |
831 | register int u; | |
d7929fa7 KM |
832 | bool hflg = 0; |
833 | char buf[BUFSIZ]; | |
04d3b78c BJ |
834 | |
835 | t++; | |
d7929fa7 KM |
836 | if (*t && eq(*t, "-h")) { |
837 | t++; | |
838 | hflg++; | |
839 | } | |
35371dec | 840 | (void) strcpy(buf, *t); |
d7929fa7 | 841 | f = globone(buf); |
04d3b78c BJ |
842 | u = dmove(open(f, 0), -1); |
843 | xfree(f); | |
d7929fa7 | 844 | if (u < 0 && !hflg) |
04d3b78c | 845 | Perror(f); |
35371dec | 846 | (void) ioctl(u, FIOCLEX, (char *)0); |
d7929fa7 | 847 | srcunit(u, 0, hflg); |
04d3b78c BJ |
848 | } |
849 | ||
850 | /* | |
851 | * Check for mail. | |
852 | * If we are a login shell, then we don't want to tell | |
853 | * about any mail file unless its been modified | |
854 | * after the time we started. | |
855 | * This prevents us from telling the user things he already | |
856 | * knows, since the login program insists on saying | |
857 | * "You have mail." | |
858 | */ | |
859 | mailchk() | |
860 | { | |
861 | register struct varent *v; | |
862 | register char **vp; | |
863 | time_t t; | |
864 | int intvl, cnt; | |
865 | struct stat stb; | |
866 | bool new; | |
867 | ||
868 | v = adrof("mail"); | |
869 | if (v == 0) | |
870 | return; | |
35371dec | 871 | (void) time(&t); |
04d3b78c BJ |
872 | vp = v->vec; |
873 | cnt = blklen(vp); | |
874 | intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL; | |
875 | if (intvl < 1) | |
876 | intvl = 1; | |
877 | if (chktim + intvl > t) | |
878 | return; | |
879 | for (; *vp; vp++) { | |
880 | if (stat(*vp, &stb) < 0) | |
881 | continue; | |
ae3d9709 | 882 | new = stb.st_mtime > time0.tv_sec; |
04d3b78c BJ |
883 | if (stb.st_size == 0 || stb.st_atime > stb.st_mtime || |
884 | (stb.st_atime < chktim && stb.st_mtime < chktim) || | |
885 | loginsh && !new) | |
886 | continue; | |
887 | if (cnt == 1) | |
888 | printf("You have %smail.\n", new ? "new " : ""); | |
889 | else | |
890 | printf("%s in %s.\n", new ? "New mail" : "Mail", *vp); | |
891 | } | |
892 | chktim = t; | |
893 | } | |
894 | ||
895 | #include <pwd.h> | |
896 | /* | |
897 | * Extract a home directory from the password file | |
898 | * The argument points to a buffer where the name of the | |
899 | * user whose home directory is sought is currently. | |
900 | * We write the home directory of the user back there. | |
901 | */ | |
902 | gethdir(home) | |
903 | char *home; | |
904 | { | |
905 | register struct passwd *pp = getpwnam(home); | |
906 | ||
907 | if (pp == 0) | |
908 | return (1); | |
35371dec | 909 | (void) strcpy(home, pp->pw_dir); |
04d3b78c BJ |
910 | return (0); |
911 | } | |
912 | ||
913 | /* | |
914 | * Move the initial descriptors to their eventual | |
915 | * resting places, closin all other units. | |
916 | */ | |
917 | initdesc() | |
918 | { | |
919 | ||
04d3b78c | 920 | didfds = 0; /* 0, 1, 2 aren't set up */ |
35371dec EW |
921 | (void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, (char *)0); |
922 | (void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, (char *)0); | |
923 | (void) ioctl(SHDIAG = dcopy(2, FSHDIAG), FIOCLEX, (char *)0); | |
924 | (void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, (char *)0); | |
04d3b78c BJ |
925 | closem(); |
926 | } | |
927 | ||
e31125a2 SL |
928 | #ifdef PROF |
929 | done(i) | |
930 | #else | |
04d3b78c | 931 | exit(i) |
e31125a2 | 932 | #endif |
04d3b78c BJ |
933 | int i; |
934 | { | |
935 | ||
936 | untty(); | |
04d3b78c | 937 | _exit(i); |
04d3b78c | 938 | } |
19d39288 | 939 | |
544d4ed6 | 940 | printprompt() |
19d39288 | 941 | { |
544d4ed6 SL |
942 | register char *cp; |
943 | ||
e31125a2 | 944 | if (!whyles) { |
544d4ed6 SL |
945 | for (cp = value("prompt"); *cp; cp++) |
946 | if (*cp == HIST) | |
947 | printf("%d", eventno + 1); | |
948 | else { | |
949 | if (*cp == '\\' && cp[1] == HIST) | |
950 | cp++; | |
fad613b5 | 951 | cshputchar(*cp | QUOTE); |
544d4ed6 SL |
952 | } |
953 | } else | |
954 | /* | |
955 | * Prompt for forward reading loop | |
956 | * body content. | |
957 | */ | |
958 | printf("? "); | |
959 | flush(); | |
19d39288 | 960 | } |