Commit | Line | Data |
---|---|---|
d33af40e | 1 | static char *sccsid = "@(#)csh.c 4.18 %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; | |
d33af40e | 35 | struct sigvec osv; |
04d3b78c BJ |
36 | |
37 | settimes(); /* Immed. estab. timing base */ | |
38 | v = av; | |
39 | if (eq(v[0], "a.out")) /* A.out's are quittable */ | |
40 | quitit = 1; | |
41 | uid = getuid(); | |
d33af40e | 42 | loginsh = **v == '-' && c == 1; |
04d3b78c BJ |
43 | if (loginsh) |
44 | time(&chktim); | |
45 | ||
46 | /* | |
47 | * Move the descriptors to safe places. | |
48 | * The variable didfds is 0 while we have only FSH* to work with. | |
49 | * When didfds is true, we have 0,1,2 and prefer to use these. | |
50 | */ | |
51 | initdesc(); | |
52 | ||
53 | /* | |
54 | * Initialize the shell variables. | |
55 | * ARGV and PROMPT are initialized later. | |
56 | * STATUS is also munged in several places. | |
57 | * CHILD is munged when forking/waiting | |
58 | */ | |
59 | ||
60 | set("status", "0"); | |
61 | dinit(cp = getenv("HOME")); /* dinit thinks that HOME == cwd in a | |
62 | * login shell */ | |
63 | if (cp == NOSTR) | |
64 | fast++; /* No home -> can't read scripts */ | |
65 | else | |
66 | set("home", savestr(cp)); | |
67 | /* | |
68 | * Grab other useful things from the environment. | |
69 | * Should we grab everything?? | |
70 | */ | |
71 | if ((cp = getenv("USER")) != NOSTR) | |
72 | set("user", savestr(cp)); | |
73 | if ((cp = getenv("TERM")) != NOSTR) | |
74 | set("term", savestr(cp)); | |
75 | /* | |
76 | * Re-initialize path if set in environment | |
77 | */ | |
78 | if ((cp = getenv("PATH")) == NOSTR) | |
79 | set1("path", saveblk(pathlist), &shvhed); | |
80 | else { | |
81 | register unsigned i = 0; | |
82 | register char *dp; | |
83 | register char **pv; | |
84 | ||
85 | for (dp = cp; *dp; dp++) | |
86 | if (*dp == ':') | |
87 | i++; | |
88 | pv = (char **)calloc(i+2, sizeof (char **)); | |
89 | for (dp = cp, i = 0; ;) | |
90 | if (*dp == ':') { | |
91 | *dp = 0; | |
92 | pv[i++] = savestr(*cp ? cp : "."); | |
93 | *dp++ = ':'; | |
94 | cp = dp; | |
95 | } else if (*dp++ == 0) { | |
96 | pv[i++] = savestr(*cp ? cp : "."); | |
97 | break; | |
98 | } | |
99 | pv[i] = 0; | |
100 | set1("path", pv, &shvhed); | |
101 | } | |
102 | set("shell", SHELLPATH); | |
103 | ||
104 | doldol = putn(getpid()); /* For $$ */ | |
105 | shtemp = strspl("/tmp/sh", doldol); /* For << */ | |
106 | ||
107 | /* | |
108 | * Record the interrupt states from the parent process. | |
109 | * If the parent is non-interruptible our hand must be forced | |
110 | * or we (and our children) won't be either. | |
111 | * Our children inherit termination from our parent. | |
112 | * We catch it only if we are the login shell. | |
113 | */ | |
d33af40e RC |
114 | sigvec(SIGINT, 0, &osv); /* parents interruptibility */ |
115 | parintr = osv.sv_handler; | |
116 | sigvec(SIGTERM, 0, &osv); /* parents terminability */ | |
117 | parterm = osv.sv_handler; | |
f66d6be5 | 118 | if (loginsh) { |
d7929fa7 | 119 | signal(SIGHUP, phup); /* exit processing on HUP */ |
f66d6be5 KM |
120 | signal(SIGXCPU, phup); /* ...and on XCPU */ |
121 | signal(SIGXFSZ, phup); /* ...and on XFSZ */ | |
122 | } | |
04d3b78c BJ |
123 | |
124 | /* | |
125 | * Process the arguments. | |
126 | * | |
127 | * Note that processing of -v/-x is actually delayed till after | |
