Commit | Line | Data |
---|---|---|
6ea8dfee | 1 | static char *sccsid = "@(#)csh.c 4.7 %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; | |
26 | bool prompt = 1; | |
63af20f7 | 27 | bool enterhist = 0; |
04d3b78c BJ |
28 | |
29 | main(c, av) | |
30 | int c; | |
31 | char **av; | |
32 | { | |
33 | register char **v, *cp; | |
34 | register int f; | |
35 | ||
36 | settimes(); /* Immed. estab. timing base */ | |
37 | v = av; | |
38 | if (eq(v[0], "a.out")) /* A.out's are quittable */ | |
39 | quitit = 1; | |
40 | uid = getuid(); | |
41 | loginsh = **v == '-'; | |
42 | if (loginsh) | |
43 | time(&chktim); | |
44 | ||
45 | /* | |
46 | * Move the descriptors to safe places. | |
47 | * The variable didfds is 0 while we have only FSH* to work with. | |
48 | * When didfds is true, we have 0,1,2 and prefer to use these. | |
49 | */ | |
50 | initdesc(); | |
51 | ||
52 | /* | |
53 | * Initialize the shell variables. | |
54 | * ARGV and PROMPT are initialized later. | |
55 | * STATUS is also munged in several places. | |
56 | * CHILD is munged when forking/waiting | |
57 | */ | |
58 | ||
59 | set("status", "0"); | |
60 | dinit(cp = getenv("HOME")); /* dinit thinks that HOME == cwd in a | |
61 | * login shell */ | |
62 | if (cp == NOSTR) | |
63 | fast++; /* No home -> can't read scripts */ | |
64 | else | |
65 | set("home", savestr(cp)); | |
66 | /* | |
67 | * Grab other useful things from the environment. | |
68 | * Should we grab everything?? | |
69 | */ | |
70 | if ((cp = getenv("USER")) != NOSTR) | |
71 | set("user", savestr(cp)); | |
72 | if ((cp = getenv("TERM")) != NOSTR) | |
73 | set("term", savestr(cp)); | |
74 | /* | |
75 | * Re-initialize path if set in environment | |
76 | */ | |
77 | if ((cp = getenv("PATH")) == NOSTR) | |
78 | set1("path", saveblk(pathlist), &shvhed); | |
79 | else { | |
80 | register unsigned i = 0; | |
81 | register char *dp; | |
82 | register char **pv; | |
83 | ||
84 | for (dp = cp; *dp; dp++) | |
85 | if (*dp == ':') | |
86 | i++; | |
87 | pv = (char **)calloc(i+2, sizeof (char **)); | |
88 | for (dp = cp, i = 0; ;) | |
89 | if (*dp == ':') { | |
90 | *dp = 0; | |
91 | pv[i++] = savestr(*cp ? cp : "."); | |
92 | *dp++ = ':'; | |
93 | cp = dp; | |
94 | } else if (*dp++ == 0) { | |
95 | pv[i++] = savestr(*cp ? cp : "."); | |
96 | break; | |
97 | } | |
98 | pv[i] = 0; | |
99 | set1("path", pv, &shvhed); | |
100 | } | |
101 | set("shell", SHELLPATH); | |
102 | ||
103 | doldol = putn(getpid()); /* For $$ */ | |
104 | shtemp = strspl("/tmp/sh", doldol); /* For << */ | |
105 | ||
106 | /* | |
107 | * Record the interrupt states from the parent process. | |
108 | * If the parent is non-interruptible our hand must be forced | |
109 | * or we (and our children) won't be either. | |
110 | * Our children inherit termination from our parent. | |
111 | * We catch it only if we are the login shell. | |
112 | */ | |
113 | parintr = signal(SIGINT, SIG_IGN); /* parents interruptibility */ | |
114 | sigset(SIGINT, parintr); /* ... restore */ | |
115 | parterm = signal(SIGTERM, SIG_IGN); /* parents terminability */ | |
116 | signal(SIGTERM, parterm); /* ... restore */ | |
f66d6be5 | 117 | if (loginsh) { |
d7929fa7 | 118 | signal(SIGHUP, phup); /* exit processing on HUP */ |
f66d6be5 KM |
119 | signal(SIGXCPU, phup); /* ...and on XCPU */ |
120 | signal(SIGXFSZ, phup); /* ...and on XFSZ */ | |
121 | } | |
04d3b78c BJ |
122 | |
123 | /* | |
