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 |
fad613b5 | 8 | static char *sccsid = "@(#)csh.c 5.6 (Berkeley) %G%"; |
094e80ed | 9 | #endif |
04d3b78c BJ |
10 | |
11 | #include "sh.h" | |
12 | #include <sys/ioctl.h> | |
13 | /* | |
14 | * C Shell | |
15 | * | |
16 | * Bill Joy, UC Berkeley, California, USA | |
17 | * October 1978, May 1980 | |
18 | * | |
19 | * Jim Kulp, IIASA, Laxenburg, Austria | |
20 | * April 1980 | |
21 | */ | |
22 | ||
23 | char *pathlist[] = { ".", "/usr/ucb", "/bin", "/usr/bin", 0 }; | |
6ea8dfee | 24 | char *dumphist[] = { "history", "-h", 0, 0 }; |
d7929fa7 | 25 | char *loadhist[] = { "source", "-h", "~/.history", 0 }; |
04d3b78c BJ |
26 | char HIST = '!'; |
27 | char HISTSUB = '^'; | |
28 | bool nofile; | |
29 | bool reenter; | |
30 | bool nverbose; | |
31 | bool nexececho; | |
32 | bool quitit; | |
33 | bool fast; | |
f0bb61e3 | 34 | bool batch; |
04d3b78c | 35 | bool prompt = 1; |
63af20f7 | 36 | bool enterhist = 0; |
04d3b78c | 37 | |
00705acc JL |
38 | extern gid_t getegid(), getgid(); |
39 | extern uid_t geteuid(), getuid(); | |
40 | ||
04d3b78c BJ |
41 | main(c, av) |
42 | int c; | |
43 | char **av; | |
44 | { | |
45 | register char **v, *cp; | |
46 | register int f; | |
d33af40e | 47 | struct sigvec osv; |
04d3b78c BJ |
48 | |
49 | settimes(); /* Immed. estab. timing base */ | |
50 | v = av; | |
51 | if (eq(v[0], "a.out")) /* A.out's are quittable */ | |
52 | quitit = 1; | |
53 | uid = getuid(); | |
d33af40e | 54 | loginsh = **v == '-' && c == 1; |
04d3b78c | 55 | if (loginsh) |
35371dec | 56 | (void) time(&chktim); |
04d3b78c BJ |
57 | |
58 | /* | |
59 | * Move the descriptors to safe places. | |
60 | * The variable didfds is 0 while we have only FSH* to work with. | |
61 | * When didfds is true, we have 0,1,2 and prefer to use these. | |
62 | */ | |
63 | initdesc(); | |
64 | ||
65 | /* | |
66 | * Initialize the shell variables. | |
67 | * ARGV and PROMPT are initialized later. | |
68 | * STATUS is also munged in several places. | |
69 | * CHILD is munged when forking/waiting | |
70 | */ | |
71 | ||
72 | set("status", "0"); | |
73 | dinit(cp = getenv("HOME")); /* dinit thinks that HOME == cwd in a | |
74 | * login shell */ | |
75 | if (cp == NOSTR) | |
76 | fast++; /* No home -> can't read scripts */ | |
77 | else | |
78 | set("home", savestr(cp)); | |
79 | /* | |
80 | * Grab other useful things from the environment. | |
81 | * Should we grab everything?? | |
82 | */ | |
83 | if ((cp = getenv("USER")) != NOSTR) | |
84 | set("user", savestr(cp)); | |
85 | if ((cp = getenv("TERM")) != NOSTR) | |
86 | set("term", savestr(cp)); | |
87 | /* | |
88 | * Re-initialize path if set in environment | |
89 | */ | |
90 | if ((cp = getenv("PATH")) == NOSTR) | |
91 | set1("path", saveblk(pathlist), &shvhed); | |
35371dec EW |
92 | else |
93 | importpath(cp); | |
ccf0e0f5 | 94 | set("shell", SHELLPATH); |
04d3b78c BJ |
95 | |
96 | doldol = putn(getpid()); /* For $$ */ | |
97 | shtemp = strspl("/tmp/sh", doldol); /* For << */ | |
98 | ||
99 | /* | |
100 | * Record the interrupt states from the parent process. | |
101 | * If the parent is non-interruptible our hand must be forced | |
102 | * or we (and our children) won't be either. | |
103 | * Our children inherit termination from our parent. | |
104 | * We catch it only if we are the login shell. | |
105 | */ | |
35371dec EW |
106 | /* parents interruptibility */ |
107 | (void) sigvec(SIGINT, (struct sigvec *)0, &osv); | |
d33af40e | 108 | parintr = osv.sv_handler; |
35371dec EW |
109 | /* parents terminability */ |
110 | (void) sigvec(SIGTERM, (struct sigvec *)0, &osv); | |
d33af40e | 111 | parterm = osv.sv_handler; |
f66d6be5 | 112 | if (loginsh) { |