128 | * script processing. | |
129 | * | |
130 | * We set the first character of our name to be '-' if we are | |
131 | * a shell running interruptible commands. Many programs which | |
132 | * examine ps'es use this to filter such shells out. | |
133 | */ | |
134 | c--, v++; | |
135 | while (c > 0 && (cp = v[0])[0] == '-') { | |
d33af40e | 136 | cp++; |
04d3b78c BJ |
137 | do switch (*cp++) { |
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 | } | |
198 | ||
199 | if (quitit) /* With all due haste, for debugging */ | |
200 | signal(SIGQUIT, SIG_DFL); | |
201 | ||
202 | /* | |
203 | * Unless prevented by -, -c, -i, -s, or -t, if there | |
204 | * are remaining arguments the first of them is the name | |
205 | * of a shell file from which to read commands. | |
206 | */ | |
207 | if (nofile == 0 && c > 0) { | |
208 | nofile = open(v[0], 0); | |
209 | if (nofile < 0) { | |
210 | child++; /* So this ... */ | |
211 | Perror(v[0]); /* ... doesn't return */ | |
212 | } | |
213 | file = v[0]; | |
214 | SHIN = dmove(nofile, FSHIN); /* Replace FSHIN */ | |
215 | prompt = 0; | |
216 | c--, v++; | |
217 | } | |
218 | /* | |
219 | * Consider input a tty if it really is or we are interactive. | |
220 | */ | |
221 | intty = intact || isatty(SHIN); | |
222 | /* | |
223 | * Decide whether we should play with signals or not. | |
224 | * If we are explicitly told (via -i, or -) or we are a login | |
225 | * shell (arg0 starts with -) or the input and output are both | |
226 | * the ttys("csh", or "csh</dev/ttyx>/dev/ttyx") | |
227 | * Note that in only the login shell is it likely that parent | |
228 | * may have set signals to be ignored | |
229 | */ | |
3b1a0a1e | 230 | if (loginsh || intact || intty && isatty(SHOUT)) |
04d3b78c BJ |
231 | setintr = 1; |
232 | #ifdef TELL | |
233 | settell(); | |
234 | #endif | |
235 | /* | |
236 | * Save the remaining arguments in argv. | |
237 | */ | |
238 | setq("argv", v, &shvhed); | |
239 | ||
240 | /* | |
241 | * Set up the prompt. | |
242 | */ | |
243 | if (prompt) | |
244 | set("prompt", uid == 0 ? "# " : "% "); | |
245 | ||
246 | /* | |
247 | * If we are an interactive shell, then start fiddling | |
248 | * with the signals; this is a tricky game. | |
249 | */ | |
250 | shpgrp = getpgrp(0); | |
251 | opgrp = tpgrp = -1; | |
252 | oldisc = -1; | |
253 | if (setintr) { | |
254 | **av = '-'; | |
255 | if (!quitit) /* Wary! */ | |
256 | signal(SIGQUIT, SIG_IGN); | |
d33af40e RC |
257 | signal(SIGINT, pintr); |
258 | sigblock(sigmask(SIGINT)); | |
04d3b78c BJ |
259 | signal(SIGTERM, SIG_IGN); |
260 | if (quitit == 0 && arginp == 0) { | |
261 | signal(SIGTSTP, SIG_IGN); | |
262 | signal(SIGTTIN, SIG_IGN); | |
263 | signal(SIGTTOU, SIG_IGN); | |
264 | /* | |
265 | * Wait till in foreground, in case someone | |
266 | * stupidly runs | |
267 | * csh & | |
268 | * dont want to try to grab away the tty. | |
269 | */ | |
270 | if (isatty(FSHDIAG)) | |
271 | f = FSHDIAG; | |
272 | else if (isatty(FSHOUT)) | |
273 | f = FSHOUT; | |
274 | else if (isatty(OLDSTD)) | |
275 | f = OLDSTD; | |
276 | else | |
277 | f = -1; | |
278 | retry: | |
279 | if (ioctl(f, TIOCGPGRP, &tpgrp) == 0 && tpgrp != -1) { | |
280 | int ldisc; | |
281 | if (tpgrp != shpgrp) { | |
d33af40e | 282 | int (*old)() = signal(SIGTTIN, SIG_DFL); |
