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d4d2fb62 | 1 | /*- |
d1b73048 KB |
2 | * Copyright (c) 1991, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
d4d2fb62 KB |
4 | * |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Kenneth Almquist. | |
7 | * | |
af49c367 | 8 | * %sccs.include.redist.c% |
d4d2fb62 KB |
9 | */ |
10 | ||
11 | #ifndef lint | |
13b3e634 | 12 | static char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) %G%"; |
d4d2fb62 KB |
13 | #endif /* not lint */ |
14 | ||
13b3e634 CZ |
15 | #include <fcntl.h> |
16 | #include <signal.h> | |
17 | #include <errno.h> | |
18 | #include <unistd.h> | |
19 | #include <stdlib.h> | |
20 | #include <sys/types.h> | |
21 | #include <sys/param.h> | |
22 | #ifdef BSD | |
23 | #include <sys/wait.h> | |
24 | #include <sys/time.h> | |
25 | #include <sys/resource.h> | |
26 | #endif | |
27 | ||
d4d2fb62 KB |
28 | #include "shell.h" |
29 | #if JOBS | |
30 | #include "sgtty.h" | |
31 | #undef CEOF /* syntax.h redefines this */ | |
32 | #endif | |
13b3e634 CZ |
33 | #include "redir.h" |
34 | #include "show.h" | |
d4d2fb62 KB |
35 | #include "main.h" |
36 | #include "parser.h" | |
37 | #include "nodes.h" | |
38 | #include "jobs.h" | |
39 | #include "options.h" | |
40 | #include "trap.h" | |
d4d2fb62 KB |
41 | #include "syntax.h" |
42 | #include "input.h" | |
43 | #include "output.h" | |
44 | #include "memalloc.h" | |
45 | #include "error.h" | |
46 | #include "mystring.h" | |
d4d2fb62 KB |
47 | |
48 | ||
49 | struct job *jobtab; /* array of jobs */ | |
50 | int njobs; /* size of array */ | |
51 | MKINIT short backgndpid = -1; /* pid of last background process */ | |
52 | #if JOBS | |
53 | int initialpgrp; /* pgrp of shell on invocation */ | |
54 | short curjob; /* current job */ | |
55 | #endif | |
56 | ||
13b3e634 CZ |
57 | STATIC void restartjob __P((struct job *)); |
58 | STATIC void freejob __P((struct job *)); | |
59 | STATIC struct job *getjob __P((char *)); | |
60 | STATIC int dowait __P((int, struct job *)); | |
61 | STATIC int onsigchild __P((void)); | |
62 | STATIC int waitproc __P((int, int *)); | |
63 | STATIC void cmdtxt __P((union node *)); | |
64 | STATIC void cmdputs __P((char *)); | |
d4d2fb62 | 65 | |
79b6cd19 | 66 | |
d4d2fb62 KB |
67 | /* |
68 | * Turn job control on and off. | |
69 | * | |
70 | * Note: This code assumes that the third arg to ioctl is a character | |
71 | * pointer, which is true on Berkeley systems but not System V. Since | |
72 | * System V doesn't have job control yet, this isn't a problem now. | |
73 | */ | |
74 | ||
75 | MKINIT int jobctl; | |
76 | ||
77 | void | |
13b3e634 CZ |
78 | setjobctl(on) |
79 | int on; | |
80 | { | |
8979b8b4 | 81 | #ifdef OLD_TTY_DRIVER |
d4d2fb62 | 82 | int ldisc; |
8979b8b4 | 83 | #endif |
d4d2fb62 KB |
84 | |
85 | if (on == jobctl || rootshell == 0) | |
86 | return; | |
87 | if (on) { | |
88 | do { /* while we are in the background */ | |
89 | if (ioctl(2, TIOCGPGRP, (char *)&initialpgrp) < 0) { | |
057eb6b7 MT |
90 | out2str("sh: can't access tty; job control turned off\n"); |
91 | mflag = 0; | |
d4d2fb62 KB |
92 | return; |
93 | } | |
94 | if (initialpgrp == -1) | |
af49c367 KB |
95 | initialpgrp = getpgrp(); |
96 | else if (initialpgrp != getpgrp()) { | |
d4d2fb62 KB |
97 | killpg(initialpgrp, SIGTTIN); |
98 | continue; | |
99 | } | |
100 | } while (0); | |
057eb6b7 | 101 | #ifdef OLD_TTY_DRIVER |
d4d2fb62 | 102 | if (ioctl(2, TIOCGETD, (char *)&ldisc) < 0 || ldisc != NTTYDISC) { |
057eb6b7 MT |
103 | out2str("sh: need new tty driver to run job control; job control turned off\n"); |
104 | mflag = 0; | |
d4d2fb62 KB |
105 | return; |
106 | } | |
057eb6b7 | 107 | #endif |
d4d2fb62 KB |
108 | setsignal(SIGTSTP); |
109 | setsignal(SIGTTOU); | |
f97844eb | 110 | setsignal(SIGTTIN); |
543f5e91 | 111 | setpgid(0, rootpid); |
d4d2fb62 KB |
112 | ioctl(2, TIOCSPGRP, (char *)&rootpid); |
113 | } else { /* turning job control off */ | |
