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 |
6cd08520 | 8 | static char *sccsid = "@(#)csh.c 5.18 (Berkeley) %G%"; |
094e80ed | 9 | #endif |
04d3b78c BJ |
10 | |
11 | #include "sh.h" | |
12 | #include <sys/ioctl.h> | |
5fe577ad | 13 | #include <sys/file.h> |
c502712b | 14 | #include "pathnames.h" |
5fe577ad | 15 | |
04d3b78c BJ |
16 | /* |
17 | * C Shell | |
18 | * | |
19 | * Bill Joy, UC Berkeley, California, USA | |
20 | * October 1978, May 1980 | |
21 | * | |
22 | * Jim Kulp, IIASA, Laxenburg, Austria | |
23 | * April 1980 | |
24 | */ | |
25 | ||
53eb5063 | 26 | char *pathlist[] = { ".", _PATH_BIN, _PATH_USRBIN, 0 }; |
6ea8dfee | 27 | char *dumphist[] = { "history", "-h", 0, 0 }; |
d7929fa7 | 28 | char *loadhist[] = { "source", "-h", "~/.history", 0 }; |
04d3b78c BJ |
29 | char HIST = '!'; |
30 | char HISTSUB = '^'; | |
1274df0a | 31 | bool mflag; |
04d3b78c BJ |
32 | bool nofile; |
33 | bool reenter; | |
34 | bool nverbose; | |
35 | bool nexececho; | |
36 | bool quitit; | |
37 | bool fast; | |
f0bb61e3 | 38 | bool batch; |
04d3b78c | 39 | bool prompt = 1; |
63af20f7 | 40 | bool enterhist = 0; |
04d3b78c | 41 | |
00705acc JL |
42 | extern gid_t getegid(), getgid(); |
43 | extern uid_t geteuid(), getuid(); | |
44 | ||
d3ac50fc | 45 | void pintr(), pchild(), srcunit(); |
2400447c | 46 | |
7a24a2dc KB |
47 | main(argc, argv) |
48 | int argc; | |
49 | char **argv; | |
04d3b78c BJ |
50 | { |
51 | register char **v, *cp; | |
52 | register int f; | |
d33af40e | 53 | struct sigvec osv; |
04d3b78c BJ |
54 | |
55 | settimes(); /* Immed. estab. timing base */ | |
7a24a2dc | 56 | v = argv; |
04d3b78c BJ |
57 | if (eq(v[0], "a.out")) /* A.out's are quittable */ |
58 | quitit = 1; | |
59 | uid = getuid(); | |
7a24a2dc | 60 | loginsh = **v == '-' && argc == 1; |
04d3b78c | 61 | if (loginsh) |
35371dec | 62 | (void) time(&chktim); |
04d3b78c BJ |
63 | |
64 | /* | |
65 | * Move the descriptors to safe places. | |
66 | * The variable didfds is 0 while we have only FSH* to work with. | |
67 | * When didfds is true, we have 0,1,2 and prefer to use these. | |
68 | */ | |
69 | initdesc(); | |
70 | ||
71 | /* | |
72 | * Initialize the shell variables. | |
73 | * ARGV and PROMPT are initialized later. | |
74 | * STATUS is also munged in several places. | |
75 | * CHILD is munged when forking/waiting | |
76 | */ | |
77 | ||
78 | set("status", "0"); | |
79 | dinit(cp = getenv("HOME")); /* dinit thinks that HOME == cwd in a | |
80 | * login shell */ | |
81 | if (cp == NOSTR) | |
82 | fast++; /* No home -> can't read scripts */ | |
83 | else | |
84 | set("home", savestr(cp)); | |
85 | /* | |
86 | * Grab other useful things from the environment. | |
87 | * Should we grab everything?? | |
88 | */ | |
89 | if ((cp = getenv("USER")) != NOSTR) | |
90 | set("user", savestr(cp)); | |
91 | if ((cp = getenv("TERM")) != NOSTR) | |
92 | set("term", savestr(cp)); | |
93 | /* | |
94 | * Re-initialize path if set in environment | |
95 | */ | |
96 | if ((cp = getenv("PATH")) == NOSTR) | |
97 | set1("path", saveblk(pathlist), &shvhed); | |
35371dec EW |
98 | else |
99 | importpath(cp); | |
5fe577ad | 100 | set("shell", _PATH_CSHELL); |
04d3b78c BJ |
101 | |
102 | doldol = putn(getpid()); /* For $$ */ | |
103 | shtemp = strspl("/tmp/sh", doldol); /* For << */ | |
104 | ||
105 | /* | |
106 | * Record the interrupt states from the parent process. | |
107 | * If the parent is non-interruptible our hand must be forced | |
108 | * or we (and our children) won't be either. | |
109 | * Our children inherit termination from our parent. | |
110 | * We catch it only if we are the login shell. | |
111 | */ | |
