1/*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
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 * 4. 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
33#ifndef lint
34#if 0
35static char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95";
36#endif
37#endif /* not lint */
38#include <sys/cdefs.h>
| 1/*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
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 * 4. 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
33#ifndef lint
34#if 0
35static char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95";
36#endif
37#endif /* not lint */
38#include <sys/cdefs.h>
|
39__FBSDID("$FreeBSD: head/bin/sh/jobs.c 213760 2010-10-13 04:01:01Z obrien $");
| 39__FBSDID("$FreeBSD: head/bin/sh/jobs.c 213775 2010-10-13 13:22:11Z jhb $");
|
40
| 40
|
41#include <fcntl.h>
42#include <signal.h>
43#include <errno.h>
44#include <paths.h>
45#include <unistd.h>
46#include <stdlib.h>
| 41#include <sys/ioctl.h>
|
47#include <sys/param.h>
| 42#include <sys/param.h>
|
48#include <sys/wait.h>
49#include <sys/time.h>
| |
50#include <sys/resource.h>
| 43#include <sys/resource.h>
|
| 44#include <sys/stddef.h>
45#include <sys/time.h>
46#include <sys/wait.h>
47#include <errno.h>
48#include <fcntl.h>
|
51#include <paths.h>
| 49#include <paths.h>
|
52#include <sys/ioctl.h>
| 50#include <signal.h>
51#include <stdlib.h>
52#include <unistd.h>
|
53
54#include "shell.h"
55#if JOBS
56#include <termios.h>
57#undef CEOF /* syntax.h redefines this */
58#endif
59#include "redir.h"
60#include "show.h"
61#include "main.h"
62#include "parser.h"
63#include "nodes.h"
64#include "jobs.h"
65#include "options.h"
66#include "trap.h"
67#include "syntax.h"
68#include "input.h"
69#include "output.h"
70#include "memalloc.h"
71#include "error.h"
72#include "mystring.h"
73
74
75static struct job *jobtab; /* array of jobs */
76static int njobs; /* size of array */
77MKINIT pid_t backgndpid = -1; /* pid of last background process */
78MKINIT struct job *bgjob = NULL; /* last background process */
79#if JOBS
80static struct job *jobmru; /* most recently used job list */
81static pid_t initialpgrp; /* pgrp of shell on invocation */
82#endif
83int in_waitcmd = 0; /* are we in waitcmd()? */
84int in_dowait = 0; /* are we in dowait()? */
85volatile sig_atomic_t breakwaitcmd = 0; /* should wait be terminated? */
86static int ttyfd = -1;
87
88#if JOBS
89STATIC void restartjob(struct job *);
90#endif
91STATIC void freejob(struct job *);
92STATIC struct job *getjob(char *);
93STATIC pid_t dowait(int, struct job *);
94STATIC pid_t waitproc(int, int *);
95STATIC void checkzombies(void);
96STATIC void cmdtxt(union node *);
97STATIC void cmdputs(const char *);
98#if JOBS
99STATIC void setcurjob(struct job *);
100STATIC void deljob(struct job *);
101STATIC struct job *getcurjob(struct job *);
102#endif
103STATIC void showjob(struct job *, pid_t, int);
104
105
106/*
107 * Turn job control on and off.
108 */
109
110MKINIT int jobctl;
111
112#if JOBS
113void
114setjobctl(int on)
115{
116 int i;
117
118 if (on == jobctl || rootshell == 0)
119 return;
120 if (on) {
121 if (ttyfd != -1)
122 close(ttyfd);
123 if ((ttyfd = open(_PATH_TTY, O_RDWR)) < 0) {
124 i = 0;
125 while (i <= 2 && !isatty(i))
126 i++;
127 if (i > 2 || (ttyfd = fcntl(i, F_DUPFD, 10)) < 0)
128 goto out;
129 }
130 if (ttyfd < 10) {
131 /*
132 * Keep our TTY file descriptor out of the way of
133 * the user's redirections.
134 */
135 if ((i = fcntl(ttyfd, F_DUPFD, 10)) < 0) {
136 close(ttyfd);
137 ttyfd = -1;
138 goto out;
139 }
140 close(ttyfd);
141 ttyfd = i;
142 }
143 if (fcntl(ttyfd, F_SETFD, FD_CLOEXEC) < 0) {
144 close(ttyfd);
145 ttyfd = -1;
146 goto out;
147 }
148 do { /* while we are in the background */
149 initialpgrp = tcgetpgrp(ttyfd);
150 if (initialpgrp < 0) {
151out: out2fmt_flush("sh: can't access tty; job control turned off\n");
152 mflag = 0;
153 return;
154 }
155 if (initialpgrp == -1)
156 initialpgrp = getpgrp();
157 else if (initialpgrp != getpgrp()) {
158 killpg(0, SIGTTIN);
159 continue;
160 }
161 } while (0);
162 setsignal(SIGTSTP);
163 setsignal(SIGTTOU);
164 setsignal(SIGTTIN);
165 setpgid(0, rootpid);
166 tcsetpgrp(ttyfd, rootpid);
167 } else { /* turning job control off */
168 setpgid(0, initialpgrp);
169 tcsetpgrp(ttyfd, initialpgrp);
170 close(ttyfd);
171 ttyfd = -1;
172 setsignal(SIGTSTP);
173 setsignal(SIGTTOU);
174 setsignal(SIGTTIN);
175 }
176 jobctl = on;
177}
178#endif
179
180
181#ifdef mkinit
182INCLUDE <sys/types.h>
183INCLUDE <stdlib.h>
184
185SHELLPROC {
186 backgndpid = -1;
187 bgjob = NULL;
188#if JOBS
189 jobctl = 0;
190#endif
191}
192
193#endif
194
195
196
197#if JOBS
198int
199fgcmd(int argc __unused, char **argv)
200{
201 struct job *jp;
202 pid_t pgrp;
203 int status;
204
205 jp = getjob(argv[1]);
206 if (jp->jobctl == 0)
207 error("job not created under job control");
208 out1str(jp->ps[0].cmd);
209 out1c('\n');
210 flushout(&output);
211 pgrp = jp->ps[0].pid;
212 tcsetpgrp(ttyfd, pgrp);
213 restartjob(jp);
214 jp->foreground = 1;
215 INTOFF;
216 status = waitforjob(jp, (int *)NULL);
217 INTON;
218 return status;
219}
220
221
222int
223bgcmd(int argc, char **argv)
224{
225 char s[64];