124 | * Process the arguments. | |
125 | * | |
126 | * Note that processing of -v/-x is actually delayed till after | |
127 | * script processing. | |
128 | * | |
129 | * We set the first character of our name to be '-' if we are | |
130 | * a shell running interruptible commands. Many programs which | |
131 | * examine ps'es use this to filter such shells out. | |
132 | */ | |
133 | c--, v++; | |
134 | while (c > 0 && (cp = v[0])[0] == '-') { | |
135 | do switch (*cp++) { | |
136 | ||
137 | case 0: /* - Interruptible, no prompt */ | |
138 | prompt = 0; | |
139 | setintr++; | |
140 | nofile++; | |
141 | break; | |
142 | ||
143 | case 'c': /* -c Command input from arg */ | |
144 | if (c == 1) | |
145 | exit(0); | |
146 | c--, v++; | |
147 | arginp = v[0]; | |
148 | prompt = 0; | |
149 | nofile++; | |
150 | break; | |
151 | ||
152 | case 'e': /* -e Exit on any error */ | |
153 | exiterr++; | |
154 | break; | |
155 | ||
156 | case 'f': /* -f Fast start */ | |
157 | fast++; | |
158 | break; | |
159 | ||
160 | case 'i': /* -i Interactive, even if !intty */ | |
161 | intact++; | |
162 | nofile++; | |
163 | break; | |
164 | ||
165 | case 'n': /* -n Don't execute */ | |
166 | noexec++; | |
167 | break; | |
168 | ||
169 | case 'q': /* -q (Undoc'd) ... die on quit */ | |
170 | quitit = 1; | |
171 | break; | |
172 | ||
173 | case 's': /* -s Read from std input */ | |
174 | nofile++; | |
175 | break; | |
176 | ||
177 | case 't': /* -t Read one line from input */ | |
178 | onelflg = 2; | |
179 | prompt = 0; | |
180 | nofile++; | |
181 | break; | |
182 | ||
183 | case 'v': /* -v Echo hist expanded input */ | |
184 | nverbose = 1; /* ... later */ | |
185 | break; | |
186 | ||
187 | case 'x': /* -x Echo just before execution */ | |
188 | nexececho = 1; /* ... later */ | |
189 | break; | |
190 | ||
191 | case 'V': /* -V Echo hist expanded input */ | |
192 | setNS("verbose"); /* NOW! */ | |
193 | break; | |
194 | ||
195 | case 'X': /* -X Echo just before execution */ | |
196 | setNS("echo"); /* NOW! */ | |
197 | break; | |
198 | ||
199 | } while (*cp); | |
200 | v++, c--; | |
201 | } | |
202 | ||
203 | if (quitit) /* With all due haste, for debugging */ | |
204 | signal(SIGQUIT, SIG_DFL); | |
205 | ||
206 | /* | |
207 | * Unless prevented by -, -c, -i, -s, or -t, if there | |
208 | * are remaining arguments the first of them is the name | |
209 | * of a shell file from which to read commands. | |
210 | */ | |
211 | if (nofile == 0 && c > 0) { | |
212 | nofile = open(v[0], 0); | |
213 | if (nofile < 0) { | |
214 | child++; /* So this ... */ | |
215 | Perror(v[0]); /* ... doesn't return */ | |
216 | } | |
217 | file = v[0]; | |
218 | SHIN = dmove(nofile, FSHIN); /* Replace FSHIN */ | |
219 | prompt = 0; | |
220 | c--, v++; | |
221 | } | |
222 | /* | |
223 | * Consider input a tty if it really is or we are interactive. | |
224 | */ | |
225 | intty = intact || isatty(SHIN); | |
226 | /* | |
227 | * Decide whether we should play with signals or not. | |
228 | * If we are explicitly told (via -i, or -) or we are a login | |
229 | * shell (arg0 starts with -) or the input and output are both | |
230 | * the ttys("csh", or "csh</dev/ttyx>/dev/ttyx") | |
231 | * Note that in only the login shell is it likely that parent | |
232 | * may have set signals to be ignored | |
233 | */ | |
234 | if (loginsh || intact || intty && isatty(SHOUT)) | |
235 | setintr = 1; | |
236 | #ifdef TELL | |
