1 /*
2 * sh.proc.c: Job manipulations
3 */
4 /*-
5 * Copyright (c) 1980, 1991 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32 #include "sh.h"
33 #include "ed.h"
34 #include "tc.h"
35 #include "tc.wait.h"
36
37 #ifdef WINNT_NATIVE
38 #undef POSIX
39 #define POSIX
40 #endif /* WINNT_NATIVE */
41 #ifdef aiws
42 # undef HZ
43 # define HZ 16
44 #endif /* aiws */
45
46 #if defined(_BSD) || (defined(IRIS4D) && __STDC__) || defined(__lucid)
47 # define BSDWAIT
48 #endif /* _BSD || (IRIS4D && __STDC__) || __lucid */
49 #ifndef WTERMSIG
50 # define WTERMSIG(w) (((union wait *) &(w))->w_termsig)
51 # ifndef BSDWAIT
52 # define BSDWAIT
53 # endif /* !BSDWAIT */
54 #endif /* !WTERMSIG */
55 #ifndef WEXITSTATUS
56 # define WEXITSTATUS(w) (((union wait *) &(w))->w_retcode)
57 #endif /* !WEXITSTATUS */
58 #ifndef WSTOPSIG
59 # define WSTOPSIG(w) (((union wait *) &(w))->w_stopsig)
60 #endif /* !WSTOPSIG */
61
62 #ifdef __osf__
63 # ifndef WCOREDUMP
64 # define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG)
65 # endif
66 #endif
67
68 #ifndef WCOREDUMP
69 # ifdef BSDWAIT
70 # define WCOREDUMP(w) (((union wait *) &(w))->w_coredump)
71 # else /* !BSDWAIT */
72 # define WCOREDUMP(w) ((w) & 0200)
73 # endif /* !BSDWAIT */
74 #endif /* !WCOREDUMP */
75
76 #ifndef JOBDEBUG
77 # define jobdebug_xprintf(x) (void)0
78 # define jobdebug_flush() (void)0
79 #else
80 # define jobdebug_xprintf(s) xprintf s
81 # define jobdebug_flush() flush()
82 #endif
83
84 /*
85 * C Shell - functions that manage processes, handling hanging, termination
86 */
87
88 #define BIGINDEX 9 /* largest desirable job index */
89
90 #ifdef BSDTIMES
91 # ifdef convex
92 /* use 'cvxrusage' to get parallel statistics */
93 static struct cvxrusage zru = {{0L, 0L}, {0L, 0L}, 0L, 0L, 0L, 0L,
94 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
95 {0L, 0L}, 0LL, 0LL, 0LL, 0LL, 0L, 0L, 0L,
96 0LL, 0LL, {0L, 0L, 0L, 0L, 0L}};
97 # else
98 static struct rusage zru;
99 # endif /* convex */
100 #else /* !BSDTIMES */
101 # ifdef _SEQUENT_
102 static struct process_stats zru = {{0L, 0L}, {0L, 0L}, 0, 0, 0, 0, 0, 0, 0,
103 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
104 # else /* !_SEQUENT_ */
105 # ifdef _SX
106 static struct tms zru = {0, 0, 0, 0}, lru = {0, 0, 0, 0};
107 # else /* !_SX */
108 static struct tms zru = {0L, 0L, 0L, 0L}, lru = {0L, 0L, 0L, 0L};
109 # endif /* !_SX */
110 # endif /* !_SEQUENT_ */
111 #endif /* !BSDTIMES */
112
113 #ifndef BSDTIMES
114 static int timesdone; /* shtimes buffer full ? */
115 #endif /* BSDTIMES */
116
117 #ifndef RUSAGE_CHILDREN
118 # define RUSAGE_CHILDREN -1
119 #endif /* RUSAGE_CHILDREN */
120
121 static void pflushall (void);
122 static void pflush (struct process *);
123 static void pfree (struct process *);
124 static void pclrcurr (struct process *);
125 static void morecommand (size_t);
126 static void padd (struct command *);
127 static int pprint (struct process *, int);
128 static void ptprint (struct process *);
129 static void pads (Char *);
130 static void pkill (Char **, int);
131 static struct process *pgetcurr (struct process *);
132 static void okpcntl (void);
133 static void setttypgrp (int);
134
135 /*
136 * pchild - call queued by the SIGCHLD signal
137 * indicating that at least one child has terminated or stopped
138 * thus at least one wait system call will definitely return a
139 * childs status. Top level routines (like pwait) must be sure
140 * to mask interrupts when playing with the proclist data structures!
141 */
142 void
pchild(void)143 pchild(void)
144 {
145 struct process *pp;
146 struct process *fp;
147 pid_t pid;
148 #ifdef BSDWAIT
149 union wait w;
150 #else /* !BSDWAIT */
151 int w;
152 #endif /* !BSDWAIT */
153 int jobflags;
154 #ifdef BSDTIMES
155 struct sysrusage ru;
156 #else /* !BSDTIMES */
157 # ifdef _SEQUENT_
158 struct process_stats ru;
159 struct process_stats cpst1, cpst2;
160 timeval_t tv;
161 # else /* !_SEQUENT_ */
162 struct tms proctimes;
163
164 if (!timesdone) {
165 timesdone++;
166 (void) times(&shtimes);
167 }
168 # endif /* !_SEQUENT_ */
169 #endif /* !BSDTIMES */
170
171 jobdebug_xprintf(("pchild()\n"));
172
173 loop:
174 jobdebug_xprintf(("Waiting...\n"));
175 jobdebug_flush();
176 errno = 0; /* reset, just in case */
177
178 #ifndef WINNT_NATIVE
179 # ifdef BSDJOBS
180 # ifdef BSDTIMES
181 # ifdef convex
182 /* use 'cvxwait' to get parallel statistics */
183 pid = cvxwait(&w,
184 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru);
185 # else
186 /* both a wait3 and rusage */
187 # if !defined(BSDWAIT) || defined(NeXT) || defined(MACH) || defined(__linux__) || defined(__GNU__) || defined(__GLIBC__) || (defined(IRIS4D) && SYSVREL <= 3) || defined(__lucid) || defined(__osf__)
188 #ifdef __ANDROID__ /* no wait3, only wait4 */
189 pid = wait4(-1, &w,
190 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru);
191 #else
192 pid = wait3(&w,
193 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru);
194 #endif /* __ANDROID__ */
195 # else /* BSDWAIT */
196 pid = wait3(&w.w_status,
197 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru);
198 # endif /* BSDWAIT */
199 # endif /* convex */
200 # else /* !BSDTIMES */
201 # ifdef _SEQUENT_
202 (void) get_process_stats(&tv, PS_SELF, 0, &cpst1);
203 pid = waitpid(-1, &w,
204 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG));
205 (void) get_process_stats(&tv, PS_SELF, 0, &cpst2);
206 pr_stat_sub(&cpst2, &cpst1, &ru);
207 # else /* !_SEQUENT_ */
208 # ifndef POSIX
209 /* we have a wait3, but no rusage stuff */
210 pid = wait3(&w.w_status,
211 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), 0);
212 # else /* POSIX */
213 pid = waitpid(-1, &w,
214 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG));
215 # endif /* POSIX */
216 # endif /* !_SEQUENT_ */
217 # endif /* !BSDTIMES */
218 # else /* !BSDJOBS */
219 # ifdef BSDTIMES
220 # define HAVEwait3
221 /* both a wait3 and rusage */
222 # ifdef hpux
223 pid = wait3(&w.w_status, WNOHANG, 0);
224 # else /* !hpux */
225 # ifndef BSDWAIT
226 pid = wait3(&w, WNOHANG, &ru);
227 # else
228 pid = wait3(&w.w_status, WNOHANG, &ru);
229 # endif /* BSDWAIT */
230 # endif /* !hpux */
231 # else /* !BSDTIMES */
232 # ifdef ODT /* For Sco Unix 3.2.0 or ODT 1.0 */
233 # define HAVEwait3
234 pid = waitpid(-1, &w,
235 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG));
236 # endif /* ODT */
237 # if defined(aiws) || defined(uts)
238 # define HAVEwait3
239 pid = wait3(&w.w_status,
240 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), 0);
241 # endif /* aiws || uts */
242 # ifndef HAVEwait3
243 # ifndef BSDWAIT
244 /* no wait3, therefore no rusage */
245 /* on Sys V, this may hang. I hope it's not going to be a problem */
246 pid = wait(&w);
247 # else /* BSDWAIT */
248 /*
249 * XXX: for greater than 3 we should use waitpid().
250 * but then again, SVR4 falls into the POSIX/BSDJOBS category.