226 struct job *jp;
227
228 do {
229 jp = getjob(*++argv);
230 if (jp->jobctl == 0)
231 error("job not created under job control");
232 if (jp->state == JOBDONE)
233 continue;
234 restartjob(jp);
235 jp->foreground = 0;
236 fmtstr(s, 64, "[%td] ", jp - jobtab + 1);
237 out1str(s);
238 out1str(jp->ps[0].cmd);
239 out1c('\n');
240 } while (--argc > 1);
241 return 0;
242}
243
244
245STATIC void
246restartjob(struct job *jp)
247{
248 struct procstat *ps;
249 int i;
250
251 if (jp->state == JOBDONE)
252 return;
253 setcurjob(jp);
254 INTOFF;
255 killpg(jp->ps[0].pid, SIGCONT);
256 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
257 if (WIFSTOPPED(ps->status)) {
258 ps->status = -1;
259 jp->state = 0;
260 }
261 }
262 INTON;
263}
264#endif
265
266
267int
268jobscmd(int argc, char *argv[])
269{
270 char *id;
271 int ch, mode;
272
273 optind = optreset = 1;
274 opterr = 0;
275 mode = SHOWJOBS_DEFAULT;
276 while ((ch = getopt(argc, argv, "lps")) != -1) {
277 switch (ch) {
278 case 'l':
279 mode = SHOWJOBS_VERBOSE;
280 break;
281 case 'p':
282 mode = SHOWJOBS_PGIDS;
283 break;
284 case 's':
285 mode = SHOWJOBS_PIDS;
286 break;
287 case '?':
288 default:
289 error("unknown option: -%c", optopt);
290 }
291 }
292 argc -= optind;
293 argv += optind;
294
295 if (argc == 0)
296 showjobs(0, mode);
297 else
298 while ((id = *argv++) != NULL)
299 showjob(getjob(id), 0, mode);
300
301 return (0);
302}
303
304STATIC void
305showjob(struct job *jp, pid_t pid, int mode)
306{
307 char s[64];
308 struct procstat *ps;
309 struct job *j;
310 int col, curr, i, jobno, prev, procno;
311 pid_t ppid;
312 char c;
313
314 procno = (mode == SHOWJOBS_PGIDS) ? 1 : jp->nprocs;
315 jobno = jp - jobtab + 1;
316 curr = prev = 0;
317#if JOBS
318 if ((j = getcurjob(NULL)) != NULL) {
319 curr = j - jobtab + 1;
320 if ((j = getcurjob(j)) != NULL)
321 prev = j - jobtab + 1;
322 }
323#endif
324 for (ps = jp->ps ; ; ps++) { /* for each process */
325 if (mode == SHOWJOBS_PIDS || mode == SHOWJOBS_PGIDS) {
326 ppid = (mode == SHOWJOBS_PIDS) ? ps->pid :
327 getpgid(ps->pid);
328 out1fmt("%d\n", (int)ppid);
329 goto skip;
330 }
331 if (mode != SHOWJOBS_VERBOSE && ps != jp->ps && pid == 0)
332 goto skip;
333 if (pid != 0 && pid != ps->pid)
334 goto skip;
335 if (jobno == curr && ps == jp->ps)
336 c = '+';
337 else if (jobno == prev && ps == jp->ps)
338 c = '-';
339 else
340 c = ' ';
341 if (ps == jp->ps)
342 fmtstr(s, 64, "[%d] %c ", jobno, c);
343 else
344 fmtstr(s, 64, " %c ", c);
345 out1str(s);
346 col = strlen(s);
347 if (mode == SHOWJOBS_VERBOSE) {
348 fmtstr(s, 64, "%d ", (int)ps->pid);
349 out1str(s);
350 col += strlen(s);
351 }
352 s[0] = '\0';
353 if (ps != jp->ps) {
354 *s = '\0';
355 } else if (ps->status == -1) {
356 strcpy(s, "Running");
357 } else if (WIFEXITED(ps->status)) {
358 if (WEXITSTATUS(ps->status) == 0)
359 strcpy(s, "Done");
360 else
361 fmtstr(s, 64, "Done (%d)",
362 WEXITSTATUS(ps->status));
363 } else {
364#if JOBS
365 if (WIFSTOPPED(ps->status))
366 i = WSTOPSIG(ps->status);
367 else
368#endif
369 i = WTERMSIG(ps->status);
370 if ((i & 0x7F) < sys_nsig && sys_siglist[i & 0x7F])
371 scopy(sys_siglist[i & 0x7F], s);
372 else
373 fmtstr(s, 64, "Signal %d", i & 0x7F);
374 if (WCOREDUMP(ps->status))
375 strcat(s, " (core dumped)");
376 }
377 out1str(s);
378 col += strlen(s);
379 do {
380 out1c(' ');
381 col++;
382 } while (col < 30);
383 out1str(ps->cmd);
384 out1c('\n');
385skip: if (--procno <= 0)
386 break;
387 }
388}
389
390/*
391 * Print a list of jobs. If "change" is nonzero, only print jobs whose
392 * statuses have changed since the last call to showjobs.
393 *
394 * If the shell is interrupted in the process of creating a job, the
395 * result may be a job structure containing zero processes. Such structures
396 * will be freed here.
397 */
398
399void
400showjobs(int change, int mode)
401{
402 int jobno;
403 struct job *jp;
404
405 TRACE(("showjobs(%d) called\n", change));
406 checkzombies();
407 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) {
408 if (! jp->used)
409 continue;
410 if (jp->nprocs == 0) {
411 freejob(jp);
412 continue;
413 }
414 if (change && ! jp->changed)
415 continue;
416 showjob(jp, 0, mode);
417 jp->changed = 0;
418 /* Hack: discard jobs for which $! has not been referenced
419 * in interactive mode when they terminate.
420 */
421 if (jp->state == JOBDONE && !jp->remembered &&
422 (iflag || jp != bgjob)) {
423 freejob(jp);
424 }
425 }
426}
427
428
429/*
430 * Mark a job structure as unused.
431 */
432
433STATIC void
434freejob(struct job *jp)
435{
436 struct procstat *ps;
437 int i;
438
439 INTOFF;
440 if (bgjob == jp)
441 bgjob = NULL;
442 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
443 if (ps->cmd != nullstr)
444 ckfree(ps->cmd);
445 }
446 if (jp->ps != &jp->ps0)
447 ckfree(jp->ps);
448 jp->used = 0;
449#if JOBS
450 deljob(jp);
451#endif
452 INTON;
453}
454
455
456
457int
458waitcmd(int argc, char **argv)
459{
460 struct job *job;
461 int status, retval;
462 struct job *jp;
463
464 if (argc > 1) {
465 job = getjob(argv[1]);
466 } else {
467 job = NULL;
468 }
469
470 /*
471 * Loop until a process is terminated or stopped, or a SIGINT is
472 * received.