35371dec EW |
112 | /* parents interruptibility */ |
113 | (void) sigvec(SIGINT, (struct sigvec *)0, &osv); | |
d33af40e | 114 | parintr = osv.sv_handler; |
35371dec EW |
115 | /* parents terminability */ |
116 | (void) sigvec(SIGTERM, (struct sigvec *)0, &osv); | |
d33af40e | 117 | parterm = osv.sv_handler; |
f66d6be5 | 118 | if (loginsh) { |
c5020dd9 KB |
119 | sig_t phup; |
120 | ||
35371dec EW |
121 | (void) signal(SIGHUP, phup); /* exit processing on HUP */ |
122 | (void) signal(SIGXCPU, phup); /* ...and on XCPU */ | |
123 | (void) signal(SIGXFSZ, phup); /* ...and on XFSZ */ | |
f66d6be5 | 124 | } |
04d3b78c BJ |
125 | |
126 | /* | |
127 | * Process the arguments. | |
128 | * | |
129 | * Note that processing of -v/-x is actually delayed till after | |
130 | * script processing. | |
04d3b78c | 131 | */ |
7a24a2dc KB |
132 | argc--, v++; |
133 | while (argc > 0 && (cp = v[0])[0] == '-' && *++cp != '\0' && !batch) { | |
04d3b78c BJ |
134 | do switch (*cp++) { |
135 | ||
f0bb61e3 RC |
136 | case 'b': /* -b Next arg is input file */ |
137 | batch++; | |
138 | break; | |
139 | ||
04d3b78c | 140 | case 'c': /* -c Command input from arg */ |
7a24a2dc | 141 | if (argc == 1) |
04d3b78c | 142 | exit(0); |
7a24a2dc | 143 | argc--, v++; |
04d3b78c BJ |
144 | arginp = v[0]; |
145 | prompt = 0; | |
146 | nofile++; | |
147 | break; | |
148 | ||
149 | case 'e': /* -e Exit on any error */ | |
150 | exiterr++; | |
151 | break; | |
152 | ||
153 | case 'f': /* -f Fast start */ | |
154 | fast++; | |
155 | break; | |
156 | ||
157 | case 'i': /* -i Interactive, even if !intty */ | |
158 | intact++; | |
159 | nofile++; | |
160 | break; | |
161 | ||
1274df0a KB |
162 | case 'm': /* -m read .cshrc (from su) */ |
163 | mflag++; | |
164 | break; | |
165 | ||
04d3b78c BJ |
166 | case 'n': /* -n Don't execute */ |
167 | noexec++; | |
168 | break; | |
169 | ||
170 | case 'q': /* -q (Undoc'd) ... die on quit */ | |
171 | quitit = 1; | |
172 | break; | |
173 | ||
174 | case 's': /* -s Read from std input */ | |
175 | nofile++; | |
176 | break; | |
177 | ||
178 | case 't': /* -t Read one line from input */ | |
179 | onelflg = 2; | |
180 | prompt = 0; | |
181 | nofile++; | |
182 | break; | |
183 | ||
184 | case 'v': /* -v Echo hist expanded input */ | |
185 | nverbose = 1; /* ... later */ | |
186 | break; | |
187 | ||
188 | case 'x': /* -x Echo just before execution */ | |
189 | nexececho = 1; /* ... later */ | |
190 | break; | |
191 | ||
192 | case 'V': /* -V Echo hist expanded input */ | |
193 | setNS("verbose"); /* NOW! */ | |
194 | break; | |
195 | ||
196 | case 'X': /* -X Echo just before execution */ | |
197 | setNS("echo"); /* NOW! */ | |
198 | break; | |
199 | ||
200 | } while (*cp); | |
7a24a2dc | 201 | v++, argc--; |
04d3b78c BJ |
202 | } |
203 | ||
204 | if (quitit) /* With all due haste, for debugging */ | |
35371dec | 205 | (void) signal(SIGQUIT, SIG_DFL); |
04d3b78c BJ |
206 | |
207 | /* | |
f0bb61e3 | 208 | * Unless prevented by -c, -i, -s, or -t, if there |
04d3b78c BJ |
209 | * are remaining arguments the first of them is the name |
210 | * of a shell file from which to read commands. | |
211 | */ | |
7a24a2dc | 212 | if (nofile == 0 && argc > 0) { |
04d3b78c BJ |
213 | nofile = open(v[0], 0); |
214 | if (nofile < 0) { | |
215 | child++; /* So this ... */ | |
216 | Perror(v[0]); /* ... doesn't return */ | |
217 | } | |
218 | file = v[0]; | |
219 | SHIN = dmove(nofile, FSHIN); /* Replace FSHIN */ | |
35371dec | 220 | (void) ioctl(SHIN, FIOCLEX, (char *)0); |
04d3b78c | 221 | prompt = 0; |
7a24a2dc | 222 | argc--, v++; |
04d3b78c | 223 | } |
dee2e6bb | 224 | if (!batch && (uid != geteuid() || getgid() != getegid())) { |