04d3b78c | 283 | kill(0, SIGTTIN); |
d33af40e | 284 | signal(SIGTTIN, old); |
04d3b78c BJ |
285 | goto retry; |
286 | } | |
287 | if (ioctl(f, TIOCGETD, &oldisc) != 0) | |
288 | goto notty; | |
289 | if (oldisc != NTTYDISC) { | |
d7929fa7 KM |
290 | #ifdef DEBUG |
291 | printf("Switching to new tty driver...\n"); | |
292 | #endif DEBUG | |
04d3b78c BJ |
293 | ldisc = NTTYDISC; |
294 | ioctl(f, TIOCSETD, &ldisc); | |
295 | } else | |
296 | oldisc = -1; | |
297 | opgrp = shpgrp; | |
298 | shpgrp = getpid(); | |
299 | tpgrp = shpgrp; | |
300 | ioctl(f, TIOCSPGRP, &shpgrp); | |
301 | setpgrp(0, shpgrp); | |
302 | dcopy(f, FSHTTY); | |
303 | ioctl(FSHTTY, FIOCLEX, 0); | |
304 | } else { | |
305 | notty: | |
306 | printf("Warning: no access to tty; thus no job control in this shell...\n"); | |
307 | tpgrp = -1; | |
308 | } | |
309 | } | |
310 | } | |
3b1a0a1e KM |
311 | if (setintr == 0 && parintr == SIG_DFL) |
312 | setintr++; | |
d33af40e | 313 | signal(SIGCHLD, pchild); /* while signals not ready */ |
04d3b78c BJ |
314 | |
315 | /* | |
316 | * Set an exit here in case of an interrupt or error reading | |
317 | * the shell start-up scripts. | |
318 | */ | |
319 | setexit(); | |
320 | haderr = 0; /* In case second time through */ | |
321 | if (!fast && reenter == 0) { | |
322 | reenter++; | |
323 | /* Will have value("home") here because set fast if don't */ | |
324 | srccat(value("home"), "/.cshrc"); | |
325 | if (!fast && !arginp && !onelflg) | |
326 | dohash(); | |
d7929fa7 | 327 | dosource(loadhist); |
04d3b78c | 328 | if (loginsh) { |
04d3b78c BJ |
329 | srccat(value("home"), "/.login"); |
330 | } | |
331 | } | |
332 | ||
333 | /* | |
334 | * Now are ready for the -v and -x flags | |
335 | */ | |
336 | if (nverbose) | |
337 | setNS("verbose"); | |
338 | if (nexececho) | |
339 | setNS("echo"); | |
340 | ||
341 | /* | |
342 | * All the rest of the world is inside this call. | |
343 | * The argument to process indicates whether it should | |
344 | * catch "error unwinds". Thus if we are a interactive shell | |
345 | * our call here will never return by being blown past on an error. | |
346 | */ | |
347 | process(setintr); | |
348 | ||
349 | /* | |
350 | * Mop-up. | |
351 | */ | |
352 | if (loginsh) { | |
353 | printf("logout\n"); | |
354 | close(SHIN); | |
355 | child++; | |
356 | goodbye(); | |
357 | } | |
d7929fa7 | 358 | rechist(); |
04d3b78c BJ |
359 | exitstat(); |
360 | } | |
361 | ||
362 | untty() | |
363 | { | |
364 | ||
365 | if (tpgrp > 0) { | |
366 | setpgrp(0, opgrp); | |
367 | ioctl(FSHTTY, TIOCSPGRP, &opgrp); | |
368 | if (oldisc != -1 && oldisc != NTTYDISC) { | |
d7929fa7 | 369 | #ifdef DEBUG |
04d3b78c | 370 | printf("\nReverting to old tty driver...\n"); |
d7929fa7 | 371 | #endif DEBUG |
04d3b78c BJ |
372 | ioctl(FSHTTY, TIOCSETD, &oldisc); |
373 | } | |
374 | } | |
375 | } | |
376 | ||
377 | importpath(cp) | |
ec1a81af | 378 | char *cp; |
04d3b78c BJ |
379 | { |
380 | register int i = 0; | |
381 | register char *dp; | |
382 | register char **pv; | |
383 | int c; | |
384 | static char dot[2] = {'.', 0}; | |
385 | ||
386 | for (dp = cp; *dp; dp++) | |
387 | if (*dp == ':') | |
388 | i++; | |
389 | /* | |
390 | * i+2 where i is the number of colons in the path. | |
391 | * There are i+1 directories in the path plus we need | |
392 | * room for a zero terminator. | |
