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1 | /*- |
2 | * Copyright (c) 1991 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Kenneth Almquist. | |
7 | * | |
8 | * %sccs.include.redist.c% | |
9 | */ | |
10 | ||
11 | #ifndef lint | |
12 | static char sccsid[] = "@(#)jobs.c 5.1 (Berkeley) %G%"; | |
13 | #endif /* not lint */ | |
14 | ||
15 | #include "shell.h" | |
16 | #if JOBS | |
17 | #include "sgtty.h" | |
18 | #undef CEOF /* syntax.h redefines this */ | |
19 | #endif | |
20 | #include "main.h" | |
21 | #include "parser.h" | |
22 | #include "nodes.h" | |
23 | #include "jobs.h" | |
24 | #include "options.h" | |
25 | #include "trap.h" | |
26 | #include "signames.h" | |
27 | #include "syntax.h" | |
28 | #include "input.h" | |
29 | #include "output.h" | |
30 | #include "memalloc.h" | |
31 | #include "error.h" | |
32 | #include "mystring.h" | |
33 | #include <fcntl.h> | |
34 | #include <signal.h> | |
35 | #include <errno.h> | |
36 | #ifdef BSD | |
37 | #include <sys/types.h> | |
38 | #include <sys/wait.h> | |
39 | #include <sys/time.h> | |
40 | #include <sys/resource.h> | |
41 | #endif | |
42 | ||
43 | ||
44 | ||
45 | struct job *jobtab; /* array of jobs */ | |
46 | int njobs; /* size of array */ | |
47 | MKINIT short backgndpid = -1; /* pid of last background process */ | |
48 | #if JOBS | |
49 | int initialpgrp; /* pgrp of shell on invocation */ | |
50 | short curjob; /* current job */ | |
51 | #endif | |
52 | ||
53 | #ifdef __STDC__ | |
54 | STATIC void restartjob(struct job *); | |
55 | STATIC struct job *getjob(char *); | |
56 | STATIC void freejob(struct job *); | |
57 | STATIC int procrunning(int); | |
58 | STATIC int dowait(int, struct job *); | |
59 | STATIC int waitproc(int, int *); | |
60 | STATIC char *commandtext(union node *); | |
61 | #else | |
62 | STATIC void restartjob(); | |
63 | STATIC struct job *getjob(); | |
64 | STATIC void freejob(); | |
65 | STATIC int procrunning(); | |
66 | STATIC int dowait(); | |
67 | STATIC int waitproc(); | |
68 | STATIC char *commandtext(); | |
69 | #endif | |
70 | ||
71 | ||
72 | ||
73 | #if JOBS | |
74 | /* | |
75 | * Turn job control on and off. | |
76 | * | |
77 | * Note: This code assumes that the third arg to ioctl is a character | |
78 | * pointer, which is true on Berkeley systems but not System V. Since | |
79 | * System V doesn't have job control yet, this isn't a problem now. | |
80 | */ | |
81 | ||
82 | MKINIT int jobctl; | |
83 | ||
84 | void | |
85 | setjobctl(on) { | |
86 | int ldisc; | |
87 | ||
88 | if (on == jobctl || rootshell == 0) | |
89 | return; | |
90 | if (on) { | |
91 | do { /* while we are in the background */ | |
92 | if (ioctl(2, TIOCGPGRP, (char *)&initialpgrp) < 0) { | |
93 | out2str("ash: can't access tty; job control turned off\n"); | |
94 | jflag = 0; | |
95 | return; | |
96 | } | |
97 | if (initialpgrp == -1) | |
98 | initialpgrp = getpgrp(0); | |
99 | else if (initialpgrp != getpgrp(0)) { | |
100 | killpg(initialpgrp, SIGTTIN); | |
101 | continue; | |
102 | } | |
103 | } while (0); | |
104 | if (ioctl(2, TIOCGETD, (char *)&ldisc) < 0 || ldisc != NTTYDISC) { | |
105 | out2str("ash: need new tty driver to run job control; job control turned off\n"); | |
106 | jflag = 0; | |
107 | return; | |
108 | } | |
109 | setsignal(SIGTSTP); | |
110 | setsignal(SIGTTOU); | |
111 | setpgrp(0, rootpid); | |
112 | ioctl(2, TIOCSPGRP, (char *)&rootpid); | |
113 | } else { /* turning job control off */ | |
114 | setpgrp(0, initialpgrp); | |
115 | ioctl(2, TIOCSPGRP, (char *)&initialpgrp); | |
116 | setsignal(SIGTSTP); | |
117 | setsignal(SIGTTOU); | |