f0bb61e3 RC |
225 | errno = EACCES; |
226 | child++; /* So this ... */ | |
227 | Perror("csh"); /* ... doesn't return */ | |
228 | } | |
04d3b78c BJ |
229 | /* |
230 | * Consider input a tty if it really is or we are interactive. | |
231 | */ | |
232 | intty = intact || isatty(SHIN); | |
233 | /* | |
234 | * Decide whether we should play with signals or not. | |
235 | * If we are explicitly told (via -i, or -) or we are a login | |
236 | * shell (arg0 starts with -) or the input and output are both | |
237 | * the ttys("csh", or "csh</dev/ttyx>/dev/ttyx") | |
238 | * Note that in only the login shell is it likely that parent | |
239 | * may have set signals to be ignored | |
240 | */ | |
3b1a0a1e | 241 | if (loginsh || intact || intty && isatty(SHOUT)) |
04d3b78c BJ |
242 | setintr = 1; |
243 | #ifdef TELL | |
244 | settell(); | |
245 | #endif | |
246 | /* | |
247 | * Save the remaining arguments in argv. | |
248 | */ | |
249 | setq("argv", v, &shvhed); | |
250 | ||
251 | /* | |
252 | * Set up the prompt. | |
253 | */ | |
254 | if (prompt) | |
255 | set("prompt", uid == 0 ? "# " : "% "); | |
256 | ||
257 | /* | |
258 | * If we are an interactive shell, then start fiddling | |
259 | * with the signals; this is a tricky game. | |
260 | */ | |
261 | shpgrp = getpgrp(0); | |
262 | opgrp = tpgrp = -1; | |
04d3b78c | 263 | if (setintr) { |
7a24a2dc | 264 | **argv = '-'; |
04d3b78c | 265 | if (!quitit) /* Wary! */ |
35371dec EW |
266 | (void) signal(SIGQUIT, SIG_IGN); |
267 | (void) signal(SIGINT, pintr); | |
268 | (void) sigblock(sigmask(SIGINT)); | |
269 | (void) signal(SIGTERM, SIG_IGN); | |
04d3b78c | 270 | if (quitit == 0 && arginp == 0) { |
35371dec EW |
271 | (void) signal(SIGTSTP, SIG_IGN); |
272 | (void) signal(SIGTTIN, SIG_IGN); | |
273 | (void) signal(SIGTTOU, SIG_IGN); | |
04d3b78c BJ |
274 | /* |
275 | * Wait till in foreground, in case someone | |
276 | * stupidly runs | |
277 | * csh & | |
278 | * dont want to try to grab away the tty. | |
279 | */ | |
280 | if (isatty(FSHDIAG)) | |
281 | f = FSHDIAG; | |
282 | else if (isatty(FSHOUT)) | |
283 | f = FSHOUT; | |
284 | else if (isatty(OLDSTD)) | |
285 | f = OLDSTD; | |
286 | else | |
287 | f = -1; | |
288 | retry: | |
35371dec EW |
289 | if (ioctl(f, TIOCGPGRP, (char *)&tpgrp) == 0 && |
290 | tpgrp != -1) { | |
04d3b78c BJ |
291 | int ldisc; |
292 | if (tpgrp != shpgrp) { | |
c5020dd9 | 293 | sig_t old = signal(SIGTTIN, SIG_DFL); |
35371dec EW |
294 | (void) kill(0, SIGTTIN); |
295 | (void) signal(SIGTTIN, old); | |
04d3b78c BJ |
296 | goto retry; |
297 | } | |
04d3b78c BJ |
298 | opgrp = shpgrp; |
299 | shpgrp = getpid(); | |
300 | tpgrp = shpgrp; | |
35371dec | 301 | (void) setpgrp(0, shpgrp); |
ff1a97a1 | 302 | (void) ioctl(f, TIOCSPGRP, (char *)&shpgrp); |
35371dec EW |
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++; | |
5fe577ad KB |
324 | { |
325 | int osetintr, omask; | |
326 | osetintr = setintr; | |
327 | omask = sigblock(sigmask(SIGINT)); | |
328 | setintr = 0; | |
329 | srcunit(open(_PATH_DOTCSHRC, O_RDONLY), 0, 0); | |
330 | if (!fast && !arginp && !onelflg) | |
331 | dohash(); | |
332 | if (loginsh) | |
333 | srcunit(open(_PATH_DOTLOGIN, O_RDONLY), 0, 0); | |
334 | (void)sigsetmask(omask); | |
335 | setintr = osetintr; | |
336 | } | |
04d3b78c BJ |
337 | /* Will have value("home") here because set fast if don't */ |
338 | srccat(value("home"), "/.cshrc"); | |
35371dec | 339 | if (!fast && !arginp && !onelflg && !havhash) |
04d3b78c BJ |
340 | dohash(); |
341 | if (loginsh) { | |
04d3b78c BJ |
342 | srccat(value("home"), "/.login"); |
343 | } | |