35371dec EW |
113 | (void) signal(SIGHUP, phup); /* exit processing on HUP */ |
114 | (void) signal(SIGXCPU, phup); /* ...and on XCPU */ | |
115 | (void) signal(SIGXFSZ, phup); /* ...and on XFSZ */ | |
f66d6be5 | 116 | } |
04d3b78c BJ |
117 | |
118 | /* | |
119 | * Process the arguments. | |
120 | * | |
121 | * Note that processing of -v/-x is actually delayed till after | |
122 | * script processing. | |
04d3b78c BJ |
123 | */ |
124 | c--, v++; | |
f0bb61e3 | 125 | while (c > 0 && (cp = v[0])[0] == '-' && *++cp != '\0' && !batch) { |
04d3b78c BJ |
126 | do switch (*cp++) { |
127 | ||
f0bb61e3 RC |
128 | case 'b': /* -b Next arg is input file */ |
129 | batch++; | |
130 | break; | |
131 | ||
04d3b78c BJ |
132 | case 'c': /* -c Command input from arg */ |
133 | if (c == 1) | |
134 | exit(0); | |
135 | c--, v++; | |
136 | arginp = v[0]; | |
137 | prompt = 0; | |
138 | nofile++; | |
139 | break; | |
140 | ||
141 | case 'e': /* -e Exit on any error */ | |
142 | exiterr++; | |
143 | break; | |
144 | ||
145 | case 'f': /* -f Fast start */ | |
146 | fast++; | |
147 | break; | |
148 | ||
149 | case 'i': /* -i Interactive, even if !intty */ | |
150 | intact++; | |
151 | nofile++; | |
152 | break; | |
153 | ||
154 | case 'n': /* -n Don't execute */ | |
155 | noexec++; | |
156 | break; | |
157 | ||
158 | case 'q': /* -q (Undoc'd) ... die on quit */ | |
159 | quitit = 1; | |
160 | break; | |
161 | ||
162 | case 's': /* -s Read from std input */ | |
163 | nofile++; | |
164 | break; | |
165 | ||
166 | case 't': /* -t Read one line from input */ | |
167 | onelflg = 2; | |
168 | prompt = 0; | |
169 | nofile++; | |
170 | break; | |
171 | ||
172 | case 'v': /* -v Echo hist expanded input */ | |
173 | nverbose = 1; /* ... later */ | |
174 | break; | |
175 | ||
176 | case 'x': /* -x Echo just before execution */ | |
177 | nexececho = 1; /* ... later */ | |
178 | break; | |
179 | ||
180 | case 'V': /* -V Echo hist expanded input */ | |
181 | setNS("verbose"); /* NOW! */ | |
182 | break; | |
183 | ||
184 | case 'X': /* -X Echo just before execution */ | |
185 | setNS("echo"); /* NOW! */ | |
186 | break; | |
187 | ||
188 | } while (*cp); | |
189 | v++, c--; | |
190 | } | |
191 | ||
192 | if (quitit) /* With all due haste, for debugging */ | |
35371dec | 193 | (void) signal(SIGQUIT, SIG_DFL); |
04d3b78c BJ |
194 | |
195 | /* | |
f0bb61e3 | 196 | * Unless prevented by -c, -i, -s, or -t, if there |
04d3b78c BJ |
197 | * are remaining arguments the first of them is the name |
198 | * of a shell file from which to read commands. | |
199 | */ | |
200 | if (nofile == 0 && c > 0) { | |
201 | nofile = open(v[0], 0); | |
202 | if (nofile < 0) { | |
203 | child++; /* So this ... */ | |
204 | Perror(v[0]); /* ... doesn't return */ | |
205 | } | |
206 | file = v[0]; | |
207 | SHIN = dmove(nofile, FSHIN); /* Replace FSHIN */ | |
35371dec | 208 | (void) ioctl(SHIN, FIOCLEX, (char *)0); |
04d3b78c BJ |
209 | prompt = 0; |
210 | c--, v++; | |
211 | } | |
dee2e6bb | 212 | if (!batch && (uid != geteuid() || getgid() != getegid())) { |
f0bb61e3 RC |
213 | errno = EACCES; |
214 | child++; /* So this ... */ | |
215 | Perror("csh"); /* ... doesn't return */ | |
216 | } | |
04d3b78c BJ |
217 | /* |
218 | * Consider input a tty if it really is or we are interactive. | |
219 | */ | |
220 | intty = intact || isatty(SHIN); | |
221 | /* | |
222 | * Decide whether we should play with signals or not. | |
223 | * If we are explicitly told (via -i, or -) or we are a login | |
224 | * shell (arg0 starts with -) or the input and output are both | |
225 | * the ttys("csh", or "csh</dev/ttyx>/dev/ttyx") | |
226 | * Note that in only the login shell is it likely that parent | |
