Commit | Line | Data |
---|---|---|
f0bb61e3 | 1 | static char *sccsid = "@(#)csh.c 4.19 %G%"; |
04d3b78c BJ |
2 | |
3 | #include "sh.h" | |
4 | #include <sys/ioctl.h> | |
5 | /* | |
6 | * C Shell | |
7 | * | |
8 | * Bill Joy, UC Berkeley, California, USA | |
9 | * October 1978, May 1980 | |
10 | * | |
11 | * Jim Kulp, IIASA, Laxenburg, Austria | |
12 | * April 1980 | |
13 | */ | |
14 | ||
15 | char *pathlist[] = { ".", "/usr/ucb", "/bin", "/usr/bin", 0 }; | |
6ea8dfee | 16 | char *dumphist[] = { "history", "-h", 0, 0 }; |
d7929fa7 | 17 | char *loadhist[] = { "source", "-h", "~/.history", 0 }; |
04d3b78c BJ |
18 | char HIST = '!'; |
19 | char HISTSUB = '^'; | |
20 | bool nofile; | |
21 | bool reenter; | |
22 | bool nverbose; | |
23 | bool nexececho; | |
24 | bool quitit; | |
25 | bool fast; | |
f0bb61e3 | 26 | bool batch; |
04d3b78c | 27 | bool prompt = 1; |
63af20f7 | 28 | bool enterhist = 0; |
04d3b78c BJ |
29 | |
30 | main(c, av) | |
31 | int c; | |
32 | char **av; | |
33 | { | |
34 | register char **v, *cp; | |
35 | register int f; | |
d33af40e | 36 | struct sigvec osv; |
04d3b78c BJ |
37 | |
38 | settimes(); /* Immed. estab. timing base */ | |
39 | v = av; | |
40 | if (eq(v[0], "a.out")) /* A.out's are quittable */ | |
41 | quitit = 1; | |
42 | uid = getuid(); | |
d33af40e | 43 | loginsh = **v == '-' && c == 1; |
04d3b78c BJ |
44 | if (loginsh) |
45 | time(&chktim); | |
46 | ||
47 | /* | |
48 | * Move the descriptors to safe places. | |
49 | * The variable didfds is 0 while we have only FSH* to work with. | |
50 | * When didfds is true, we have 0,1,2 and prefer to use these. | |
51 | */ | |
52 | initdesc(); | |
53 | ||
54 | /* | |
55 | * Initialize the shell variables. | |
56 | * ARGV and PROMPT are initialized later. | |
57 | * STATUS is also munged in several places. | |
58 | * CHILD is munged when forking/waiting | |
59 | */ | |
60 | ||
61 | set("status", "0"); | |
62 | dinit(cp = getenv("HOME")); /* dinit thinks that HOME == cwd in a | |
63 | * login shell */ | |
64 | if (cp == NOSTR) | |
65 | fast++; /* No home -> can't read scripts */ | |
66 | else | |
67 | set("home", savestr(cp)); | |
68 | /* | |
69 | * Grab other useful things from the environment. | |
70 | * Should we grab everything?? | |
71 | */ | |
72 | if ((cp = getenv("USER")) != NOSTR) | |
73 | set("user", savestr(cp)); | |
74 | if ((cp = getenv("TERM")) != NOSTR) | |
75 | set("term", savestr(cp)); | |
76 | /* | |
77 | * Re-initialize path if set in environment | |
78 | */ | |
79 | if ((cp = getenv("PATH")) == NOSTR) | |
80 | set1("path", saveblk(pathlist), &shvhed); | |
81 | else { | |
82 | register unsigned i = 0; | |
83 | register char *dp; | |
84 | register char **pv; | |
85 | ||
86 | for (dp = cp; *dp; dp++) | |
87 | if (*dp == ':') | |
88 | i++; | |
89 | pv = (char **)calloc(i+2, sizeof (char **)); | |
90 | for (dp = cp, i = 0; ;) | |
91 | if (*dp == ':') { | |
92 | *dp = 0; | |
93 | pv[i++] = savestr(*cp ? cp : "."); | |
94 | *dp++ = ':'; | |
95 | cp = dp; | |
96 | } else if (*dp++ == 0) { | |
97 | pv[i++] = savestr(*cp ? cp : "."); | |
98 | break; | |
99 | } | |
100 | pv[i] = 0; | |
101 | set1("path", pv, &shvhed); | |
102 | } | |
103 | set("shell", SHELLPATH); | |
104 | ||
105 | doldol = putn(getpid()); /* For $$ */ | |
106 | shtemp = strspl("/tmp/sh", doldol); /* For << */ | |
107 | ||
108 | /* | |
109 | * Record the interrupt states from the parent process. | |
110 | * If the parent is non-interruptible our hand must be forced | |
111 | * or we (and our children) won't be either. | |
112 | * Our children inherit termination from our parent. | |