5eaf2044 | 344 | dosource(loadhist); |
04d3b78c BJ |
345 | } |
346 | ||
347 | /* | |
348 | * Now are ready for the -v and -x flags | |
349 | */ | |
350 | if (nverbose) | |
351 | setNS("verbose"); | |
352 | if (nexececho) | |
353 | setNS("echo"); | |
354 | ||
355 | /* | |
356 | * All the rest of the world is inside this call. | |
357 | * The argument to process indicates whether it should | |
358 | * catch "error unwinds". Thus if we are a interactive shell | |
359 | * our call here will never return by being blown past on an error. | |
360 | */ | |
361 | process(setintr); | |
362 | ||
363 | /* | |
364 | * Mop-up. | |
365 | */ | |
366 | if (loginsh) { | |
367 | printf("logout\n"); | |
35371dec | 368 | (void) close(SHIN); |
04d3b78c BJ |
369 | child++; |
370 | goodbye(); | |
371 | } | |
d7929fa7 | 372 | rechist(); |
04d3b78c BJ |
373 | exitstat(); |
374 | } | |
375 | ||
376 | untty() | |
377 | { | |
378 | ||
379 | if (tpgrp > 0) { | |
35371dec EW |
380 | (void) setpgrp(0, opgrp); |
381 | (void) ioctl(FSHTTY, TIOCSPGRP, (char *)&opgrp); | |
04d3b78c BJ |
382 | } |
383 | } | |
384 | ||
385 | importpath(cp) | |
ec1a81af | 386 | char *cp; |
04d3b78c BJ |
387 | { |
388 | register int i = 0; | |
389 | register char *dp; | |
390 | register char **pv; | |
391 | int c; | |
392 | static char dot[2] = {'.', 0}; | |
393 | ||
394 | for (dp = cp; *dp; dp++) | |
395 | if (*dp == ':') | |
396 | i++; | |
397 | /* | |
398 | * i+2 where i is the number of colons in the path. | |
399 | * There are i+1 directories in the path plus we need | |
400 | * room for a zero terminator. | |
401 | */ | |
35371dec | 402 | pv = (char **) calloc((unsigned) (i + 2), sizeof (char **)); |
04d3b78c BJ |
403 | dp = cp; |
404 | i = 0; | |
405 | if (*dp) | |
406 | for (;;) { | |
407 | if ((c = *dp) == ':' || c == 0) { | |
408 | *dp = 0; | |
409 | pv[i++] = savestr(*cp ? cp : dot); | |
410 | if (c) { | |
411 | cp = dp + 1; | |
412 | *dp = ':'; | |
413 | } else | |
414 | break; | |
415 | } | |
416 | dp++; | |
417 | } | |
418 | pv[i] = 0; | |
419 | set1("path", pv, &shvhed); | |
420 | } | |
421 | ||
422 | /* | |
423 | * Source to the file which is the catenation of the argument names. | |
424 | */ | |
425 | srccat(cp, dp) | |
426 | char *cp, *dp; | |
427 | { | |
428 | register char *ep = strspl(cp, dp); | |
429 | register int unit = dmove(open(ep, 0), -1); | |
430 | ||
35371dec | 431 | (void) ioctl(unit, FIOCLEX, (char *)0); |
04d3b78c | 432 | xfree(ep); |
1274df0a | 433 | srcunit(unit, mflag ? 0 : 1, 0); |
04d3b78c BJ |
434 | } |
435 | ||
436 | /* | |
1274df0a KB |
437 | * Source to a unit. |
438 | * This occurs on ".cshrc"s and the like. | |
04d3b78c | 439 | */ |
470cb5e7 | 440 | int insource; |
2400447c | 441 | static void |
d7929fa7 | 442 | srcunit(unit, onlyown, hflg) |
04d3b78c | 443 | register int unit; |
1274df0a | 444 | bool onlyown, hflg; |
04d3b78c BJ |
445 | { |
446 | /* We have to push down a lot of state here */ | |
447 | /* All this could go into a structure */ | |
448 | int oSHIN = -1, oldintty = intty; | |
449 | struct whyle *oldwhyl = whyles; | |
450 | char *ogointr = gointr, *oarginp = arginp; | |
451 | char *oevalp = evalp, **oevalvec = evalvec; | |
452 | int oonelflg = onelflg; | |
d7929fa7 KM |
453 | bool oenterhist = enterhist; |
454 | char OHIST = HIST; | |
04d3b78c BJ |
455 | #ifdef TELL |
456 | bool otell = cantell; | |
457 | #endif | |
458 | struct Bin saveB; | |
459 | ||
460 | /* The (few) real local variables */ | |
461 | jmp_buf oldexit; | |
1f7b623f KB |
462 | int reenter; |
463 | long 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())) { | |
35371dec | 474 | (void) close(unit); |