393 | */ | |
394 | pv = (char **) calloc(i+2, sizeof (char **)); | |
395 | dp = cp; | |
396 | i = 0; | |
397 | if (*dp) | |
398 | for (;;) { | |
399 | if ((c = *dp) == ':' || c == 0) { | |
400 | *dp = 0; | |
401 | pv[i++] = savestr(*cp ? cp : dot); | |
402 | if (c) { | |
403 | cp = dp + 1; | |
404 | *dp = ':'; | |
405 | } else | |
406 | break; | |
407 | } | |
408 | dp++; | |
409 | } | |
410 | pv[i] = 0; | |
411 | set1("path", pv, &shvhed); | |
412 | } | |
413 | ||
414 | /* | |
415 | * Source to the file which is the catenation of the argument names. | |
416 | */ | |
417 | srccat(cp, dp) | |
418 | char *cp, *dp; | |
419 | { | |
420 | register char *ep = strspl(cp, dp); | |
421 | register int unit = dmove(open(ep, 0), -1); | |
422 | ||
423 | /* ioctl(unit, FIOCLEX, NULL); */ | |
424 | xfree(ep); | |
425 | #ifdef INGRES | |
d7929fa7 | 426 | srcunit(unit, 0, 0); |
04d3b78c | 427 | #else |
d7929fa7 | 428 | srcunit(unit, 1, 0); |
04d3b78c BJ |
429 | #endif |
430 | } | |
431 | ||
432 | /* | |
433 | * Source to a unit. If onlyown it must be our file or our group or | |
434 | * we don't chance it. This occurs on ".cshrc"s and the like. | |
435 | */ | |
d7929fa7 | 436 | srcunit(unit, onlyown, hflg) |
04d3b78c BJ |
437 | register int unit; |
438 | bool onlyown; | |
d7929fa7 | 439 | bool hflg; |
04d3b78c BJ |
440 | { |
441 | /* We have to push down a lot of state here */ | |
442 | /* All this could go into a structure */ | |
443 | int oSHIN = -1, oldintty = intty; | |
444 | struct whyle *oldwhyl = whyles; | |
445 | char *ogointr = gointr, *oarginp = arginp; | |
446 | char *oevalp = evalp, **oevalvec = evalvec; | |
447 | int oonelflg = onelflg; | |
d7929fa7 KM |
448 | bool oenterhist = enterhist; |
449 | char OHIST = HIST; | |
04d3b78c BJ |
450 | #ifdef TELL |
451 | bool otell = cantell; | |
452 | #endif | |
453 | struct Bin saveB; | |
454 | ||
455 | /* The (few) real local variables */ | |
456 | jmp_buf oldexit; | |
d33af40e | 457 | int reenter, omask; |
04d3b78c BJ |
458 | |
459 | if (unit < 0) | |
460 | return; | |
461 | if (didfds) | |
462 | donefds(); | |
463 | if (onlyown) { | |
464 | struct stat stb; | |
465 | ||
ec1a81af SL |
466 | if (fstat(unit, &stb) < 0 || |
467 | (stb.st_uid != uid && stb.st_gid != getgid())) { | |
04d3b78c BJ |
468 | close(unit); |
469 | return; | |
470 | } | |
471 | } | |
472 | ||
473 | /* | |
474 | * There is a critical section here while we are pushing down the | |
475 | * input stream since we have stuff in different structures. | |
476 | * If we weren't careful an interrupt could corrupt SHIN's Bin | |
477 | * structure and kill the shell. | |
478 | * | |
479 | * We could avoid the critical region by grouping all the stuff | |
480 | * in a single structure and pointing at it to move it all at | |
481 | * once. This is less efficient globally on many variable references | |
482 | * however. | |
483 | */ | |
484 | getexit(oldexit); | |
485 | reenter = 0; | |
486 | if (setintr) | |
d33af40e | 487 | omask = sigblock(sigmask(SIGINT)); |
04d3b78c BJ |
488 | setexit(); |
489 | reenter++; | |
490 | if (reenter == 1) { | |
491 | /* Setup the new values of the state stuff saved above */ | |
492 | copy((char *)&saveB, (char *)&B, sizeof saveB); | |
493 | fbuf = (char **) 0; | |
494 | fseekp = feobp = fblocks = 0; | |
495 | oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0; | |