251 */
252 pid = wait(&w.w_status);
253 # endif /* BSDWAIT */
254 # endif /* !HAVEwait3 */
255 # endif /* !BSDTIMES */
256 # endif /* !BSDJOBS */
257 #else /* WINNT_NATIVE */
258 pid = waitpid(-1, &w,
259 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG));
260 #endif /* WINNT_NATIVE */
261
262 jobdebug_xprintf(("parent %d pid %d, retval %x termsig %x retcode %x\n",
263 (int)getpid(), (int)pid, w, WTERMSIG(w),
264 WEXITSTATUS(w)));
265 jobdebug_flush();
266
267 if ((pid == 0) || (pid == -1)) {
268 (void)handle_pending_signals();
269 jobdebug_xprintf(("errno == %d\n", errno));
270 if (errno == EINTR)
271 goto loop;
272 goto end;
273 }
274 for (pp = proclist.p_next; pp != NULL; pp = pp->p_next)
275 if (pid == pp->p_procid)
276 goto found;
277 #if !defined(BSDJOBS) && !defined(WINNT_NATIVE)
278 /* this should never have happened */
279 stderror(ERR_SYNC, pid);
280 xexit(0);
281 #else /* BSDJOBS || WINNT_NATIVE */
282 goto loop;
283 #endif /* !BSDJOBS && !WINNT_NATIVE */
284 found:
285 pp->p_flags &= ~(PRUNNING | PSTOPPED | PREPORTED);
286 if (WIFSTOPPED(w)) {
287 pp->p_flags |= PSTOPPED;
288 pp->p_reason = WSTOPSIG(w);
289 }
290 else {
291 if (pp->p_flags & (PTIME | PPTIME) || adrof(STRtime))
292 #ifndef BSDTIMES
293 # ifdef _SEQUENT_
294 (void) get_process_stats(&pp->p_etime, PS_SELF, NULL, NULL);
295 # else /* !_SEQUENT_ */
296 pp->p_etime = times(&proctimes);
297 # endif /* !_SEQUENT_ */
298 #else /* BSDTIMES */
299 (void) gettimeofday(&pp->p_etime, NULL);
300 #endif /* BSDTIMES */
301
302
303 #if defined(BSDTIMES) || defined(_SEQUENT_)
304 pp->p_rusage = ru;
305 #else /* !BSDTIMES && !_SEQUENT_ */
306 (void) times(&proctimes);
307 pp->p_utime = proctimes.tms_cutime - shtimes.tms_cutime;
308 pp->p_stime = proctimes.tms_cstime - shtimes.tms_cstime;
309 shtimes = proctimes;
310 #endif /* !BSDTIMES && !_SEQUENT_ */
311 if (WIFSIGNALED(w)) {
312 if (WTERMSIG(w) == SIGINT)
313 pp->p_flags |= PINTERRUPTED;
314 else
315 pp->p_flags |= PSIGNALED;
316 if (WCOREDUMP(w))
317 pp->p_flags |= PDUMPED;
318 pp->p_reason = WTERMSIG(w);
319 }
320 else {
321 pp->p_reason = WEXITSTATUS(w);
322 if (pp->p_reason != 0)
323 pp->p_flags |= PAEXITED;
324 else
325 pp->p_flags |= PNEXITED;
326 }
327 }
328 jobflags = 0;
329 fp = pp;
330 do {
331 if ((fp->p_flags & (PPTIME | PRUNNING | PSTOPPED)) == 0 &&
332 !child && adrof(STRtime) &&
333 #ifdef BSDTIMES
334 fp->p_rusage.ru_utime.tv_sec + fp->p_rusage.ru_stime.tv_sec
335 #else /* !BSDTIMES */
336 # ifdef _SEQUENT_
337 fp->p_rusage.ps_utime.tv_sec + fp->p_rusage.ps_stime.tv_sec
338 # else /* !_SEQUENT_ */
339 # ifndef POSIX
340 (fp->p_utime + fp->p_stime) / HZ
341 # else /* POSIX */
342 (fp->p_utime + fp->p_stime) / clk_tck
343 # endif /* POSIX */
344 # endif /* !_SEQUENT_ */
345 #endif /* !BSDTIMES */
346 >= atoi(short2str(varval(STRtime))))
347 fp->p_flags |= PTIME;
348 jobflags |= fp->p_flags;
349 } while ((fp = fp->p_friends) != pp);
350 pp->p_flags &= ~PFOREGND;
351 if (pp == pp->p_friends && (pp->p_flags & PPTIME)) {
352 pp->p_flags &= ~PPTIME;
353 pp->p_flags |= PTIME;
354 }
355 if ((jobflags & (PRUNNING | PREPORTED)) == 0) {
356 fp = pp;
357 do {
358 if (fp->p_flags & PSTOPPED)
359 fp->p_flags |= PREPORTED;
360 } while ((fp = fp->p_friends) != pp);
361 while (fp->p_procid != fp->p_jobid)
362 fp = fp->p_friends;
363 if (jobflags & PSTOPPED) {
364 if (pcurrent && pcurrent != fp)
365 pprevious = pcurrent;
366 pcurrent = fp;
367 }
368 else
369 pclrcurr(fp);
370 if (jobflags & PFOREGND) {
371 if (!(jobflags & (PSIGNALED | PSTOPPED | PPTIME) ||
372 #ifdef notdef
373 jobflags & PAEXITED ||
374 #endif /* notdef */
375 fp->p_cwd == NULL ||
376 !eq(dcwd->di_name, fp->p_cwd->di_name))) {
377 /* PWP: print a newline after ^C */
378 if (jobflags & PINTERRUPTED) {
379 xputchar('\r' | QUOTE);
380 xputchar('\n');
381 }
382 #ifdef notdef
383 else if ((jobflags & (PTIME|PSTOPPED)) == PTIME)
384 ptprint(fp);
385 #endif /* notdef */
386 }
387 }
388 else {
389 if (jobflags & PNOTIFY || adrof(STRnotify)) {
390 xputchar('\r' | QUOTE);
391 xputchar('\n');
392 (void) pprint(pp, NUMBER | NAME | REASON);
393 if ((jobflags & PSTOPPED) == 0)
394 pflush(pp);
395 if (GettingInput) {
396 errno = 0;
397 (void) Rawmode();
398 #ifdef notdef
399 /*
400 * don't really want to do that, because it
401 * will erase our message in case of multi-line
402 * input
403 */
404 ClearLines();
405 #endif /* notdef */
406 ClearDisp();
407 Refresh();
408 }
409 }
410 else {
411 fp->p_flags |= PNEEDNOTE;
412 neednote = 1;
413 }
414 }
415 }
416 #if defined(BSDJOBS) || defined(HAVEwait3) ||defined(WINNT_NATIVE)
417 goto loop;
418 #endif /* BSDJOBS || HAVEwait3 */
419 end:
420 ;
421 }
422
423 void
pnote(void)424 pnote(void)
425 {
426 struct process *pp;
427 int flags;
428
429 neednote = 0;
430 for (pp = proclist.p_next; pp != NULL; pp = pp->p_next) {
431 if (pp->p_flags & PNEEDNOTE) {
432 pchild_disabled++;
433 cleanup_push(&pchild_disabled, disabled_cleanup);
434 pp->p_flags &= ~PNEEDNOTE;
435 flags = pprint(pp, NUMBER | NAME | REASON);
436 if ((flags & (PRUNNING | PSTOPPED)) == 0)
437 pflush(pp);
438 cleanup_until(&pchild_disabled);
439 }
440 }
441 }
442
443
444 static void
pfree(struct process * pp)445 pfree(struct process *pp)
446 {
447 xfree(pp->p_command);
448 if (pp->p_cwd && --pp->p_cwd->di_count == 0)
449 if (pp->p_cwd->di_next == 0)
450 dfree(pp->p_cwd);
451 xfree(pp);
452 }
453
454
455 /*
456 * pwait - wait for current job to terminate, maintaining integrity
457 * of current and previous job indicators.
458 */
459 void
pwait(void)460 pwait(void)
461 {
462 struct process *fp, *pp;
463
464 /*
465 * Here's where dead procs get flushed.