118 | } | |
119 | jobctl = on; | |
120 | } | |
121 | #endif | |
122 | ||
123 | ||
124 | #ifdef mkinit | |
125 | ||
126 | SHELLPROC { | |
127 | backgndpid = -1; | |
128 | #if JOBS | |
129 | jobctl = 0; | |
130 | #endif | |
131 | } | |
132 | ||
133 | #endif | |
134 | ||
135 | ||
136 | ||
137 | #if JOBS | |
138 | fgcmd(argc, argv) char **argv; { | |
139 | struct job *jp; | |
140 | int pgrp; | |
141 | int status; | |
142 | ||
143 | jp = getjob(argv[1]); | |
144 | if (jp->jobctl == 0) | |
145 | error("job not created under job control"); | |
146 | pgrp = jp->ps[0].pid; | |
147 | ioctl(2, TIOCSPGRP, (char *)&pgrp); | |
148 | restartjob(jp); | |
149 | INTOFF; | |
150 | status = waitforjob(jp); | |
151 | INTON; | |
152 | return status; | |
153 | } | |
154 | ||
155 | ||
156 | bgcmd(argc, argv) char **argv; { | |
157 | struct job *jp; | |
158 | ||
159 | do { | |
160 | jp = getjob(*++argv); | |
161 | if (jp->jobctl == 0) | |
162 | error("job not created under job control"); | |
163 | restartjob(jp); | |
164 | } while (--argc > 1); | |
165 | return 0; | |
166 | } | |
167 | ||
168 | ||
169 | STATIC void | |
170 | restartjob(jp) | |
171 | struct job *jp; | |
172 | { | |
173 | struct procstat *ps; | |
174 | int i; | |
175 | ||
176 | if (jp->state == JOBDONE) | |
177 | return; | |
178 | INTOFF; | |
179 | killpg(jp->ps[0].pid, SIGCONT); | |
180 | for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { | |
181 | if ((ps->status & 0377) == 0177) { | |
182 | ps->status = -1; | |
183 | jp->state = 0; | |
184 | } | |
185 | } | |
186 | INTON; | |
187 | } | |
188 | #endif | |
189 | ||
190 | ||
191 | int | |
192 | jobscmd(argc, argv) char **argv; { | |
193 | showjobs(0); | |
194 | return 0; | |
195 | } | |
196 | ||
197 | ||
198 | /* | |
199 | * Print a list of jobs. If "change" is nonzero, only print jobs whose | |
200 | * statuses have changed since the last call to showjobs. | |
201 | * | |
202 | * If the shell is interrupted in the process of creating a job, the | |
203 | * result may be a job structure containing zero processes. Such structures | |
204 | * will be freed here. | |
205 | */ | |
206 | ||
207 | void | |
208 | showjobs(change) { | |
209 | int jobno; | |
210 | int procno; | |
211 | int i; | |
212 | struct job *jp; | |
213 | struct procstat *ps; | |
214 | int col; | |
215 | char s[64]; | |
216 | ||
217 | TRACE(("showjobs(%d) called\n", change)); | |
218 | while (dowait(0, (struct job *)NULL) > 0); | |
219 | for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { | |
220 | if (! jp->used) | |
221 | continue; | |
222 | if (jp->nprocs == 0) { | |
223 | freejob(jp); | |
224 | continue; | |
225 | } | |
226 | if (change && ! jp->changed) | |
227 | continue; | |
228 | procno = jp->nprocs; | |
229 | for (ps = jp->ps ; ; ps++) { /* for each process */ | |
230 | if (ps == jp->ps) | |
231 | fmtstr(s, 64, "[%d] %d ", jobno, ps->pid); | |
232 | else | |
233 | fmtstr(s, 64, " %d ", ps->pid); | |
234 | out1str(s); | |
235 | col = strlen(s); | |
236 | s[0] = '\0'; | |
237 | if (ps->status == -1) { | |
238 | /* don't print anything */ | |
239 | } else if ((ps->status & 0xFF) == 0) { | |
240 | fmtstr(s, 64, "Exit %d", ps->status >> 8); | |
241 | } else { | |
242 | i = ps->status; | |
243 | #if JOBS | |
244 | if ((i & 0xFF) == 0177) | |
245 | i >>= 8; | |
246 | #endif | |
247 | if ((i & 0x7F) <= MAXSIG && sigmesg[i & 0x7F]) | |
248 | scopy(sigmesg[i & 0x7F], s); | |
249 | else | |
250 | fmtstr(s, 64, "Signal %d", i & 0x7F); | |
251 | if (i & 0x80) | |
252 | strcat(s, " (core dumped)"); | |
253 | } | |
254 | out1str(s); | |
255 | col += strlen(s); | |