496 | intty = isatty(SHIN), whyles = 0, gointr = 0; | |
497 | evalvec = 0; evalp = 0; | |
d7929fa7 KM |
498 | enterhist = hflg; |
499 | if (enterhist) | |
500 | HIST = '\0'; | |
04d3b78c BJ |
501 | /* |
502 | * Now if we are allowing commands to be interrupted, | |
503 | * we let ourselves be interrupted. | |
504 | */ | |
505 | if (setintr) | |
d33af40e | 506 | sigsetmask(omask); |
04d3b78c BJ |
507 | #ifdef TELL |
508 | settell(); | |
509 | #endif | |
510 | process(0); /* 0 -> blow away on errors */ | |
511 | } | |
512 | if (setintr) | |
d33af40e | 513 | sigsetmask(omask); |
04d3b78c BJ |
514 | if (oSHIN >= 0) { |
515 | register int i; | |
516 | ||
517 | /* We made it to the new state... free up its storage */ | |
518 | /* This code could get run twice but xfree doesn't care */ | |
519 | for (i = 0; i < fblocks; i++) | |
520 | xfree(fbuf[i]); | |
521 | xfree((char *)fbuf); | |
522 | ||
523 | /* Reset input arena */ | |
524 | copy((char *)&B, (char *)&saveB, sizeof B); | |
525 | ||
526 | close(SHIN), SHIN = oSHIN; | |
527 | arginp = oarginp, onelflg = oonelflg; | |
528 | evalp = oevalp, evalvec = oevalvec; | |
529 | intty = oldintty, whyles = oldwhyl, gointr = ogointr; | |
020d9a25 KM |
530 | if (enterhist) |
531 | HIST = OHIST; | |
d7929fa7 | 532 | enterhist = oenterhist; |
04d3b78c BJ |
533 | #ifdef TELL |
534 | cantell = otell; | |
535 | #endif | |
536 | } | |
537 | ||
538 | resexit(oldexit); | |
539 | /* | |
540 | * If process reset() (effectively an unwind) then | |
541 | * we must also unwind. | |
542 | */ | |
543 | if (reenter >= 2) | |
544 | error(NOSTR); | |
545 | } | |
546 | ||
d7929fa7 | 547 | rechist() |
04d3b78c | 548 | { |
63af20f7 KM |
549 | char buf[BUFSIZ]; |
550 | int fp, ftmp, oldidfds; | |
04d3b78c | 551 | |
d7929fa7 | 552 | if (!fast) { |
6ea8dfee KM |
553 | if (value("savehist")[0] == '\0') |
554 | return; | |
63af20f7 KM |
555 | strcpy(buf, value("home")); |
556 | strcat(buf, "/.history"); | |
14f52162 | 557 | fp = creat(buf, 0666); |
6ea8dfee KM |
558 | if (fp == -1) |
559 | return; | |
560 | oldidfds = didfds; | |
561 | didfds = 0; | |
562 | ftmp = SHOUT; | |
563 | SHOUT = fp; | |
564 | strcpy(buf, value("savehist")); | |
565 | dumphist[2] = buf; | |
566 | dohist(dumphist); | |
567 | close(fp); | |
568 | SHOUT = ftmp; | |
569 | didfds = oldidfds; | |
d7929fa7 KM |
570 | } |
571 | } | |
572 | ||
573 | goodbye() | |
574 | { | |
575 | if (loginsh) { | |
04d3b78c | 576 | signal(SIGQUIT, SIG_IGN); |
d33af40e | 577 | signal(SIGINT, SIG_IGN); |
04d3b78c BJ |
578 | signal(SIGTERM, SIG_IGN); |
579 | setintr = 0; /* No interrupts after "logout" */ | |
580 | if (adrof("home")) | |
581 | srccat(value("home"), "/.logout"); | |
582 | } | |
d7929fa7 | 583 | rechist(); |
04d3b78c BJ |
584 | exitstat(); |
585 | } | |
586 | ||
587 | exitstat() | |
588 | { | |
589 | ||
590 | /* | |
591 | * Note that if STATUS is corrupted (i.e. getn bombs) | |
592 | * then error will exit directly because we poke child here. | |
593 | * Otherwise we might continue unwarrantedly (sic). | |
594 | */ | |
595 | child++; | |
596 | exit(getn(value("status"))); | |
597 | } | |
598 | ||
d7929fa7 KM |
599 | /* |
600 | * in the event of a HUP we want to save the history | |
601 | */ | |
602 | phup() | |
603 | { | |
604 | rechist(); | |
605 | exit(1); | |
606 | } | |