04d3b78c BJ |
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 | */ | |
470cb5e7 | 490 | insource = 1; |
04d3b78c BJ |
491 | getexit(oldexit); |
492 | reenter = 0; | |
493 | if (setintr) | |
d33af40e | 494 | omask = sigblock(sigmask(SIGINT)); |
04d3b78c BJ |
495 | setexit(); |
496 | reenter++; | |
497 | if (reenter == 1) { | |
498 | /* Setup the new values of the state stuff saved above */ | |
6cd08520 | 499 | bcopy((char *)&B, (char *)&saveB, sizeof saveB); |
04d3b78c BJ |
500 | fbuf = (char **) 0; |
501 | fseekp = feobp = fblocks = 0; | |
502 | oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0; | |
503 | intty = isatty(SHIN), whyles = 0, gointr = 0; | |
504 | evalvec = 0; evalp = 0; | |
d7929fa7 KM |
505 | enterhist = hflg; |
506 | if (enterhist) | |
507 | HIST = '\0'; | |
04d3b78c BJ |
508 | /* |
509 | * Now if we are allowing commands to be interrupted, | |
510 | * we let ourselves be interrupted. | |
511 | */ | |
512 | if (setintr) | |
35371dec | 513 | (void) sigsetmask(omask); |
04d3b78c BJ |
514 | #ifdef TELL |
515 | settell(); | |
516 | #endif | |
517 | process(0); /* 0 -> blow away on errors */ | |
518 | } | |
519 | if (setintr) | |
35371dec | 520 | (void) sigsetmask(omask); |
04d3b78c BJ |
521 | if (oSHIN >= 0) { |
522 | register int i; | |
523 | ||
524 | /* We made it to the new state... free up its storage */ | |
525 | /* This code could get run twice but xfree doesn't care */ | |
526 | for (i = 0; i < fblocks; i++) | |
527 | xfree(fbuf[i]); | |
528 | xfree((char *)fbuf); | |
529 | ||
530 | /* Reset input arena */ | |
6cd08520 | 531 | bcopy((char *)&saveB, (char *)&B, sizeof B); |
04d3b78c | 532 | |
35371dec | 533 | (void) close(SHIN), SHIN = oSHIN; |
04d3b78c BJ |
534 | arginp = oarginp, onelflg = oonelflg; |
535 | evalp = oevalp, evalvec = oevalvec; | |
536 | intty = oldintty, whyles = oldwhyl, gointr = ogointr; | |
020d9a25 KM |
537 | if (enterhist) |
538 | HIST = OHIST; | |
d7929fa7 | 539 | enterhist = oenterhist; |
04d3b78c BJ |
540 | #ifdef TELL |
541 | cantell = otell; | |
542 | #endif | |
543 | } | |
544 | ||
545 | resexit(oldexit); | |
546 | /* | |
547 | * If process reset() (effectively an unwind) then | |
548 | * we must also unwind. | |
549 | */ | |
550 | if (reenter >= 2) | |
551 | error(NOSTR); | |
470cb5e7 | 552 | insource = 0; |
04d3b78c BJ |
553 | } |
554 | ||
d7929fa7 | 555 | rechist() |
04d3b78c | 556 | { |
63af20f7 KM |
557 | char buf[BUFSIZ]; |
558 | int fp, ftmp, oldidfds; | |
04d3b78c | 559 | |
d7929fa7 | 560 | if (!fast) { |
6ea8dfee KM |
561 | if (value("savehist")[0] == '\0') |
562 | return; | |
35371dec EW |
563 | (void) strcpy(buf, value("home")); |
564 | (void) strcat(buf, "/.history"); | |
14f52162 | 565 | fp = creat(buf, 0666); |
6ea8dfee KM |
566 | if (fp == -1) |
567 | return; | |
568 | oldidfds = didfds; | |
569 | didfds = 0; | |
570 | ftmp = SHOUT; | |
571 | SHOUT = fp; | |
35371dec | 572 | (void) strcpy(buf, value("savehist")); |
6ea8dfee KM |
573 | dumphist[2] = buf; |
574 | dohist(dumphist); | |
35371dec | 575 | (void) close(fp); |
6ea8dfee KM |
576 | SHOUT = ftmp; |
577 | didfds = oldidfds; | |
d7929fa7 KM |
578 | } |
579 | } | |
580 | ||
581 | goodbye() | |
582 | { | |
583 | if (loginsh) { | |
35371dec EW |
584 | (void) signal(SIGQUIT, SIG_IGN); |
585 | (void) signal(SIGINT, SIG_IGN); | |
586 | (void) signal(SIGTERM, SIG_IGN); | |
04d3b78c | 587 | setintr = 0; /* No interrupts after "logout" */ |
5fe577ad | 588 | srcunit(open(_PATH_DOTLOGOUT, O_RDONLY), 0, 0); |
04d3b78c BJ |
589 | if (adrof("home")) |
590 | srccat(value("home"), "/.logout"); | |
591 | } | |
d7929fa7 | 592 | rechist(); |
04d3b78c BJ |