227 | * may have set signals to be ignored | |
228 | */ | |
3b1a0a1e | 229 | if (loginsh || intact || intty && isatty(SHOUT)) |
04d3b78c BJ |
230 | setintr = 1; |
231 | #ifdef TELL | |
232 | settell(); | |
233 | #endif | |
234 | /* | |
235 | * Save the remaining arguments in argv. | |
236 | */ | |
237 | setq("argv", v, &shvhed); | |
238 | ||
239 | /* | |
240 | * Set up the prompt. | |
241 | */ | |
242 | if (prompt) | |
243 | set("prompt", uid == 0 ? "# " : "% "); | |
244 | ||
245 | /* | |
246 | * If we are an interactive shell, then start fiddling | |
247 | * with the signals; this is a tricky game. | |
248 | */ | |
249 | shpgrp = getpgrp(0); | |
250 | opgrp = tpgrp = -1; | |
251 | oldisc = -1; | |
252 | if (setintr) { | |
253 | **av = '-'; | |
254 | if (!quitit) /* Wary! */ | |
35371dec EW |
255 | (void) signal(SIGQUIT, SIG_IGN); |
256 | (void) signal(SIGINT, pintr); | |
257 | (void) sigblock(sigmask(SIGINT)); | |
258 | (void) signal(SIGTERM, SIG_IGN); | |
04d3b78c | 259 | if (quitit == 0 && arginp == 0) { |
35371dec EW |
260 | (void) signal(SIGTSTP, SIG_IGN); |
261 | (void) signal(SIGTTIN, SIG_IGN); | |
262 | (void) signal(SIGTTOU, SIG_IGN); | |
04d3b78c BJ |
263 | /* |
264 | * Wait till in foreground, in case someone | |
265 | * stupidly runs | |
266 | * csh & | |
267 | * dont want to try to grab away the tty. | |
268 | */ | |
269 | if (isatty(FSHDIAG)) | |
270 | f = FSHDIAG; | |
271 | else if (isatty(FSHOUT)) | |
272 | f = FSHOUT; | |
273 | else if (isatty(OLDSTD)) | |
274 | f = OLDSTD; | |
275 | else | |
276 | f = -1; | |
277 | retry: | |
35371dec EW |
278 | if (ioctl(f, TIOCGPGRP, (char *)&tpgrp) == 0 && |
279 | tpgrp != -1) { | |
04d3b78c BJ |
280 | int ldisc; |
281 | if (tpgrp != shpgrp) { | |
d33af40e | 282 | int (*old)() = signal(SIGTTIN, SIG_DFL); |
35371dec EW |
283 | (void) kill(0, SIGTTIN); |
284 | (void) signal(SIGTTIN, old); | |
04d3b78c BJ |
285 | goto retry; |
286 | } | |
35371dec | 287 | if (ioctl(f, TIOCGETD, (char *)&oldisc) != 0) |
04d3b78c BJ |
288 | goto notty; |
289 | if (oldisc != NTTYDISC) { | |
d7929fa7 KM |
290 | #ifdef DEBUG |
291 | printf("Switching to new tty driver...\n"); | |
292 | #endif DEBUG | |
04d3b78c | 293 | ldisc = NTTYDISC; |
35371dec EW |
294 | (void) ioctl(f, TIOCSETD, |
295 | (char *)&ldisc); | |
04d3b78c BJ |
296 | } else |
297 | oldisc = -1; | |
298 | opgrp = shpgrp; | |
299 | shpgrp = getpid(); | |
300 | tpgrp = shpgrp; | |
35371dec EW |
301 | (void) ioctl(f, TIOCSPGRP, (char *)&shpgrp); |
302 | (void) setpgrp(0, shpgrp); | |
303 | (void) ioctl(dcopy(f, FSHTTY), FIOCLEX, | |
304 | (char *)0); | |
04d3b78c BJ |
305 | } else { |
306 | notty: | |
307 | printf("Warning: no access to tty; thus no job control in this shell...\n"); | |
308 | tpgrp = -1; | |
309 | } | |
310 | } | |
311 | } | |
3b1a0a1e KM |
312 | if (setintr == 0 && parintr == SIG_DFL) |
313 | setintr++; | |
35371dec | 314 | (void) signal(SIGCHLD, pchild); /* while signals not ready */ |
04d3b78c BJ |
315 | |
316 | /* | |
317 | * Set an exit here in case of an interrupt or error reading | |
318 | * the shell start-up scripts. | |
319 | */ | |
320 | setexit(); | |
321 | haderr = 0; /* In case second time through */ | |
322 | if (!fast && reenter == 0) { | |
323 | reenter++; | |
324 | /* Will have value("home") here because set fast if don't */ | |
325 | srccat(value("home"), "/.cshrc"); | |
35371dec | 326 | if (!fast && !arginp && !onelflg && !havhash) |
04d3b78c BJ |
327 | dohash(); |
328 | if (loginsh) { | |
04d3b78c BJ |
329 | srccat(value("home"), "/.login"); |
330 | } | |
5eaf2044 | 331 | dosource(loadhist); |
04d3b78c BJ |
332 | } |
333 | ||
334 | /* | |
335 | * Now are ready for the -v and -x flags | |
336 | */ | |