607 | ||
04d3b78c BJ |
608 | char *jobargv[2] = { "jobs", 0 }; |
609 | /* | |
610 | * Catch an interrupt, e.g. during lexical input. | |
611 | * If we are an interactive shell, we reset the interrupt catch | |
612 | * immediately. In any case we drain the shell output, | |
613 | * and finally go through the normal error mechanism, which | |
614 | * gets a chance to make the shell go away. | |
615 | */ | |
616 | pintr() | |
401149be BJ |
617 | { |
618 | pintr1(1); | |
619 | } | |
620 | ||
621 | pintr1(wantnl) | |
622 | bool wantnl; | |
04d3b78c BJ |
623 | { |
624 | register char **v; | |
d33af40e | 625 | int omask; |
04d3b78c | 626 | |
d33af40e | 627 | omask = sigblock(0); |
04d3b78c | 628 | if (setintr) { |
d33af40e | 629 | sigsetmask(omask & ~sigmask(SIGINT)); |
04d3b78c BJ |
630 | if (pjobs) { |
631 | pjobs = 0; | |
632 | printf("\n"); | |
633 | dojobs(jobargv); | |
634 | bferr("Interrupted"); | |
635 | } | |
636 | } | |
d33af40e | 637 | sigsetmask(omask & ~sigmask(SIGCHLD)); |
04d3b78c BJ |
638 | draino(); |
639 | ||
640 | /* | |
641 | * If we have an active "onintr" then we search for the label. | |
642 | * Note that if one does "onintr -" then we shan't be interruptible | |
643 | * so we needn't worry about that here. | |
644 | */ | |
645 | if (gointr) { | |
646 | search(ZGOTO, 0, gointr); | |
647 | timflg = 0; | |
648 | if (v = pargv) | |
649 | pargv = 0, blkfree(v); | |
650 | if (v = gargv) | |
651 | gargv = 0, blkfree(v); | |
652 | reset(); | |
401149be | 653 | } else if (intty && wantnl) |
04d3b78c BJ |
654 | printf("\n"); /* Some like this, others don't */ |
655 | error(NOSTR); | |
656 | } | |
657 | ||
658 | /* | |
659 | * Process is the main driving routine for the shell. | |
660 | * It runs all command processing, except for those within { ... } | |
661 | * in expressions (which is run by a routine evalav in sh.exp.c which | |
662 | * is a stripped down process), and `...` evaluation which is run | |
663 | * also by a subset of this code in sh.glob.c in the routine backeval. | |
664 | * | |
665 | * The code here is a little strange because part of it is interruptible | |
666 | * and hence freeing of structures appears to occur when none is necessary | |
667 | * if this is ignored. | |
668 | * | |
669 | * Note that if catch is not set then we will unwind on any error. | |
670 | * If an end-of-file occurs, we return. | |
671 | */ | |
672 | process(catch) | |
673 | bool catch; | |
674 | { | |
675 | register char *cp; | |
676 | jmp_buf osetexit; | |
677 | struct command *t; | |
678 | ||
679 | getexit(osetexit); | |
680 | for (;;) { | |
681 | pendjob(); | |
682 | paraml.next = paraml.prev = ¶ml; | |
683 | paraml.word = ""; | |
684 | t = 0; | |
685 | setexit(); | |
63af20f7 | 686 | justpr = enterhist; /* execute if not entering history */ |
04d3b78c BJ |
687 | |
688 | /* | |
689 | * Interruptible during interactive reads | |
690 | */ | |
691 | if (setintr) | |
d33af40e | 692 | sigsetmask(sigblock(0) & ~sigmask(SIGINT)); |
04d3b78c BJ |
693 | |
694 | /* | |
695 | * For the sake of reset() | |
696 | */ | |
697 | freelex(¶ml), freesyn(t), t = 0; | |
698 | ||
699 | if (haderr) { | |
700 | if (!catch) { | |
701 | /* unwind */ | |
702 | doneinp = 0; | |
703 | resexit(osetexit); | |
704 | reset(); | |
705 | } | |
706 | haderr = 0; | |
707 | /* | |