113 | * We catch it only if we are the login shell. | |
114 | */ | |
d33af40e RC |
115 | sigvec(SIGINT, 0, &osv); /* parents interruptibility */ |
116 | parintr = osv.sv_handler; | |
117 | sigvec(SIGTERM, 0, &osv); /* parents terminability */ | |
118 | parterm = osv.sv_handler; | |
f66d6be5 | 119 | if (loginsh) { |
d7929fa7 | 120 | signal(SIGHUP, phup); /* exit processing on HUP */ |
f66d6be5 KM |
121 | signal(SIGXCPU, phup); /* ...and on XCPU */ |
122 | signal(SIGXFSZ, phup); /* ...and on XFSZ */ | |
123 | } | |
04d3b78c BJ |
124 | |
125 | /* | |
126 | * Process the arguments. | |
127 | * | |
128 | * Note that processing of -v/-x is actually delayed till after | |
129 | * script processing. | |
04d3b78c BJ |
130 | */ |
131 | c--, v++; | |
f0bb61e3 | 132 | while (c > 0 && (cp = v[0])[0] == '-' && *++cp != '\0' && !batch) { |
04d3b78c BJ |
133 | do switch (*cp++) { |
134 | ||
f0bb61e3 RC |
135 | case 'b': /* -b Next arg is input file */ |
136 | batch++; | |
137 | break; | |
138 | ||
04d3b78c BJ |
139 | case 'c': /* -c Command input from arg */ |
140 | if (c == 1) | |
141 | exit(0); | |
142 | c--, v++; | |
143 | arginp = v[0]; | |
144 | prompt = 0; | |
145 | nofile++; | |
146 | break; | |
147 | ||
148 | case 'e': /* -e Exit on any error */ | |
149 | exiterr++; | |
150 | break; | |
151 | ||
152 | case 'f': /* -f Fast start */ | |
153 | fast++; | |
154 | break; | |
155 | ||
156 | case 'i': /* -i Interactive, even if !intty */ | |
157 | intact++; | |
158 | nofile++; | |
159 | break; | |
160 | ||
161 | case 'n': /* -n Don't execute */ | |
162 | noexec++; | |
163 | break; | |
164 | ||
165 | case 'q': /* -q (Undoc'd) ... die on quit */ | |
166 | quitit = 1; | |
167 | break; | |
168 | ||
169 | case 's': /* -s Read from std input */ | |
170 | nofile++; | |
171 | break; | |
172 | ||
173 | case 't': /* -t Read one line from input */ | |
174 | onelflg = 2; | |
175 | prompt = 0; | |
176 | nofile++; | |
177 | break; | |
178 | ||
179 | case 'v': /* -v Echo hist expanded input */ | |
180 | nverbose = 1; /* ... later */ | |
181 | break; | |
182 | ||
183 | case 'x': /* -x Echo just before execution */ | |
184 | nexececho = 1; /* ... later */ | |
185 | break; | |
186 | ||
187 | case 'V': /* -V Echo hist expanded input */ | |
188 | setNS("verbose"); /* NOW! */ | |
189 | break; | |
190 | ||
191 | case 'X': /* -X Echo just before execution */ | |
192 | setNS("echo"); /* NOW! */ | |
193 | break; | |
194 | ||
195 | } while (*cp); | |
196 | v++, c--; | |
197 | } | |
f0bb61e3 | 198 | argsdone: |
04d3b78c BJ |
199 | |
200 | if (quitit) /* With all due haste, for debugging */ | |
201 | signal(SIGQUIT, SIG_DFL); | |
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 */ | |
216 | prompt = 0; | |
217 | c--, v++; | |
218 | } | |
f0bb61e3 RC |
219 | if (uid != geteuid() && !batch) { |
220 | errno = EACCES; | |
221 | child++; /* So this ... */ | |
222 | Perror("csh"); /* ... doesn't return */ | |
223 | } | |
04d3b78c BJ |
224 | /* |
225 | * Consider input a tty if it really is or we are interactive. | |
226 | */ | |
227 | intty = intact || isatty(SHIN); | |
228 | /* | |
229 | * Decide whether we should play with signals or not. | |
230 | * If we are explicitly told (via -i, or -) or we are a login | |
231 | * shell (arg0 starts with -) or the input and output are both | |
232 | * the ttys("csh", or "csh</dev/ttyx>/dev/ttyx") | |
233 | * Note that in only the login shell is it likely that parent | |
234 | * may have set signals to be ignored | |
235 | */ | |
3b1a0a1e | 236 | if (loginsh || intact || intty && isatty(SHOUT)) |
04d3b78c BJ |