337 | if (nverbose) | |
338 | setNS("verbose"); | |
339 | if (nexececho) | |
340 | setNS("echo"); | |
341 | ||
342 | /* | |
343 | * All the rest of the world is inside this call. | |
344 | * The argument to process indicates whether it should | |
345 | * catch "error unwinds". Thus if we are a interactive shell | |
346 | * our call here will never return by being blown past on an error. | |
347 | */ | |
348 | process(setintr); | |
349 | ||
350 | /* | |
351 | * Mop-up. | |
352 | */ | |
353 | if (loginsh) { | |
354 | printf("logout\n"); | |
35371dec | 355 | (void) close(SHIN); |
04d3b78c BJ |
356 | child++; |
357 | goodbye(); | |
358 | } | |
d7929fa7 | 359 | rechist(); |
04d3b78c BJ |
360 | exitstat(); |
361 | } | |
362 | ||
363 | untty() | |
364 | { | |
365 | ||
366 | if (tpgrp > 0) { | |
35371dec EW |
367 | (void) setpgrp(0, opgrp); |
368 | (void) ioctl(FSHTTY, TIOCSPGRP, (char *)&opgrp); | |
04d3b78c | 369 | if (oldisc != -1 && oldisc != NTTYDISC) { |
d7929fa7 | 370 | #ifdef DEBUG |
04d3b78c | 371 | printf("\nReverting to old tty driver...\n"); |
d7929fa7 | 372 | #endif DEBUG |
35371dec | 373 | (void) ioctl(FSHTTY, TIOCSETD, (char *)&oldisc); |
04d3b78c BJ |
374 | } |
375 | } | |
376 | } | |
377 | ||
378 | importpath(cp) | |
ec1a81af | 379 | char *cp; |
04d3b78c BJ |
380 | { |
381 | register int i = 0; | |
382 | register char *dp; | |
383 | register char **pv; | |
384 | int c; | |
385 | static char dot[2] = {'.', 0}; | |
386 | ||
387 | for (dp = cp; *dp; dp++) | |
388 | if (*dp == ':') | |
389 | i++; | |
390 | /* | |
391 | * i+2 where i is the number of colons in the path. | |
392 | * There are i+1 directories in the path plus we need | |
393 | * room for a zero terminator. | |
394 | */ | |
35371dec | 395 | pv = (char **) calloc((unsigned) (i + 2), sizeof (char **)); |
04d3b78c BJ |
396 | dp = cp; |
397 | i = 0; | |
398 | if (*dp) | |
399 | for (;;) { | |
400 | if ((c = *dp) == ':' || c == 0) { | |
401 | *dp = 0; | |
402 | pv[i++] = savestr(*cp ? cp : dot); | |
403 | if (c) { | |
404 | cp = dp + 1; | |
405 | *dp = ':'; | |
406 | } else | |
407 | break; | |
408 | } | |
409 | dp++; | |
410 | } | |
411 | pv[i] = 0; | |
412 | set1("path", pv, &shvhed); | |
413 | } | |
414 | ||
415 | /* | |
416 | * Source to the file which is the catenation of the argument names. | |
417 | */ | |
418 | srccat(cp, dp) | |
419 | char *cp, *dp; | |
420 | { | |
421 | register char *ep = strspl(cp, dp); | |
422 | register int unit = dmove(open(ep, 0), -1); | |
423 | ||
35371dec | 424 | (void) ioctl(unit, FIOCLEX, (char *)0); |
04d3b78c BJ |
425 | xfree(ep); |
426 | #ifdef INGRES | |
d7929fa7 | 427 | srcunit(unit, 0, 0); |
04d3b78c | 428 | #else |
d7929fa7 | 429 | srcunit(unit, 1, 0); |
04d3b78c BJ |
430 | #endif |
431 | } | |
432 | ||
433 | /* | |
434 | * Source to a unit. If onlyown it must be our file or our group or | |
435 | * we don't chance it. This occurs on ".cshrc"s and the like. | |
436 | */ | |
470cb5e7 KB |
437 | int insource; |
438 | static | |
d7929fa7 | 439 | srcunit(unit, onlyown, hflg) |
04d3b78c BJ |
440 | register int unit; |
441 | bool onlyown; | |
d7929fa7 | 442 | bool hflg; |
04d3b78c BJ |
443 | { |
444 | /* We have to push down a lot of state here */ | |
445 | /* All this could go into a structure */ | |
446 | int oSHIN = -1, oldintty = intty; | |
447 | struct whyle *oldwhyl = whyles; | |
448 | char *ogointr = gointr, *oarginp = arginp; | |
449 | char *oevalp = evalp, **oevalvec = evalvec; | |
450 | int oonelflg = onelflg; | |
d7929fa7 KM |
451 | bool oenterhist = enterhist; |
452 | char OHIST = HIST; | |
04d3b78c BJ |
453 | #ifdef TELL |
454 | bool otell = cantell; | |
455 | #endif | |
456 | struct Bin saveB; | |
457 | ||