237 | settell(); | |
238 | #endif | |
239 | /* | |
240 | * Save the remaining arguments in argv. | |
241 | */ | |
242 | setq("argv", v, &shvhed); | |
243 | ||
244 | /* | |
245 | * Set up the prompt. | |
246 | */ | |
247 | if (prompt) | |
248 | set("prompt", uid == 0 ? "# " : "% "); | |
249 | ||
250 | /* | |
251 | * If we are an interactive shell, then start fiddling | |
252 | * with the signals; this is a tricky game. | |
253 | */ | |
254 | shpgrp = getpgrp(0); | |
255 | opgrp = tpgrp = -1; | |
256 | oldisc = -1; | |
257 | if (setintr) { | |
258 | **av = '-'; | |
259 | if (!quitit) /* Wary! */ | |
260 | signal(SIGQUIT, SIG_IGN); | |
261 | sigset(SIGINT, pintr); | |
262 | sighold(SIGINT); | |
263 | signal(SIGTERM, SIG_IGN); | |
264 | if (quitit == 0 && arginp == 0) { | |
265 | signal(SIGTSTP, SIG_IGN); | |
266 | signal(SIGTTIN, SIG_IGN); | |
267 | signal(SIGTTOU, SIG_IGN); | |
268 | /* | |
269 | * Wait till in foreground, in case someone | |
270 | * stupidly runs | |
271 | * csh & | |
272 | * dont want to try to grab away the tty. | |
273 | */ | |
274 | if (isatty(FSHDIAG)) | |
275 | f = FSHDIAG; | |
276 | else if (isatty(FSHOUT)) | |
277 | f = FSHOUT; | |
278 | else if (isatty(OLDSTD)) | |
279 | f = OLDSTD; | |
280 | else | |
281 | f = -1; | |
282 | retry: | |
283 | if (ioctl(f, TIOCGPGRP, &tpgrp) == 0 && tpgrp != -1) { | |
284 | int ldisc; | |
285 | if (tpgrp != shpgrp) { | |
286 | int old = sigsys(SIGTTIN, SIG_DFL); | |
287 | kill(0, SIGTTIN); | |
288 | sigsys(SIGTTIN, old); | |
289 | goto retry; | |
290 | } | |
291 | if (ioctl(f, TIOCGETD, &oldisc) != 0) | |
292 | goto notty; | |
293 | if (oldisc != NTTYDISC) { | |
d7929fa7 KM |
294 | #ifdef DEBUG |
295 | printf("Switching to new tty driver...\n"); | |
296 | #endif DEBUG | |
04d3b78c BJ |
297 | ldisc = NTTYDISC; |
298 | ioctl(f, TIOCSETD, &ldisc); | |
299 | } else | |
300 | oldisc = -1; | |
301 | opgrp = shpgrp; | |
302 | shpgrp = getpid(); | |
303 | tpgrp = shpgrp; | |
304 | ioctl(f, TIOCSPGRP, &shpgrp); | |
305 | setpgrp(0, shpgrp); | |
306 | dcopy(f, FSHTTY); | |
307 | ioctl(FSHTTY, FIOCLEX, 0); | |
308 | } else { | |
309 | notty: | |
310 | printf("Warning: no access to tty; thus no job control in this shell...\n"); | |
311 | tpgrp = -1; | |
312 | } | |
313 | } | |
314 | } | |
315 | sigset(SIGCHLD, pchild); /* while signals not ready */ | |
316 | ||
317 | /* | |
318 | * Set an exit here in case of an interrupt or error reading | |
319 | * the shell start-up scripts. | |
320 | */ | |
321 | setexit(); | |
322 | haderr = 0; /* In case second time through */ | |
323 | if (!fast && reenter == 0) { | |
324 | reenter++; | |
325 | /* Will have value("home") here because set fast if don't */ | |
326 | srccat(value("home"), "/.cshrc"); | |
327 | if (!fast && !arginp && !onelflg) | |
328 | dohash(); | |
d7929fa7 | 329 | dosource(loadhist); |
04d3b78c | 330 | if (loginsh) { |
04d3b78c BJ |
331 | srccat(value("home"), "/.login"); |
332 | } | |
333 | } | |
334 | ||
335 | /* | |
336 | * Now are ready for the -v and -x flags | |
337 | */ | |
338 | if (nverbose) | |
339 | setNS("verbose"); | |
340 | if (nexececho) | |
341 | setNS("echo"); | |
342 | ||
343 | /* | |
344 | * All the rest of the world is inside this call. | |
345 | * The argument to process indicates whether it should | |
346 | * catch "error unwinds". Thus if we are a interactive shell | |
347 | * our call here will never return by being blown past on an error. | |