466 */
467 for (pp = (fp = &proclist)->p_next; pp != NULL; pp = (fp = pp)->p_next)
468 if (pp->p_procid == 0) {
469 fp->p_next = pp->p_next;
470 pfree(pp);
471 pp = fp;
472 }
473 pjwait(pcurrjob);
474 }
475
476
477 /*
478 * pjwait - wait for a job to finish or become stopped
479 * It is assumed to be in the foreground state (PFOREGND)
480 */
481 void
pjwait(struct process * pp)482 pjwait(struct process *pp)
483 {
484 struct process *fp;
485 int jobflags, reason;
486 sigset_t oset, set, pause_mask;
487 Char *reason_str;
488
489 while (pp->p_procid != pp->p_jobid)
490 pp = pp->p_friends;
491 fp = pp;
492
493 do {
494 if ((fp->p_flags & (PFOREGND | PRUNNING)) == PRUNNING)
495 xprintf("%s", CGETS(17, 1, "BUG: waiting for background job!\n"));
496 } while ((fp = fp->p_friends) != pp);
497 /*
498 * Now keep pausing as long as we are not interrupted (SIGINT), and the
499 * target process, or any of its friends, are running
500 */
501 fp = pp;
502 sigemptyset(&set);
503 sigaddset(&set, SIGINT);
504 sigaddset(&set, SIGCHLD);
505 (void)sigprocmask(SIG_BLOCK, &set, &oset);
506 cleanup_push(&oset, sigprocmask_cleanup);
507 pause_mask = oset;
508 sigdelset(&pause_mask, SIGCHLD);
509 sigaddset(&pause_mask, SIGINT);
510 for (;;) {
511 (void)handle_pending_signals();
512 jobflags = 0;
513 do
514 jobflags |= fp->p_flags;
515 while ((fp = (fp->p_friends)) != pp);
516 if ((jobflags & PRUNNING) == 0)
517 break;
518 jobdebug_xprintf(("%d starting to sigsuspend for SIGCHLD on %d\n",
519 getpid(), fp->p_procid));
520 sigsuspend(&pause_mask);
521 }
522 cleanup_until(&oset);
523 jobdebug_xprintf(("%d returned from sigsuspend loop\n", getpid()));
524 #ifdef BSDJOBS
525 if (tpgrp > 0) /* get tty back */
526 (void) tcsetpgrp(FSHTTY, tpgrp);
527 #endif /* BSDJOBS */
528 if ((jobflags & (PSIGNALED | PSTOPPED | PTIME)) ||
529 fp->p_cwd == NULL || !eq(dcwd->di_name, fp->p_cwd->di_name)) {
530 if (jobflags & PSTOPPED) {
531 xputchar('\n');
532 if (adrof(STRlistjobs)) {
533 Char *jobcommand[3];
534
535 jobcommand[0] = STRjobs;
536 if (eq(varval(STRlistjobs), STRlong))
537 jobcommand[1] = STRml;
538 else
539 jobcommand[1] = NULL;
540 jobcommand[2] = NULL;
541
542 dojobs(jobcommand, NULL);
543 (void) pprint(pp, SHELLDIR);
544 }
545 else
546 (void) pprint(pp, AREASON | SHELLDIR);
547 }
548 else
549 (void) pprint(pp, AREASON | SHELLDIR);
550 }
551 if ((jobflags & (PINTERRUPTED | PSTOPPED)) && setintr &&
552 (!gointr || !eq(gointr, STRminus))) {
553 if ((jobflags & PSTOPPED) == 0)
554 pflush(pp);
555 pintr1(0);
556 /* NOTREACHED */
557 }
558 reason = 0;
559 fp = pp;
560 do {
561 /* In case of pipelines only the result of the last
562 * command should be taken in account */
563 if (!anyerror && !(fp->p_flags & PBRACE)
564 && ((fp->p_flags & PPOU) || (fp->p_flags & PBACKQ)))
565 continue;
566 if (fp->p_reason)
567 reason = fp->p_flags & (PSIGNALED | PINTERRUPTED) ?
568 fp->p_reason | META : fp->p_reason;
569 } while ((fp = fp->p_friends) != pp);
570 /*
571 * Don't report on backquoted jobs, cause it will mess up
572 * their output.
573 */
574 if ((reason != 0) && (adrof(STRprintexitvalue)) &&
575 (pp->p_flags & PBACKQ) == 0)
576 xprintf(CGETS(17, 2, "Exit %d\n"), reason);
577 reason_str = putn((tcsh_number_t)reason);
578 cleanup_push(reason_str, xfree);
579 setv(STRstatus, reason_str, VAR_READWRITE);
580 cleanup_ignore(reason_str);
581 cleanup_until(reason_str);
582 if (reason && exiterr)
583 exitstat();
584 pflush(pp);
585 }
586
587 /*
588 * dowait - wait for all processes to finish
589 */
590
591 /*ARGSUSED*/
592 void
dowait(Char ** v,struct command * c)593 dowait(Char **v, struct command *c)
594 {
595 struct process *pp;
596
597 /* the current block mask to be able to restore */
598 sigset_t old_mask;
599
600 /* block mask for critical section: OLD_MASK U {SIGCHLD} */
601 sigset_t block_mask;
602
603 /* ignore those during blocking sigsuspend:
604 OLD_MASK / {SIGCHLD, possibly(SIGINT)} */
605 sigset_t pause_mask;
606
607 int opintr_disabled, gotsig;
608
609 USE(c);
610 USE(v);
611 pjobs++;
612
613 sigprocmask(SIG_BLOCK, NULL, &pause_mask);
614 sigdelset(&pause_mask, SIGCHLD);
615 if (setintr)
616 sigdelset(&pause_mask, SIGINT);
617
618 /* critical section, block also SIGCHLD */
619 sigprocmask(SIG_BLOCK, NULL, &block_mask);
620 sigaddset(&block_mask, SIGCHLD);
621 sigprocmask(SIG_BLOCK, &block_mask, &old_mask);
622
623 /* detect older SIGCHLDs and remove PRUNNING flag from proclist */
624 (void)handle_pending_signals();
625
626 loop:
627 for (pp = proclist.p_next; pp; pp = pp->p_next)
628 if (pp->p_procid && /* pp->p_procid == pp->p_jobid && */
629 pp->p_flags & PRUNNING) {
630 /* wait for (or pick up alredy blocked) SIGCHLD */
631 sigsuspend(&pause_mask);
632
633 /* make the 'wait' interuptable by CTRL-C */
634 opintr_disabled = pintr_disabled;
635 pintr_disabled = 0;
636 gotsig = handle_pending_signals();
637 pintr_disabled = opintr_disabled;
638 if (gotsig)
639 break;
640 goto loop;
641 }
642 pjobs = 0;
643
644 sigprocmask(SIG_SETMASK, &old_mask, NULL);
645 }
646
647 /*
648 * pflushall - flush all jobs from list (e.g. at fork())
649 */
650 static void
pflushall(void)651 pflushall(void)
652 {
653 struct process *pp;
654
655 for (pp = proclist.p_next; pp != NULL; pp = pp->p_next)
656 if (pp->p_procid)
657 pflush(pp);
658 }
659
660 /*
661 * pflush - flag all process structures in the same job as the
662 * the argument process for deletion. The actual free of the
663 * space is not done here since pflush is called at interrupt level.
664 */
665 static void
pflush(struct process * pp)666 pflush(struct process *pp)
667 {
668 struct process *np;
669 int idx;
670
671 if (pp->p_procid == 0) {
672 xprintf("%s", CGETS(17, 3, "BUG: process flushed twice"));
673 return;
674 }
675 while (pp->p_procid != pp->p_jobid)
676 pp = pp->p_friends;
677 pclrcurr(pp);
678 if (pp == pcurrjob)
679 pcurrjob = 0;
680 idx = pp->p_index;
681 np = pp;
682 do {
683 np->p_index = np->p_procid = 0;
684 np->p_flags &= ~PNEEDNOTE;
685 } while ((np = np->p_friends) != pp);
686 if (idx == pmaxindex) {
687 for (np = proclist.p_next, idx = 0; np; np = np->p_next)
688 if (np->p_index > idx)
689 idx = np->p_index;
690 pmaxindex = idx;
691 }
692 }
693
694 /*
695 * pclrcurr - make sure the given job is not the current or previous job;
696 * pp MUST be the job leader
697 */
698 static void
pclrcurr(struct process * pp)699 pclrcurr(struct process *pp)
700 {
701 if (pp == pcurrent) {
702 if (pprevious != NULL) {
703 pcurrent = pprevious;
704 pprevious = pgetcurr(pp);
705 }
706 else {
707 pcurrent = pgetcurr(pp);
708 pprevious = pgetcurr(pp);
709 }
710 }
711 else if (pp == pprevious)
712 pprevious = pgetcurr(pp);
713 }
714
715 /* +4 here is 1 for '\0', 1 ea for << >& >> */
716 static Char *cmdstr;
717 static size_t cmdmax;
718 static size_t cmdlen;
719 static Char *cmdp;
720 #define CMD_INIT 1024
721 #define CMD_INCR 64
722
723 static void
morecommand(size_t s)724 morecommand(size_t s)
725 {
726 Char *ncmdstr;
727 ptrdiff_t d;
728
729 cmdmax += s;
730 ncmdstr = xrealloc(cmdstr, cmdmax * sizeof(*cmdstr));
731 d = ncmdstr - cmdstr;
732 cmdstr = ncmdstr;
733 cmdp += d;
734 }
735
736 /* GrP
737 * unparse - Export padd() functionality
738 */
739 Char *
unparse(struct command * t)740 unparse(struct command *t)
741 {
742 if (cmdmax == 0)
743 morecommand(CMD_INIT);
744 cmdp = cmdstr;
745 cmdlen = 0;
746 padd(t);
747 *cmdp++ = '\0';
748 return Strsave(cmdstr);
749 }
750
751
752 /*
753 * palloc - allocate a process structure and fill it up.
754 * an important assumption is made that the process is running.