543f5e91 | 114 | setpgid(0, initialpgrp); |
d4d2fb62 KB |
115 | ioctl(2, TIOCSPGRP, (char *)&initialpgrp); |
116 | setsignal(SIGTSTP); | |
117 | setsignal(SIGTTOU); | |
f97844eb | 118 | setsignal(SIGTTIN); |
d4d2fb62 KB |
119 | } |
120 | jobctl = on; | |
121 | } | |
d4d2fb62 KB |
122 | |
123 | ||
124 | #ifdef mkinit | |
13b3e634 | 125 | INCLUDE <stdlib.h> |
d4d2fb62 KB |
126 | |
127 | SHELLPROC { | |
128 | backgndpid = -1; | |
129 | #if JOBS | |
130 | jobctl = 0; | |
131 | #endif | |
132 | } | |
133 | ||
134 | #endif | |
135 | ||
136 | ||
137 | ||
138 | #if JOBS | |
13b3e634 CZ |
139 | int |
140 | fgcmd(argc, argv) | |
141 | int argc; | |
142 | char **argv; | |
143 | { | |
d4d2fb62 KB |
144 | struct job *jp; |
145 | int pgrp; | |
146 | int status; | |
147 | ||
148 | jp = getjob(argv[1]); | |
149 | if (jp->jobctl == 0) | |
150 | error("job not created under job control"); | |
151 | pgrp = jp->ps[0].pid; | |
152 | ioctl(2, TIOCSPGRP, (char *)&pgrp); | |
153 | restartjob(jp); | |
154 | INTOFF; | |
155 | status = waitforjob(jp); | |
156 | INTON; | |
157 | return status; | |
158 | } | |
159 | ||
160 | ||
13b3e634 CZ |
161 | int |
162 | bgcmd(argc, argv) | |
163 | int argc; | |
164 | char **argv; | |
165 | { | |
d4d2fb62 KB |
166 | struct job *jp; |
167 | ||
168 | do { | |
169 | jp = getjob(*++argv); | |
170 | if (jp->jobctl == 0) | |
171 | error("job not created under job control"); | |
172 | restartjob(jp); | |
173 | } while (--argc > 1); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | ||
178 | STATIC void | |
179 | restartjob(jp) | |
180 | struct job *jp; | |
13b3e634 | 181 | { |
d4d2fb62 KB |
182 | struct procstat *ps; |
183 | int i; | |
184 | ||
185 | if (jp->state == JOBDONE) | |
186 | return; | |
187 | INTOFF; | |
188 | killpg(jp->ps[0].pid, SIGCONT); | |
189 | for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { | |
190 | if ((ps->status & 0377) == 0177) { | |
191 | ps->status = -1; | |
192 | jp->state = 0; | |
193 | } | |
194 | } | |
195 | INTON; | |
196 | } | |
197 | #endif | |
198 | ||
199 | ||
200 | int | |
13b3e634 CZ |
201 | jobscmd(argc, argv) |
202 | int argc; | |
203 | char **argv; | |
204 | { | |
d4d2fb62 KB |
205 | showjobs(0); |
206 | return 0; | |
207 | } | |
208 | ||
209 | ||
210 | /* | |
211 | * Print a list of jobs. If "change" is nonzero, only print jobs whose | |
212 | * statuses have changed since the last call to showjobs. | |
213 | * | |
214 | * If the shell is interrupted in the process of creating a job, the | |
215 | * result may be a job structure containing zero processes. Such structures | |
216 | * will be freed here. | |
217 | */ | |
218 | ||
219 | void | |
13b3e634 CZ |
220 | showjobs(change) |
221 | int change; | |
222 | { | |
d4d2fb62 KB |
223 | int jobno; |
224 | int procno; | |
225 | int i; | |
226 | struct job *jp; | |
227 | struct procstat *ps; | |
228 | int col; | |
229 | char s[64]; | |
230 | ||
231 | TRACE(("showjobs(%d) called\n", change)); | |
232 | while (dowait(0, (struct job *)NULL) > 0); | |
233 | for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { | |
234 | if (! jp->used) | |
235 | continue; | |
236 | if (jp->nprocs == 0) { | |
237 | freejob(jp); | |
238 | continue; | |
239 | } | |
240 | if (change && ! jp->changed) | |
241 | continue; | |
242 | procno = jp->nprocs; | |
243 | for (ps = jp->ps ; ; ps++) { /* for each process */ | |
244 | if (ps == jp->ps) | |
245 | fmtstr(s, 64, "[%d] %d ", jobno, ps->pid); | |
246 | else | |
247 | fmtstr(s, 64, " %d ", ps->pid); | |
248 | out1str(s); | |
249 | col = strlen(s); | |
250 | s[0] = '\0'; | |
251 | if (ps->status == -1) { | |
252 | /* don't print anything */ | |
253 | } else if ((ps->status & 0xFF) == 0) { | |
254 | fmtstr(s, 64, "Exit %d", ps->status >> 8); | |
255 | } else { | |
256 | i = ps->status; | |
257 | #if JOBS | |
258 | if ((i & 0xFF) == 0177) | |
259 | i >>= 8; | |
260 | #endif | |
f2240806 KB |