348 | */ | |
349 | process(setintr); | |
350 | ||
351 | /* | |
352 | * Mop-up. | |
353 | */ | |
354 | if (loginsh) { | |
355 | printf("logout\n"); | |
356 | close(SHIN); | |
357 | child++; | |
358 | goodbye(); | |
359 | } | |
d7929fa7 | 360 | rechist(); |
04d3b78c BJ |
361 | exitstat(); |
362 | } | |
363 | ||
364 | untty() | |
365 | { | |
366 | ||
367 | if (tpgrp > 0) { | |
368 | setpgrp(0, opgrp); | |
369 | ioctl(FSHTTY, TIOCSPGRP, &opgrp); | |
370 | if (oldisc != -1 && oldisc != NTTYDISC) { | |
d7929fa7 | 371 | #ifdef DEBUG |
04d3b78c | 372 | printf("\nReverting to old tty driver...\n"); |
d7929fa7 | 373 | #endif DEBUG |
04d3b78c BJ |
374 | ioctl(FSHTTY, TIOCSETD, &oldisc); |
375 | } | |
376 | } | |
377 | } | |
378 | ||
379 | importpath(cp) | |
380 | char *cp; | |
381 | { | |
382 | register int i = 0; | |
383 | register char *dp; | |
384 | register char **pv; | |
385 | int c; | |
386 | static char dot[2] = {'.', 0}; | |
387 | ||
388 | for (dp = cp; *dp; dp++) | |
389 | if (*dp == ':') | |
390 | i++; | |
391 | /* | |
392 | * i+2 where i is the number of colons in the path. | |
393 | * There are i+1 directories in the path plus we need | |
394 | * room for a zero terminator. | |
395 | */ | |
396 | pv = (char **) calloc(i+2, sizeof (char **)); | |
397 | dp = cp; | |
398 | i = 0; | |
399 | if (*dp) | |
400 | for (;;) { | |
401 | if ((c = *dp) == ':' || c == 0) { | |
402 | *dp = 0; | |
403 | pv[i++] = savestr(*cp ? cp : dot); | |
404 | if (c) { | |
405 | cp = dp + 1; | |
406 | *dp = ':'; | |
407 | } else | |
408 | break; | |
409 | } | |
410 | dp++; | |
411 | } | |
412 | pv[i] = 0; | |
413 | set1("path", pv, &shvhed); | |
414 | } | |
415 | ||
416 | /* | |
417 | * Source to the file which is the catenation of the argument names. | |
418 | */ | |
419 | srccat(cp, dp) | |
420 | char *cp, *dp; | |
421 | { | |
422 | register char *ep = strspl(cp, dp); | |
423 | register int unit = dmove(open(ep, 0), -1); | |
424 | ||
425 | /* ioctl(unit, FIOCLEX, NULL); */ | |
426 | xfree(ep); | |
427 | #ifdef INGRES | |
d7929fa7 | 428 | srcunit(unit, 0, 0); |
04d3b78c | 429 | #else |
d7929fa7 | 430 | srcunit(unit, 1, 0); |
04d3b78c BJ |
431 | #endif |
432 | } | |
433 | ||
434 | /* | |
435 | * Source to a unit. If onlyown it must be our file or our group or | |
436 | * we don't chance it. This occurs on ".cshrc"s and the like. | |
437 | */ | |
d7929fa7 | 438 | srcunit(unit, onlyown, hflg) |
04d3b78c BJ |
439 | register int unit; |
440 | bool onlyown; | |
d7929fa7 | 441 | bool hflg; |
04d3b78c BJ |
442 | { |
443 | /* We have to push down a lot of state here */ | |
444 | /* All this could go into a structure */ | |
445 | int oSHIN = -1, oldintty = intty; | |
446 | struct whyle *oldwhyl = whyles; | |
447 | char *ogointr = gointr, *oarginp = arginp; | |
448 | char *oevalp = evalp, **oevalvec = evalvec; | |
449 | int oonelflg = onelflg; | |
d7929fa7 KM |
450 | bool oenterhist = enterhist; |
451 | char OHIST = HIST; | |
04d3b78c BJ |
452 | #ifdef TELL |
453 | bool otell = cantell; | |
454 | #endif | |
455 | struct Bin saveB; | |
456 | ||
457 | /* The (few) real local variables */ | |
458 | jmp_buf oldexit; | |
459 | int reenter; | |
460 | ||
461 | if (unit < 0) | |
462 | return; | |
463 | if (didfds) | |
464 | donefds(); | |
465 | if (onlyown) { | |
466 | struct stat stb; | |
467 | ||
468 | if (fstat(unit, &stb) < 0 || (stb.st_uid != uid && stb.st_gid != getgid())) { | |