256 | do { | |
257 | out1c(' '); | |
258 | col++; | |
259 | } while (col < 30); | |
260 | out1str(ps->cmd); | |
261 | out1c('\n'); | |
262 | if (--procno <= 0) | |
263 | break; | |
264 | } | |
265 | jp->changed = 0; | |
266 | if (jp->state == JOBDONE) { | |
267 | freejob(jp); | |
268 | } | |
269 | } | |
270 | } | |
271 | ||
272 | ||
273 | /* | |
274 | * Mark a job structure as unused. | |
275 | */ | |
276 | ||
277 | STATIC void | |
278 | freejob(jp) | |
279 | struct job *jp; | |
280 | { | |
281 | struct procstat *ps; | |
282 | int i; | |
283 | ||
284 | INTOFF; | |
285 | for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { | |
286 | if (ps->cmd != nullstr) | |
287 | ckfree(ps->cmd); | |
288 | } | |
289 | if (jp->ps != &jp->ps0) | |
290 | ckfree(jp->ps); | |
291 | jp->used = 0; | |
292 | #if JOBS | |
293 | if (curjob == jp - jobtab + 1) | |
294 | curjob = 0; | |
295 | #endif | |
296 | INTON; | |
297 | } | |
298 | ||
299 | ||
300 | ||
301 | int | |
302 | waitcmd(argc, argv) char **argv; { | |
303 | struct job *job; | |
304 | int status; | |
305 | struct job *jp; | |
306 | ||
307 | if (argc > 1) { | |
308 | job = getjob(argv[1]); | |
309 | } else { | |
310 | job = NULL; | |
311 | } | |
312 | for (;;) { /* loop until process terminated or stopped */ | |
313 | if (job != NULL) { | |
314 | if (job->state) { | |
315 | status = job->ps[job->nprocs - 1].status; | |
316 | if ((status & 0xFF) == 0) | |
317 | status = status >> 8 & 0xFF; | |
318 | #if JOBS | |
319 | else if ((status & 0xFF) == 0177) | |
320 | status = (status >> 8 & 0x7F) + 128; | |
321 | #endif | |
322 | else | |
323 | status = (status & 0x7F) + 128; | |
324 | if (! iflag) | |
325 | freejob(job); | |
326 | return status; | |
327 | } | |
328 | } else { | |
329 | for (jp = jobtab ; ; jp++) { | |
330 | if (jp >= jobtab + njobs) { /* no running procs */ | |
331 | return 0; | |
332 | } | |
333 | if (jp->used && jp->state == 0) | |
334 | break; | |
335 | } | |
336 | } | |
337 | dowait(1, (struct job *)NULL); | |
338 | } | |
339 | } | |
340 | ||
341 | ||
342 | ||
343 | jobidcmd(argc, argv) char **argv; { | |
344 | struct job *jp; | |
345 | int i; | |
346 | ||
347 | jp = getjob(argv[1]); | |
348 | for (i = 0 ; i < jp->nprocs ; ) { | |
349 | out1fmt("%d", jp->ps[i].pid); | |
350 | out1c(++i < jp->nprocs? ' ' : '\n'); | |
351 | } | |
352 | return 0; | |
353 | } | |
354 | ||
355 | ||
356 | ||
357 | /* | |
358 | * Convert a job name to a job structure. | |
359 | */ | |
360 | ||
361 | STATIC struct job * | |
362 | getjob(name) | |
363 | char *name; | |
364 | { | |
365 | int jobno; | |
366 | register struct job *jp; | |
367 | int pid; | |
368 | int i; | |
369 | ||
370 | if (name == NULL) { | |
371 | #if JOBS | |
372 | currentjob: | |
373 | if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0) | |
374 | error("No current job"); | |
375 | return &jobtab[jobno - 1]; | |
376 | #else | |
377 | error("No current job"); | |
378 | #endif | |
379 | } else if (name[0] == '%') { | |
380 | if (is_digit(name[1])) { | |
381 | jobno = number(name + 1); | |
382 | if (jobno > 0 && jobno <= njobs | |
383 | && jobtab[jobno - 1].used != 0) | |
384 | return &jobtab[jobno - 1]; | |
385 | #if JOBS | |
386 | } else if (name[1] == '%' && name[2] == '\0') { | |
387 | goto currentjob; | |
388 | #endif | |
389 | } else { | |
390 | register struct job *found = NULL; | |
391 | for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { | |
392 | if (jp->used && jp->nprocs > 0 | |
393 | && prefix(name + 1, jp->ps[0].cmd)) { | |
394 | if (found) | |
395 | error("%s: ambiguous", name); | |