708 | * Every error is eventually caught here or | |
709 | * the shell dies. It is at this | |
710 | * point that we clean up any left-over open | |
711 | * files, by closing all but a fixed number | |
712 | * of pre-defined files. Thus routines don't | |
713 | * have to worry about leaving files open due | |
714 | * to deeper errors... they will get closed here. | |
715 | */ | |
716 | closem(); | |
717 | continue; | |
718 | } | |
719 | if (doneinp) { | |
720 | doneinp = 0; | |
721 | break; | |
722 | } | |
723 | if (chkstop) | |
724 | chkstop--; | |
725 | if (neednote) | |
726 | pnote(); | |
c9166193 | 727 | if (intty && prompt && evalvec == 0) { |
04d3b78c BJ |
728 | mailchk(); |
729 | /* | |
730 | * If we are at the end of the input buffer | |
731 | * then we are going to read fresh stuff. | |
732 | * Otherwise, we are rereading input and don't | |
733 | * need or want to prompt. | |
734 | */ | |
735 | if (fseekp == feobp) | |
544d4ed6 | 736 | printprompt(); |
04d3b78c BJ |
737 | flush(); |
738 | } | |
739 | err = 0; | |
740 | ||
741 | /* | |
742 | * Echo not only on VERBOSE, but also with history expansion. | |
743 | * If there is a lexical error then we forego history echo. | |
744 | */ | |
d7929fa7 KM |
745 | if (lex(¶ml) && !err && intty || |
746 | adrof("verbose")) { | |
04d3b78c BJ |
747 | haderr = 1; |
748 | prlex(¶ml); | |
749 | haderr = 0; | |
750 | } | |
751 | ||
752 | /* | |
753 | * The parser may lose space if interrupted. | |
754 | */ | |
755 | if (setintr) | |
d33af40e | 756 | sigblock(sigmask(SIGINT)); |
04d3b78c BJ |
757 | |
758 | /* | |
63af20f7 KM |
759 | * Save input text on the history list if |
760 | * reading in old history, or it | |
04d3b78c BJ |
761 | * is from the terminal at the top level and not |
762 | * in a loop. | |
763 | */ | |
63af20f7 | 764 | if (enterhist || catch && intty && !whyles) |
04d3b78c BJ |
765 | savehist(¶ml); |
766 | ||
767 | /* | |
d7929fa7 KM |
768 | * Print lexical error messages, except when sourcing |
769 | * history lists. | |
04d3b78c | 770 | */ |
d7929fa7 | 771 | if (!enterhist && err) |
04d3b78c BJ |
772 | error(err); |
773 | ||
774 | /* | |
775 | * If had a history command :p modifier then | |
776 | * this is as far as we should go | |
777 | */ | |
778 | if (justpr) | |
779 | reset(); | |
780 | ||
781 | alias(¶ml); | |
782 | ||
783 | /* | |
784 | * Parse the words of the input into a parse tree. | |
785 | */ | |
786 | t = syntax(paraml.next, ¶ml, 0); | |
787 | if (err) | |
788 | error(err); | |
789 | ||
790 | /* | |
791 | * Execute the parse tree | |
792 | */ | |
793 | execute(t, tpgrp); | |
794 | ||
795 | /* | |
796 | * Made it! | |
797 | */ | |
798 | freelex(¶ml), freesyn(t); | |
799 | } | |
800 | resexit(osetexit); | |
801 | } | |
802 | ||
803 | dosource(t) | |
804 | register char **t; | |
805 | { | |
806 | register char *f; | |
807 | register int u; | |
d7929fa7 KM |
808 | bool hflg = 0; |
809 | char buf[BUFSIZ]; | |
04d3b78c BJ |
810 | |
811 | t++; | |
d7929fa7 KM |
812 | if (*t && eq(*t, "-h")) { |
813 | t++; | |
814 | hflg++; | |
815 | } | |
816 | strcpy(buf, *t); | |
817 | f = globone(buf); | |
04d3b78c BJ |
818 | u = dmove(open(f, 0), -1); |
819 | xfree(f); | |
d7929fa7 | 820 | if (u < 0 && !hflg) |
04d3b78c | 821 | Perror(f); |
d7929fa7 | 822 | srcunit(u, 0, hflg); |
04d3b78c BJ |
823 | } |
824 | ||
825 | /* | |