469 | close(unit); | |
470 | return; | |
471 | } | |
472 | } | |
473 | ||
474 | /* | |
475 | * There is a critical section here while we are pushing down the | |
476 | * input stream since we have stuff in different structures. | |
477 | * If we weren't careful an interrupt could corrupt SHIN's Bin | |
478 | * structure and kill the shell. | |
479 | * | |
480 | * We could avoid the critical region by grouping all the stuff | |
481 | * in a single structure and pointing at it to move it all at | |
482 | * once. This is less efficient globally on many variable references | |
483 | * however. | |
484 | */ | |
485 | getexit(oldexit); | |
486 | reenter = 0; | |
487 | if (setintr) | |
488 | sighold(SIGINT); | |
489 | setexit(); | |
490 | reenter++; | |
491 | if (reenter == 1) { | |
492 | /* Setup the new values of the state stuff saved above */ | |
493 | copy((char *)&saveB, (char *)&B, sizeof saveB); | |
494 | fbuf = (char **) 0; | |
495 | fseekp = feobp = fblocks = 0; | |
496 | oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0; | |
497 | intty = isatty(SHIN), whyles = 0, gointr = 0; | |
498 | evalvec = 0; evalp = 0; | |
d7929fa7 KM |
499 | enterhist = hflg; |
500 | if (enterhist) | |
501 | HIST = '\0'; | |
04d3b78c BJ |
502 | /* |
503 | * Now if we are allowing commands to be interrupted, | |
504 | * we let ourselves be interrupted. | |
505 | */ | |
506 | if (setintr) | |
507 | sigrelse(SIGINT); | |
508 | #ifdef TELL | |
509 | settell(); | |
510 | #endif | |
511 | process(0); /* 0 -> blow away on errors */ | |
512 | } | |
513 | if (setintr) | |
514 | sigrelse(SIGINT); | |
515 | if (oSHIN >= 0) { | |
516 | register int i; | |
517 | ||
518 | /* We made it to the new state... free up its storage */ | |
519 | /* This code could get run twice but xfree doesn't care */ | |
520 | for (i = 0; i < fblocks; i++) | |
521 | xfree(fbuf[i]); | |
522 | xfree((char *)fbuf); | |
523 | ||
524 | /* Reset input arena */ | |
525 | copy((char *)&B, (char *)&saveB, sizeof B); | |
526 | ||
527 | close(SHIN), SHIN = oSHIN; | |
528 | arginp = oarginp, onelflg = oonelflg; | |
529 | evalp = oevalp, evalvec = oevalvec; | |
530 | intty = oldintty, whyles = oldwhyl, gointr = ogointr; | |
020d9a25 KM |
531 | if (enterhist) |
532 | HIST = OHIST; | |
d7929fa7 | 533 | enterhist = oenterhist; |
04d3b78c BJ |
534 | #ifdef TELL |
535 | cantell = otell; | |
536 | #endif | |
537 | } | |
538 | ||
539 | resexit(oldexit); | |
540 | /* | |
541 | * If process reset() (effectively an unwind) then | |
542 | * we must also unwind. | |
543 | */ | |
544 | if (reenter >= 2) | |
545 | error(NOSTR); | |
546 | } | |
547 | ||
d7929fa7 | 548 | rechist() |
04d3b78c | 549 | { |
63af20f7 KM |
550 | char buf[BUFSIZ]; |
551 | int fp, ftmp, oldidfds; | |
04d3b78c | 552 | |
d7929fa7 | 553 | if (!fast) { |
6ea8dfee KM |
554 | if (value("savehist")[0] == '\0') |
555 | return; | |
63af20f7 KM |
556 | strcpy(buf, value("home")); |
557 | strcat(buf, "/.history"); | |
558 | fp = creat(buf, 0777); | |
6ea8dfee KM |
559 | if (fp == -1) |
560 | return; | |
561 | oldidfds = didfds; | |
562 | didfds = 0; | |
563 | ftmp = SHOUT; | |
564 | SHOUT = fp; | |
565 | strcpy(buf, value("savehist")); | |
566 | dumphist[2] = buf; | |
567 | dohist(dumphist); | |
568 | close(fp); | |
569 | SHOUT = ftmp; | |
570 | didfds = oldidfds; | |
d7929fa7 KM |
571 | } |
572 | } | |
573 | ||
574 | goodbye() | |
575 | { | |