237 | setintr = 1; |
238 | #ifdef TELL | |
239 | settell(); | |
240 | #endif | |
241 | /* | |
242 | * Save the remaining arguments in argv. | |
243 | */ | |
244 | setq("argv", v, &shvhed); | |
245 | ||
246 | /* | |
247 | * Set up the prompt. | |
248 | */ | |
249 | if (prompt) | |
250 | set("prompt", uid == 0 ? "# " : "% "); | |
251 | ||
252 | /* | |
253 | * If we are an interactive shell, then start fiddling | |
254 | * with the signals; this is a tricky game. | |
255 | */ | |
256 | shpgrp = getpgrp(0); | |
257 | opgrp = tpgrp = -1; | |
258 | oldisc = -1; | |
259 | if (setintr) { | |
260 | **av = '-'; | |
261 | if (!quitit) /* Wary! */ | |
262 | signal(SIGQUIT, SIG_IGN); | |
d33af40e RC |
263 | signal(SIGINT, pintr); |
264 | sigblock(sigmask(SIGINT)); | |
04d3b78c BJ |
265 | signal(SIGTERM, SIG_IGN); |
266 | if (quitit == 0 && arginp == 0) { | |
267 | signal(SIGTSTP, SIG_IGN); | |
268 | signal(SIGTTIN, SIG_IGN); | |
269 | signal(SIGTTOU, SIG_IGN); | |
270 | /* | |
271 | * Wait till in foreground, in case someone | |
272 | * stupidly runs | |
273 | * csh & | |
274 | * dont want to try to grab away the tty. | |
275 | */ | |
276 | if (isatty(FSHDIAG)) | |
277 | f = FSHDIAG; | |
278 | else if (isatty(FSHOUT)) | |
279 | f = FSHOUT; | |
280 | else if (isatty(OLDSTD)) | |
281 | f = OLDSTD; | |
282 | else | |
283 | f = -1; | |
284 | retry: | |
285 | if (ioctl(f, TIOCGPGRP, &tpgrp) == 0 && tpgrp != -1) { | |
286 | int ldisc; | |
287 | if (tpgrp != shpgrp) { | |
d33af40e | 288 | int (*old)() = signal(SIGTTIN, SIG_DFL); |
04d3b78c | 289 | kill(0, SIGTTIN); |
d33af40e | 290 | signal(SIGTTIN, old); |
04d3b78c BJ |
291 | goto retry; |
292 | } | |
293 | if (ioctl(f, TIOCGETD, &oldisc) != 0) | |
294 | goto notty; | |
295 | if (oldisc != NTTYDISC) { | |
d7929fa7 KM |
296 | #ifdef DEBUG |
297 | printf("Switching to new tty driver...\n"); | |
298 | #endif DEBUG | |
04d3b78c BJ |
299 | ldisc = NTTYDISC; |
300 | ioctl(f, TIOCSETD, &ldisc); | |
301 | } else | |
302 | oldisc = -1; | |
303 | opgrp = shpgrp; | |
304 | shpgrp = getpid(); | |
305 | tpgrp = shpgrp; | |
306 | ioctl(f, TIOCSPGRP, &shpgrp); | |
307 | setpgrp(0, shpgrp); | |
308 | dcopy(f, FSHTTY); | |
309 | ioctl(FSHTTY, FIOCLEX, 0); | |
310 | } else { | |
311 | notty: | |
312 | printf("Warning: no access to tty; thus no job control in this shell...\n"); | |
313 | tpgrp = -1; | |
314 | } | |
315 | } | |
316 | } | |
3b1a0a1e KM |
317 | if (setintr == 0 && parintr == SIG_DFL) |
318 | setintr++; | |
d33af40e | 319 | signal(SIGCHLD, pchild); /* while signals not ready */ |
04d3b78c BJ |
320 | |
321 | /* | |
322 | * Set an exit here in case of an interrupt or error reading | |
323 | * the shell start-up scripts. | |
324 | */ | |
325 | setexit(); | |
326 | haderr = 0; /* In case second time through */ | |
327 | if (!fast && reenter == 0) { | |
328 | reenter++; | |
329 | /* Will have value("home") here because set fast if don't */ | |
330 | srccat(value("home"), "/.cshrc"); | |
331 | if (!fast && !arginp && !onelflg) | |
332 | dohash(); | |
d7929fa7 | 333 | dosource(loadhist); |
04d3b78c | 334 | if (loginsh) { |
04d3b78c BJ |
335 | srccat(value("home"), "/.login"); |
336 | } | |
337 | } | |
338 | ||
339 | /* | |
340 | * Now are ready for the -v and -x flags | |
341 | */ | |
342 | if (nverbose) | |
343 | setNS("verbose"); | |
344 | if (nexececho) | |
345 | setNS("echo"); | |
346 | ||
347 | /* | |
348 | * All the rest of the world is inside this call. | |
349 | * The argument to process indicates whether it should | |
350 | * catch "error unwinds". Thus if we are a interactive shell | |