473 */
474
475 in_waitcmd++;
476 do {
477 if (job != NULL) {
478 if (job->state) {
479 status = job->ps[job->nprocs - 1].status;
480 if (WIFEXITED(status))
481 retval = WEXITSTATUS(status);
482#if JOBS
483 else if (WIFSTOPPED(status))
484 retval = WSTOPSIG(status) + 128;
485#endif
486 else
487 retval = WTERMSIG(status) + 128;
488 if (! iflag || ! job->changed)
489 freejob(job);
490 else {
491 job->remembered = 0;
492 if (job == bgjob)
493 bgjob = NULL;
494 }
495 in_waitcmd--;
496 return retval;
497 }
498 } else {
499 for (jp = jobtab ; jp < jobtab + njobs; jp++)
500 if (jp->used && jp->state == JOBDONE) {
501 if (! iflag || ! jp->changed)
502 freejob(jp);
503 else {
504 jp->remembered = 0;
505 if (jp == bgjob)
506 bgjob = NULL;
507 }
508 }
509 for (jp = jobtab ; ; jp++) {
510 if (jp >= jobtab + njobs) { /* no running procs */
511 in_waitcmd--;
512 return 0;
513 }
514 if (jp->used && jp->state == 0)
515 break;
516 }
517 }
518 } while (dowait(1, (struct job *)NULL) != -1);
519 in_waitcmd--;
520
521 return 0;
522}
523
524
525
526int
527jobidcmd(int argc __unused, char **argv)
528{
529 struct job *jp;
530 int i;
531
532 jp = getjob(argv[1]);
533 for (i = 0 ; i < jp->nprocs ; ) {
534 out1fmt("%d", (int)jp->ps[i].pid);
535 out1c(++i < jp->nprocs? ' ' : '\n');
536 }
537 return 0;
538}
539
540
541
542/*
543 * Convert a job name to a job structure.
544 */
545
546STATIC struct job *
547getjob(char *name)
548{
549 int jobno;
550 struct job *found, *jp;
551 pid_t pid;
552 int i;
553
554 if (name == NULL) {
555#if JOBS
556currentjob: if ((jp = getcurjob(NULL)) == NULL)
557 error("No current job");
558 return (jp);
559#else
560 error("No current job");
561#endif
562 } else if (name[0] == '%') {
563 if (is_digit(name[1])) {
564 jobno = number(name + 1);
565 if (jobno > 0 && jobno <= njobs
566 && jobtab[jobno - 1].used != 0)
567 return &jobtab[jobno - 1];
568#if JOBS
569 } else if (name[1] == '%' && name[2] == '\0') {
570 goto currentjob;
571 } else if (name[1] == '+' && name[2] == '\0') {
572 goto currentjob;
573 } else if (name[1] == '-' && name[2] == '\0') {
574 if ((jp = getcurjob(NULL)) == NULL ||
575 (jp = getcurjob(jp)) == NULL)
576 error("No previous job");
577 return (jp);
578#endif
579 } else if (name[1] == '?') {
580 found = NULL;
581 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
582 if (jp->used && jp->nprocs > 0
583 && strstr(jp->ps[0].cmd, name + 2) != NULL) {
584 if (found)
585 error("%s: ambiguous", name);
586 found = jp;
587 }
588 }
589 if (found != NULL)
590 return (found);
591 } else {
592 found = NULL;
593 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
594 if (jp->used && jp->nprocs > 0
595 && prefix(name + 1, jp->ps[0].cmd)) {
596 if (found)
597 error("%s: ambiguous", name);
598 found = jp;
599 }
600 }
601 if (found)
602 return found;
603 }
604 } else if (is_number(name)) {
605 pid = (pid_t)number(name);
606 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
607 if (jp->used && jp->nprocs > 0
608 && jp->ps[jp->nprocs - 1].pid == pid)
609 return jp;
610 }
611 }
612 error("No such job: %s", name);
613 /*NOTREACHED*/
614 return NULL;
615}
616
617
618
619/*
620 * Return a new job structure,
621 */
622
623struct job *
624makejob(union node *node __unused, int nprocs)
625{
626 int i;
627 struct job *jp;
628
629 for (i = njobs, jp = jobtab ; ; jp++) {
630 if (--i < 0) {
631 INTOFF;
632 if (njobs == 0) {
633 jobtab = ckmalloc(4 * sizeof jobtab[0]);
634#if JOBS
635 jobmru = NULL;
636#endif
637 } else {
638 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]);
639 memcpy(jp, jobtab, njobs * sizeof jp[0]);
640#if JOBS
641 /* Relocate `next' pointers and list head */
642 if (jobmru != NULL)
643 jobmru = &jp[jobmru - jobtab];
644 for (i = 0; i < njobs; i++)
645 if (jp[i].next != NULL)
646 jp[i].next = &jp[jp[i].next -
647 jobtab];
648#endif
649 if (bgjob != NULL)
650 bgjob = &jp[bgjob - jobtab];
651 /* Relocate `ps' pointers */
652 for (i = 0; i < njobs; i++)
653 if (jp[i].ps == &jobtab[i].ps0)
654 jp[i].ps = &jp[i].ps0;
655 ckfree(jobtab);
656 jobtab = jp;
657 }
658 jp = jobtab + njobs;
659 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0);
660 INTON;
661 break;
662 }
663 if (jp->used == 0)
664 break;
665 }
666 INTOFF;
667 jp->state = 0;
668 jp->used = 1;
669 jp->changed = 0;
670 jp->nprocs = 0;
671 jp->foreground = 0;
672 jp->remembered = 0;
673#if JOBS
674 jp->jobctl = jobctl;
675 jp->next = NULL;
676#endif
677 if (nprocs > 1) {
678 jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
679 } else {
680 jp->ps = &jp->ps0;
681 }
682 INTON;
| 53
54#include "shell.h"
55#if JOBS
56#include <termios.h>
57#undef CEOF /* syntax.h redefines this */
58#endif
59#include "redir.h"
60#include "show.h"
61#include "main.h"
62#include "parser.h"
63#include "nodes.h"
64#include "jobs.h"
65#include "options.h"
66#include "trap.h"
67#include "syntax.h"
68#include "input.h"
69#include "output.h"
70#include "memalloc.h"
71#include "error.h"
72#include "mystring.h"
73
74
75static struct job *jobtab; /* array of jobs */
76static int njobs; /* size of array */
77MKINIT pid_t backgndpid = -1; /* pid of last background process */
78MKINIT struct job *bgjob = NULL; /* last background process */
79#if JOBS
80static struct job *jobmru; /* most recently used job list */
81static pid_t initialpgrp; /* pgrp of shell on invocation */
82#endif
83int in_waitcmd = 0; /* are we in waitcmd()? */
84int in_dowait = 0; /* are we in dowait()? */
85volatile sig_atomic_t breakwaitcmd = 0; /* should wait be terminated? */
86static int ttyfd = -1;
87
88#if JOBS
89STATIC void restartjob(struct job *);
90#endif
91STATIC void freejob(struct job *);
92STATIC struct job *getjob(char *);
93STATIC pid_t dowait(int, struct job *);
94STATIC pid_t waitproc(int, int *);
95STATIC void checkzombies(void);
96STATIC void cmdtxt(union node *);
97STATIC void cmdputs(const char *);
98#if JOBS
99STATIC void setcurjob(struct job *);
100STATIC void deljob(struct job *);
101STATIC struct job *getcurjob(struct job *);
102#endif
103STATIC void showjob(struct job *, pid_t, int);
104
105
106/*
107 * Turn job control on and off.