576 | if (loginsh) { | |
04d3b78c BJ |
577 | signal(SIGQUIT, SIG_IGN); |
578 | sigset(SIGINT, SIG_IGN); | |
579 | signal(SIGTERM, SIG_IGN); | |
580 | setintr = 0; /* No interrupts after "logout" */ | |
581 | if (adrof("home")) | |
582 | srccat(value("home"), "/.logout"); | |
583 | } | |
d7929fa7 | 584 | rechist(); |
04d3b78c BJ |
585 | exitstat(); |
586 | } | |
587 | ||
588 | exitstat() | |
589 | { | |
590 | ||
591 | /* | |
592 | * Note that if STATUS is corrupted (i.e. getn bombs) | |
593 | * then error will exit directly because we poke child here. | |
594 | * Otherwise we might continue unwarrantedly (sic). | |
595 | */ | |
596 | child++; | |
597 | exit(getn(value("status"))); | |
598 | } | |
599 | ||
d7929fa7 KM |
600 | /* |
601 | * in the event of a HUP we want to save the history | |
602 | */ | |
603 | phup() | |
604 | { | |
605 | rechist(); | |
606 | exit(1); | |
607 | } | |
608 | ||
04d3b78c BJ |
609 | char *jobargv[2] = { "jobs", 0 }; |
610 | /* | |
611 | * Catch an interrupt, e.g. during lexical input. | |
612 | * If we are an interactive shell, we reset the interrupt catch | |
613 | * immediately. In any case we drain the shell output, | |
614 | * and finally go through the normal error mechanism, which | |
615 | * gets a chance to make the shell go away. | |
616 | */ | |
617 | pintr() | |
401149be BJ |
618 | { |
619 | pintr1(1); | |
620 | } | |
621 | ||
622 | pintr1(wantnl) | |
623 | bool wantnl; | |
04d3b78c BJ |
624 | { |
625 | register char **v; | |
626 | ||
627 | if (setintr) { | |
628 | sigrelse(SIGINT); | |
629 | if (pjobs) { | |
630 | pjobs = 0; | |
631 | printf("\n"); | |
632 | dojobs(jobargv); | |
633 | bferr("Interrupted"); | |
634 | } | |
635 | } | |
636 | if (setintr) | |
637 | sighold(SIGINT); | |
638 | sigrelse(SIGCHLD); | |
639 | draino(); | |
640 | ||
641 | /* | |
642 | * If we have an active "onintr" then we search for the label. | |
643 | * Note that if one does "onintr -" then we shan't be interruptible | |
644 | * so we needn't worry about that here. | |
645 | */ | |
646 | if (gointr) { | |
647 | search(ZGOTO, 0, gointr); | |
648 | timflg = 0; | |
649 | if (v = pargv) | |
650 | pargv = 0, blkfree(v); | |
651 | if (v = gargv) | |
652 | gargv = 0, blkfree(v); | |
653 | reset(); | |
401149be | 654 | } else if (intty && wantnl) |
04d3b78c BJ |
655 | printf("\n"); /* Some like this, others don't */ |
656 | error(NOSTR); | |
657 | } | |
658 | ||
659 | /* | |
660 | * Process is the main driving routine for the shell. | |
661 | * It runs all command processing, except for those within { ... } | |
662 | * in expressions (which is run by a routine evalav in sh.exp.c which | |
663 | * is a stripped down process), and `...` evaluation which is run | |
664 | * also by a subset of this code in sh.glob.c in the routine backeval. | |
665 | * | |
666 | * The code here is a little strange because part of it is interruptible | |
667 | * and hence freeing of structures appears to occur when none is necessary | |
668 | * if this is ignored. | |
669 | * | |
670 | * Note that if catch is not set then we will unwind on any error. | |
671 | * If an end-of-file occurs, we return. | |
672 | */ | |
673 | process(catch) | |
674 | bool catch; | |
675 | { | |
676 | register char *cp; | |
677 | jmp_buf osetexit; | |
678 | struct command *t; | |
679 | ||
680 | getexit(osetexit); | |
681 | for (;;) { | |
682 | pendjob(); | |
683 | paraml.next = paraml.prev = ¶ml; | |