593 | exitstat(); |
594 | } | |
595 | ||
596 | exitstat() | |
597 | { | |
598 | ||
35371dec EW |
599 | #ifdef PROF |
600 | monitor(0); | |
601 | #endif | |
04d3b78c BJ |
602 | /* |
603 | * Note that if STATUS is corrupted (i.e. getn bombs) | |
604 | * then error will exit directly because we poke child here. | |
605 | * Otherwise we might continue unwarrantedly (sic). | |
606 | */ | |
607 | child++; | |
608 | exit(getn(value("status"))); | |
609 | } | |
610 | ||
d7929fa7 KM |
611 | /* |
612 | * in the event of a HUP we want to save the history | |
613 | */ | |
614 | phup() | |
615 | { | |
616 | rechist(); | |
617 | exit(1); | |
618 | } | |
619 | ||
04d3b78c BJ |
620 | char *jobargv[2] = { "jobs", 0 }; |
621 | /* | |
622 | * Catch an interrupt, e.g. during lexical input. | |
623 | * If we are an interactive shell, we reset the interrupt catch | |
624 | * immediately. In any case we drain the shell output, | |
625 | * and finally go through the normal error mechanism, which | |
626 | * gets a chance to make the shell go away. | |
627 | */ | |
d3ac50fc | 628 | void |
04d3b78c | 629 | pintr() |
401149be BJ |
630 | { |
631 | pintr1(1); | |
632 | } | |
633 | ||
634 | pintr1(wantnl) | |
635 | bool wantnl; | |
04d3b78c BJ |
636 | { |
637 | register char **v; | |
1f7b623f | 638 | long omask; |
04d3b78c | 639 | |
1f7b623f | 640 | omask = sigblock(0L); |
04d3b78c | 641 | if (setintr) { |
35371dec | 642 | (void) sigsetmask(omask & ~sigmask(SIGINT)); |
04d3b78c BJ |
643 | if (pjobs) { |
644 | pjobs = 0; | |
645 | printf("\n"); | |
646 | dojobs(jobargv); | |
647 | bferr("Interrupted"); | |
648 | } | |
649 | } | |
35371dec | 650 | (void) sigsetmask(omask & ~sigmask(SIGCHLD)); |
04d3b78c BJ |
651 | draino(); |
652 | ||
653 | /* | |
654 | * If we have an active "onintr" then we search for the label. | |
655 | * Note that if one does "onintr -" then we shan't be interruptible | |
656 | * so we needn't worry about that here. | |
657 | */ | |
658 | if (gointr) { | |
659 | search(ZGOTO, 0, gointr); | |
660 | timflg = 0; | |
661 | if (v = pargv) | |
662 | pargv = 0, blkfree(v); | |
663 | if (v = gargv) | |
664 | gargv = 0, blkfree(v); | |
665 | reset(); | |
401149be | 666 | } else if (intty && wantnl) |
04d3b78c BJ |
667 | printf("\n"); /* Some like this, others don't */ |
668 | error(NOSTR); | |
669 | } | |
670 | ||
671 | /* | |
672 | * Process is the main driving routine for the shell. | |
673 | * It runs all command processing, except for those within { ... } | |
674 | * in expressions (which is run by a routine evalav in sh.exp.c which | |
675 | * is a stripped down process), and `...` evaluation which is run | |
676 | * also by a subset of this code in sh.glob.c in the routine backeval. | |
677 | * | |
678 | * The code here is a little strange because part of it is interruptible | |
679 | * and hence freeing of structures appears to occur when none is necessary | |
680 | * if this is ignored. | |
681 | * | |
682 | * Note that if catch is not set then we will unwind on any error. | |
683 | * If an end-of-file occurs, we return. | |
684 | */ | |
685 | process(catch) | |
686 | bool catch; | |
687 | { | |
04d3b78c | 688 | jmp_buf osetexit; |
35371dec | 689 | register struct command *t; |
04d3b78c BJ |
690 | |
691 | getexit(osetexit); | |
692 | for (;;) { | |
693 | pendjob(); | |
694 | paraml.next = paraml.prev = ¶ml; | |
695 | paraml.word = ""; | |
696 | t = 0; | |
697 | setexit(); | |
63af20f7 | 698 | justpr = enterhist; /* execute if not entering history */ |
04d3b78c BJ |
699 | |
700 | /* | |
701 | * Interruptible during interactive reads | |
702 | */ | |
703 | if (setintr) | |