108 */
109
110MKINIT int jobctl;
111
112#if JOBS
113void
114setjobctl(int on)
115{
116 int i;
117
118 if (on == jobctl || rootshell == 0)
119 return;
120 if (on) {
121 if (ttyfd != -1)
122 close(ttyfd);
123 if ((ttyfd = open(_PATH_TTY, O_RDWR)) < 0) {
124 i = 0;
125 while (i <= 2 && !isatty(i))
126 i++;
127 if (i > 2 || (ttyfd = fcntl(i, F_DUPFD, 10)) < 0)
128 goto out;
129 }
130 if (ttyfd < 10) {
131 /*
132 * Keep our TTY file descriptor out of the way of
133 * the user's redirections.
134 */
135 if ((i = fcntl(ttyfd, F_DUPFD, 10)) < 0) {
136 close(ttyfd);
137 ttyfd = -1;
138 goto out;
139 }
140 close(ttyfd);
141 ttyfd = i;
142 }
143 if (fcntl(ttyfd, F_SETFD, FD_CLOEXEC) < 0) {
144 close(ttyfd);
145 ttyfd = -1;
146 goto out;
147 }
148 do { /* while we are in the background */
149 initialpgrp = tcgetpgrp(ttyfd);
150 if (initialpgrp < 0) {
151out: out2fmt_flush("sh: can't access tty; job control turned off\n");
152 mflag = 0;
153 return;
154 }
155 if (initialpgrp == -1)
156 initialpgrp = getpgrp();
157 else if (initialpgrp != getpgrp()) {
158 killpg(0, SIGTTIN);
159 continue;
160 }
161 } while (0);
162 setsignal(SIGTSTP);
163 setsignal(SIGTTOU);
164 setsignal(SIGTTIN);
165 setpgid(0, rootpid);
166 tcsetpgrp(ttyfd, rootpid);
167 } else { /* turning job control off */
168 setpgid(0, initialpgrp);
169 tcsetpgrp(ttyfd, initialpgrp);
170 close(ttyfd);
171 ttyfd = -1;
172 setsignal(SIGTSTP);
173 setsignal(SIGTTOU);
174 setsignal(SIGTTIN);
175 }
176 jobctl = on;
177}
178#endif
179
180
181#ifdef mkinit
182INCLUDE <sys/types.h>
183INCLUDE <stdlib.h>
184
185SHELLPROC {
186 backgndpid = -1;
187 bgjob = NULL;
188#if JOBS
189 jobctl = 0;
190#endif
191}
192
193#endif
194
195
196
197#if JOBS
198int
199fgcmd(int argc __unused, char **argv)
200{
201 struct job *jp;
202 pid_t pgrp;
203 int status;
204
205 jp = getjob(argv[1]);
206 if (jp->jobctl == 0)
207 error("job not created under job control");
208 out1str(jp->ps[0].cmd);
209 out1c('\n');
210 flushout(&output);
211 pgrp = jp->ps[0].pid;
212 tcsetpgrp(ttyfd, pgrp);
213 restartjob(jp);
214 jp->foreground = 1;
215 INTOFF;
216 status = waitforjob(jp, (int *)NULL);
217 INTON;
218 return status;
219}
220
221
222int
223bgcmd(int argc, char **argv)
224{
225 char s[64];
226 struct job *jp;
227
228 do {
229 jp = getjob(*++argv);
230 if (jp->jobctl == 0)
231 error("job not created under job control");
232 if (jp->state == JOBDONE)
233 continue;
234 restartjob(jp);
235 jp->foreground = 0;
236 fmtstr(s, 64, "[%td] ", jp - jobtab + 1);
237 out1str(s);
238 out1str(jp->ps[0].cmd);
239 out1c('\n');
240 } while (--argc > 1);
241 return 0;
242}
243
244
245STATIC void
246restartjob(struct job *jp)
247{
248 struct procstat *ps;
249 int i;
250
251 if (jp->state == JOBDONE)
252 return;
253 setcurjob(jp);
254 INTOFF;
255 killpg(jp->ps[0].pid, SIGCONT);
256 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
257 if (WIFSTOPPED(ps->status)) {
258 ps->status = -1;
259 jp->state = 0;
260 }
261 }
262 INTON;
263}
264#endif
265
266
267int
268jobscmd(int argc, char *argv[])
269{
270 char *id;
271 int ch, mode;
272
273 optind = optreset = 1;
274 opterr = 0;
275 mode = SHOWJOBS_DEFAULT;
276 while ((ch = getopt(argc, argv, "lps")) != -1) {
277 switch (ch) {
278 case 'l':
279 mode = SHOWJOBS_VERBOSE;
280 break;
281 case 'p':
282 mode = SHOWJOBS_PGIDS;
283 break;
284 case 's':
285 mode = SHOWJOBS_PIDS;
286 break;
287 case '?':
288 default:
289 error("unknown option: -%c", optopt);
290 }
291 }
292 argc -= optind;
293 argv += optind;
294
295 if (argc == 0)
296 showjobs(0, mode);
297 else
298 while ((id = *argv++) != NULL)
299 showjob(getjob(id), 0, mode);
300
301 return (0);
302}
303
304STATIC void
305showjob(struct job *jp, pid_t pid, int mode)
306{
307 char s[64];
308 struct procstat *ps;
309 struct job *j;
310 int col, curr, i, jobno, prev, procno;
311 pid_t ppid;
312 char c;
313
314 procno = (mode == SHOWJOBS_PGIDS) ? 1 : jp->nprocs;
315 jobno = jp - jobtab + 1;
316 curr = prev = 0;
317#if JOBS
318 if ((j = getcurjob(NULL)) != NULL) {
319 curr = j - jobtab + 1;
320 if ((j = getcurjob(j)) != NULL)
321 prev = j - jobtab + 1;
322 }
323#endif
324 for (ps = jp->ps ; ; ps++) { /* for each process */
325 if (mode == SHOWJOBS_PIDS || mode == SHOWJOBS_PGIDS) {
326 ppid = (mode == SHOWJOBS_PIDS) ? ps->pid :
327 getpgid(ps->pid);
328 out1fmt("%d\n", (int)ppid);
329 goto skip;
330 }
331 if (mode != SHOWJOBS_VERBOSE && ps != jp->ps && pid == 0)