261 | if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F]) |
262 | scopy(sys_siglist[i & 0x7F], s); | |
d4d2fb62 KB |
263 | else |
264 | fmtstr(s, 64, "Signal %d", i & 0x7F); | |
265 | if (i & 0x80) | |
266 | strcat(s, " (core dumped)"); | |
267 | } | |
268 | out1str(s); | |
269 | col += strlen(s); | |
270 | do { | |
271 | out1c(' '); | |
272 | col++; | |
273 | } while (col < 30); | |
274 | out1str(ps->cmd); | |
275 | out1c('\n'); | |
276 | if (--procno <= 0) | |
277 | break; | |
278 | } | |
279 | jp->changed = 0; | |
280 | if (jp->state == JOBDONE) { | |
281 | freejob(jp); | |
282 | } | |
283 | } | |
284 | } | |
285 | ||
286 | ||
287 | /* | |
288 | * Mark a job structure as unused. | |
289 | */ | |
290 | ||
291 | STATIC void | |
292 | freejob(jp) | |
293 | struct job *jp; | |
294 | { | |
295 | struct procstat *ps; | |
296 | int i; | |
297 | ||
298 | INTOFF; | |
299 | for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { | |
300 | if (ps->cmd != nullstr) | |
301 | ckfree(ps->cmd); | |
302 | } | |
303 | if (jp->ps != &jp->ps0) | |
304 | ckfree(jp->ps); | |
305 | jp->used = 0; | |
306 | #if JOBS | |
307 | if (curjob == jp - jobtab + 1) | |
308 | curjob = 0; | |
309 | #endif | |
310 | INTON; | |
311 | } | |
312 | ||
313 | ||
314 | ||
315 | int | |
13b3e634 CZ |
316 | waitcmd(argc, argv) |
317 | int argc; | |
318 | char **argv; | |
319 | { | |
d4d2fb62 KB |
320 | struct job *job; |
321 | int status; | |
322 | struct job *jp; | |
323 | ||
324 | if (argc > 1) { | |
325 | job = getjob(argv[1]); | |
326 | } else { | |
327 | job = NULL; | |
328 | } | |
329 | for (;;) { /* loop until process terminated or stopped */ | |
330 | if (job != NULL) { | |
331 | if (job->state) { | |
332 | status = job->ps[job->nprocs - 1].status; | |
333 | if ((status & 0xFF) == 0) | |
334 | status = status >> 8 & 0xFF; | |
335 | #if JOBS | |
336 | else if ((status & 0xFF) == 0177) | |
337 | status = (status >> 8 & 0x7F) + 128; | |
338 | #endif | |
339 | else | |
340 | status = (status & 0x7F) + 128; | |
341 | if (! iflag) | |
342 | freejob(job); | |
343 | return status; | |
344 | } | |
345 | } else { | |
346 | for (jp = jobtab ; ; jp++) { | |
347 | if (jp >= jobtab + njobs) { /* no running procs */ | |
348 | return 0; | |
349 | } | |
350 | if (jp->used && jp->state == 0) | |
351 | break; | |
352 | } | |
353 | } | |
354 | dowait(1, (struct job *)NULL); | |
355 | } | |
356 | } | |
357 | ||
358 | ||
359 | ||
13b3e634 CZ |
360 | int |
361 | jobidcmd(argc, argv) | |
362 | int argc; | |
363 | char **argv; | |
364 | { | |
d4d2fb62 KB |
365 | struct job *jp; |
366 | int i; | |
367 | ||
368 | jp = getjob(argv[1]); | |
369 | for (i = 0 ; i < jp->nprocs ; ) { | |
370 | out1fmt("%d", jp->ps[i].pid); | |
371 | out1c(++i < jp->nprocs? ' ' : '\n'); | |
372 | } | |
373 | return 0; | |
374 | } | |
375 | ||
376 | ||
377 | ||
378 | /* | |
379 | * Convert a job name to a job structure. | |
380 | */ | |
381 | ||
382 | STATIC struct job * | |
383 | getjob(name) | |
384 | char *name; | |
385 | { | |
386 | int jobno; | |
387 | register struct job *jp; | |
388 | int pid; | |
389 | int i; | |
390 | ||
391 | if (name == NULL) { | |
392 | #if JOBS | |
393 | currentjob: | |
394 | if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0) | |
395 | error("No current job"); | |
396 | return &jobtab[jobno - 1]; | |
397 | #else | |
398 | error("No current job"); | |
399 | #endif | |
400 | } else if (name[0] == '%') { | |
401 | if (is_digit(name[1])) { | |
402 | jobno = number(name + 1); | |
403 | if (jobno > 0 && jobno <= njobs | |
404 | && jobtab[jobno - 1].used != 0) | |
405 | return &jobtab[jobno - 1]; | |
406 | #if JOBS | |
407 | } else if (name[1] == '%' && name[2] == '\0') { | |
408 | goto currentjob; | |
409 | #endif | |
410 | } else { | |
411 | register struct job *found = NULL; | |
412 | for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { | |
413 | if (jp->used && jp->nprocs > 0 | |
414 | && prefix(name + 1, jp->ps[0].cmd)) { | |