1f7b623f | 704 | (void) sigsetmask(sigblock(0L) & ~sigmask(SIGINT)); |
04d3b78c BJ |
705 | |
706 | /* | |
707 | * For the sake of reset() | |
708 | */ | |
709 | freelex(¶ml), freesyn(t), t = 0; | |
710 | ||
711 | if (haderr) { | |
712 | if (!catch) { | |
713 | /* unwind */ | |
714 | doneinp = 0; | |
715 | resexit(osetexit); | |
716 | reset(); | |
717 | } | |
718 | haderr = 0; | |
719 | /* | |
720 | * Every error is eventually caught here or | |
721 | * the shell dies. It is at this | |
722 | * point that we clean up any left-over open | |
723 | * files, by closing all but a fixed number | |
724 | * of pre-defined files. Thus routines don't | |
725 | * have to worry about leaving files open due | |
726 | * to deeper errors... they will get closed here. | |
727 | */ | |
728 | closem(); | |
729 | continue; | |
730 | } | |
731 | if (doneinp) { | |
732 | doneinp = 0; | |
733 | break; | |
734 | } | |
735 | if (chkstop) | |
736 | chkstop--; | |
737 | if (neednote) | |
738 | pnote(); | |
c9166193 | 739 | if (intty && prompt && evalvec == 0) { |
04d3b78c BJ |
740 | mailchk(); |
741 | /* | |
742 | * If we are at the end of the input buffer | |
743 | * then we are going to read fresh stuff. | |
744 | * Otherwise, we are rereading input and don't | |
745 | * need or want to prompt. | |
746 | */ | |
747 | if (fseekp == feobp) | |
544d4ed6 | 748 | printprompt(); |
04d3b78c BJ |
749 | } |
750 | err = 0; | |
751 | ||
752 | /* | |
753 | * Echo not only on VERBOSE, but also with history expansion. | |
754 | * If there is a lexical error then we forego history echo. | |
755 | */ | |
d7929fa7 KM |
756 | if (lex(¶ml) && !err && intty || |
757 | adrof("verbose")) { | |
04d3b78c BJ |
758 | haderr = 1; |
759 | prlex(¶ml); | |
760 | haderr = 0; | |
761 | } | |
762 | ||
763 | /* | |
764 | * The parser may lose space if interrupted. | |
765 | */ | |
766 | if (setintr) | |
35371dec | 767 | (void) sigblock(sigmask(SIGINT)); |
04d3b78c BJ |
768 | |
769 | /* | |
63af20f7 KM |
770 | * Save input text on the history list if |
771 | * reading in old history, or it | |
04d3b78c BJ |
772 | * is from the terminal at the top level and not |
773 | * in a loop. | |
774 | */ | |
63af20f7 | 775 | if (enterhist || catch && intty && !whyles) |
04d3b78c BJ |
776 | savehist(¶ml); |
777 | ||
778 | /* | |
d7929fa7 KM |
779 | * Print lexical error messages, except when sourcing |
780 | * history lists. | |
04d3b78c | 781 | */ |
d7929fa7 | 782 | if (!enterhist && err) |
04d3b78c BJ |
783 | error(err); |
784 | ||
785 | /* | |
786 | * If had a history command :p modifier then | |
787 | * this is as far as we should go | |
788 | */ | |
789 | if (justpr) | |
790 | reset(); | |
791 | ||
792 | alias(¶ml); | |
793 | ||
794 | /* | |
795 | * Parse the words of the input into a parse tree. | |
796 | */ | |
797 | t = syntax(paraml.next, ¶ml, 0); | |
798 | if (err) | |
799 | error(err); | |
800 | ||
801 | /* | |
802 | * Execute the parse tree | |
803 | */ | |
804 | execute(t, tpgrp); | |
805 | ||
806 | /* | |
807 | * Made it! | |
808 | */ | |
809 | freelex(¶ml), freesyn(t); | |
810 | } | |
811 | resexit(osetexit); | |
812 | } | |
813 | ||
814 | dosource(t) | |
815 | register char **t; | |
816 | { | |
817 | register char *f; | |
818 | register int u; | |
d7929fa7 KM |
819 | bool hflg = 0; |
820 | char buf[BUFSIZ]; | |
04d3b78c BJ |
821 | |
822 | t++; | |
d7929fa7 KM |
823 | if (*t && eq(*t, "-h")) { |
824 | t++; | |
825 | hflg++; | |
826 | } | |
35371dec | 827 | (void) strcpy(buf, *t); |
d7929fa7 | 828 | f = globone(buf); |
04d3b78c BJ |
829 | u = dmove(open(f, 0), -1); |
830 | xfree(f); | |
d7929fa7 | 831 | if (u < 0 && !hflg) |
04d3b78c | 832 | Perror(f); |