332 goto skip;
333 if (pid != 0 && pid != ps->pid)
334 goto skip;
335 if (jobno == curr && ps == jp->ps)
336 c = '+';
337 else if (jobno == prev && ps == jp->ps)
338 c = '-';
339 else
340 c = ' ';
341 if (ps == jp->ps)
342 fmtstr(s, 64, "[%d] %c ", jobno, c);
343 else
344 fmtstr(s, 64, " %c ", c);
345 out1str(s);
346 col = strlen(s);
347 if (mode == SHOWJOBS_VERBOSE) {
348 fmtstr(s, 64, "%d ", (int)ps->pid);
349 out1str(s);
350 col += strlen(s);
351 }
352 s[0] = '\0';
353 if (ps != jp->ps) {
354 *s = '\0';
355 } else if (ps->status == -1) {
356 strcpy(s, "Running");
357 } else if (WIFEXITED(ps->status)) {
358 if (WEXITSTATUS(ps->status) == 0)
359 strcpy(s, "Done");
360 else
361 fmtstr(s, 64, "Done (%d)",
362 WEXITSTATUS(ps->status));
363 } else {
364#if JOBS
365 if (WIFSTOPPED(ps->status))
366 i = WSTOPSIG(ps->status);
367 else
368#endif
369 i = WTERMSIG(ps->status);
370 if ((i & 0x7F) < sys_nsig && sys_siglist[i & 0x7F])
371 scopy(sys_siglist[i & 0x7F], s);
372 else
373 fmtstr(s, 64, "Signal %d", i & 0x7F);
374 if (WCOREDUMP(ps->status))
375 strcat(s, " (core dumped)");
376 }
377 out1str(s);
378 col += strlen(s);
379 do {
380 out1c(' ');
381 col++;
382 } while (col < 30);
383 out1str(ps->cmd);
384 out1c('\n');
385skip: if (--procno <= 0)
386 break;
387 }
388}
389
390/*
391 * Print a list of jobs. If "change" is nonzero, only print jobs whose
392 * statuses have changed since the last call to showjobs.
393 *
394 * If the shell is interrupted in the process of creating a job, the
395 * result may be a job structure containing zero processes. Such structures
396 * will be freed here.
397 */
398
399void
400showjobs(int change, int mode)
401{
402 int jobno;
403 struct job *jp;
404
405 TRACE(("showjobs(%d) called\n", change));
406 checkzombies();
407 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) {
408 if (! jp->used)
409 continue;
410 if (jp->nprocs == 0) {
411 freejob(jp);
412 continue;
413 }
414 if (change && ! jp->changed)
415 continue;
416 showjob(jp, 0, mode);
417 jp->changed = 0;
418 /* Hack: discard jobs for which $! has not been referenced
419 * in interactive mode when they terminate.
420 */
421 if (jp->state == JOBDONE && !jp->remembered &&
422 (iflag || jp != bgjob)) {
423 freejob(jp);
424 }
425 }
426}
427
428
429/*
430 * Mark a job structure as unused.
431 */
432
433STATIC void
434freejob(struct job *jp)
435{
436 struct procstat *ps;
437 int i;
438
439 INTOFF;
440 if (bgjob == jp)
441 bgjob = NULL;
442 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
443 if (ps->cmd != nullstr)
444 ckfree(ps->cmd);
445 }
446 if (jp->ps != &jp->ps0)
447 ckfree(jp->ps);
448 jp->used = 0;
449#if JOBS
450 deljob(jp);
451#endif
452 INTON;
453}
454
455
456
457int
458waitcmd(int argc, char **argv)
459{
460 struct job *job;
461 int status, retval;
462 struct job *jp;
463
464 if (argc > 1) {
465 job = getjob(argv[1]);
466 } else {
467 job = NULL;
468 }
469
470 /*
471 * Loop until a process is terminated or stopped, or a SIGINT is
472 * received.
473 */
474
475 in_waitcmd++;
476 do {
477 if (job != NULL) {
478 if (job->state) {
479 status = job->ps[job->nprocs - 1].status;
480 if (WIFEXITED(status))
481 retval = WEXITSTATUS(status);
482#if JOBS
483 else if (WIFSTOPPED(status))
484 retval = WSTOPSIG(status) + 128;
485#endif
486 else
487 retval = WTERMSIG(status) + 128;
488 if (! iflag || ! job->changed)
489 freejob(job);
490 else {
491 job->remembered = 0;
492 if (job == bgjob)
493 bgjob = NULL;
494 }
495 in_waitcmd--;
496 return retval;
497 }
498 } else {
499 for (jp = jobtab ; jp < jobtab + njobs; jp++)
500 if (jp->used && jp->state == JOBDONE) {
501 if (! iflag || ! jp->changed)
502 freejob(jp);
503 else {
504 jp->remembered = 0;
505 if (jp == bgjob)
506 bgjob = NULL;
507 }
508 }
509 for (jp = jobtab ; ; jp++) {
510 if (jp >= jobtab + njobs) { /* no running procs */
511 in_waitcmd--;
512 return 0;
513 }
514 if (jp->used && jp->state == 0)
515 break;
516 }
517 }
518 } while (dowait(1, (struct job *)NULL) != -1);
519 in_waitcmd--;
520
521 return 0;
522}
523
524
525
526int
527jobidcmd(int argc __unused, char **argv)
528{
529 struct job *jp;
530 int i;
531
532 jp = getjob(argv[1]);
533 for (i = 0 ; i < jp->nprocs ; ) {
534 out1fmt("%d", (int)jp->ps[i].pid);
535 out1c(++i < jp->nprocs? ' ' : '\n');
536 }
537 return 0;
538}
539
540
541
542/*
543 * Convert a job name to a job structure.