415 | if (found) | |
416 | error("%s: ambiguous", name); | |
417 | found = jp; | |
418 | } | |
419 | } | |
420 | if (found) | |
421 | return found; | |
422 | } | |
423 | } else if (is_number(name)) { | |
424 | pid = number(name); | |
425 | for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { | |
426 | if (jp->used && jp->nprocs > 0 | |
427 | && jp->ps[jp->nprocs - 1].pid == pid) | |
428 | return jp; | |
429 | } | |
430 | } | |
431 | error("No such job: %s", name); | |
13b3e634 CZ |
432 | /*NOTREACHED*/ |
433 | return NULL; | |
d4d2fb62 KB |
434 | } |
435 | ||
436 | ||
437 | ||
438 | /* | |
439 | * Return a new job structure, | |
440 | */ | |
441 | ||
442 | struct job * | |
443 | makejob(node, nprocs) | |
444 | union node *node; | |
13b3e634 CZ |
445 | int nprocs; |
446 | { | |
d4d2fb62 KB |
447 | int i; |
448 | struct job *jp; | |
449 | ||
450 | for (i = njobs, jp = jobtab ; ; jp++) { | |
451 | if (--i < 0) { | |
452 | INTOFF; | |
453 | if (njobs == 0) { | |
454 | jobtab = ckmalloc(4 * sizeof jobtab[0]); | |
455 | } else { | |
456 | jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); | |
13b3e634 | 457 | memcpy(jp, jobtab, njobs * sizeof jp[0]); |
d4d2fb62 KB |
458 | ckfree(jobtab); |
459 | jobtab = jp; | |
460 | } | |
461 | jp = jobtab + njobs; | |
462 | for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0); | |
463 | INTON; | |
464 | break; | |
465 | } | |
466 | if (jp->used == 0) | |
467 | break; | |
468 | } | |
469 | INTOFF; | |
470 | jp->state = 0; | |
471 | jp->used = 1; | |
472 | jp->changed = 0; | |
473 | jp->nprocs = 0; | |
474 | #if JOBS | |
475 | jp->jobctl = jobctl; | |
476 | #endif | |
477 | if (nprocs > 1) { | |
478 | jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); | |
479 | } else { | |
480 | jp->ps = &jp->ps0; | |
481 | } | |
482 | INTON; | |
13b3e634 CZ |
483 | TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs, |
484 | jp - jobtab + 1)); | |
d4d2fb62 KB |
485 | return jp; |
486 | } | |
487 | ||
488 | ||
489 | /* | |
490 | * Fork of a subshell. If we are doing job control, give the subshell its | |
491 | * own process group. Jp is a job structure that the job is to be added to. | |
492 | * N is the command that will be evaluated by the child. Both jp and n may | |
493 | * be NULL. The mode parameter can be one of the following: | |
494 | * FORK_FG - Fork off a foreground process. | |
495 | * FORK_BG - Fork off a background process. | |
496 | * FORK_NOJOB - Like FORK_FG, but don't give the process its own | |
497 | * process group even if job control is on. | |
498 | * | |
499 | * When job control is turned off, background processes have their standard | |
500 | * input redirected to /dev/null (except for the second and later processes | |
501 | * in a pipeline). | |
502 | */ | |
503 | ||
504 | int | |
505 | forkshell(jp, n, mode) | |
506 | union node *n; | |
507 | struct job *jp; | |
13b3e634 CZ |
508 | int mode; |
509 | { | |
d4d2fb62 KB |
510 | int pid; |
511 | int pgrp; | |
512 | ||
13b3e634 CZ |
513 | TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long)n, |
514 | mode)); | |
d4d2fb62 KB |
515 | INTOFF; |
516 | pid = fork(); | |
517 | if (pid == -1) { | |
518 | TRACE(("Fork failed, errno=%d\n", errno)); | |
519 | INTON; | |
520 | error("Cannot fork"); | |
521 | } | |
522 | if (pid == 0) { | |
523 | struct job *p; | |
524 | int wasroot; | |
525 | int i; | |
526 | ||
527 | TRACE(("Child shell %d\n", getpid())); | |
528 | wasroot = rootshell; | |
529 | rootshell = 0; | |
530 | for (i = njobs, p = jobtab ; --i >= 0 ; p++) | |
531 | if (p->used) | |
532 | freejob(p); | |
533 | closescript(); | |
534 | INTON; | |
535 | clear_traps(); | |
536 | #if JOBS | |
537 | jobctl = 0; /* do job control only in root shell */ | |
057eb6b7 | 538 | if (wasroot && mode != FORK_NOJOB && mflag) { |
d4d2fb62 KB |
539 | if (jp == NULL || jp->nprocs == 0) |
540 | pgrp = getpid(); | |
541 | else | |