755 */
756 void
palloc(pid_t pid,struct command * t)757 palloc(pid_t pid, struct command *t)
758 {
759 struct process *pp;
760 int i;
761
762 pp = xcalloc(1, sizeof(struct process));
763 pp->p_procid = pid;
764 pp->p_parentid = shpgrp;
765 pp->p_flags = ((t->t_dflg & F_AMPERSAND) ? 0 : PFOREGND) | PRUNNING;
766 if (t->t_dflg & F_TIME)
767 pp->p_flags |= PPTIME;
768 if (t->t_dflg & F_BACKQ)
769 pp->p_flags |= PBACKQ;
770 if (t->t_dflg & F_HUP)
771 pp->p_flags |= PHUP;
772 if (t->t_dcom && t->t_dcom[0] && (*t->t_dcom[0] == '{'))
773 pp->p_flags |= PBRACE;
774 if (cmdmax == 0)
775 morecommand(CMD_INIT);
776 cmdp = cmdstr;
777 cmdlen = 0;
778 padd(t);
779 *cmdp++ = 0;
780 if (t->t_dflg & F_PIPEOUT) {
781 pp->p_flags |= PPOU;
782 if (t->t_dflg & F_STDERR)
783 pp->p_flags |= PDIAG;
784 }
785 pp->p_command = Strsave(cmdstr);
786 if (pcurrjob) {
787 struct process *fp;
788
789 /* careful here with interrupt level */
790 pp->p_cwd = 0;
791 pp->p_index = pcurrjob->p_index;
792 pp->p_friends = pcurrjob;
793 pp->p_jobid = pcurrjob->p_procid;
794 for (fp = pcurrjob; fp->p_friends != pcurrjob; fp = fp->p_friends)
795 continue;
796 fp->p_friends = pp;
797 }
798 else {
799 pcurrjob = pp;
800 pp->p_jobid = pid;
801 pp->p_friends = pp;
802 pp->p_cwd = dcwd;
803 dcwd->di_count++;
804 if (pmaxindex < BIGINDEX)
805 pp->p_index = ++pmaxindex;
806 else {
807 struct process *np;
808
809 for (i = 1;; i++) {
810 for (np = proclist.p_next; np; np = np->p_next)
811 if (np->p_index == i)
812 goto tryagain;
813 pp->p_index = i;
814 if (i > pmaxindex)
815 pmaxindex = i;
816 break;
817 tryagain:;
818 }
819 }
820 if (pcurrent == NULL)
821 pcurrent = pp;
822 else if (pprevious == NULL)
823 pprevious = pp;
824 }
825 pp->p_next = proclist.p_next;
826 proclist.p_next = pp;
827 #ifdef BSDTIMES
828 (void) gettimeofday(&pp->p_btime, NULL);
829 #else /* !BSDTIMES */
830 # ifdef _SEQUENT_
831 (void) get_process_stats(&pp->p_btime, PS_SELF, NULL, NULL);
832 # else /* !_SEQUENT_ */
833 {
834 struct tms tmptimes;
835
836 pp->p_btime = times(&tmptimes);
837 }
838 # endif /* !_SEQUENT_ */
839 #endif /* !BSDTIMES */
840 }
841
842 static void
padd(struct command * t)843 padd(struct command *t)
844 {
845 Char **argp;
846
847 if (t == 0)
848 return;
849 switch (t->t_dtyp) {
850
851 case NODE_PAREN:
852 pads(STRLparensp);
853 padd(t->t_dspr);
854 pads(STRspRparen);
855 break;
856
857 case NODE_COMMAND:
858 for (argp = t->t_dcom; *argp; argp++) {
859 pads(*argp);
860 if (argp[1])
861 pads(STRspace);
862 }
863 break;
864
865 case NODE_OR:
866 case NODE_AND:
867 case NODE_PIPE:
868 case NODE_LIST:
869 padd(t->t_dcar);
870 switch (t->t_dtyp) {
871 case NODE_OR:
872 pads(STRspor2sp);
873 break;
874 case NODE_AND:
875 pads(STRspand2sp);
876 break;
877 case NODE_PIPE:
878 pads(STRsporsp);
879 break;
880 case NODE_LIST:
881 pads(STRsemisp);
882 break;
883 default:
884 break;
885 }
886 padd(t->t_dcdr);
887 return;
888
889 default:
890 break;
891 }
892 if ((t->t_dflg & F_PIPEIN) == 0 && t->t_dlef) {
893 pads((t->t_dflg & F_READ) ? STRspLarrow2sp : STRspLarrowsp);
894 pads(t->t_dlef);
895 }
896 if ((t->t_dflg & F_PIPEOUT) == 0 && t->t_drit) {
897 pads((t->t_dflg & F_APPEND) ? STRspRarrow2 : STRspRarrow);
898 if (t->t_dflg & F_STDERR)
899 pads(STRand);
900 pads(STRspace);
901 pads(t->t_drit);
902 }
903 }
904
905 static void
pads(Char * cp)906 pads(Char *cp)
907 {
908 size_t i, len;
909
910 /*
911 * Avoid the Quoted Space alias hack! Reported by:
912 * sam@john-bigboote.ICS.UCI.EDU (Sam Horrocks)
913 */
914 if (cp[0] == STRQNULL[0])
915 cp++;
916
917 i = Strlen(cp);
918
919 len = cmdlen + i + CMD_INCR;
920 if (len >= cmdmax)
921 morecommand(len);
922 (void) Strcpy(cmdp, cp);
923 cmdp += i;
924 cmdlen += i;
925 }
926
927 /*
928 * psavejob - temporarily save the current job on a one level stack
929 * so another job can be created. Used for { } in exp6
930 * and `` in globbing.
931 */
932 void
psavejob(void)933 psavejob(void)
934 {
935 pholdjob = pcurrjob;
936 pcurrjob = NULL;
937 }
938
939 void
psavejob_cleanup(void * dummy)940 psavejob_cleanup(void *dummy)
941 {
942 USE(dummy);
943 pcurrjob = pholdjob;
944 pholdjob = NULL;
945 }
946
947 /*
948 * pendjob - indicate that a job (set of commands) has been completed
949 * or is about to begin.
950 */
951 void
pendjob(void)952 pendjob(void)
953 {
954 struct process *pp, *tp;
955
956 if (pcurrjob && (pcurrjob->p_flags & (PFOREGND | PSTOPPED)) == 0) {
957 pp = pcurrjob;
958 pcurrjob = NULL;
959 while (pp->p_procid != pp->p_jobid)
960 pp = pp->p_friends;
961 xprintf("[%d]", pp->p_index);
962 tp = pp;
963 do {
964 xprintf(" %d", pp->p_procid);
965 pp = pp->p_friends;
966 } while (pp != tp);
967 xputchar('\n');
968 }
969 pholdjob = pcurrjob = 0;
970 }
971
972 /*
973 * pprint - print a job
974 */
975
976 /*
977 * Hacks have been added for SVR4 to deal with pipe's being spawned in
978 * reverse order
979 *
980 * David Dawes (dawes@physics.su.oz.au) Oct 1991
981 */
982
983 static int
pprint(struct process * pp,int flag)984 pprint(struct process *pp, int flag)
985 {
986 int status, reason;
987 struct process *tp;
988 int jobflags, pstatus, pcond;
989 const char *format;
990 int ohaderr;
991
992 #ifdef BACKPIPE
993 struct process *pipehead = NULL, *pipetail = NULL, *pmarker = NULL;
994 int inpipe = 0;
995 #endif /* BACKPIPE */
996
997 while (pp->p_procid != pp->p_jobid)
998 pp = pp->p_friends;
999 if (pp == pp->p_friends && (pp->p_flags & PPTIME)) {
1000 pp->p_flags &= ~PPTIME;
1001 pp->p_flags |= PTIME;
1002 }
1003 tp = pp;
1004 status = reason = -1;
1005 jobflags = 0;
1006 ohaderr = haderr;
1007 /* Print status to stderr, except for jobs built-in */
1008 haderr = !(flag & JOBLIST);
1009 do {
1010 #ifdef BACKPIPE
1011 /*
1012 * The pipeline is reversed, so locate the real head of the pipeline
1013 * if pp is at the tail of a pipe (and not already in a pipeline)
1014 */
1015 if ((pp->p_friends->p_flags & PPOU) && !inpipe && (flag & NAME)) {
1016 inpipe = 1;
1017 pipetail = pp;
1018 do
1019 pp = pp->p_friends;
1020 while (pp->p_friends->p_flags & PPOU);
1021 pipehead = pp;
1022 pmarker = pp;
1023 /*
1024 * pmarker is used to hold the place of the proc being processed, so
1025 * we can search for the next one downstream later.