396 | found = jp; | |
397 | } | |
398 | } | |
399 | if (found) | |
400 | return found; | |
401 | } | |
402 | } else if (is_number(name)) { | |
403 | pid = number(name); | |
404 | for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { | |
405 | if (jp->used && jp->nprocs > 0 | |
406 | && jp->ps[jp->nprocs - 1].pid == pid) | |
407 | return jp; | |
408 | } | |
409 | } | |
410 | error("No such job: %s", name); | |
411 | } | |
412 | ||
413 | ||
414 | ||
415 | /* | |
416 | * Return a new job structure, | |
417 | */ | |
418 | ||
419 | struct job * | |
420 | makejob(node, nprocs) | |
421 | union node *node; | |
422 | { | |
423 | int i; | |
424 | struct job *jp; | |
425 | ||
426 | for (i = njobs, jp = jobtab ; ; jp++) { | |
427 | if (--i < 0) { | |
428 | INTOFF; | |
429 | if (njobs == 0) { | |
430 | jobtab = ckmalloc(4 * sizeof jobtab[0]); | |
431 | } else { | |
432 | jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); | |
433 | bcopy(jobtab, jp, njobs * sizeof jp[0]); | |
434 | ckfree(jobtab); | |
435 | jobtab = jp; | |
436 | } | |
437 | jp = jobtab + njobs; | |
438 | for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0); | |
439 | INTON; | |
440 | break; | |
441 | } | |
442 | if (jp->used == 0) | |
443 | break; | |
444 | } | |
445 | INTOFF; | |
446 | jp->state = 0; | |
447 | jp->used = 1; | |
448 | jp->changed = 0; | |
449 | jp->nprocs = 0; | |
450 | #if JOBS | |
451 | jp->jobctl = jobctl; | |
452 | #endif | |
453 | if (nprocs > 1) { | |
454 | jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); | |
455 | } else { | |
456 | jp->ps = &jp->ps0; | |
457 | } | |
458 | INTON; | |
459 | TRACE(("makejob(0x%x, %d) returns %%%d\n", (int)node, nprocs, jp - jobtab + 1)); | |
460 | return jp; | |
461 | } | |
462 | ||
463 | ||
464 | /* | |
465 | * Fork of a subshell. If we are doing job control, give the subshell its | |
466 | * own process group. Jp is a job structure that the job is to be added to. | |
467 | * N is the command that will be evaluated by the child. Both jp and n may | |
468 | * be NULL. The mode parameter can be one of the following: | |
469 | * FORK_FG - Fork off a foreground process. | |
470 | * FORK_BG - Fork off a background process. | |
471 | * FORK_NOJOB - Like FORK_FG, but don't give the process its own | |
472 | * process group even if job control is on. | |
473 | * | |
474 | * When job control is turned off, background processes have their standard | |
475 | * input redirected to /dev/null (except for the second and later processes | |
476 | * in a pipeline). | |
477 | */ | |
478 | ||
479 | int | |
480 | forkshell(jp, n, mode) | |
481 | union node *n; | |
482 | struct job *jp; | |
483 | { | |
484 | int pid; | |
485 | int pgrp; | |
486 | ||
487 | TRACE(("forkshell(%%%d, 0x%x, %d) called\n", jp - jobtab, (int)n, mode)); | |
488 | INTOFF; | |
489 | pid = fork(); | |
490 | if (pid == -1) { | |
491 | TRACE(("Fork failed, errno=%d\n", errno)); | |
492 | INTON; | |
493 | error("Cannot fork"); | |
494 | } | |
495 | if (pid == 0) { | |
496 | struct job *p; | |
497 | int wasroot; | |
498 | int i; | |
499 | ||
500 | TRACE(("Child shell %d\n", getpid())); | |
501 | wasroot = rootshell; | |
502 | rootshell = 0; | |
503 | for (i = njobs, p = jobtab ; --i >= 0 ; p++) | |
504 | if (p->used) | |
505 | freejob(p); | |
506 | closescript(); | |
507 | INTON; | |
508 | clear_traps(); | |
509 | #if JOBS | |
510 | jobctl = 0; /* do job control only in root shell */ | |
511 | if (wasroot && mode != FORK_NOJOB && jflag) { | |
512 | if (jp == NULL || jp->nprocs == 0) | |
513 | pgrp = getpid(); | |
514 | else | |
515 | pgrp = jp->ps[0].pid; | |