542 | pgrp = jp->ps[0].pid; | |
543f5e91 | 543 | setpgid(0, pgrp); |
d4d2fb62 KB |
544 | if (mode == FORK_FG) { |
545 | /*** this causes superfluous TIOCSPGRPS ***/ | |
546 | if (ioctl(2, TIOCSPGRP, (char *)&pgrp) < 0) | |
547 | error("TIOCSPGRP failed, errno=%d\n", errno); | |
548 | } | |
549 | setsignal(SIGTSTP); | |
550 | setsignal(SIGTTOU); | |
551 | } else if (mode == FORK_BG) { | |
552 | ignoresig(SIGINT); | |
553 | ignoresig(SIGQUIT); | |
ddc16cae MT |
554 | if ((jp == NULL || jp->nprocs == 0) && |
555 | ! fd0_redirected_p ()) { | |
d4d2fb62 KB |
556 | close(0); |
557 | if (open("/dev/null", O_RDONLY) != 0) | |
558 | error("Can't open /dev/null"); | |
559 | } | |
560 | } | |
561 | #else | |
562 | if (mode == FORK_BG) { | |
563 | ignoresig(SIGINT); | |
564 | ignoresig(SIGQUIT); | |
ddc16cae MT |
565 | if ((jp == NULL || jp->nprocs == 0) && |
566 | ! fd0_redirected_p ()) { | |
d4d2fb62 KB |
567 | close(0); |
568 | if (open("/dev/null", O_RDONLY) != 0) | |
569 | error("Can't open /dev/null"); | |
570 | } | |
571 | } | |
572 | #endif | |
573 | if (wasroot && iflag) { | |
574 | setsignal(SIGINT); | |
575 | setsignal(SIGQUIT); | |
576 | setsignal(SIGTERM); | |
577 | } | |
578 | return pid; | |
579 | } | |
057eb6b7 | 580 | if (rootshell && mode != FORK_NOJOB && mflag) { |
d4d2fb62 KB |
581 | if (jp == NULL || jp->nprocs == 0) |
582 | pgrp = pid; | |
583 | else | |
584 | pgrp = jp->ps[0].pid; | |
543f5e91 | 585 | setpgid(pid, pgrp); |
d4d2fb62 KB |
586 | } |
587 | if (mode == FORK_BG) | |
588 | backgndpid = pid; /* set $! */ | |
589 | if (jp) { | |
590 | struct procstat *ps = &jp->ps[jp->nprocs++]; | |
591 | ps->pid = pid; | |
592 | ps->status = -1; | |
593 | ps->cmd = nullstr; | |
594 | if (iflag && rootshell && n) | |
595 | ps->cmd = commandtext(n); | |
596 | } | |
597 | INTON; | |
598 | TRACE(("In parent shell: child = %d\n", pid)); | |
599 | return pid; | |
600 | } | |
601 | ||
602 | ||
603 | ||
604 | /* | |
605 | * Wait for job to finish. | |
606 | * | |
607 | * Under job control we have the problem that while a child process is | |
608 | * running interrupts generated by the user are sent to the child but not | |
609 | * to the shell. This means that an infinite loop started by an inter- | |
610 | * active user may be hard to kill. With job control turned off, an | |
611 | * interactive user may place an interactive program inside a loop. If | |
612 | * the interactive program catches interrupts, the user doesn't want | |
613 | * these interrupts to also abort the loop. The approach we take here | |
614 | * is to have the shell ignore interrupt signals while waiting for a | |
615 | * forground process to terminate, and then send itself an interrupt | |
616 | * signal if the child process was terminated by an interrupt signal. | |
617 | * Unfortunately, some programs want to do a bit of cleanup and then | |
618 | * exit on interrupt; unless these processes terminate themselves by | |
619 | * sending a signal to themselves (instead of calling exit) they will | |
620 | * confuse this approach. | |
621 | */ | |
622 | ||
623 | int | |
624 | waitforjob(jp) | |
625 | register struct job *jp; | |
626 | { | |
627 | #if JOBS | |
af49c367 | 628 | int mypgrp = getpgrp(); |
d4d2fb62 KB |
629 | #endif |
630 | int status; | |
631 | int st; | |
632 | ||
633 | INTOFF; | |
634 | TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1)); | |
635 | while (jp->state == 0) { | |
636 | dowait(1, jp); | |
637 | } | |
638 | #if JOBS | |
639 | if (jp->jobctl) { | |
640 | if (ioctl(2, TIOCSPGRP, (char *)&mypgrp) < 0) | |
641 | error("TIOCSPGRP failed, errno=%d\n", errno); | |
642 | } | |
643 | if (jp->state == JOBSTOPPED) | |
644 | curjob = jp - jobtab + 1; | |
645 | #endif | |
646 | status = jp->ps[jp->nprocs - 1].status; | |
647 | /* convert to 8 bits */ | |
648 | if ((status & 0xFF) == 0) | |
649 | st = status >> 8 & 0xFF; | |
650 | #if JOBS | |