351 | * our call here will never return by being blown past on an error. | |
352 | */ | |
353 | process(setintr); | |
354 | ||
355 | /* | |
356 | * Mop-up. | |
357 | */ | |
358 | if (loginsh) { | |
359 | printf("logout\n"); | |
360 | close(SHIN); | |
361 | child++; | |
362 | goodbye(); | |
363 | } | |
d7929fa7 | 364 | rechist(); |
04d3b78c BJ |
365 | exitstat(); |
366 | } | |
367 | ||
368 | untty() | |
369 | { | |
370 | ||
371 | if (tpgrp > 0) { | |
372 | setpgrp(0, opgrp); | |
373 | ioctl(FSHTTY, TIOCSPGRP, &opgrp); | |
374 | if (oldisc != -1 && oldisc != NTTYDISC) { | |
d7929fa7 | 375 | #ifdef DEBUG |
04d3b78c | 376 | printf("\nReverting to old tty driver...\n"); |
d7929fa7 | 377 | #endif DEBUG |
04d3b78c BJ |
378 | ioctl(FSHTTY, TIOCSETD, &oldisc); |
379 | } | |
380 | } | |
381 | } | |
382 | ||
383 | importpath(cp) | |
ec1a81af | 384 | char *cp; |
04d3b78c BJ |
385 | { |
386 | register int i = 0; | |
387 | register char *dp; | |
388 | register char **pv; | |
389 | int c; | |
390 | static char dot[2] = {'.', 0}; | |
391 | ||
392 | for (dp = cp; *dp; dp++) | |
393 | if (*dp == ':') | |
394 | i++; | |
395 | /* | |
396 | * i+2 where i is the number of colons in the path. | |
397 | * There are i+1 directories in the path plus we need | |
398 | * room for a zero terminator. | |
399 | */ | |
400 | pv = (char **) calloc(i+2, sizeof (char **)); | |
401 | dp = cp; | |
402 | i = 0; | |
403 | if (*dp) | |
404 | for (;;) { | |
405 | if ((c = *dp) == ':' || c == 0) { | |
406 | *dp = 0; | |
407 | pv[i++] = savestr(*cp ? cp : dot); | |
408 | if (c) { | |
409 | cp = dp + 1; | |
410 | *dp = ':'; | |
411 | } else | |
412 | break; | |
413 | } | |
414 | dp++; | |
415 | } | |
416 | pv[i] = 0; | |
417 | set1("path", pv, &shvhed); | |
418 | } | |
419 | ||
420 | /* | |
421 | * Source to the file which is the catenation of the argument names. | |
422 | */ | |
423 | srccat(cp, dp) | |
424 | char *cp, *dp; | |
425 | { | |
426 | register char *ep = strspl(cp, dp); | |
427 | register int unit = dmove(open(ep, 0), -1); | |
428 | ||
429 | /* ioctl(unit, FIOCLEX, NULL); */ | |
430 | xfree(ep); | |
431 | #ifdef INGRES | |
d7929fa7 | 432 | srcunit(unit, 0, 0); |
04d3b78c | 433 | #else |
d7929fa7 | 434 | srcunit(unit, 1, 0); |
04d3b78c BJ |
435 | #endif |
436 | } | |
437 | ||
438 | /* | |
439 | * Source to a unit. If onlyown it must be our file or our group or | |
440 | * we don't chance it. This occurs on ".cshrc"s and the like. | |
441 | */ | |
d7929fa7 | 442 | srcunit(unit, onlyown, hflg) |
04d3b78c BJ |
443 | register int unit; |
444 | bool onlyown; | |
d7929fa7 | 445 | bool hflg; |
04d3b78c BJ |
446 | { |
447 | /* We have to push down a lot of state here */ | |
448 | /* All this could go into a structure */ | |
449 | int oSHIN = -1, oldintty = intty; | |
450 | struct whyle *oldwhyl = whyles; | |
451 | char *ogointr = gointr, *oarginp = arginp; | |
452 | char *oevalp = evalp, **oevalvec = evalvec; | |
453 | int oonelflg = onelflg; | |
d7929fa7 KM |
454 | bool oenterhist = enterhist; |
455 | char OHIST = HIST; | |
04d3b78c BJ |
456 | #ifdef TELL |
457 | bool otell = cantell; | |
458 | #endif | |
459 | struct Bin saveB; | |
460 | ||
461 | /* The (few) real local variables */ | |
462 | jmp_buf oldexit; | |
d33af40e | 463 | int reenter, omask; |
04d3b78c BJ |
464 | |
465 | if (unit < 0) | |
466 | return; | |
467 | if (didfds) | |
468 | donefds(); | |
469 | if (onlyown) { | |
470 | struct stat stb; | |
471 | ||
ec1a81af SL |
472 | if (fstat(unit, &stb) < 0 || |
473 | (stb.st_uid != uid && stb.st_gid != getgid())) { | |
04d3b78c BJ |
474 | close(unit); |
475 | return; | |