544 */
545
546STATIC struct job *
547getjob(char *name)
548{
549 int jobno;
550 struct job *found, *jp;
551 pid_t pid;
552 int i;
553
554 if (name == NULL) {
555#if JOBS
556currentjob: if ((jp = getcurjob(NULL)) == NULL)
557 error("No current job");
558 return (jp);
559#else
560 error("No current job");
561#endif
562 } else if (name[0] == '%') {
563 if (is_digit(name[1])) {
564 jobno = number(name + 1);
565 if (jobno > 0 && jobno <= njobs
566 && jobtab[jobno - 1].used != 0)
567 return &jobtab[jobno - 1];
568#if JOBS
569 } else if (name[1] == '%' && name[2] == '\0') {
570 goto currentjob;
571 } else if (name[1] == '+' && name[2] == '\0') {
572 goto currentjob;
573 } else if (name[1] == '-' && name[2] == '\0') {
574 if ((jp = getcurjob(NULL)) == NULL ||
575 (jp = getcurjob(jp)) == NULL)
576 error("No previous job");
577 return (jp);
578#endif
579 } else if (name[1] == '?') {
580 found = NULL;
581 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
582 if (jp->used && jp->nprocs > 0
583 && strstr(jp->ps[0].cmd, name + 2) != NULL) {
584 if (found)
585 error("%s: ambiguous", name);
586 found = jp;
587 }
588 }
589 if (found != NULL)
590 return (found);
591 } else {
592 found = NULL;
593 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
594 if (jp->used && jp->nprocs > 0
595 && prefix(name + 1, jp->ps[0].cmd)) {
596 if (found)
597 error("%s: ambiguous", name);
598 found = jp;
599 }
600 }
601 if (found)
602 return found;
603 }
604 } else if (is_number(name)) {
605 pid = (pid_t)number(name);
606 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
607 if (jp->used && jp->nprocs > 0
608 && jp->ps[jp->nprocs - 1].pid == pid)
609 return jp;
610 }
611 }
612 error("No such job: %s", name);
613 /*NOTREACHED*/
614 return NULL;
615}
616
617
618
619/*
620 * Return a new job structure,
621 */
622
623struct job *
624makejob(union node *node __unused, int nprocs)
625{
626 int i;
627 struct job *jp;
628
629 for (i = njobs, jp = jobtab ; ; jp++) {
630 if (--i < 0) {
631 INTOFF;
632 if (njobs == 0) {
633 jobtab = ckmalloc(4 * sizeof jobtab[0]);
634#if JOBS
635 jobmru = NULL;
636#endif
637 } else {
638 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]);
639 memcpy(jp, jobtab, njobs * sizeof jp[0]);
640#if JOBS
641 /* Relocate `next' pointers and list head */
642 if (jobmru != NULL)
643 jobmru = &jp[jobmru - jobtab];
644 for (i = 0; i < njobs; i++)
645 if (jp[i].next != NULL)
646 jp[i].next = &jp[jp[i].next -
647 jobtab];
648#endif
649 if (bgjob != NULL)
650 bgjob = &jp[bgjob - jobtab];
651 /* Relocate `ps' pointers */
652 for (i = 0; i < njobs; i++)
653 if (jp[i].ps == &jobtab[i].ps0)
654 jp[i].ps = &jp[i].ps0;
655 ckfree(jobtab);
656 jobtab = jp;
657 }
658 jp = jobtab + njobs;
659 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0);
660 INTON;
661 break;
662 }
663 if (jp->used == 0)
664 break;
665 }
666 INTOFF;
667 jp->state = 0;
668 jp->used = 1;
669 jp->changed = 0;
670 jp->nprocs = 0;
671 jp->foreground = 0;
672 jp->remembered = 0;
673#if JOBS
674 jp->jobctl = jobctl;
675 jp->next = NULL;
676#endif
677 if (nprocs > 1) {
678 jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
679 } else {
680 jp->ps = &jp->ps0;
681 }
682 INTON;
|
683 TRACE(("makejob(%p, %d) returns %%%d\n", (void *)node, nprocs,
| 683 TRACE(("makejob(%p, %d) returns %%%td\n", (void *)node, nprocs,
|
684 jp - jobtab + 1));
685 return jp;
686}
687
688#if JOBS
689STATIC void
690setcurjob(struct job *cj)
691{
692 struct job *jp, *prev;
693
694 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) {
695 if (jp == cj) {
696 if (prev != NULL)
697 prev->next = jp->next;
698 else
699 jobmru = jp->next;
700 jp->next = jobmru;
701 jobmru = cj;
702 return;
703 }
704 }
705 cj->next = jobmru;
706 jobmru = cj;
707}
708
709STATIC void
710deljob(struct job *j)
711{
712 struct job *jp, *prev;
713
714 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) {
715 if (jp == j) {
716 if (prev != NULL)
717 prev->next = jp->next;
718 else
719 jobmru = jp->next;
720 return;
721 }
722 }
723}
724
725/*
726 * Return the most recently used job that isn't `nj', and preferably one
727 * that is stopped.
728 */
729STATIC struct job *
730getcurjob(struct job *nj)
731{
732 struct job *jp;
733
734 /* Try to find a stopped one.. */
735 for (jp = jobmru; jp != NULL; jp = jp->next)
736 if (jp->used && jp != nj && jp->state == JOBSTOPPED)
737 return (jp);
738 /* Otherwise the most recently used job that isn't `nj' */
739 for (jp = jobmru; jp != NULL; jp = jp->next)
740 if (jp->used && jp != nj)
741 return (jp);
742
743 return (NULL);
744}
745
746#endif
747
748/*
749 * Fork of a subshell. If we are doing job control, give the subshell its
750 * own process group. Jp is a job structure that the job is to be added to.
751 * N is the command that will be evaluated by the child. Both jp and n may
752 * be NULL. The mode parameter can be one of the following:
753 * FORK_FG - Fork off a foreground process.
754 * FORK_BG - Fork off a background process.
755 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
756 * process group even if job control is on.
757 *
758 * When job control is turned off, background processes have their standard
759 * input redirected to /dev/null (except for the second and later processes
760 * in a pipeline).