458 | /* The (few) real local variables */ | |
459 | jmp_buf oldexit; | |
1f7b623f KB |
460 | int reenter; |
461 | long omask; | |
04d3b78c BJ |
462 | |
463 | if (unit < 0) | |
464 | return; | |
465 | if (didfds) | |
466 | donefds(); | |
467 | if (onlyown) { | |
468 | struct stat stb; | |
469 | ||
ec1a81af SL |
470 | if (fstat(unit, &stb) < 0 || |
471 | (stb.st_uid != uid && stb.st_gid != getgid())) { | |
35371dec | 472 | (void) close(unit); |
04d3b78c BJ |
473 | return; |
474 | } | |
475 | } | |
476 | ||
477 | /* | |
478 | * There is a critical section here while we are pushing down the | |
479 | * input stream since we have stuff in different structures. | |
480 | * If we weren't careful an interrupt could corrupt SHIN's Bin | |
481 | * structure and kill the shell. | |
482 | * | |
483 | * We could avoid the critical region by grouping all the stuff | |
484 | * in a single structure and pointing at it to move it all at | |
485 | * once. This is less efficient globally on many variable references | |
486 | * however. | |
487 | */ | |
470cb5e7 | 488 | insource = 1; |
04d3b78c BJ |
489 | getexit(oldexit); |
490 | reenter = 0; | |
491 | if (setintr) | |
d33af40e | 492 | omask = sigblock(sigmask(SIGINT)); |
04d3b78c BJ |
493 | setexit(); |
494 | reenter++; | |
495 | if (reenter == 1) { | |
496 | /* Setup the new values of the state stuff saved above */ | |
497 | copy((char *)&saveB, (char *)&B, sizeof saveB); | |
498 | fbuf = (char **) 0; | |
499 | fseekp = feobp = fblocks = 0; | |
500 | oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0; | |
501 | intty = isatty(SHIN), whyles = 0, gointr = 0; | |
502 | evalvec = 0; evalp = 0; | |
d7929fa7 KM |
503 | enterhist = hflg; |
504 | if (enterhist) | |
505 | HIST = '\0'; | |
04d3b78c BJ |
506 | /* |
507 | * Now if we are allowing commands to be interrupted, | |
508 | * we let ourselves be interrupted. | |
509 | */ | |
510 | if (setintr) | |
35371dec | 511 | (void) sigsetmask(omask); |
04d3b78c BJ |
512 | #ifdef TELL |
513 | settell(); | |
514 | #endif | |
515 | process(0); /* 0 -> blow away on errors */ | |
516 | } | |
517 | if (setintr) | |
35371dec | 518 | (void) sigsetmask(omask); |
04d3b78c BJ |
519 | if (oSHIN >= 0) { |
520 | register int i; | |
521 | ||
522 | /* We made it to the new state... free up its storage */ | |
523 | /* This code could get run twice but xfree doesn't care */ | |
524 | for (i = 0; i < fblocks; i++) | |
525 | xfree(fbuf[i]); | |
526 | xfree((char *)fbuf); | |
527 | ||
528 | /* Reset input arena */ | |
529 | copy((char *)&B, (char *)&saveB, sizeof B); | |
530 | ||
35371dec | 531 | (void) close(SHIN), SHIN = oSHIN; |
04d3b78c BJ |
532 | arginp = oarginp, onelflg = oonelflg; |
533 | evalp = oevalp, evalvec = oevalvec; | |
534 | intty = oldintty, whyles = oldwhyl, gointr = ogointr; | |
020d9a25 KM |
535 | if (enterhist) |
536 | HIST = OHIST; | |
d7929fa7 | 537 | enterhist = oenterhist; |
04d3b78c BJ |
538 | #ifdef TELL |
539 | cantell = otell; | |
540 | #endif | |
541 | } | |
542 | ||
543 | resexit(oldexit); | |
544 | /* | |
545 | * If process reset() (effectively an unwind) then | |
546 | * we must also unwind. | |
547 | */ | |
548 | if (reenter >= 2) | |
549 | error(NOSTR); | |
470cb5e7 | 550 | insource = 0; |
04d3b78c BJ |
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; | |
35371dec EW |
561 | (void) strcpy(buf, value("home")); |
562 | (void) 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; | |
35371dec | 570 | (void) strcpy(buf, value("savehist")); |
6ea8dfee KM |
571 | dumphist[2] = buf; |
572 | dohist(dumphist); | |
35371dec | 573 | (void) close(fp); |
6ea8dfee KM |
574 | SHOUT = ftmp; |
575 | didfds = oldidfds; | |
d7929fa7 KM |
576 | } |
577 | } | |