476 | } | |
477 | } | |
478 | ||
479 | /* | |
480 | * There is a critical section here while we are pushing down the | |
481 | * input stream since we have stuff in different structures. | |
482 | * If we weren't careful an interrupt could corrupt SHIN's Bin | |
483 | * structure and kill the shell. | |
484 | * | |
485 | * We could avoid the critical region by grouping all the stuff | |
486 | * in a single structure and pointing at it to move it all at | |
487 | * once. This is less efficient globally on many variable references | |
488 | * however. | |
489 | */ | |
490 | getexit(oldexit); | |
491 | reenter = 0; | |
492 | if (setintr) | |
d33af40e | 493 | omask = sigblock(sigmask(SIGINT)); |
04d3b78c BJ |
494 | setexit(); |
495 | reenter++; | |
496 | if (reenter == 1) { | |
497 | /* Setup the new values of the state stuff saved above */ | |
498 | copy((char *)&saveB, (char *)&B, sizeof saveB); | |
499 | fbuf = (char **) 0; | |
500 | fseekp = feobp = fblocks = 0; | |
501 | oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0; | |
502 | intty = isatty(SHIN), whyles = 0, gointr = 0; | |
503 | evalvec = 0; evalp = 0; | |
d7929fa7 KM |
504 | enterhist = hflg; |
505 | if (enterhist) | |
506 | HIST = '\0'; | |
04d3b78c BJ |
507 | /* |
508 | * Now if we are allowing commands to be interrupted, | |
509 | * we let ourselves be interrupted. | |
510 | */ | |
511 | if (setintr) | |
d33af40e | 512 | sigsetmask(omask); |
04d3b78c BJ |
513 | #ifdef TELL |
514 | settell(); | |
515 | #endif | |
516 | process(0); /* 0 -> blow away on errors */ | |
517 | } | |
518 | if (setintr) | |
d33af40e | 519 | sigsetmask(omask); |
04d3b78c BJ |
520 | if (oSHIN >= 0) { |
521 | register int i; | |
522 | ||
523 | /* We made it to the new state... free up its storage */ | |
524 | /* This code could get run twice but xfree doesn't care */ | |
525 | for (i = 0; i < fblocks; i++) | |
526 | xfree(fbuf[i]); | |
527 | xfree((char *)fbuf); | |
528 | ||
529 | /* Reset input arena */ | |
530 | copy((char *)&B, (char *)&saveB, sizeof B); | |
531 | ||
532 | close(SHIN), SHIN = oSHIN; | |
533 | arginp = oarginp, onelflg = oonelflg; | |
534 | evalp = oevalp, evalvec = oevalvec; | |
535 | intty = oldintty, whyles = oldwhyl, gointr = ogointr; | |
020d9a25 KM |
536 | if (enterhist) |
537 | HIST = OHIST; | |
d7929fa7 | 538 | enterhist = oenterhist; |
04d3b78c BJ |
539 | #ifdef TELL |
540 | cantell = otell; | |
541 | #endif | |
542 | } | |
543 | ||
544 | resexit(oldexit); | |
545 | /* | |
546 | * If process reset() (effectively an unwind) then | |
547 | * we must also unwind. | |
548 | */ | |
549 | if (reenter >= 2) | |
550 | error(NOSTR); | |
551 | } | |
552 | ||
d7929fa7 | 553 | rechist() |
04d3b78c | 554 | { |
63af20f7 KM |
555 | char buf[BUFSIZ]; |
556 | int fp, ftmp, oldidfds; | |
04d3b78c | 557 | |
d7929fa7 | 558 | if (!fast) { |
6ea8dfee KM |
559 | if (value("savehist")[0] == '\0') |
560 | return; | |
63af20f7 KM |
561 | strcpy(buf, value("home")); |
562 | strcat(buf, "/.history"); | |
14f52162 | 563 | fp = creat(buf, 0666); |
6ea8dfee KM |
564 | if (fp == -1) |
565 | return; | |
566 | oldidfds = didfds; | |
567 | didfds = 0; | |
568 | ftmp = SHOUT; | |
569 | SHOUT = fp; | |
570 | strcpy(buf, value("savehist")); | |
571 | dumphist[2] = buf; | |
572 | dohist(dumphist); | |
573 | close(fp); | |
574 | SHOUT = ftmp; | |
575 | didfds = oldidfds; | |
d7929fa7 KM |
576 | } |
577 | } | |
578 | ||
579 | goodbye() | |
580 | { | |
581 | if (loginsh) { | |
04d3b78c | 582 | signal(SIGQUIT, SIG_IGN); |
d33af40e | 583 | signal(SIGINT, SIG_IGN); |
04d3b78c BJ |