651 | else if ((status & 0xFF) == 0177) | |
652 | st = (status >> 8 & 0x7F) + 128; | |
653 | #endif | |
654 | else | |
655 | st = (status & 0x7F) + 128; | |
656 | if (! JOBS || jp->state == JOBDONE) | |
657 | freejob(jp); | |
658 | CLEAR_PENDING_INT; | |
659 | if ((status & 0x7F) == SIGINT) | |
660 | kill(getpid(), SIGINT); | |
661 | INTON; | |
662 | return st; | |
663 | } | |
664 | ||
665 | ||
666 | ||
667 | /* | |
668 | * Wait for a process to terminate. | |
669 | */ | |
670 | ||
671 | STATIC int | |
672 | dowait(block, job) | |
13b3e634 | 673 | int block; |
d4d2fb62 | 674 | struct job *job; |
13b3e634 | 675 | { |
d4d2fb62 KB |
676 | int pid; |
677 | int status; | |
678 | struct procstat *sp; | |
679 | struct job *jp; | |
680 | struct job *thisjob; | |
681 | int done; | |
682 | int stopped; | |
683 | int core; | |
684 | ||
685 | TRACE(("dowait(%d) called\n", block)); | |
686 | do { | |
687 | pid = waitproc(block, &status); | |
688 | TRACE(("wait returns %d, status=%d\n", pid, status)); | |
689 | } while (pid == -1 && errno == EINTR); | |
690 | if (pid <= 0) | |
691 | return pid; | |
692 | INTOFF; | |
693 | thisjob = NULL; | |
694 | for (jp = jobtab ; jp < jobtab + njobs ; jp++) { | |
695 | if (jp->used) { | |
696 | done = 1; | |
697 | stopped = 1; | |
698 | for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { | |
699 | if (sp->pid == -1) | |
700 | continue; | |
701 | if (sp->pid == pid) { | |
702 | TRACE(("Changin status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status)); | |
703 | sp->status = status; | |
704 | thisjob = jp; | |
705 | } | |
706 | if (sp->status == -1) | |
707 | stopped = 0; | |
708 | else if ((sp->status & 0377) == 0177) | |
709 | done = 0; | |
710 | } | |
711 | if (stopped) { /* stopped or done */ | |
712 | int state = done? JOBDONE : JOBSTOPPED; | |
713 | if (jp->state != state) { | |
714 | TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); | |
715 | jp->state = state; | |
716 | #if JOBS | |
717 | if (done && curjob == jp - jobtab + 1) | |
718 | curjob = 0; /* no current job */ | |
719 | #endif | |
720 | } | |
721 | } | |
722 | } | |
723 | } | |
724 | INTON; | |
725 | if (! rootshell || ! iflag || (job && thisjob == job)) { | |
726 | #if JOBS | |
727 | if ((status & 0xFF) == 0177) | |
728 | status >>= 8; | |
729 | #endif | |
730 | core = status & 0x80; | |
731 | status &= 0x7F; | |
732 | if (status != 0 && status != SIGINT && status != SIGPIPE) { | |
733 | if (thisjob != job) | |
734 | outfmt(out2, "%d: ", pid); | |
735 | #if JOBS | |
736 | if (status == SIGTSTP && rootshell && iflag) | |
737 | outfmt(out2, "%%%d ", job - jobtab + 1); | |
738 | #endif | |
f2240806 KB |
739 | if (status < NSIG && sys_siglist[status]) |
740 | out2str(sys_siglist[status]); | |
d4d2fb62 KB |
741 | else |
742 | outfmt(out2, "Signal %d", status); | |
743 | if (core) | |
744 | out2str(" - core dumped"); | |
745 | out2c('\n'); | |
746 | flushout(&errout); | |
747 | } else { | |
748 | TRACE(("Not printing status: status=%d\n", status)); | |
749 | } | |
750 | } else { | |
751 | TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job)); | |
752 | if (thisjob) | |
753 | thisjob->changed = 1; | |
754 | } | |
755 | return pid; | |
756 | } | |
757 | ||
758 | ||
759 | ||
760 | /* | |
761 | * Do a wait system call. If job control is compiled in, we accept | |
762 | * stopped processes. If block is zero, we return a value of zero | |
763 | * rather than blocking. | |
764 | * | |
765 | * System V doesn't have a non-blocking wait system call. It does | |
766 | * have a SIGCLD signal that is sent to a process when one of it's | |
767 | * children dies. The obvious way to use SIGCLD would be to install | |
768 | * a handler for SIGCLD which simply bumped a counter when a SIGCLD | |
769 | * was received, and have waitproc bump another counter when it got | |
770 | * the status of a process. Waitproc would then know that a wait | |