761 */
762
763pid_t
764forkshell(struct job *jp, union node *n, int mode)
765{
766 pid_t pid;
767 pid_t pgrp;
768
| 684 jp - jobtab + 1));
685 return jp;
686}
687
688#if JOBS
689STATIC void
690setcurjob(struct job *cj)
691{
692 struct job *jp, *prev;
693
694 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) {
695 if (jp == cj) {
696 if (prev != NULL)
697 prev->next = jp->next;
698 else
699 jobmru = jp->next;
700 jp->next = jobmru;
701 jobmru = cj;
702 return;
703 }
704 }
705 cj->next = jobmru;
706 jobmru = cj;
707}
708
709STATIC void
710deljob(struct job *j)
711{
712 struct job *jp, *prev;
713
714 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) {
715 if (jp == j) {
716 if (prev != NULL)
717 prev->next = jp->next;
718 else
719 jobmru = jp->next;
720 return;
721 }
722 }
723}
724
725/*
726 * Return the most recently used job that isn't `nj', and preferably one
727 * that is stopped.
728 */
729STATIC struct job *
730getcurjob(struct job *nj)
731{
732 struct job *jp;
733
734 /* Try to find a stopped one.. */
735 for (jp = jobmru; jp != NULL; jp = jp->next)
736 if (jp->used && jp != nj && jp->state == JOBSTOPPED)
737 return (jp);
738 /* Otherwise the most recently used job that isn't `nj' */
739 for (jp = jobmru; jp != NULL; jp = jp->next)
740 if (jp->used && jp != nj)
741 return (jp);
742
743 return (NULL);
744}
745
746#endif
747
748/*
749 * Fork of a subshell. If we are doing job control, give the subshell its
750 * own process group. Jp is a job structure that the job is to be added to.
751 * N is the command that will be evaluated by the child. Both jp and n may
752 * be NULL. The mode parameter can be one of the following:
753 * FORK_FG - Fork off a foreground process.
754 * FORK_BG - Fork off a background process.
755 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
756 * process group even if job control is on.
757 *
758 * When job control is turned off, background processes have their standard
759 * input redirected to /dev/null (except for the second and later processes
760 * in a pipeline).
761 */
762
763pid_t
764forkshell(struct job *jp, union node *n, int mode)
765{
766 pid_t pid;
767 pid_t pgrp;
768
|
769 TRACE(("forkshell(%%%d, %p, %d) called\n", jp - jobtab, (void *)n,
| 769 TRACE(("forkshell(%%%td, %p, %d) called\n", jp - jobtab, (void *)n,
|
770 mode));
771 INTOFF;
772 if (mode == FORK_BG)
773 checkzombies();
774 flushall();
775 pid = fork();
776 if (pid == -1) {
777 TRACE(("Fork failed, errno=%d\n", errno));
778 INTON;
779 error("Cannot fork: %s", strerror(errno));
780 }
781 if (pid == 0) {
782 struct job *p;
783 int wasroot;
784 int i;
785
786 TRACE(("Child shell %d\n", (int)getpid()));
787 wasroot = rootshell;
788 rootshell = 0;
789 handler = &main_handler;
790 closescript();
791 INTON;
792 clear_traps();
793#if JOBS
794 jobctl = 0; /* do job control only in root shell */
795 if (wasroot && mode != FORK_NOJOB && mflag) {
796 if (jp == NULL || jp->nprocs == 0)
797 pgrp = getpid();
798 else
799 pgrp = jp->ps[0].pid;
800 if (setpgid(0, pgrp) == 0 && mode == FORK_FG) {
801 /*** this causes superfluous TIOCSPGRPS ***/
802 if (tcsetpgrp(ttyfd, pgrp) < 0)
803 error("tcsetpgrp failed, errno=%d", errno);
804 }
805 setsignal(SIGTSTP);
806 setsignal(SIGTTOU);
807 } else if (mode == FORK_BG) {
808 ignoresig(SIGINT);
809 ignoresig(SIGQUIT);
810 if ((jp == NULL || jp->nprocs == 0) &&
811 ! fd0_redirected_p ()) {
812 close(0);
813 if (open(_PATH_DEVNULL, O_RDONLY) != 0)
814 error("Can't open %s: %s",
815 _PATH_DEVNULL, strerror(errno));
816 }
817 }
818#else
819 if (mode == FORK_BG) {
820 ignoresig(SIGINT);
821 ignoresig(SIGQUIT);
822 if ((jp == NULL || jp->nprocs == 0) &&
823 ! fd0_redirected_p ()) {
824 close(0);
825 if (open(_PATH_DEVNULL, O_RDONLY) != 0)
826 error("Can't open %s: %s",
827 _PATH_DEVNULL, strerror(errno));
828 }
829 }
830#endif
831 INTOFF;
832 for (i = njobs, p = jobtab ; --i >= 0 ; p++)
833 if (p->used)
834 freejob(p);
835 INTON;
836 if (wasroot && iflag) {
837 setsignal(SIGINT);
838 setsignal(SIGQUIT);
839 setsignal(SIGTERM);
840 }
841 return pid;
842 }
843 if (rootshell && mode != FORK_NOJOB && mflag) {
844 if (jp == NULL || jp->nprocs == 0)
845 pgrp = pid;
846 else
847 pgrp = jp->ps[0].pid;
848 setpgid(pid, pgrp);
849 }
850 if (mode == FORK_BG) {
851 if (bgjob != NULL && bgjob->state == JOBDONE &&
852 !bgjob->remembered && !iflag)
853 freejob(bgjob);
854 backgndpid = pid; /* set $! */
855 bgjob = jp;
856 }
857 if (jp) {
858 struct procstat *ps = &jp->ps[jp->nprocs++];
859 ps->pid = pid;
860 ps->status = -1;
861 ps->cmd = nullstr;
862 if (iflag && rootshell && n)
863 ps->cmd = commandtext(n);
864 jp->foreground = mode == FORK_FG;
865#if JOBS
866 setcurjob(jp);
867#endif
868 }
869 INTON;
870 TRACE(("In parent shell: child = %d\n", (int)pid));
871 return pid;
872}
873
874
875
876/*
877 * Wait for job to finish.
878 *
879 * Under job control we have the problem that while a child process is
880 * running interrupts generated by the user are sent to the child but not
881 * to the shell. This means that an infinite loop started by an inter-
882 * active user may be hard to kill. With job control turned off, an
883 * interactive user may place an interactive program inside a loop. If
884 * the interactive program catches interrupts, the user doesn't want
885 * these interrupts to also abort the loop. The approach we take here
886 * is to have the shell ignore interrupt signals while waiting for a
887 * foreground process to terminate, and then send itself an interrupt
888 * signal if the child process was terminated by an interrupt signal.