584 | signal(SIGTERM, SIG_IGN); |
585 | setintr = 0; /* No interrupts after "logout" */ | |
586 | if (adrof("home")) | |
587 | srccat(value("home"), "/.logout"); | |
588 | } | |
d7929fa7 | 589 | rechist(); |
04d3b78c BJ |
590 | exitstat(); |
591 | } | |
592 | ||
593 | exitstat() | |
594 | { | |
595 | ||
596 | /* | |
597 | * Note that if STATUS is corrupted (i.e. getn bombs) | |
598 | * then error will exit directly because we poke child here. | |
599 | * Otherwise we might continue unwarrantedly (sic). | |
600 | */ | |
601 | child++; | |
602 | exit(getn(value("status"))); | |
603 | } | |
604 | ||
d7929fa7 KM |
605 | /* |
606 | * in the event of a HUP we want to save the history | |
607 | */ | |
608 | phup() | |
609 | { | |
610 | rechist(); | |
611 | exit(1); | |
612 | } | |
613 | ||
04d3b78c BJ |
614 | char *jobargv[2] = { "jobs", 0 }; |
615 | /* | |
616 | * Catch an interrupt, e.g. during lexical input. | |
617 | * If we are an interactive shell, we reset the interrupt catch | |
618 | * immediately. In any case we drain the shell output, | |
619 | * and finally go through the normal error mechanism, which | |
620 | * gets a chance to make the shell go away. | |
621 | */ | |
622 | pintr() | |
401149be BJ |
623 | { |
624 | pintr1(1); | |
625 | } | |
626 | ||
627 | pintr1(wantnl) | |
628 | bool wantnl; | |
04d3b78c BJ |
629 | { |
630 | register char **v; | |
d33af40e | 631 | int omask; |
04d3b78c | 632 | |
d33af40e | 633 | omask = sigblock(0); |
04d3b78c | 634 | if (setintr) { |
d33af40e | 635 | sigsetmask(omask & ~sigmask(SIGINT)); |
04d3b78c BJ |
636 | if (pjobs) { |
637 | pjobs = 0; | |
638 | printf("\n"); | |
639 | dojobs(jobargv); | |
640 | bferr("Interrupted"); | |
641 | } | |
642 | } | |
d33af40e | 643 | sigsetmask(omask & ~sigmask(SIGCHLD)); |
04d3b78c BJ |
644 | draino(); |
645 | ||
646 | /* | |
647 | * If we have an active "onintr" then we search for the label. | |
648 | * Note that if one does "onintr -" then we shan't be interruptible | |
649 | * so we needn't worry about that here. | |
650 | */ | |
651 | if (gointr) { | |
652 | search(ZGOTO, 0, gointr); | |
653 | timflg = 0; | |
654 | if (v = pargv) | |
655 | pargv = 0, blkfree(v); | |
656 | if (v = gargv) | |
657 | gargv = 0, blkfree(v); | |
658 | reset(); | |
401149be | 659 | } else if (intty && wantnl) |
04d3b78c BJ |
660 | printf("\n"); /* Some like this, others don't */ |
661 | error(NOSTR); | |
662 | } | |
663 | ||
664 | /* | |
665 | * Process is the main driving routine for the shell. | |
666 | * It runs all command processing, except for those within { ... } | |
667 | * in expressions (which is run by a routine evalav in sh.exp.c which | |
668 | * is a stripped down process), and `...` evaluation which is run | |
669 | * also by a subset of this code in sh.glob.c in the routine backeval. | |
670 | * | |
671 | * The code here is a little strange because part of it is interruptible | |
672 | * and hence freeing of structures appears to occur when none is necessary | |
673 | * if this is ignored. | |
674 | * | |
675 | * Note that if catch is not set then we will unwind on any error. | |
676 | * If an end-of-file occurs, we return. | |
677 | */ | |
678 | process(catch) | |
679 | bool catch; | |
680 | { | |
681 | register char *cp; | |
682 | jmp_buf osetexit; | |
683 | struct command *t; | |
684 | ||
685 | getexit(osetexit); | |
686 | for (;;) { | |
687 | pendjob(); | |
688 | paraml.next = paraml.prev = ¶ml; | |
689 | paraml.word = ""; | |
690 | t = 0; | |
691 | setexit(); | |
63af20f7 | 692 | justpr = enterhist; /* execute if not entering history */ |
04d3b78c BJ |