771 | * system call would not block if the two counters were different. | |
772 | * This approach doesn't work because if a process has children that | |
773 | * have not been waited for, System V will send it a SIGCLD when it | |
774 | * installs a signal handler for SIGCLD. What this means is that when | |
775 | * a child exits, the shell will be sent SIGCLD signals continuously | |
776 | * until is runs out of stack space, unless it does a wait call before | |
777 | * restoring the signal handler. The code below takes advantage of | |
778 | * this (mis)feature by installing a signal handler for SIGCLD and | |
779 | * then checking to see whether it was called. If there are any | |
780 | * children to be waited for, it will be. | |
781 | * | |
782 | * If neither SYSV nor BSD is defined, we don't implement nonblocking | |
783 | * waits at all. In this case, the user will not be informed when | |
784 | * a background process until the next time she runs a real program | |
785 | * (as opposed to running a builtin command or just typing return), | |
786 | * and the jobs command may give out of date information. | |
787 | */ | |
788 | ||
789 | #ifdef SYSV | |
790 | STATIC int gotsigchild; | |
791 | ||
792 | STATIC int onsigchild() { | |
793 | gotsigchild = 1; | |
794 | } | |
795 | #endif | |
796 | ||
797 | ||
798 | STATIC int | |
799 | waitproc(block, status) | |
13b3e634 | 800 | int block; |
d4d2fb62 | 801 | int *status; |
13b3e634 | 802 | { |
d4d2fb62 KB |
803 | #ifdef BSD |
804 | int flags; | |
805 | ||
806 | #if JOBS | |
807 | flags = WUNTRACED; | |
808 | #else | |
809 | flags = 0; | |
810 | #endif | |
811 | if (block == 0) | |
812 | flags |= WNOHANG; | |
057eb6b7 | 813 | return wait3(status, flags, (struct rusage *)NULL); |
d4d2fb62 KB |
814 | #else |
815 | #ifdef SYSV | |
816 | int (*save)(); | |
817 | ||
818 | if (block == 0) { | |
819 | gotsigchild = 0; | |
820 | save = signal(SIGCLD, onsigchild); | |
821 | signal(SIGCLD, save); | |
822 | if (gotsigchild == 0) | |
823 | return 0; | |
824 | } | |
825 | return wait(status); | |
826 | #else | |
827 | if (block == 0) | |
828 | return 0; | |
829 | return wait(status); | |
830 | #endif | |
831 | #endif | |
832 | } | |
833 | ||
0dc9f70e MT |
834 | /* |
835 | * return 1 if there are stopped jobs, otherwise 0 | |
836 | */ | |
837 | int job_warning = 0; | |
838 | int | |
79b6cd19 | 839 | stoppedjobs() |
0dc9f70e | 840 | { |
8979b8b4 MT |
841 | register int jobno; |
842 | register struct job *jp; | |
d4d2fb62 | 843 | |
0dc9f70e MT |
844 | if (job_warning) |
845 | return (0); | |
8979b8b4 MT |
846 | for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { |
847 | if (jp->used == 0) | |
0dc9f70e | 848 | continue; |
8979b8b4 | 849 | if (jp->state == JOBSTOPPED) { |
0dc9f70e MT |
850 | out2str("You have stopped jobs.\n"); |
851 | job_warning = 2; | |
852 | return (1); | |
853 | } | |
854 | } | |
855 | ||
856 | return (0); | |
857 | } | |
d4d2fb62 KB |
858 | |
859 | /* | |
860 | * Return a string identifying a command (to be printed by the | |
861 | * jobs command. | |
862 | */ | |
863 | ||
864 | STATIC char *cmdnextc; | |
865 | STATIC int cmdnleft; | |
866 | STATIC void cmdtxt(), cmdputs(); | |
85774404 | 867 | #define MAXCMDTEXT 200 |
d4d2fb62 | 868 | |
85774404 | 869 | char * |
d4d2fb62 KB |
870 | commandtext(n) |
871 | union node *n; | |
872 | { | |
873 | char *name; | |
874 | ||
85774404 MT |
875 | cmdnextc = name = ckmalloc(MAXCMDTEXT); |
876 | cmdnleft = MAXCMDTEXT - 4; | |
d4d2fb62 KB |
877 | cmdtxt(n); |
878 | *cmdnextc = '\0'; | |
879 | return name; | |
880 | } | |
881 | ||
882 | ||
883 | STATIC void | |
884 | cmdtxt(n) | |
885 | union node *n; | |
886 | { | |
887 | union node *np; | |
888 | struct nodelist *lp; | |
889 | char *p; | |
890 | int i; | |
891 | char s[2]; | |
892 | ||
057eb6b7 MT |
893 | if (n == NULL) |
894 | return; | |
d4d2fb62 KB |
895 | switch (n->type) { |
896 | case NSEMI: | |
897 | cmdtxt(n->nbinary.ch1); | |