516 | setpgrp(0, pgrp); | |
517 | if (mode == FORK_FG) { | |
518 | /*** this causes superfluous TIOCSPGRPS ***/ | |
519 | if (ioctl(2, TIOCSPGRP, (char *)&pgrp) < 0) | |
520 | error("TIOCSPGRP failed, errno=%d\n", errno); | |
521 | } | |
522 | setsignal(SIGTSTP); | |
523 | setsignal(SIGTTOU); | |
524 | } else if (mode == FORK_BG) { | |
525 | ignoresig(SIGINT); | |
526 | ignoresig(SIGQUIT); | |
527 | if (jp == NULL || jp->nprocs == 0) { | |
528 | close(0); | |
529 | if (open("/dev/null", O_RDONLY) != 0) | |
530 | error("Can't open /dev/null"); | |
531 | } | |
532 | } | |
533 | #else | |
534 | if (mode == FORK_BG) { | |
535 | ignoresig(SIGINT); | |
536 | ignoresig(SIGQUIT); | |
537 | if (jp == NULL || jp->nprocs == 0) { | |
538 | close(0); | |
539 | if (open("/dev/null", O_RDONLY) != 0) | |
540 | error("Can't open /dev/null"); | |
541 | } | |
542 | } | |
543 | #endif | |
544 | if (wasroot && iflag) { | |
545 | setsignal(SIGINT); | |
546 | setsignal(SIGQUIT); | |
547 | setsignal(SIGTERM); | |
548 | } | |
549 | return pid; | |
550 | } | |
551 | if (rootshell && mode != FORK_NOJOB && jflag) { | |
552 | if (jp == NULL || jp->nprocs == 0) | |
553 | pgrp = pid; | |
554 | else | |
555 | pgrp = jp->ps[0].pid; | |
556 | setpgrp(pid, pgrp); | |
557 | } | |
558 | if (mode == FORK_BG) | |
559 | backgndpid = pid; /* set $! */ | |
560 | if (jp) { | |
561 | struct procstat *ps = &jp->ps[jp->nprocs++]; | |
562 | ps->pid = pid; | |
563 | ps->status = -1; | |
564 | ps->cmd = nullstr; | |
565 | if (iflag && rootshell && n) | |
566 | ps->cmd = commandtext(n); | |
567 | } | |
568 | INTON; | |
569 | TRACE(("In parent shell: child = %d\n", pid)); | |
570 | return pid; | |
571 | } | |
572 | ||
573 | ||
574 | ||
575 | /* | |
576 | * Wait for job to finish. | |
577 | * | |
578 | * Under job control we have the problem that while a child process is | |
579 | * running interrupts generated by the user are sent to the child but not | |
580 | * to the shell. This means that an infinite loop started by an inter- | |
581 | * active user may be hard to kill. With job control turned off, an | |
582 | * interactive user may place an interactive program inside a loop. If | |
583 | * the interactive program catches interrupts, the user doesn't want | |
584 | * these interrupts to also abort the loop. The approach we take here | |
585 | * is to have the shell ignore interrupt signals while waiting for a | |
586 | * forground process to terminate, and then send itself an interrupt | |
587 | * signal if the child process was terminated by an interrupt signal. | |
588 | * Unfortunately, some programs want to do a bit of cleanup and then | |
589 | * exit on interrupt; unless these processes terminate themselves by | |
590 | * sending a signal to themselves (instead of calling exit) they will | |
591 | * confuse this approach. | |
592 | */ | |
593 | ||
594 | int | |
595 | waitforjob(jp) | |
596 | register struct job *jp; | |
597 | { | |
598 | #if JOBS | |
599 | int mypgrp = getpgrp(0); | |
600 | #endif | |
601 | int status; | |
602 | int st; | |
603 | ||
604 | INTOFF; | |
605 | TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1)); | |
606 | while (jp->state == 0) { | |
607 | dowait(1, jp); | |
608 | } | |
609 | #if JOBS | |
610 | if (jp->jobctl) { | |
611 | if (ioctl(2, TIOCSPGRP, (char *)&mypgrp) < 0) | |
612 | error("TIOCSPGRP failed, errno=%d\n", errno); | |
613 | } | |
614 | if (jp->state == JOBSTOPPED) | |
615 | curjob = jp - jobtab + 1; | |
616 | #endif | |
617 | status = jp->ps[jp->nprocs - 1].status; | |
618 | /* convert to 8 bits */ | |