578 | ||
579 | goodbye() | |
580 | { | |
581 | if (loginsh) { | |
35371dec EW |
582 | (void) signal(SIGQUIT, SIG_IGN); |
583 | (void) signal(SIGINT, SIG_IGN); | |
584 | (void) signal(SIGTERM, SIG_IGN); | |
04d3b78c BJ |
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 | ||
35371dec EW |
596 | #ifdef PROF |
597 | monitor(0); | |
598 | #endif | |
04d3b78c BJ |
599 | /* |
600 | * Note that if STATUS is corrupted (i.e. getn bombs) | |
601 | * then error will exit directly because we poke child here. | |
602 | * Otherwise we might continue unwarrantedly (sic). | |
603 | */ | |
604 | child++; | |
605 | exit(getn(value("status"))); | |
606 | } | |
607 | ||
d7929fa7 KM |
608 | /* |
609 | * in the event of a HUP we want to save the history | |
610 | */ | |
611 | phup() | |
612 | { | |
613 | rechist(); | |
614 | exit(1); | |
615 | } | |
616 | ||
04d3b78c BJ |
617 | char *jobargv[2] = { "jobs", 0 }; |
618 | /* | |
619 | * Catch an interrupt, e.g. during lexical input. | |
620 | * If we are an interactive shell, we reset the interrupt catch | |
621 | * immediately. In any case we drain the shell output, | |
622 | * and finally go through the normal error mechanism, which | |
623 | * gets a chance to make the shell go away. | |
624 | */ | |
625 | pintr() | |
401149be BJ |
626 | { |
627 | pintr1(1); | |
628 | } | |
629 | ||
630 | pintr1(wantnl) | |
631 | bool wantnl; | |
04d3b78c BJ |
632 | { |
633 | register char **v; | |
1f7b623f | 634 | long omask; |
04d3b78c | 635 | |
1f7b623f | 636 | omask = sigblock(0L); |
04d3b78c | 637 | if (setintr) { |
35371dec | 638 | (void) sigsetmask(omask & ~sigmask(SIGINT)); |
04d3b78c BJ |
639 | if (pjobs) { |
640 | pjobs = 0; | |
641 | printf("\n"); | |
642 | dojobs(jobargv); | |
643 | bferr("Interrupted"); | |
644 | } | |
645 | } | |
35371dec | 646 | (void) sigsetmask(omask & ~sigmask(SIGCHLD)); |
04d3b78c BJ |
647 | draino(); |
648 | ||
649 | /* | |
650 | * If we have an active "onintr" then we search for the label. | |
651 | * Note that if one does "onintr -" then we shan't be interruptible | |
652 | * so we needn't worry about that here. | |
653 | */ | |
654 | if (gointr) { | |
655 | search(ZGOTO, 0, gointr); | |
656 | timflg = 0; | |
657 | if (v = pargv) | |
658 | pargv = 0, blkfree(v); | |
659 | if (v = gargv) | |
660 | gargv = 0, blkfree(v); | |
661 | reset(); | |
401149be | 662 | } else if (intty && wantnl) |
04d3b78c BJ |
663 | printf("\n"); /* Some like this, others don't */ |
664 | error(NOSTR); | |
665 | } | |
666 | ||
667 | /* | |
668 | * Process is the main driving routine for the shell. | |
669 | * It runs all command processing, except for those within { ... } | |
670 | * in expressions (which is run by a routine evalav in sh.exp.c which | |
671 | * is a stripped down process), and `...` evaluation which is run | |
672 | * also by a subset of this code in sh.glob.c in the routine backeval. | |
673 | * | |
674 | * The code here is a little strange because part of it is interruptible | |
675 | * and hence freeing of structures appears to occur when none is necessary | |
676 | * if this is ignored. | |
677 | * | |
678 | * Note that if catch is not set then we will unwind on any error. | |
679 | * If an end-of-file occurs, we return. | |
680 | */ | |
681 | process(catch) | |
682 | bool catch; | |
683 | { | |
04d3b78c | 684 | jmp_buf osetexit; |
35371dec | 685 | register struct command *t; |
04d3b78c BJ |
686 | |
687 | getexit(osetexit); | |
688 | for (;;) { | |
689 | pendjob(); | |
690 | paraml.next = paraml.prev = ¶ml; | |
691 | paraml.word = ""; | |
692 | t = 0; | |
693 | setexit(); | |
63af20f7 | 694 | justpr = enterhist; /* execute if not entering history */ |
04d3b78c BJ |
695 | |