1026 */
1027 }
1028 pcond = (tp != pp || (inpipe && tp == pp));
1029 #else /* !BACKPIPE */
1030 pcond = (tp != pp);
1031 #endif /* BACKPIPE */
1032
1033 jobflags |= pp->p_flags;
1034 pstatus = (int) (pp->p_flags & PALLSTATES);
1035 if (pcond && linp != linbuf && !(flag & FANCY) &&
1036 ((pstatus == status && pp->p_reason == reason) ||
1037 !(flag & REASON)))
1038 xputchar(' ');
1039 else {
1040 if (pcond && linp != linbuf)
1041 xputchar('\n');
1042 if (flag & NUMBER) {
1043 #ifdef BACKPIPE
1044 pcond = ((pp == tp && !inpipe) ||
1045 (inpipe && pipetail == tp && pp == pipehead));
1046 #else /* BACKPIPE */
1047 pcond = (pp == tp);
1048 #endif /* BACKPIPE */
1049 if (pcond)
1050 xprintf("[%d]%s %c ", pp->p_index,
1051 pp->p_index < 10 ? " " : "",
1052 pp == pcurrent ? '+' :
1053 (pp == pprevious ? '-' : ' '));
1054 else
1055 xprintf(" ");
1056 }
1057 if (flag & FANCY) {
1058 xprintf("%5d ", pp->p_procid);
1059 #ifdef TCF
1060 xprintf("%11s ", sitename(pp->p_procid));
1061 #endif /* TCF */
1062 }
1063 if (flag & (REASON | AREASON)) {
1064 if (flag & NAME)
1065 format = "%-30s";
1066 else
1067 format = "%s";
1068 if (pstatus == status) {
1069 if (pp->p_reason == reason) {
1070 xprintf(format, "");
1071 goto prcomd;
1072 }
1073 else
1074 reason = (int) pp->p_reason;
1075 }
1076 else {
1077 status = pstatus;
1078 reason = (int) pp->p_reason;
1079 }
1080 switch (status) {
1081
1082 case PRUNNING:
1083 xprintf(format, CGETS(17, 4, "Running "));
1084 break;
1085
1086 case PINTERRUPTED:
1087 case PSTOPPED:
1088 case PSIGNALED:
1089 /*
1090 * tell what happened to the background job
1091 * From: Michael Schroeder
1092 * <mlschroe@immd4.informatik.uni-erlangen.de>
1093 */
1094 if ((flag & REASON)
1095 || ((flag & AREASON)
1096 && reason != SIGINT
1097 && (reason != SIGPIPE
1098 || (pp->p_flags & PPOU) == 0))) {
1099 char *ptr;
1100 int free_ptr;
1101
1102 free_ptr = 0;
1103 ptr = (char *)(intptr_t)mesg[pp->p_reason & 0177].pname;
1104 if (ptr == NULL) {
1105 ptr = xasprintf("%s %d", CGETS(17, 5, "Signal"),
1106 pp->p_reason & 0177);
1107 cleanup_push(ptr, xfree);
1108 free_ptr = 1;
1109 }
1110 xprintf(format, ptr);
1111 if (free_ptr != 0)
1112 cleanup_until(ptr);
1113 }
1114 else
1115 reason = -1;
1116 break;
1117
1118 case PNEXITED:
1119 case PAEXITED:
1120 if (flag & REASON) {
1121 if (pp->p_reason)
1122 xprintf(CGETS(17, 6, "Exit %-25d"), pp->p_reason);
1123 else
1124 xprintf(format, CGETS(17, 7, "Done"));
1125 }
1126 break;
1127
1128 default:
1129 xprintf(CGETS(17, 8, "BUG: status=%-9o"),
1130 status);
1131 }
1132 }
1133 }
1134 prcomd:
1135 if (flag & NAME) {
1136 xprintf("%S", pp->p_command);
1137 if (pp->p_flags & PPOU)
1138 xprintf(" |");
1139 if (pp->p_flags & PDIAG)
1140 xprintf("&");
1141 }
1142 if (flag & (REASON | AREASON) && pp->p_flags & PDUMPED)
1143 xprintf("%s", CGETS(17, 9, " (core dumped)"));
1144 if (tp == pp->p_friends) {
1145 if (flag & AMPERSAND)
1146 xprintf(" &");
1147 if (flag & JOBDIR &&
1148 !eq(tp->p_cwd->di_name, dcwd->di_name)) {
1149 xprintf("%s", CGETS(17, 10, " (wd: "));
1150 dtildepr(tp->p_cwd->di_name);
1151 xprintf(")");
1152 }
1153 }
1154 if (pp->p_flags & PPTIME && !(status & (PSTOPPED | PRUNNING))) {
1155 if (linp != linbuf)
1156 xprintf("\n\t");
1157 #if defined(BSDTIMES) || defined(_SEQUENT_)
1158 prusage(&zru, &pp->p_rusage, &pp->p_etime,
1159 &pp->p_btime);
1160 #else /* !BSDTIMES && !SEQUENT */
1161 lru.tms_utime = pp->p_utime;
1162 lru.tms_stime = pp->p_stime;
1163 lru.tms_cutime = 0;
1164 lru.tms_cstime = 0;
1165 prusage(&zru, &lru, pp->p_etime,
1166 pp->p_btime);
1167 #endif /* !BSDTIMES && !SEQUENT */
1168
1169 }
1170 #ifdef BACKPIPE
1171 pcond = ((tp == pp->p_friends && !inpipe) ||
1172 (inpipe && pipehead->p_friends == tp && pp == pipetail));
1173 #else /* !BACKPIPE */
1174 pcond = (tp == pp->p_friends);
1175 #endif /* BACKPIPE */
1176 if (pcond) {
1177 if (linp != linbuf)
1178 xputchar('\n');
1179 if (flag & SHELLDIR && !eq(tp->p_cwd->di_name, dcwd->di_name)) {
1180 xprintf("%s", CGETS(17, 11, "(wd now: "));
1181 dtildepr(dcwd->di_name);
1182 xprintf(")\n");
1183 }
1184 }
1185 #ifdef BACKPIPE
1186 if (inpipe) {
1187 /*
1188 * if pmaker == pipetail, we are finished that pipeline, and
1189 * can now skip to past the head
1190 */
1191 if (pmarker == pipetail) {
1192 inpipe = 0;
1193 pp = pipehead;
1194 }
1195 else {
1196 /*
1197 * set pp to one before the one we want next, so the while below
1198 * increments to the correct spot.
1199 */
1200 do
1201 pp = pp->p_friends;
1202 while (pp->p_friends->p_friends != pmarker);
1203 pmarker = pp->p_friends;
1204 }
1205 }
1206 pcond = ((pp = pp->p_friends) != tp || inpipe);
1207 #else /* !BACKPIPE */
1208 pcond = ((pp = pp->p_friends) != tp);
1209 #endif /* BACKPIPE */
1210 } while (pcond);
1211
1212 if (jobflags & PTIME && (jobflags & (PSTOPPED | PRUNNING)) == 0) {
1213 if (jobflags & NUMBER)
1214 xprintf(" ");
1215 ptprint(tp);
1216 }
1217 haderr = ohaderr;
1218 return (jobflags);
1219 }
1220
1221 /*
1222 * All 4.3 BSD derived implementations are buggy and I've had enough.
1223 * The following implementation produces similar code and works in all
1224 * cases. The 4.3BSD one works only for <, >, !=
1225 */
1226 # undef timercmp
1227 # define timercmp(tvp, uvp, cmp) \
1228 (((tvp)->tv_sec == (uvp)->tv_sec) ? \
1229 ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
1230 ((tvp)->tv_sec cmp (uvp)->tv_sec))
1231
1232 static void
ptprint(struct process * tp)1233 ptprint(struct process *tp)
1234 {
1235 #ifdef BSDTIMES
1236 struct timeval tetime, diff;
1237 static struct timeval ztime;
1238 struct sysrusage ru;
1239 struct process *pp = tp;
1240
1241 ru = zru;
1242 tetime = ztime;
1243 do {
1244 ruadd(&ru, &pp->p_rusage);
1245 tvsub(&diff, &pp->p_etime, &pp->p_btime);
1246 if (timercmp(&diff, &tetime, >))
1247 tetime = diff;
1248 } while ((pp = pp->p_friends) != tp);
1249 prusage(&zru, &ru, &tetime, &ztime);
1250 #else /* !BSDTIMES */
1251 # ifdef _SEQUENT_
1252 timeval_t tetime, diff;
1253 static timeval_t ztime;
1254 struct process_stats ru;
1255 struct process *pp = tp;
1256
1257 ru = zru;
1258 tetime = ztime;
1259 do {
1260 ruadd(&ru, &pp->p_rusage);
1261 tvsub(&diff, &pp->p_etime, &pp->p_btime);
1262 if (timercmp(&diff, &tetime, >))
1263 tetime = diff;
1264 } while ((pp = pp->p_friends) != tp);
1265 prusage(&zru, &ru, &tetime, &ztime);
1266 # else /* !_SEQUENT_ */
1267 # ifndef POSIX
1268 static time_t ztime = 0;
1269 static time_t zu_time = 0;
1270 static time_t zs_time = 0;
1271 time_t tetime, diff;
1272 time_t u_time, s_time;
1273
1274 # else /* POSIX */
1275 static clock_t ztime = 0;
1276 static clock_t zu_time = 0;
1277 static clock_t zs_time = 0;
1278 clock_t tetime, diff;
1279 clock_t u_time, s_time;
1280
1281 # endif /* POSIX */
1282 struct tms zts, rts;
1283 struct process *pp = tp;
1284
1285 u_time = zu_time;
1286 s_time = zs_time;
1287 tetime = ztime;
1288 do {
1289 u_time += pp->p_utime;
1290 s_time += pp->p_stime;
1291 diff = pp->p_etime - pp->p_btime;
1292 if (diff > tetime)
1293 tetime = diff;
1294 } while ((pp = pp->p_friends) != tp);
1295 zts.tms_utime = zu_time;
1296 zts.tms_stime = zs_time;
1297 zts.tms_cutime = 0;
1298 zts.tms_cstime = 0;
1299 rts.tms_utime = u_time;
1300 rts.tms_stime = s_time;
1301 rts.tms_cutime = 0;
1302 rts.tms_cstime = 0;
1303 prusage(&zts, &rts, tetime, ztime);
1304 # endif /* !_SEQUENT_ */
1305 #endif /* !BSDTIMES */
1306 }
1307
1308 /*
1309 * dojobs - print all jobs
1310 */
1311 /*ARGSUSED*/
1312 void
dojobs(Char ** v,struct command * c)1313 dojobs(Char **v, struct command *c)
1314 {
1315 struct process *pp;
1316 int flag = NUMBER | NAME | REASON | JOBLIST;