619 | if ((status & 0xFF) == 0) | |
620 | st = status >> 8 & 0xFF; | |
621 | #if JOBS | |
622 | else if ((status & 0xFF) == 0177) | |
623 | st = (status >> 8 & 0x7F) + 128; | |
624 | #endif | |
625 | else | |
626 | st = (status & 0x7F) + 128; | |
627 | if (! JOBS || jp->state == JOBDONE) | |
628 | freejob(jp); | |
629 | CLEAR_PENDING_INT; | |
630 | if ((status & 0x7F) == SIGINT) | |
631 | kill(getpid(), SIGINT); | |
632 | INTON; | |
633 | return st; | |
634 | } | |
635 | ||
636 | ||
637 | ||
638 | /* | |
639 | * Wait for a process to terminate. | |
640 | */ | |
641 | ||
642 | STATIC int | |
643 | dowait(block, job) | |
644 | struct job *job; | |
645 | { | |
646 | int pid; | |
647 | int status; | |
648 | struct procstat *sp; | |
649 | struct job *jp; | |
650 | struct job *thisjob; | |
651 | int done; | |
652 | int stopped; | |
653 | int core; | |
654 | ||
655 | TRACE(("dowait(%d) called\n", block)); | |
656 | do { | |
657 | pid = waitproc(block, &status); | |
658 | TRACE(("wait returns %d, status=%d\n", pid, status)); | |
659 | } while (pid == -1 && errno == EINTR); | |
660 | if (pid <= 0) | |
661 | return pid; | |
662 | INTOFF; | |
663 | thisjob = NULL; | |
664 | for (jp = jobtab ; jp < jobtab + njobs ; jp++) { | |
665 | if (jp->used) { | |
666 | done = 1; | |
667 | stopped = 1; | |
668 | for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { | |
669 | if (sp->pid == -1) | |
670 | continue; | |
671 | if (sp->pid == pid) { | |
672 | TRACE(("Changin status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status)); | |
673 | sp->status = status; | |
674 | thisjob = jp; | |
675 | } | |
676 | if (sp->status == -1) | |
677 | stopped = 0; | |
678 | else if ((sp->status & 0377) == 0177) | |
679 | done = 0; | |
680 | } | |
681 | if (stopped) { /* stopped or done */ | |
682 | int state = done? JOBDONE : JOBSTOPPED; | |
683 | if (jp->state != state) { | |
684 | TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); | |
685 | jp->state = state; | |
686 | #if JOBS | |
687 | if (done && curjob == jp - jobtab + 1) | |
688 | curjob = 0; /* no current job */ | |
689 | #endif | |
690 | } | |
691 | } | |
692 | } | |
693 | } | |
694 | INTON; | |
695 | if (! rootshell || ! iflag || (job && thisjob == job)) { | |
696 | #if JOBS | |
697 | if ((status & 0xFF) == 0177) | |
698 | status >>= 8; | |
699 | #endif | |
700 | core = status & 0x80; | |
701 | status &= 0x7F; | |
702 | if (status != 0 && status != SIGINT && status != SIGPIPE) { | |
703 | if (thisjob != job) | |
704 | outfmt(out2, "%d: ", pid); | |
705 | #if JOBS | |
706 | if (status == SIGTSTP && rootshell && iflag) | |
707 | outfmt(out2, "%%%d ", job - jobtab + 1); | |
708 | #endif | |
709 | if (status <= MAXSIG && sigmesg[status]) | |
710 | out2str(sigmesg[status]); | |
711 | else | |
712 | outfmt(out2, "Signal %d", status); | |
713 | if (core) | |
714 | out2str(" - core dumped"); | |
715 | out2c('\n'); | |
716 | flushout(&errout); | |
717 | } else { | |
718 | TRACE(("Not printing status: status=%d\n", status)); | |
719 | } | |
720 | } else { | |
721 | TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job)); | |
722 | if (thisjob) | |
723 | thisjob->changed = 1; | |
724 | } | |
725 | return pid; | |
726 | } | |
727 | ||
728 | ||
729 | ||
730 | /* | |
731 | * Do a wait system call. If job control is compiled in, we accept | |
732 | * stopped processes. If block is zero, we return a value of zero | |
733 | * rather than blocking. | |
734 | * | |
735 | * System V doesn't have a non-blocking wait system call. It does | |
736 | * have a SIGCLD signal that is sent to a process when one of it's | |