898 | cmdputs("; "); | |
899 | cmdtxt(n->nbinary.ch2); | |
900 | break; | |
901 | case NAND: | |
902 | cmdtxt(n->nbinary.ch1); | |
903 | cmdputs(" && "); | |
904 | cmdtxt(n->nbinary.ch2); | |
905 | break; | |
906 | case NOR: | |
907 | cmdtxt(n->nbinary.ch1); | |
908 | cmdputs(" || "); | |
909 | cmdtxt(n->nbinary.ch2); | |
910 | break; | |
911 | case NPIPE: | |
912 | for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { | |
913 | cmdtxt(lp->n); | |
914 | if (lp->next) | |
915 | cmdputs(" | "); | |
916 | } | |
917 | break; | |
918 | case NSUBSHELL: | |
919 | cmdputs("("); | |
920 | cmdtxt(n->nredir.n); | |
921 | cmdputs(")"); | |
922 | break; | |
923 | case NREDIR: | |
924 | case NBACKGND: | |
925 | cmdtxt(n->nredir.n); | |
926 | break; | |
927 | case NIF: | |
928 | cmdputs("if "); | |
929 | cmdtxt(n->nif.test); | |
930 | cmdputs("; then "); | |
931 | cmdtxt(n->nif.ifpart); | |
932 | cmdputs("..."); | |
933 | break; | |
934 | case NWHILE: | |
935 | cmdputs("while "); | |
936 | goto until; | |
937 | case NUNTIL: | |
938 | cmdputs("until "); | |
939 | until: | |
940 | cmdtxt(n->nbinary.ch1); | |
941 | cmdputs("; do "); | |
942 | cmdtxt(n->nbinary.ch2); | |
943 | cmdputs("; done"); | |
944 | break; | |
945 | case NFOR: | |
946 | cmdputs("for "); | |
947 | cmdputs(n->nfor.var); | |
948 | cmdputs(" in ..."); | |
949 | break; | |
950 | case NCASE: | |
951 | cmdputs("case "); | |
952 | cmdputs(n->ncase.expr->narg.text); | |
953 | cmdputs(" in ..."); | |
954 | break; | |
955 | case NDEFUN: | |
956 | cmdputs(n->narg.text); | |
957 | cmdputs("() ..."); | |
958 | break; | |
959 | case NCMD: | |
960 | for (np = n->ncmd.args ; np ; np = np->narg.next) { | |
961 | cmdtxt(np); | |
962 | if (np->narg.next) | |
963 | cmdputs(" "); | |
964 | } | |
965 | for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { | |
966 | cmdputs(" "); | |
967 | cmdtxt(np); | |
968 | } | |
969 | break; | |
970 | case NARG: | |
971 | cmdputs(n->narg.text); | |
972 | break; | |
973 | case NTO: | |
974 | p = ">"; i = 1; goto redir; | |
975 | case NAPPEND: | |
976 | p = ">>"; i = 1; goto redir; | |
977 | case NTOFD: | |
978 | p = ">&"; i = 1; goto redir; | |
979 | case NFROM: | |
980 | p = "<"; i = 0; goto redir; | |
981 | case NFROMFD: | |
982 | p = "<&"; i = 0; goto redir; | |
983 | redir: | |
984 | if (n->nfile.fd != i) { | |
985 | s[0] = n->nfile.fd + '0'; | |
986 | s[1] = '\0'; | |
987 | cmdputs(s); | |
988 | } | |
989 | cmdputs(p); | |
990 | if (n->type == NTOFD || n->type == NFROMFD) { | |
991 | s[0] = n->ndup.dupfd + '0'; | |
992 | s[1] = '\0'; | |
993 | cmdputs(s); | |
994 | } else { | |
995 | cmdtxt(n->nfile.fname); | |
996 | } | |
997 | break; | |
998 | case NHERE: | |
999 | case NXHERE: | |
1000 | cmdputs("<<..."); | |
1001 | break; | |
1002 | default: | |
1003 | cmdputs("???"); | |
1004 | break; | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | ||
1009 | ||
1010 | STATIC void | |
1011 | cmdputs(s) | |
1012 | char *s; | |
1013 | { | |
1014 | register char *p, *q; | |
1015 | register char c; | |
1016 | int subtype = 0; | |
1017 | ||
1018 | if (cmdnleft <= 0) | |
1019 | return; | |
1020 | p = s; | |
1021 | q = cmdnextc; | |
1022 | while ((c = *p++) != '\0') { | |
1023 | if (c == CTLESC) | |
1024 | *q++ = *p++; | |
1025 | else if (c == CTLVAR) { | |
1026 | *q++ = '$'; | |
1027 | if (--cmdnleft > 0) | |
1028 | *q++ = '{'; | |
1029 | subtype = *p++; | |
1030 | } else if (c == '=' && subtype != 0) { | |
1031 | *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL]; | |
1032 | subtype = 0; | |
1033 | } else if (c == CTLENDVAR) { | |
1034 | *q++ = '}'; | |
1035 | } else if (c == CTLBACKQ | c == CTLBACKQ+CTLQUOTE) | |
1036 | cmdnleft++; /* ignore it */ | |
1037 | else | |
1038 | *q++ = c; | |
1039 | if (--cmdnleft <= 0) { | |
1040 | *q++ = '.'; | |
1041 | *q++ = '.'; | |
1042 | *q++ = '.'; | |
1043 | break; | |
1044 | } | |
1045 | } | |
1046 | cmdnextc = q; | |
1047 | } |