693 | |
694 | /* | |
695 | * Interruptible during interactive reads | |
696 | */ | |
697 | if (setintr) | |
d33af40e | 698 | sigsetmask(sigblock(0) & ~sigmask(SIGINT)); |
04d3b78c BJ |
699 | |
700 | /* | |
701 | * For the sake of reset() | |
702 | */ | |
703 | freelex(¶ml), freesyn(t), t = 0; | |
704 | ||
705 | if (haderr) { | |
706 | if (!catch) { | |
707 | /* unwind */ | |
708 | doneinp = 0; | |
709 | resexit(osetexit); | |
710 | reset(); | |
711 | } | |
712 | haderr = 0; | |
713 | /* | |
714 | * Every error is eventually caught here or | |
715 | * the shell dies. It is at this | |
716 | * point that we clean up any left-over open | |
717 | * files, by closing all but a fixed number | |
718 | * of pre-defined files. Thus routines don't | |
719 | * have to worry about leaving files open due | |
720 | * to deeper errors... they will get closed here. | |
721 | */ | |
722 | closem(); | |
723 | continue; | |
724 | } | |
725 | if (doneinp) { | |
726 | doneinp = 0; | |
727 | break; | |
728 | } | |
729 | if (chkstop) | |
730 | chkstop--; | |
731 | if (neednote) | |
732 | pnote(); | |
c9166193 | 733 | if (intty && prompt && evalvec == 0) { |
04d3b78c BJ |
734 | mailchk(); |
735 | /* | |
736 | * If we are at the end of the input buffer | |
737 | * then we are going to read fresh stuff. | |
738 | * Otherwise, we are rereading input and don't | |
739 | * need or want to prompt. | |
740 | */ | |
741 | if (fseekp == feobp) | |
544d4ed6 | 742 | printprompt(); |
04d3b78c BJ |
743 | flush(); |
744 | } | |
745 | err = 0; | |
746 | ||
747 | /* | |
748 | * Echo not only on VERBOSE, but also with history expansion. | |
749 | * If there is a lexical error then we forego history echo. | |
750 | */ | |
d7929fa7 KM |
751 | if (lex(¶ml) && !err && intty || |
752 | adrof("verbose")) { | |
04d3b78c BJ |
753 | haderr = 1; |
754 | prlex(¶ml); | |
755 | haderr = 0; | |
756 | } | |
757 | ||
758 | /* | |
759 | * The parser may lose space if interrupted. | |
760 | */ | |
761 | if (setintr) | |
d33af40e | 762 | sigblock(sigmask(SIGINT)); |
04d3b78c BJ |
763 | |
764 | /* | |
63af20f7 KM |
765 | * Save input text on the history list if |
766 | * reading in old history, or it | |
04d3b78c BJ |
767 | * is from the terminal at the top level and not |
768 | * in a loop. | |
769 | */ | |
63af20f7 | 770 | if (enterhist || catch && intty && !whyles) |
04d3b78c BJ |
771 | savehist(¶ml); |
772 | ||
773 | /* | |
d7929fa7 KM |
774 | * Print lexical error messages, except when sourcing |
775 | * history lists. | |
04d3b78c | 776 | */ |
d7929fa7 | 777 | if (!enterhist && err) |
04d3b78c BJ |
778 | error(err); |
779 | ||
780 | /* | |
781 | * If had a history command :p modifier then | |
782 | * this is as far as we should go | |
783 | */ | |
784 | if (justpr) | |
785 | reset(); | |
786 | ||
787 | alias(¶ml); | |
788 | ||
789 | /* | |
790 | * Parse the words of the input into a parse tree. | |
791 | */ | |
792 | t = syntax(paraml.next, ¶ml, 0); | |
793 | if (err) | |
794 | error(err); | |
795 | ||
796 | /* | |
797 | * Execute the parse tree | |
798 | */ | |
799 | execute(t, tpgrp); | |
800 | ||
801 | /* | |
802 | * Made it! | |
803 | */ | |
804 | freelex(¶ml), freesyn(t); | |
805 | } | |
806 | resexit(osetexit); | |
807 | } | |
808 | ||
809 | dosource(t) | |
810 | register char **t; | |
811 | { | |
812 | register char *f; | |
813 | register int u; | |
d7929fa7 KM |
814 | bool hflg = 0; |
815 | char buf[BUFSIZ]; | |
04d3b78c BJ |
816 | |
817 | t++; | |
d7929fa7 KM |
818 | if (*t && eq(*t, "-h")) { |
819 | t++; | |
820 | hflg++; | |
821 | } | |
822 | strcpy(buf, *t); | |