826 | * Check for mail. | |
827 | * If we are a login shell, then we don't want to tell | |
828 | * about any mail file unless its been modified | |
829 | * after the time we started. | |
830 | * This prevents us from telling the user things he already | |
831 | * knows, since the login program insists on saying | |
832 | * "You have mail." | |
833 | */ | |
834 | mailchk() | |
835 | { | |
836 | register struct varent *v; | |
837 | register char **vp; | |
838 | time_t t; | |
839 | int intvl, cnt; | |
840 | struct stat stb; | |
841 | bool new; | |
842 | ||
843 | v = adrof("mail"); | |
844 | if (v == 0) | |
845 | return; | |
846 | time(&t); | |
847 | vp = v->vec; | |
848 | cnt = blklen(vp); | |
849 | intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL; | |
850 | if (intvl < 1) | |
851 | intvl = 1; | |
852 | if (chktim + intvl > t) | |
853 | return; | |
854 | for (; *vp; vp++) { | |
855 | if (stat(*vp, &stb) < 0) | |
856 | continue; | |
ae3d9709 | 857 | new = stb.st_mtime > time0.tv_sec; |
04d3b78c BJ |
858 | if (stb.st_size == 0 || stb.st_atime > stb.st_mtime || |
859 | (stb.st_atime < chktim && stb.st_mtime < chktim) || | |
860 | loginsh && !new) | |
861 | continue; | |
862 | if (cnt == 1) | |
863 | printf("You have %smail.\n", new ? "new " : ""); | |
864 | else | |
865 | printf("%s in %s.\n", new ? "New mail" : "Mail", *vp); | |
866 | } | |
867 | chktim = t; | |
868 | } | |
869 | ||
870 | #include <pwd.h> | |
871 | /* | |
872 | * Extract a home directory from the password file | |
873 | * The argument points to a buffer where the name of the | |
874 | * user whose home directory is sought is currently. | |
875 | * We write the home directory of the user back there. | |
876 | */ | |
877 | gethdir(home) | |
878 | char *home; | |
879 | { | |
880 | register struct passwd *pp = getpwnam(home); | |
881 | ||
882 | if (pp == 0) | |
883 | return (1); | |
884 | strcpy(home, pp->pw_dir); | |
885 | return (0); | |
886 | } | |
887 | ||
888 | /* | |
889 | * Move the initial descriptors to their eventual | |
890 | * resting places, closin all other units. | |
891 | */ | |
892 | initdesc() | |
893 | { | |
894 | ||
895 | didcch = 0; /* Havent closed for child */ | |
896 | didfds = 0; /* 0, 1, 2 aren't set up */ | |
897 | SHIN = dcopy(0, FSHIN); | |
898 | SHOUT = dcopy(1, FSHOUT); | |
899 | SHDIAG = dcopy(2, FSHDIAG); | |
900 | OLDSTD = dcopy(SHIN, FOLDSTD); | |
901 | closem(); | |
902 | } | |
903 | ||
e31125a2 SL |
904 | #ifdef PROF |
905 | done(i) | |
906 | #else | |
04d3b78c | 907 | exit(i) |
e31125a2 | 908 | #endif |
04d3b78c BJ |
909 | int i; |
910 | { | |
911 | ||
912 | untty(); | |
913 | #ifdef PROF | |
e31125a2 | 914 | monitor(0); |
04d3b78c BJ |
915 | #else |
916 | _exit(i); | |
917 | #endif | |
918 | } | |
19d39288 | 919 | |
544d4ed6 | 920 | printprompt() |
19d39288 | 921 | { |
544d4ed6 SL |
922 | register char *cp; |
923 | ||
e31125a2 | 924 | if (!whyles) { |
544d4ed6 SL |
925 | for (cp = value("prompt"); *cp; cp++) |
926 | if (*cp == HIST) | |
927 | printf("%d", eventno + 1); | |
928 | else { | |
929 | if (*cp == '\\' && cp[1] == HIST) | |
930 | cp++; | |
931 | putchar(*cp | QUOTE); | |
932 | } | |
933 | } else | |
934 | /* | |
935 | * Prompt for forward reading loop | |
936 | * body content. | |
937 | */ | |
938 | printf("? "); | |
939 | flush(); | |
19d39288 | 940 | } |