1317 int i;
1318
1319 USE(c);
1320 if (chkstop)
1321 chkstop = 2;
1322 if (*++v) {
1323 if (v[1] || !eq(*v, STRml))
1324 stderror(ERR_JOBS);
1325 flag |= FANCY | JOBDIR;
1326 }
1327 for (i = 1; i <= pmaxindex; i++)
1328 for (pp = proclist.p_next; pp; pp = pp->p_next)
1329 if (pp->p_index == i && pp->p_procid == pp->p_jobid) {
1330 pp->p_flags &= ~PNEEDNOTE;
1331 if (!(pprint(pp, flag) & (PRUNNING | PSTOPPED)))
1332 pflush(pp);
1333 break;
1334 }
1335 }
1336
1337 /*
1338 * dofg - builtin - put the job into the foreground
1339 */
1340 /*ARGSUSED*/
1341 void
dofg(Char ** v,struct command * c)1342 dofg(Char **v, struct command *c)
1343 {
1344 struct process *pp;
1345
1346 USE(c);
1347 okpcntl();
1348 ++v;
1349 do {
1350 pp = pfind(*v);
1351 if (!pstart(pp, 1)) {
1352 pp->p_procid = 0;
1353 stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno));
1354 continue;
1355 }
1356 pjwait(pp);
1357 } while (*v && *++v);
1358 }
1359
1360 /*
1361 * %... - builtin - put the job into the foreground
1362 */
1363 /*ARGSUSED*/
1364 void
dofg1(Char ** v,struct command * c)1365 dofg1(Char **v, struct command *c)
1366 {
1367 struct process *pp;
1368
1369 USE(c);
1370 okpcntl();
1371 pp = pfind(v[0]);
1372 if (!pstart(pp, 1)) {
1373 pp->p_procid = 0;
1374 stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno));
1375 return;
1376 }
1377 pjwait(pp);
1378 }
1379
1380 /*
1381 * dobg - builtin - put the job into the background
1382 */
1383 /*ARGSUSED*/
1384 void
dobg(Char ** v,struct command * c)1385 dobg(Char **v, struct command *c)
1386 {
1387 struct process *pp;
1388
1389 USE(c);
1390 okpcntl();
1391 ++v;
1392 do {
1393 pp = pfind(*v);
1394 if (!pstart(pp, 0)) {
1395 pp->p_procid = 0;
1396 stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno));
1397 }
1398 } while (*v && *++v);
1399 }
1400
1401 /*
1402 * %... & - builtin - put the job into the background
1403 */
1404 /*ARGSUSED*/
1405 void
dobg1(Char ** v,struct command * c)1406 dobg1(Char **v, struct command *c)
1407 {
1408 struct process *pp;
1409
1410 USE(c);
1411 pp = pfind(v[0]);
1412 if (!pstart(pp, 0)) {
1413 pp->p_procid = 0;
1414 stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno));
1415 }
1416 }
1417
1418 /*
1419 * dostop - builtin - stop the job
1420 */
1421 /*ARGSUSED*/
1422 void
dostop(Char ** v,struct command * c)1423 dostop(Char **v, struct command *c)
1424 {
1425 USE(c);
1426 #ifdef BSDJOBS
1427 pkill(++v, SIGSTOP);
1428 #endif /* BSDJOBS */
1429 }
1430
1431 /*
1432 * dokill - builtin - superset of kill (1)
1433 */
1434 /*ARGSUSED*/
1435 void
dokill(Char ** v,struct command * c)1436 dokill(Char **v, struct command *c)
1437 {
1438 int signum, len = 0;
1439 const char *name;
1440 Char *sigptr;
1441
1442 USE(c);
1443 v++;
1444 if (v[0] && v[0][0] == '-') {
1445 if (v[0][1] == 'l') {
1446 for (signum = 0; signum <= nsig; signum++) {
1447 if ((name = mesg[signum].iname) != NULL) {
1448 len += strlen(name) + 1;
1449 if (len >= TermH - 1) {
1450 xputchar('\n');
1451 len = strlen(name) + 1;
1452 }
1453 xprintf("%s ", name);
1454 }
1455 }
1456 xputchar('\n');
1457 return;
1458 }
1459 sigptr = &v[0][1];
1460 if (v[0][1] == 's') {
1461 if (v[1]) {
1462 v++;
1463 sigptr = &v[0][0];
1464 } else {
1465 stderror(ERR_NAME | ERR_TOOFEW);
1466 }
1467 }
1468 if (Isdigit(*sigptr)) {
1469 char *ep;
1470 signum = strtoul(short2str(sigptr), &ep, 0);
1471 if (*ep || signum < 0 || signum > (MAXSIG-1))
1472 stderror(ERR_NAME | ERR_BADSIG);
1473 }
1474 else {
1475 for (signum = 0; signum <= nsig; signum++)
1476 if (mesg[signum].iname &&
1477 eq(sigptr, str2short(mesg[signum].iname)))
1478 goto gotsig;
1479 setname(short2str(sigptr));
1480 stderror(ERR_NAME | ERR_UNKSIG);
1481 }
1482 gotsig:
1483 v++;
1484 }
1485 else
1486 signum = SIGTERM;
1487 pkill(v, signum);
1488 }
1489
1490 static void
pkill(Char ** v,int signum)1491 pkill(Char **v, int signum)
1492 {
1493 struct process *pp, *np;
1494 int jobflags = 0, err1 = 0;
1495 pid_t pid;
1496 Char *cp, **vp, **globbed;
1497
1498 /* Avoid globbing %?x patterns */
1499 for (vp = v; vp && *vp; vp++)
1500 if (**vp == '%')
1501 (void) quote(*vp);
1502
1503 v = glob_all_or_error(v);
1504 globbed = v;
1505 cleanup_push(globbed, blk_cleanup);
1506
1507 pchild_disabled++;
1508 cleanup_push(&pchild_disabled, disabled_cleanup);
1509 if (setintr) {
1510 pintr_disabled++;
1511 cleanup_push(&pintr_disabled, disabled_cleanup);
1512 }
1513
1514 while (v && (cp = *v)) {
1515 if (*cp == '%') {
1516 np = pp = pfind(cp);
1517 do
1518 jobflags |= np->p_flags;
1519 while ((np = np->p_friends) != pp);
1520 #ifdef BSDJOBS
1521 switch (signum) {
1522
1523 case SIGSTOP:
1524 case SIGTSTP:
1525 case SIGTTIN:
1526 case SIGTTOU:
1527 if ((jobflags & PRUNNING) == 0) {
1528 # ifdef SUSPENDED
1529 xprintf(CGETS(17, 12, "%S: Already suspended\n"), cp);
1530 # else /* !SUSPENDED */
1531 xprintf(CGETS(17, 13, "%S: Already stopped\n"), cp);
1532 # endif /* !SUSPENDED */
1533 err1++;
1534 goto cont;
1535 }
1536 break;
1537 /*
1538 * suspend a process, kill -CONT %, then type jobs; the shell
1539 * says it is suspended, but it is running; thanks jaap..
1540 */
1541 case SIGCONT:
1542 if (!pstart(pp, 0)) {
1543 pp->p_procid = 0;
1544 stderror(ERR_NAME|ERR_BADJOB, pp->p_command,
1545 strerror(errno));
1546 }
1547 goto cont;
1548 default:
1549 break;
1550 }
1551 #endif /* BSDJOBS */
1552 if (killpg(pp->p_jobid, signum) < 0) {
1553 xprintf("%S: %s\n", cp, strerror(errno));
1554 err1++;
1555 }
1556 #ifdef BSDJOBS
1557 if (signum == SIGTERM || signum == SIGHUP)
1558 (void) killpg(pp->p_jobid, SIGCONT);
1559 #endif /* BSDJOBS */
1560 }
1561 else if (!(Isdigit(*cp) || *cp == '-'))
1562 stderror(ERR_NAME | ERR_JOBARGS);
1563 else {
1564 char *ep;
1565 #ifndef WINNT_NATIVE
1566 pid = strtol(short2str(cp), &ep, 10);
1567 #else
1568 pid = strtoul(short2str(cp), &ep, 0);
1569 #endif /* WINNT_NATIVE */
1570 if (*ep)
1571 stderror(ERR_NAME | ERR_JOBARGS);
1572 else if (kill(pid, signum) < 0) {
1573 xprintf("%d: %s\n", pid, strerror(errno));
1574 err1++;
1575 goto cont;
1576 }
1577 #ifdef BSDJOBS
1578 if (signum == SIGTERM || signum == SIGHUP)
1579 (void) kill(pid, SIGCONT);
1580 #endif /* BSDJOBS */
1581 }
1582 cont:
1583 v++;
1584 }
1585 cleanup_until(&pchild_disabled);
1586 if (err1)
1587 stderror(ERR_SILENT);
1588 }
1589
1590 /*
1591 * pstart - start the job in foreground/background
1592 */
1593 int
pstart(struct process * pp,int foregnd)1594 pstart(struct process *pp, int foregnd)
1595 {
1596 int rv = 0;
1597 struct process *np;
1598 /* We don't use jobflags in this function right now (see below) */
1599 /* long jobflags = 0; */
1600
1601 pchild_disabled++;
1602 cleanup_push(&pchild_disabled, disabled_cleanup);
1603 np = pp;
1604 do {
1605 /* We don't use jobflags in this function right now (see below) */
1606 /* jobflags |= np->p_flags; */
1607 if (np->p_flags & (PRUNNING | PSTOPPED)) {
1608 np->p_flags |= PRUNNING;
1609 np->p_flags &= ~PSTOPPED;
1610 if (foregnd)
1611 np->p_flags |= PFOREGND;
1612 else
1613 np->p_flags &= ~PFOREGND;
1614 }
1615 } while ((np = np->p_friends) != pp);
1616 if (!foregnd)
1617 pclrcurr(pp);
1618 (void) pprint(pp, foregnd ? NAME | JOBDIR : NUMBER | NAME | AMPERSAND);
1619
1620 /* GrP run jobcmd hook if foregrounding */
1621 if (foregnd) {
1622 job_cmd(pp->p_command);
1623 }
1624
1625 #ifdef BSDJOBS
1626 if (foregnd) {
1627 rv = tcsetpgrp(FSHTTY, pp->p_jobid);
1628 }
1629 /*
1630 * 1. child process of csh (shell script) receives SIGTTIN/SIGTTOU
1631 * 2. parent process (csh) receives SIGCHLD
1632 * 3. The "csh" signal handling function pchild() is invoked
1633 * with a SIGCHLD signal.