35371dec | 833 | (void) ioctl(u, FIOCLEX, (char *)0); |
d7929fa7 | 834 | srcunit(u, 0, hflg); |
04d3b78c BJ |
835 | } |
836 | ||
837 | /* | |
838 | * Check for mail. | |
839 | * If we are a login shell, then we don't want to tell | |
840 | * about any mail file unless its been modified | |
841 | * after the time we started. | |
842 | * This prevents us from telling the user things he already | |
843 | * knows, since the login program insists on saying | |
844 | * "You have mail." | |
845 | */ | |
846 | mailchk() | |
847 | { | |
848 | register struct varent *v; | |
849 | register char **vp; | |
850 | time_t t; | |
851 | int intvl, cnt; | |
852 | struct stat stb; | |
853 | bool new; | |
854 | ||
855 | v = adrof("mail"); | |
856 | if (v == 0) | |
857 | return; | |
35371dec | 858 | (void) time(&t); |
04d3b78c BJ |
859 | vp = v->vec; |
860 | cnt = blklen(vp); | |
861 | intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL; | |
862 | if (intvl < 1) | |
863 | intvl = 1; | |
864 | if (chktim + intvl > t) | |
865 | return; | |
866 | for (; *vp; vp++) { | |
867 | if (stat(*vp, &stb) < 0) | |
868 | continue; | |
ae3d9709 | 869 | new = stb.st_mtime > time0.tv_sec; |
04d3b78c BJ |
870 | if (stb.st_size == 0 || stb.st_atime > stb.st_mtime || |
871 | (stb.st_atime < chktim && stb.st_mtime < chktim) || | |
872 | loginsh && !new) | |
873 | continue; | |
874 | if (cnt == 1) | |
875 | printf("You have %smail.\n", new ? "new " : ""); | |
876 | else | |
877 | printf("%s in %s.\n", new ? "New mail" : "Mail", *vp); | |
878 | } | |
879 | chktim = t; | |
880 | } | |
881 | ||
882 | #include <pwd.h> | |
883 | /* | |
884 | * Extract a home directory from the password file | |
885 | * The argument points to a buffer where the name of the | |
886 | * user whose home directory is sought is currently. | |
887 | * We write the home directory of the user back there. | |
888 | */ | |
889 | gethdir(home) | |
890 | char *home; | |
891 | { | |
892 | register struct passwd *pp = getpwnam(home); | |
893 | ||
894 | if (pp == 0) | |
895 | return (1); | |
35371dec | 896 | (void) strcpy(home, pp->pw_dir); |
04d3b78c BJ |
897 | return (0); |
898 | } | |
899 | ||
900 | /* | |
901 | * Move the initial descriptors to their eventual | |
902 | * resting places, closin all other units. | |
903 | */ | |
904 | initdesc() | |
905 | { | |
906 | ||
04d3b78c | 907 | didfds = 0; /* 0, 1, 2 aren't set up */ |
35371dec EW |
908 | (void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, (char *)0); |
909 | (void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, (char *)0); | |
910 | (void) ioctl(SHDIAG = dcopy(2, FSHDIAG), FIOCLEX, (char *)0); | |
911 | (void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, (char *)0); | |
04d3b78c BJ |
912 | closem(); |
913 | } | |
914 | ||
e31125a2 SL |
915 | #ifdef PROF |
916 | done(i) | |
917 | #else | |
04d3b78c | 918 | exit(i) |
e31125a2 | 919 | #endif |
04d3b78c BJ |
920 | int i; |
921 | { | |
922 | ||
923 | untty(); | |
04d3b78c | 924 | _exit(i); |
04d3b78c | 925 | } |
19d39288 | 926 | |
544d4ed6 | 927 | printprompt() |
19d39288 | 928 | { |
544d4ed6 SL |
929 | register char *cp; |
930 | ||
e31125a2 | 931 | if (!whyles) { |
544d4ed6 SL |
932 | for (cp = value("prompt"); *cp; cp++) |
933 | if (*cp == HIST) | |
934 | printf("%d", eventno + 1); | |
935 | else { | |
936 | if (*cp == '\\' && cp[1] == HIST) | |
937 | cp++; | |
fad613b5 | 938 | cshputchar(*cp | QUOTE); |
544d4ed6 SL |
939 | } |
940 | } else | |
941 | /* | |
942 | * Prompt for forward reading loop | |
943 | * body content. | |
944 | */ | |
945 | printf("? "); | |
946 | flush(); | |
19d39288 | 947 | } |