696 | /* | |
697 | * Interruptible during interactive reads | |
698 | */ | |
699 | if (setintr) | |
1f7b623f | 700 | (void) sigsetmask(sigblock(0L) & ~sigmask(SIGINT)); |
04d3b78c BJ |
701 | |
702 | /* | |
703 | * For the sake of reset() | |
704 | */ | |
705 | freelex(¶ml), freesyn(t), t = 0; | |
706 | ||
707 | if (haderr) { | |
708 | if (!catch) { | |
709 | /* unwind */ | |
710 | doneinp = 0; | |
711 | resexit(osetexit); | |
712 | reset(); | |
713 | } | |
714 | haderr = 0; | |
715 | /* | |
716 | * Every error is eventually caught here or | |
717 | * the shell dies. It is at this | |
718 | * point that we clean up any left-over open | |
719 | * files, by closing all but a fixed number | |
720 | * of pre-defined files. Thus routines don't | |
721 | * have to worry about leaving files open due | |
722 | * to deeper errors... they will get closed here. | |
723 | */ | |
724 | closem(); | |
725 | continue; | |
726 | } | |
727 | if (doneinp) { | |
728 | doneinp = 0; | |
729 | break; | |
730 | } | |
731 | if (chkstop) | |
732 | chkstop--; | |
733 | if (neednote) | |
734 | pnote(); | |
c9166193 | 735 | if (intty && prompt && evalvec == 0) { |
04d3b78c BJ |
736 | mailchk(); |
737 | /* | |
738 | * If we are at the end of the input buffer | |
739 | * then we are going to read fresh stuff. | |
740 | * Otherwise, we are rereading input and don't | |
741 | * need or want to prompt. | |
742 | */ | |
743 | if (fseekp == feobp) | |
544d4ed6 | 744 | printprompt(); |
04d3b78c BJ |
745 | } |
746 | err = 0; | |
747 | ||
748 | /* | |
749 | * Echo not only on VERBOSE, but also with history expansion. | |
750 | * If there is a lexical error then we forego history echo. | |
751 | */ | |
d7929fa7 KM |
752 | if (lex(¶ml) && !err && intty || |
753 | adrof("verbose")) { | |
04d3b78c BJ |
754 | haderr = 1; |
755 | prlex(¶ml); | |
756 | haderr = 0; | |
757 | } | |
758 | ||
759 | /* | |
760 | * The parser may lose space if interrupted. | |
761 | */ | |
762 | if (setintr) | |
35371dec | 763 | (void) sigblock(sigmask(SIGINT)); |
04d3b78c BJ |
764 | |
765 | /* | |
63af20f7 KM |
766 | * Save input text on the history list if |
767 | * reading in old history, or it | |
04d3b78c BJ |
768 | * is from the terminal at the top level and not |
769 | * in a loop. | |
770 | */ | |
63af20f7 | 771 | if (enterhist || catch && intty && !whyles) |
04d3b78c BJ |
772 | savehist(¶ml); |
773 | ||
774 | /* | |
d7929fa7 KM |
775 | * Print lexical error messages, except when sourcing |
776 | * history lists. | |
04d3b78c | 777 | */ |
d7929fa7 | 778 | if (!enterhist && err) |
04d3b78c BJ |
779 | error(err); |
780 | ||
781 | /* | |
782 | * If had a history command :p modifier then | |
783 | * this is as far as we should go | |
784 | */ | |
785 | if (justpr) | |
786 | reset(); | |
787 | ||
788 | alias(¶ml); | |
789 | ||
790 | /* | |
791 | * Parse the words of the input into a parse tree. | |
792 | */ | |
793 | t = syntax(paraml.next, ¶ml, 0); | |
794 | if (err) | |
795 | error(err); | |
796 | ||
797 | /* | |
798 | * Execute the parse tree | |
799 | */ | |
800 | execute(t, tpgrp); | |
801 | ||
802 | /* | |
803 | * Made it! | |
804 | */ | |
805 | freelex(¶ml), freesyn(t); | |
806 | } | |
807 | resexit(osetexit); | |
808 | } | |
809 | ||
810 | dosource(t) | |
811 | register char **t; | |
812 | { | |
813 | register char *f; | |
814 | register int u; | |
d7929fa7 KM |
815 | bool hflg = 0; |
816 | char buf[BUFSIZ]; | |
04d3b78c BJ |
817 | |
818 | t++; | |
d7929fa7 KM |
819 | if (*t && eq(*t, "-h")) { |
820 | t++; | |
821 | hflg++; | |
822 | } | |
35371dec | 823 | (void) strcpy(buf, *t); |
d7929fa7 | 824 | f = globone(buf); |
04d3b78c BJ |
825 | u = dmove(open(f, 0), -1); |
826 | xfree(f); | |