684 | paraml.word = ""; | |
685 | t = 0; | |
686 | setexit(); | |
63af20f7 | 687 | justpr = enterhist; /* execute if not entering history */ |
04d3b78c BJ |
688 | |
689 | /* | |
690 | * Interruptible during interactive reads | |
691 | */ | |
692 | if (setintr) | |
693 | sigrelse(SIGINT); | |
694 | ||
695 | /* | |
696 | * For the sake of reset() | |
697 | */ | |
698 | freelex(¶ml), freesyn(t), t = 0; | |
699 | ||
700 | if (haderr) { | |
701 | if (!catch) { | |
702 | /* unwind */ | |
703 | doneinp = 0; | |
704 | resexit(osetexit); | |
705 | reset(); | |
706 | } | |
707 | haderr = 0; | |
708 | /* | |
709 | * Every error is eventually caught here or | |
710 | * the shell dies. It is at this | |
711 | * point that we clean up any left-over open | |
712 | * files, by closing all but a fixed number | |
713 | * of pre-defined files. Thus routines don't | |
714 | * have to worry about leaving files open due | |
715 | * to deeper errors... they will get closed here. | |
716 | */ | |
717 | closem(); | |
718 | continue; | |
719 | } | |
720 | if (doneinp) { | |
721 | doneinp = 0; | |
722 | break; | |
723 | } | |
724 | if (chkstop) | |
725 | chkstop--; | |
726 | if (neednote) | |
727 | pnote(); | |
728 | if (intty && evalvec == 0) { | |
729 | mailchk(); | |
730 | /* | |
731 | * If we are at the end of the input buffer | |
732 | * then we are going to read fresh stuff. | |
733 | * Otherwise, we are rereading input and don't | |
734 | * need or want to prompt. | |
735 | */ | |
736 | if (fseekp == feobp) | |
737 | if (!whyles) | |
738 | for (cp = value("prompt"); *cp; cp++) | |
739 | if (*cp == HIST) | |
740 | printf("%d", eventno + 1); | |
741 | else { | |
742 | if (*cp == '\\' && cp[1] == HIST) | |
743 | cp++; | |
744 | putchar(*cp | QUOTE); | |
745 | } | |
746 | else | |
747 | /* | |
748 | * Prompt for forward reading loop | |
749 | * body content. | |
750 | */ | |
751 | printf("? "); | |
752 | flush(); | |
753 | } | |
754 | err = 0; | |
755 | ||
756 | /* | |
757 | * Echo not only on VERBOSE, but also with history expansion. | |
758 | * If there is a lexical error then we forego history echo. | |
759 | */ | |
d7929fa7 KM |
760 | if (lex(¶ml) && !err && intty || |
761 | adrof("verbose")) { | |
04d3b78c BJ |
762 | haderr = 1; |
763 | prlex(¶ml); | |
764 | haderr = 0; | |
765 | } | |
766 | ||
767 | /* | |
768 | * The parser may lose space if interrupted. | |
769 | */ | |
770 | if (setintr) | |
771 | sighold(SIGINT); | |
772 | ||
773 | /* | |
63af20f7 KM |
774 | * Save input text on the history list if |
775 | * reading in old history, or it | |
04d3b78c BJ |
776 | * is from the terminal at the top level and not |
777 | * in a loop. | |
778 | */ | |
63af20f7 | 779 | if (enterhist || catch && intty && !whyles) |
04d3b78c BJ |
780 | savehist(¶ml); |
781 | ||
782 | /* | |
d7929fa7 KM |
783 | * Print lexical error messages, except when sourcing |
784 | * history lists. | |
04d3b78c | 785 | */ |
d7929fa7 | 786 | if (!enterhist && err) |
04d3b78c BJ |
787 | error(err); |
788 | ||
789 | /* | |
790 | * If had a history command :p modifier then | |
791 | * this is as far as we should go | |
792 | */ | |
793 | if (justpr) | |
794 | reset(); | |
795 | ||
796 | alias(¶ml); | |
797 | ||
798 | /* | |
799 | * Parse the words of the input into a parse tree. | |
800 | */ | |
801 | t = syntax(paraml.next, ¶ml, 0); | |
802 | if (err) | |
803 | error(err); | |
804 | ||
805 | /* | |