1634 * 4. pchild() calls wait3(WNOHANG) which returns 0.
1635 * The child process is NOT ready to be waited for at this time.
1636 * pchild() returns without picking-up the correct status
1637 * for the child process which generated the SIGCHLD.
1638 * 5. CONSEQUENCE : csh is UNaware that the process is stopped
1639 * 6. THIS LINE HAS BEEN COMMENTED OUT : if (jobflags&PSTOPPED)
1640 * (beto@aixwiz.austin.ibm.com - aug/03/91)
1641 * 7. I removed the line completely and added extra checks for
1642 * pstart, so that if a job gets attached to and dies inside
1643 * a debugger it does not confuse the shell. [christos]
1644 * 8. on the nec sx-4 there seems to be a problem, which requires
1645 * a syscall(151, getpid(), getpid()) in osinit. Don't ask me
1646 * what this is doing. [schott@rzg.mpg.de]
1647 */
1648
1649 if (rv != -1)
1650 rv = killpg(pp->p_jobid, SIGCONT);
1651 #endif /* BSDJOBS */
1652 cleanup_until(&pchild_disabled);
1653 return rv != -1;
1654 }
1655
1656 void
panystop(int neednl)1657 panystop(int neednl)
1658 {
1659 struct process *pp;
1660
1661 chkstop = 2;
1662 for (pp = proclist.p_next; pp; pp = pp->p_next)
1663 if (pp->p_flags & PSTOPPED)
1664 stderror(ERR_STOPPED, neednl ? "\n" : "");
1665 }
1666
1667 struct process *
pfind(Char * cp)1668 pfind(Char *cp)
1669 {
1670 struct process *pp, *np;
1671
1672 if (cp == 0 || cp[1] == 0 || eq(cp, STRcent2) || eq(cp, STRcentplus)) {
1673 if (pcurrent == NULL)
1674 stderror(ERR_NAME | ERR_JOBCUR);
1675 return (pcurrent);
1676 }
1677 if (eq(cp, STRcentminus) || eq(cp, STRcenthash)) {
1678 if (pprevious == NULL)
1679 stderror(ERR_NAME | ERR_JOBPREV);
1680 return (pprevious);
1681 }
1682 if (Isdigit(cp[1])) {
1683 int idx = atoi(short2str(cp + 1));
1684
1685 for (pp = proclist.p_next; pp; pp = pp->p_next)
1686 if (pp->p_index == idx && pp->p_procid == pp->p_jobid)
1687 return (pp);
1688 stderror(ERR_NAME | ERR_NOSUCHJOB);
1689 }
1690 np = NULL;
1691 for (pp = proclist.p_next; pp; pp = pp->p_next)
1692 if (pp->p_procid == pp->p_jobid) {
1693 if (cp[1] == '?') {
1694 Char *dp;
1695
1696 for (dp = pp->p_command; *dp; dp++) {
1697 if (*dp != cp[2])
1698 continue;
1699 if (prefix(cp + 2, dp))
1700 goto match;
1701 }
1702 }
1703 else if (prefix(cp + 1, pp->p_command)) {
1704 match:
1705 if (np)
1706 stderror(ERR_NAME | ERR_AMBIG);
1707 np = pp;
1708 }
1709 }
1710 if (np)
1711 return (np);
1712 stderror(ERR_NAME | (cp[1] == '?' ? ERR_JOBPAT : ERR_NOSUCHJOB));
1713 /* NOTREACHED */
1714 return (0);
1715 }
1716
1717
1718 /*
1719 * pgetcurr - find most recent job that is not pp, preferably stopped
1720 */
1721 static struct process *
pgetcurr(struct process * pp)1722 pgetcurr(struct process *pp)
1723 {
1724 struct process *np;
1725 struct process *xp = NULL;
1726
1727 for (np = proclist.p_next; np; np = np->p_next)
1728 if (np != pcurrent && np != pp && np->p_procid &&
1729 np->p_procid == np->p_jobid) {
1730 if (np->p_flags & PSTOPPED)
1731 return (np);
1732 if (xp == NULL)
1733 xp = np;
1734 }
1735 return (xp);
1736 }
1737
1738 /*
1739 * donotify - flag the job so as to report termination asynchronously
1740 */
1741 /*ARGSUSED*/
1742 void
donotify(Char ** v,struct command * c)1743 donotify(Char **v, struct command *c)
1744 {
1745 struct process *pp;
1746
1747 USE(c);
1748 pp = pfind(*++v);
1749 pp->p_flags |= PNOTIFY;
1750 }
1751
1752 #ifdef SIGSYNCH
1753 static void
synch_handler(int sno)1754 synch_handler(int sno)
1755 {
1756 USE(sno);
1757 }
1758 #endif /* SIGSYNCH */
1759
1760 /*
1761 * Do the fork and whatever should be done in the child side that
1762 * should not be done if we are not forking at all (like for simple builtin's)
1763 * Also do everything that needs any signals fiddled with in the parent side
1764 *
1765 * Wanttty tells whether process and/or tty pgrps are to be manipulated:
1766 * -1: leave tty alone; inherit pgrp from parent
1767 * 0: already have tty; manipulate process pgrps only
1768 * 1: want to claim tty; manipulate process and tty pgrps
1769 * It is usually just the value of tpgrp.
1770 */
1771
1772 pid_t
pfork(struct command * t,int wanttty)1773 pfork(struct command *t, int wanttty)
1774 {
1775 pid_t pid;
1776 int ignint = 0;
1777 pid_t pgrp;
1778 #ifdef SIGSYNCH
1779 struct sigaction osa, nsa;
1780 #endif /* SIGSYNCH */
1781
1782 /*
1783 * A child will be uninterruptible only under very special conditions.
1784 * Remember that the semantics of '&' is implemented by disconnecting the
1785 * process from the tty so signals do not need to ignored just for '&'.
1786 * Thus signals are set to default action for children unless: we have had
1787 * an "onintr -" (then specifically ignored) we are not playing with
1788 * signals (inherit action)
1789 */
1790 if (setintr)
1791 ignint = (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT))
1792 || (gointr && eq(gointr, STRminus));
1793
1794 /*
1795 * Check for maximum nesting of 16 processes to avoid Forking loops
1796 */
1797 if (child == 16)
1798 stderror(ERR_NESTING, 16);
1799 #ifdef SIGSYNCH
1800 nsa.sa_handler = synch_handler;
1801 sigfillset(&nsa.sa_mask);
1802 nsa.sa_flags = SA_RESTART;
1803 if (sigaction(SIGSYNCH, &nsa, &osa))
1804 stderror(ERR_SYSTEM, "pfork: sigaction set", strerror(errno));
1805 #endif /* SIGSYNCH */
1806 /*
1807 * Hold pchild() until we have the process installed in our table.
1808 */
1809 if (wanttty < 0) {
1810 pchild_disabled++;
1811 cleanup_push(&pchild_disabled, disabled_cleanup);
1812 }
1813 while ((pid = fork()) == -1)
1814 if (setintr == 0)
1815 (void) sleep(FORKSLEEP);
1816 else
1817 stderror(ERR_NOPROC);
1818 if (pid == 0) {
1819 (void)cleanup_push_mark(); /* Never to be popped */
1820 pchild_disabled = 0;
1821 settimes();
1822 pgrp = pcurrjob ? pcurrjob->p_jobid : getpid();
1823 pflushall();
1824 pcurrjob = NULL;
1825 #if !defined(BSDTIMES) && !defined(_SEQUENT_)
1826 timesdone = 0;
1827 #endif /* !defined(BSDTIMES) && !defined(_SEQUENT_) */
1828 child++;
1829 if (setintr) {
1830 setintr = 0; /* until I think otherwise */
1831 /*
1832 * Children just get blown away on SIGINT, SIGQUIT unless "onintr
1833 * -" seen.