d7929fa7 | 827 | if (u < 0 && !hflg) |
04d3b78c | 828 | Perror(f); |
35371dec | 829 | (void) ioctl(u, FIOCLEX, (char *)0); |
d7929fa7 | 830 | srcunit(u, 0, hflg); |
04d3b78c BJ |
831 | } |
832 | ||
833 | /* | |
834 | * Check for mail. | |
835 | * If we are a login shell, then we don't want to tell | |
836 | * about any mail file unless its been modified | |
837 | * after the time we started. | |
838 | * This prevents us from telling the user things he already | |
839 | * knows, since the login program insists on saying | |
840 | * "You have mail." | |
841 | */ | |
842 | mailchk() | |
843 | { | |
844 | register struct varent *v; | |
845 | register char **vp; | |
846 | time_t t; | |
847 | int intvl, cnt; | |
848 | struct stat stb; | |
849 | bool new; | |
850 | ||
851 | v = adrof("mail"); | |
852 | if (v == 0) | |
853 | return; | |
35371dec | 854 | (void) time(&t); |
04d3b78c BJ |
855 | vp = v->vec; |
856 | cnt = blklen(vp); | |
857 | intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL; | |
858 | if (intvl < 1) | |
859 | intvl = 1; | |
860 | if (chktim + intvl > t) | |
861 | return; | |
862 | for (; *vp; vp++) { | |
863 | if (stat(*vp, &stb) < 0) | |
864 | continue; | |
ae3d9709 | 865 | new = stb.st_mtime > time0.tv_sec; |
04d3b78c BJ |
866 | if (stb.st_size == 0 || stb.st_atime > stb.st_mtime || |
867 | (stb.st_atime < chktim && stb.st_mtime < chktim) || | |
868 | loginsh && !new) | |
869 | continue; | |
870 | if (cnt == 1) | |
871 | printf("You have %smail.\n", new ? "new " : ""); | |
872 | else | |
873 | printf("%s in %s.\n", new ? "New mail" : "Mail", *vp); | |
874 | } | |
875 | chktim = t; | |
876 | } | |
877 | ||
878 | #include <pwd.h> | |
879 | /* | |
880 | * Extract a home directory from the password file | |
881 | * The argument points to a buffer where the name of the | |
882 | * user whose home directory is sought is currently. | |
883 | * We write the home directory of the user back there. | |
884 | */ | |
885 | gethdir(home) | |
886 | char *home; | |
887 | { | |
888 | register struct passwd *pp = getpwnam(home); | |
889 | ||
890 | if (pp == 0) | |
891 | return (1); | |
35371dec | 892 | (void) strcpy(home, pp->pw_dir); |
04d3b78c BJ |
893 | return (0); |
894 | } | |
895 | ||
896 | /* | |
897 | * Move the initial descriptors to their eventual | |
898 | * resting places, closin all other units. | |
899 | */ | |
900 | initdesc() | |
901 | { | |
902 | ||
04d3b78c | 903 | didfds = 0; /* 0, 1, 2 aren't set up */ |
35371dec EW |
904 | (void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, (char *)0); |
905 | (void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, (char *)0); | |
906 | (void) ioctl(SHDIAG = dcopy(2, FSHDIAG), FIOCLEX, (char *)0); | |
907 | (void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, (char *)0); | |
04d3b78c BJ |
908 | closem(); |
909 | } | |
910 | ||
e31125a2 SL |
911 | #ifdef PROF |
912 | done(i) | |
913 | #else | |
04d3b78c | 914 | exit(i) |
e31125a2 | 915 | #endif |
04d3b78c BJ |
916 | int i; |
917 | { | |
918 | ||
919 | untty(); | |
04d3b78c | 920 | _exit(i); |
04d3b78c | 921 | } |
19d39288 | 922 | |
544d4ed6 | 923 | printprompt() |
19d39288 | 924 | { |
544d4ed6 SL |
925 | register char *cp; |
926 | ||
e31125a2 | 927 | if (!whyles) { |
544d4ed6 SL |
928 | for (cp = value("prompt"); *cp; cp++) |
929 | if (*cp == HIST) | |
930 | printf("%d", eventno + 1); | |
931 | else { | |
932 | if (*cp == '\\' && cp[1] == HIST) | |
933 | cp++; | |
fad613b5 | 934 | cshputchar(*cp | QUOTE); |
544d4ed6 SL |
935 | } |
936 | } else | |
937 | /* | |
938 | * Prompt for forward reading loop | |
939 | * body content. | |
940 | */ | |
941 | printf("? "); | |
942 | flush(); | |
19d39288 | 943 | } |