737 | * children dies. The obvious way to use SIGCLD would be to install | |
738 | * a handler for SIGCLD which simply bumped a counter when a SIGCLD | |
739 | * was received, and have waitproc bump another counter when it got | |
740 | * the status of a process. Waitproc would then know that a wait | |
741 | * system call would not block if the two counters were different. | |
742 | * This approach doesn't work because if a process has children that | |
743 | * have not been waited for, System V will send it a SIGCLD when it | |
744 | * installs a signal handler for SIGCLD. What this means is that when | |
745 | * a child exits, the shell will be sent SIGCLD signals continuously | |
746 | * until is runs out of stack space, unless it does a wait call before | |
747 | * restoring the signal handler. The code below takes advantage of | |
748 | * this (mis)feature by installing a signal handler for SIGCLD and | |
749 | * then checking to see whether it was called. If there are any | |
750 | * children to be waited for, it will be. | |
751 | * | |
752 | * If neither SYSV nor BSD is defined, we don't implement nonblocking | |
753 | * waits at all. In this case, the user will not be informed when | |
754 | * a background process until the next time she runs a real program | |
755 | * (as opposed to running a builtin command or just typing return), | |
756 | * and the jobs command may give out of date information. | |
757 | */ | |
758 | ||
759 | #ifdef SYSV | |
760 | STATIC int gotsigchild; | |
761 | ||
762 | STATIC int onsigchild() { | |
763 | gotsigchild = 1; | |
764 | } | |
765 | #endif | |
766 | ||
767 | ||
768 | STATIC int | |
769 | waitproc(block, status) | |
770 | int *status; | |
771 | { | |
772 | #ifdef BSD | |
773 | int flags; | |
774 | ||
775 | #if JOBS | |
776 | flags = WUNTRACED; | |
777 | #else | |
778 | flags = 0; | |
779 | #endif | |
780 | if (block == 0) | |
781 | flags |= WNOHANG; | |
782 | return wait3((union wait *)status, flags, (struct rusage *)NULL); | |
783 | #else | |
784 | #ifdef SYSV | |
785 | int (*save)(); | |
786 | ||
787 | if (block == 0) { | |
788 | gotsigchild = 0; | |
789 | save = signal(SIGCLD, onsigchild); | |
790 | signal(SIGCLD, save); | |
791 | if (gotsigchild == 0) | |
792 | return 0; | |
793 | } | |
794 | return wait(status); | |
795 | #else | |
796 | if (block == 0) | |
797 | return 0; | |
798 | return wait(status); | |
799 | #endif | |
800 | #endif | |
801 | } | |
802 | ||
803 | ||
804 | ||
805 | /* | |
806 | * Return a string identifying a command (to be printed by the | |
807 | * jobs command. | |
808 | */ | |
809 | ||
810 | STATIC char *cmdnextc; | |
811 | STATIC int cmdnleft; | |
812 | STATIC void cmdtxt(), cmdputs(); | |
813 | ||
814 | STATIC char * | |
815 | commandtext(n) | |
816 | union node *n; | |
817 | { | |
818 | char *name; | |
819 | ||
820 | cmdnextc = name = ckmalloc(50); | |
821 | cmdnleft = 50 - 4; | |
822 | cmdtxt(n); | |
823 | *cmdnextc = '\0'; | |
824 | return name; | |
825 | } | |
826 | ||
827 | ||
828 | STATIC void | |
829 | cmdtxt(n) | |
830 | union node *n; | |
831 | { | |
832 | union node *np; | |
833 | struct nodelist *lp; | |
834 | char *p; | |
835 | int i; | |
836 | char s[2]; | |
837 | ||
838 | switch (n->type) { | |
839 | case NSEMI: | |
840 | cmdtxt(n->nbinary.ch1); | |
841 | cmdputs("; "); | |
842 | cmdtxt(n->nbinary.ch2); | |
843 | break; | |
844 | case NAND: | |
845 | cmdtxt(n->nbinary.ch1); | |
846 | cmdputs(" && "); | |
847 | cmdtxt(n->nbinary.ch2); | |
848 | break; | |
849 | case NOR: | |
850 | cmdtxt(n->nbinary.ch1); | |