823 | f = globone(buf); | |
04d3b78c BJ |
824 | u = dmove(open(f, 0), -1); |
825 | xfree(f); | |
d7929fa7 | 826 | if (u < 0 && !hflg) |
04d3b78c | 827 | Perror(f); |
d7929fa7 | 828 | srcunit(u, 0, hflg); |
04d3b78c BJ |
829 | } |
830 | ||
831 | /* | |
832 | * Check for mail. | |
833 | * If we are a login shell, then we don't want to tell | |
834 | * about any mail file unless its been modified | |
835 | * after the time we started. | |
836 | * This prevents us from telling the user things he already | |
837 | * knows, since the login program insists on saying | |
838 | * "You have mail." | |
839 | */ | |
840 | mailchk() | |
841 | { | |
842 | register struct varent *v; | |
843 | register char **vp; | |
844 | time_t t; | |
845 | int intvl, cnt; | |
846 | struct stat stb; | |
847 | bool new; | |
848 | ||
849 | v = adrof("mail"); | |
850 | if (v == 0) | |
851 | return; | |
852 | time(&t); | |
853 | vp = v->vec; | |
854 | cnt = blklen(vp); | |
855 | intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL; | |
856 | if (intvl < 1) | |
857 | intvl = 1; | |
858 | if (chktim + intvl > t) | |
859 | return; | |
860 | for (; *vp; vp++) { | |
861 | if (stat(*vp, &stb) < 0) | |
862 | continue; | |
ae3d9709 | 863 | new = stb.st_mtime > time0.tv_sec; |
04d3b78c BJ |
864 | if (stb.st_size == 0 || stb.st_atime > stb.st_mtime || |
865 | (stb.st_atime < chktim && stb.st_mtime < chktim) || | |
866 | loginsh && !new) | |
867 | continue; | |
868 | if (cnt == 1) | |
869 | printf("You have %smail.\n", new ? "new " : ""); | |
870 | else | |
871 | printf("%s in %s.\n", new ? "New mail" : "Mail", *vp); | |
872 | } | |
873 | chktim = t; | |
874 | } | |
875 | ||
876 | #include <pwd.h> | |
877 | /* | |
878 | * Extract a home directory from the password file | |
879 | * The argument points to a buffer where the name of the | |
880 | * user whose home directory is sought is currently. | |
881 | * We write the home directory of the user back there. | |
882 | */ | |
883 | gethdir(home) | |
884 | char *home; | |
885 | { | |
886 | register struct passwd *pp = getpwnam(home); | |
887 | ||
888 | if (pp == 0) | |
889 | return (1); | |
890 | strcpy(home, pp->pw_dir); | |
891 | return (0); | |
892 | } | |
893 | ||
894 | /* | |
895 | * Move the initial descriptors to their eventual | |
896 | * resting places, closin all other units. | |
897 | */ | |
898 | initdesc() | |
899 | { | |
900 | ||
901 | didcch = 0; /* Havent closed for child */ | |
902 | didfds = 0; /* 0, 1, 2 aren't set up */ | |
903 | SHIN = dcopy(0, FSHIN); | |
904 | SHOUT = dcopy(1, FSHOUT); | |
905 | SHDIAG = dcopy(2, FSHDIAG); | |
906 | OLDSTD = dcopy(SHIN, FOLDSTD); | |
907 | closem(); | |
908 | } | |
909 | ||
e31125a2 SL |
910 | #ifdef PROF |
911 | done(i) | |
912 | #else | |
04d3b78c | 913 | exit(i) |
e31125a2 | 914 | #endif |
04d3b78c BJ |
915 | int i; |
916 | { | |
917 | ||
918 | untty(); | |
919 | #ifdef PROF | |
e31125a2 | 920 | monitor(0); |
04d3b78c BJ |
921 | #else |
922 | _exit(i); | |
923 | #endif | |
924 | } | |
19d39288 | 925 | |
544d4ed6 | 926 | printprompt() |
19d39288 | 927 | { |
544d4ed6 SL |
928 | register char *cp; |
929 | ||
e31125a2 | 930 | if (!whyles) { |
544d4ed6 SL |
931 | for (cp = value("prompt"); *cp; cp++) |
932 | if (*cp == HIST) | |
933 | printf("%d", eventno + 1); | |
934 | else { | |
935 | if (*cp == '\\' && cp[1] == HIST) | |
936 | cp++; | |
937 | putchar(*cp | QUOTE); | |
938 | } | |
939 | } else | |
940 | /* | |
941 | * Prompt for forward reading loop | |
942 | * body content. | |
943 | */ | |
944 | printf("? "); | |
945 | flush(); | |
19d39288 | 946 | } |