1834 */
1835 (void) signal(SIGINT, ignint ? SIG_IGN : SIG_DFL);
1836 (void) signal(SIGQUIT, ignint ? SIG_IGN : SIG_DFL);
1837 #ifdef BSDJOBS
1838 if (wanttty >= 0) {
1839 /* make stoppable */
1840 (void) signal(SIGTSTP, SIG_DFL);
1841 (void) signal(SIGTTIN, SIG_DFL);
1842 (void) signal(SIGTTOU, SIG_DFL);
1843 }
1844 #endif /* BSDJOBS */
1845 sigaction(SIGTERM, &parterm, NULL);
1846 }
1847 else if (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT)) {
1848 (void) signal(SIGINT, SIG_IGN);
1849 (void) signal(SIGQUIT, SIG_IGN);
1850 }
1851 #ifdef OREO
1852 signal(SIGIO, SIG_IGN); /* ignore SIGIO in child too */
1853 #endif /* OREO */
1854
1855 pgetty(wanttty, pgrp);
1856 /*
1857 * Nohup and nice apply only to NODE_COMMAND's but it would be nice
1858 * (?!?) if you could say "nohup (foo;bar)" Then the parser would have
1859 * to know about nice/nohup/time
1860 */
1861 if (t->t_dflg & F_NOHUP)
1862 (void) signal(SIGHUP, SIG_IGN);
1863 if (t->t_dflg & F_NICE) {
1864 int nval = SIGN_EXTEND_CHAR(t->t_nice);
1865 #if defined(HAVE_SETPRIORITY) && defined(PRIO_PROCESS)
1866 if (setpriority(PRIO_PROCESS, 0, nval) == -1 && errno)
1867 stderror(ERR_SYSTEM, "setpriority", strerror(errno));
1868 #else /* !HAVE_SETPRIORITY || !PRIO_PROCESS */
1869 (void) nice(nval);
1870 #endif /* HAVE_SETPRIORITY && PRIO_PROCESS */
1871 }
1872 #ifdef F_VER
1873 if (t->t_dflg & F_VER) {
1874 tsetenv(STRSYSTYPE, t->t_systype ? STRbsd43 : STRsys53);
1875 dohash(NULL, NULL);
1876 }
1877 #endif /* F_VER */
1878 #ifdef SIGSYNCH
1879 /* rfw 8/89 now parent can continue */
1880 if (kill(getppid(), SIGSYNCH))
1881 stderror(ERR_SYSTEM, "pfork child: kill", strerror(errno));
1882 #endif /* SIGSYNCH */
1883
1884 }
1885 else {
1886 #ifdef POSIXJOBS
1887 if (wanttty >= 0) {
1888 /*
1889 * `Walking' process group fix from Beto Appleton.
1890 * (beto@aixwiz.austin.ibm.com)
1891 * If setpgid fails at this point that means that
1892 * our process leader has died. We flush the current
1893 * job and become the process leader ourselves.
1894 * The parent will figure that out later.
1895 */
1896 pgrp = pcurrjob ? pcurrjob->p_jobid : pid;
1897 if (setpgid(pid, pgrp) == -1 && errno == EPERM) {
1898 pcurrjob = NULL;
1899 /*
1900 * We don't care if this causes an error here;
1901 * then we are already in the right process group
1902 */
1903 (void) setpgid(pid, pgrp = pid);
1904 }
1905 }
1906 #endif /* POSIXJOBS */
1907 palloc(pid, t);
1908 #ifdef SIGSYNCH
1909 {
1910 sigset_t pause_mask;
1911
1912 /*
1913 * rfw 8/89 Wait for child to own terminal. Solves half of ugly
1914 * synchronization problem. With this change, we know that the only
1915 * reason setpgrp to a previous process in a pipeline can fail is that
1916 * the previous process has already exited. Without this hack, he may
1917 * either have exited or not yet started to run. Two uglies become
1918 * one.
1919 */
1920 sigprocmask(SIG_BLOCK, NULL, &pause);
1921 sigdelset(&pause_mask, SIGCHLD);
1922 sigdelset(&pause_mask, SIGSYNCH);
1923 sigsuspend(&pause_mask);
1924 (void)handle_pending_signals();
1925 if (sigaction(SIGSYNCH, &osa, NULL))
1926 stderror(ERR_SYSTEM, "pfork parent: sigaction restore",
1927 strerror(errno));
1928 }
1929 #endif /* SIGSYNCH */
1930
1931 if (wanttty < 0)
1932 cleanup_until(&pchild_disabled);
1933 }
1934 return (pid);
1935 }
1936
1937 static void
okpcntl(void)1938 okpcntl(void)
1939 {
1940 if (tpgrp == -1)
1941 stderror(ERR_JOBCONTROL);
1942 if (tpgrp == 0)
1943 stderror(ERR_JOBCTRLSUB);
1944 }
1945
1946
1947 static void
setttypgrp(int pgrp)1948 setttypgrp(int pgrp)
1949 {
1950 /*
1951 * If we are piping out a builtin, eg. 'echo | more' things can go
1952 * out of sequence, i.e. the more can run before the echo. This
1953 * can happen even if we have vfork, since the echo will be forked
1954 * with the regular fork. In this case, we need to set the tty
1955 * pgrp ourselves. If that happens, then the process will be still
1956 * alive. And the tty process group will already be set.
1957 * This should fix the famous sequent problem as a side effect:
1958 * The controlling terminal is lost if all processes in the
1959 * terminal process group are zombies. In this case tcgetpgrp()
1960 * returns 0. If this happens we must set the terminal process
1961 * group again.
1962 */
1963 if (tcgetpgrp(FSHTTY) != pgrp) {
1964 #ifdef POSIXJOBS
1965 struct sigaction old;
1966
1967 /*
1968 * tcsetpgrp will set SIGTTOU to all the the processes in
1969 * the background according to POSIX... We ignore this here.
1970 */
1971 sigaction(SIGTTOU, NULL, &old);
1972 signal(SIGTTOU, SIG_IGN);
1973 #endif
1974 (void) tcsetpgrp(FSHTTY, pgrp);
1975 # ifdef POSIXJOBS
1976 sigaction(SIGTTOU, &old, NULL);
1977 # endif
1978
1979 }
1980 }
1981
1982
1983 /*
1984 * if we don't have vfork(), things can still go in the wrong order
1985 * resulting in the famous 'Stopped (tty output)'. But some systems
1986 * don't permit the setpgid() call, (these are more recent secure
1987 * systems such as ibm's aix), when they do. Then we'd rather print
1988 * an error message than hang the shell!
1989 * I am open to suggestions how to fix that.
1990 */
1991 void
pgetty(int wanttty,pid_t pgrp)1992 pgetty(int wanttty, pid_t pgrp)
1993 {
1994 #ifdef BSDJOBS
1995 # ifdef POSIXJOBS
1996 sigset_t oset, set;
1997 # endif /* POSIXJOBS */
1998
1999 jobdebug_xprintf(("wanttty %d pid %d opgrp%d pgrp %d tpgrp %d\n",
2000 wanttty, (int)getpid(), (int)pgrp, (int)mygetpgrp(),
2001 (int)tcgetpgrp(FSHTTY)));
2002 # ifdef POSIXJOBS
2003 /*
2004 * christos: I am blocking the tty signals till I've set things
2005 * correctly....
2006 */
2007 if (wanttty > 0) {
2008 sigemptyset(&set);
2009 sigaddset(&set, SIGTSTP);
2010 sigaddset(&set, SIGTTIN);
2011 (void)sigprocmask(SIG_BLOCK, &set, &oset);
2012 cleanup_push(&oset, sigprocmask_cleanup);
2013 }
2014 # endif /* POSIXJOBS */
2015
2016 # ifndef POSIXJOBS
2017 if (wanttty > 0)
2018 setttypgrp(pgrp);
2019 # endif /* !POSIXJOBS */
2020
2021 /*
2022 * From: Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
2023 * Don't check for tpgrp >= 0 so even non-interactive shells give
2024 * background jobs process groups Same for the comparison in the other part
2025 * of the #ifdef
2026 */
2027 if (wanttty >= 0) {
2028 if (setpgid(0, pgrp) == -1) {
2029 # ifdef POSIXJOBS
2030 /* Walking process group fix; see above */
2031 if (setpgid(0, pgrp = getpid()) == -1) {
2032 # endif /* POSIXJOBS */
2033 stderror(ERR_SYSTEM, "setpgid child:\n", strerror(errno));
2034 xexit(0);
2035 # ifdef POSIXJOBS
2036 }
2037 wanttty = pgrp; /* Now we really want the tty, since we became the
2038 * the process group leader
2039 */
2040 # endif /* POSIXJOBS */
2041 }
2042 }
2043
2044 # ifdef POSIXJOBS
2045 if (wanttty > 0) {
2046 setttypgrp(pgrp);
2047 cleanup_until(&oset);
2048 }
2049 # endif /* POSIXJOBS */
2050
2051 jobdebug_xprintf(("wanttty %d pid %d pgrp %d tpgrp %d\n",
2052 wanttty, getpid(), mygetpgrp(), tcgetpgrp(FSHTTY)));
2053
2054 if (tpgrp > 0)
2055 tpgrp = 0; /* gave tty away */
2056 #endif /* BSDJOBS */
2057 }
2058