851 | cmdputs(" || "); | |
852 | cmdtxt(n->nbinary.ch2); | |
853 | break; | |
854 | case NPIPE: | |
855 | for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { | |
856 | cmdtxt(lp->n); | |
857 | if (lp->next) | |
858 | cmdputs(" | "); | |
859 | } | |
860 | break; | |
861 | case NSUBSHELL: | |
862 | cmdputs("("); | |
863 | cmdtxt(n->nredir.n); | |
864 | cmdputs(")"); | |
865 | break; | |
866 | case NREDIR: | |
867 | case NBACKGND: | |
868 | cmdtxt(n->nredir.n); | |
869 | break; | |
870 | case NIF: | |
871 | cmdputs("if "); | |
872 | cmdtxt(n->nif.test); | |
873 | cmdputs("; then "); | |
874 | cmdtxt(n->nif.ifpart); | |
875 | cmdputs("..."); | |
876 | break; | |
877 | case NWHILE: | |
878 | cmdputs("while "); | |
879 | goto until; | |
880 | case NUNTIL: | |
881 | cmdputs("until "); | |
882 | until: | |
883 | cmdtxt(n->nbinary.ch1); | |
884 | cmdputs("; do "); | |
885 | cmdtxt(n->nbinary.ch2); | |
886 | cmdputs("; done"); | |
887 | break; | |
888 | case NFOR: | |
889 | cmdputs("for "); | |
890 | cmdputs(n->nfor.var); | |
891 | cmdputs(" in ..."); | |
892 | break; | |
893 | case NCASE: | |
894 | cmdputs("case "); | |
895 | cmdputs(n->ncase.expr->narg.text); | |
896 | cmdputs(" in ..."); | |
897 | break; | |
898 | case NDEFUN: | |
899 | cmdputs(n->narg.text); | |
900 | cmdputs("() ..."); | |
901 | break; | |
902 | case NCMD: | |
903 | for (np = n->ncmd.args ; np ; np = np->narg.next) { | |
904 | cmdtxt(np); | |
905 | if (np->narg.next) | |
906 | cmdputs(" "); | |
907 | } | |
908 | for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { | |
909 | cmdputs(" "); | |
910 | cmdtxt(np); | |
911 | } | |
912 | break; | |
913 | case NARG: | |
914 | cmdputs(n->narg.text); | |
915 | break; | |
916 | case NTO: | |
917 | p = ">"; i = 1; goto redir; | |
918 | case NAPPEND: | |
919 | p = ">>"; i = 1; goto redir; | |
920 | case NTOFD: | |
921 | p = ">&"; i = 1; goto redir; | |
922 | case NFROM: | |
923 | p = "<"; i = 0; goto redir; | |
924 | case NFROMFD: | |
925 | p = "<&"; i = 0; goto redir; | |
926 | redir: | |
927 | if (n->nfile.fd != i) { | |
928 | s[0] = n->nfile.fd + '0'; | |
929 | s[1] = '\0'; | |
930 | cmdputs(s); | |
931 | } | |
932 | cmdputs(p); | |
933 | if (n->type == NTOFD || n->type == NFROMFD) { | |
934 | s[0] = n->ndup.dupfd + '0'; | |
935 | s[1] = '\0'; | |
936 | cmdputs(s); | |
937 | } else { | |
938 | cmdtxt(n->nfile.fname); | |
939 | } | |
940 | break; | |
941 | case NHERE: | |
942 | case NXHERE: | |
943 | cmdputs("<<..."); | |
944 | break; | |
945 | default: | |
946 | cmdputs("???"); | |
947 | break; | |
948 | } | |
949 | } | |
950 | ||
951 | ||
952 | ||
953 | STATIC void | |
954 | cmdputs(s) | |
955 | char *s; | |
956 | { | |
957 | register char *p, *q; | |
958 | register char c; | |
959 | int subtype = 0; | |
960 | ||
961 | if (cmdnleft <= 0) | |
962 | return; | |
963 | p = s; | |
964 | q = cmdnextc; | |
965 | while ((c = *p++) != '\0') { | |
966 | if (c == CTLESC) | |
967 | *q++ = *p++; | |
968 | else if (c == CTLVAR) { | |
969 | *q++ = '$'; | |
970 | if (--cmdnleft > 0) | |
971 | *q++ = '{'; | |
972 | subtype = *p++; | |
973 | } else if (c == '=' && subtype != 0) { | |
974 | *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL]; | |
975 | subtype = 0; | |
976 | } else if (c == CTLENDVAR) { | |
977 | *q++ = '}'; | |
978 | } else if (c == CTLBACKQ | c == CTLBACKQ+CTLQUOTE) | |
979 | cmdnleft++; /* ignore it */ | |
980 | else | |
981 | *q++ = c; | |
982 | if (--cmdnleft <= 0) { | |
983 | *q++ = '.'; | |
984 | *q++ = '.'; | |
985 | *q++ = '.'; | |
986 | break; | |
987 | } | |
988 | } | |
989 | cmdnextc = q; | |
990 | } |