806 | * Execute the parse tree | |
807 | */ | |
808 | execute(t, tpgrp); | |
809 | ||
810 | /* | |
811 | * Made it! | |
812 | */ | |
813 | freelex(¶ml), freesyn(t); | |
814 | } | |
815 | resexit(osetexit); | |
816 | } | |
817 | ||
818 | dosource(t) | |
819 | register char **t; | |
820 | { | |
821 | register char *f; | |
822 | register int u; | |
d7929fa7 KM |
823 | bool hflg = 0; |
824 | char buf[BUFSIZ]; | |
04d3b78c BJ |
825 | |
826 | t++; | |
d7929fa7 KM |
827 | if (*t && eq(*t, "-h")) { |
828 | t++; | |
829 | hflg++; | |
830 | } | |
831 | strcpy(buf, *t); | |
832 | f = globone(buf); | |
04d3b78c BJ |
833 | u = dmove(open(f, 0), -1); |
834 | xfree(f); | |
d7929fa7 | 835 | if (u < 0 && !hflg) |
04d3b78c | 836 | Perror(f); |
d7929fa7 | 837 | srcunit(u, 0, hflg); |
04d3b78c BJ |
838 | } |
839 | ||
840 | /* | |
841 | * Check for mail. | |
842 | * If we are a login shell, then we don't want to tell | |
843 | * about any mail file unless its been modified | |
844 | * after the time we started. | |
845 | * This prevents us from telling the user things he already | |
846 | * knows, since the login program insists on saying | |
847 | * "You have mail." | |
848 | */ | |
849 | mailchk() | |
850 | { | |
851 | register struct varent *v; | |
852 | register char **vp; | |
853 | time_t t; | |
854 | int intvl, cnt; | |
855 | struct stat stb; | |
856 | bool new; | |
857 | ||
858 | v = adrof("mail"); | |
859 | if (v == 0) | |
860 | return; | |
861 | time(&t); | |
862 | vp = v->vec; | |
863 | cnt = blklen(vp); | |
864 | intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL; | |
865 | if (intvl < 1) | |
866 | intvl = 1; | |
867 | if (chktim + intvl > t) | |
868 | return; | |
869 | for (; *vp; vp++) { | |
870 | if (stat(*vp, &stb) < 0) | |
871 | continue; | |
872 | new = stb.st_mtime > time0; | |
873 | if (stb.st_size == 0 || stb.st_atime > stb.st_mtime || | |
874 | (stb.st_atime < chktim && stb.st_mtime < chktim) || | |
875 | loginsh && !new) | |
876 | continue; | |
877 | if (cnt == 1) | |
878 | printf("You have %smail.\n", new ? "new " : ""); | |
879 | else | |
880 | printf("%s in %s.\n", new ? "New mail" : "Mail", *vp); | |
881 | } | |
882 | chktim = t; | |
883 | } | |
884 | ||
885 | #include <pwd.h> | |
886 | /* | |
887 | * Extract a home directory from the password file | |
888 | * The argument points to a buffer where the name of the | |
889 | * user whose home directory is sought is currently. | |
890 | * We write the home directory of the user back there. | |
891 | */ | |
892 | gethdir(home) | |
893 | char *home; | |
894 | { | |
895 | register struct passwd *pp = getpwnam(home); | |
896 | ||
897 | if (pp == 0) | |
898 | return (1); | |
899 | strcpy(home, pp->pw_dir); | |
900 | return (0); | |
901 | } | |
902 | ||
903 | /* | |
904 | * Move the initial descriptors to their eventual | |
905 | * resting places, closin all other units. | |
906 | */ | |
907 | initdesc() | |
908 | { | |
909 | ||
910 | didcch = 0; /* Havent closed for child */ | |
911 | didfds = 0; /* 0, 1, 2 aren't set up */ | |
912 | SHIN = dcopy(0, FSHIN); | |
913 | SHOUT = dcopy(1, FSHOUT); | |
914 | SHDIAG = dcopy(2, FSHDIAG); | |
915 | OLDSTD = dcopy(SHIN, FOLDSTD); | |
916 | closem(); | |
917 | } | |
918 | ||
919 | exit(i) | |
920 | int i; | |
921 | { | |
922 | ||
923 | untty(); | |
924 | #ifdef PROF | |
925 | IEH3exit(i); | |
926 | #else | |
927 | _exit(i); | |
928 | #endif | |
929 | } |