889 * Unfortunately, some programs want to do a bit of cleanup and then
890 * exit on interrupt; unless these processes terminate themselves by
891 * sending a signal to themselves (instead of calling exit) they will
892 * confuse this approach.
893 */
894
895int
896waitforjob(struct job *jp, int *origstatus)
897{
898#if JOBS
899 pid_t mypgrp = getpgrp();
900 int propagate_int = jp->jobctl && jp->foreground;
901#endif
902 int status;
903 int st;
904
905 INTOFF;
| 770 mode));
771 INTOFF;
772 if (mode == FORK_BG)
773 checkzombies();
774 flushall();
775 pid = fork();
776 if (pid == -1) {
777 TRACE(("Fork failed, errno=%d\n", errno));
778 INTON;
779 error("Cannot fork: %s", strerror(errno));
780 }
781 if (pid == 0) {
782 struct job *p;
783 int wasroot;
784 int i;
785
786 TRACE(("Child shell %d\n", (int)getpid()));
787 wasroot = rootshell;
788 rootshell = 0;
789 handler = &main_handler;
790 closescript();
791 INTON;
792 clear_traps();
793#if JOBS
794 jobctl = 0; /* do job control only in root shell */
795 if (wasroot && mode != FORK_NOJOB && mflag) {
796 if (jp == NULL || jp->nprocs == 0)
797 pgrp = getpid();
798 else
799 pgrp = jp->ps[0].pid;
800 if (setpgid(0, pgrp) == 0 && mode == FORK_FG) {
801 /*** this causes superfluous TIOCSPGRPS ***/
802 if (tcsetpgrp(ttyfd, pgrp) < 0)
803 error("tcsetpgrp failed, errno=%d", errno);
804 }
805 setsignal(SIGTSTP);
806 setsignal(SIGTTOU);
807 } else if (mode == FORK_BG) {
808 ignoresig(SIGINT);
809 ignoresig(SIGQUIT);
810 if ((jp == NULL || jp->nprocs == 0) &&
811 ! fd0_redirected_p ()) {
812 close(0);
813 if (open(_PATH_DEVNULL, O_RDONLY) != 0)
814 error("Can't open %s: %s",
815 _PATH_DEVNULL, strerror(errno));
816 }
817 }
818#else
819 if (mode == FORK_BG) {
820 ignoresig(SIGINT);
821 ignoresig(SIGQUIT);
822 if ((jp == NULL || jp->nprocs == 0) &&
823 ! fd0_redirected_p ()) {
824 close(0);
825 if (open(_PATH_DEVNULL, O_RDONLY) != 0)
826 error("Can't open %s: %s",
827 _PATH_DEVNULL, strerror(errno));
828 }
829 }
830#endif
831 INTOFF;
832 for (i = njobs, p = jobtab ; --i >= 0 ; p++)
833 if (p->used)
834 freejob(p);
835 INTON;
836 if (wasroot && iflag) {
837 setsignal(SIGINT);
838 setsignal(SIGQUIT);
839 setsignal(SIGTERM);
840 }
841 return pid;
842 }
843 if (rootshell && mode != FORK_NOJOB && mflag) {
844 if (jp == NULL || jp->nprocs == 0)
845 pgrp = pid;
846 else
847 pgrp = jp->ps[0].pid;
848 setpgid(pid, pgrp);
849 }
850 if (mode == FORK_BG) {
851 if (bgjob != NULL && bgjob->state == JOBDONE &&
852 !bgjob->remembered && !iflag)
853 freejob(bgjob);
854 backgndpid = pid; /* set $! */
855 bgjob = jp;
856 }
857 if (jp) {
858 struct procstat *ps = &jp->ps[jp->nprocs++];
859 ps->pid = pid;
860 ps->status = -1;
861 ps->cmd = nullstr;
862 if (iflag && rootshell && n)
863 ps->cmd = commandtext(n);
864 jp->foreground = mode == FORK_FG;
865#if JOBS
866 setcurjob(jp);
867#endif
868 }
869 INTON;
870 TRACE(("In parent shell: child = %d\n", (int)pid));
871 return pid;
872}
873
874
875
876/*
877 * Wait for job to finish.
878 *
879 * Under job control we have the problem that while a child process is
880 * running interrupts generated by the user are sent to the child but not
881 * to the shell. This means that an infinite loop started by an inter-
882 * active user may be hard to kill. With job control turned off, an
883 * interactive user may place an interactive program inside a loop. If
884 * the interactive program catches interrupts, the user doesn't want
885 * these interrupts to also abort the loop. The approach we take here
886 * is to have the shell ignore interrupt signals while waiting for a
887 * foreground process to terminate, and then send itself an interrupt
888 * signal if the child process was terminated by an interrupt signal.
889 * Unfortunately, some programs want to do a bit of cleanup and then
890 * exit on interrupt; unless these processes terminate themselves by
891 * sending a signal to themselves (instead of calling exit) they will
892 * confuse this approach.
893 */
894
895int
896waitforjob(struct job *jp, int *origstatus)
897{
898#if JOBS
899 pid_t mypgrp = getpgrp();
900 int propagate_int = jp->jobctl && jp->foreground;
901#endif
902 int status;
903 int st;
904
905 INTOFF;
|
906 TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1));
| 906 TRACE(("waitforjob(%%%td) called\n", jp - jobtab + 1));
|
907 while (jp->state == 0)
908 if (dowait(1, jp) == -1)
909 dotrap();
910#if JOBS
911 if (jp->jobctl) {
912 if (tcsetpgrp(ttyfd, mypgrp) < 0)
913 error("tcsetpgrp failed, errno=%d\n", errno);
914 }
915 if (jp->state == JOBSTOPPED)
916 setcurjob(jp);
917#endif
918 status = jp->ps[jp->nprocs - 1].status;
919 if (origstatus != NULL)
920 *origstatus = status;
921 /* convert to 8 bits */
922 if (WIFEXITED(status))
923 st = WEXITSTATUS(status);
924#if JOBS
925 else if (WIFSTOPPED(status))
926 st = WSTOPSIG(status) + 128;
927#endif
928 else
929 st = WTERMSIG(status) + 128;
930 if (! JOBS || jp->state == JOBDONE)
931 freejob(jp);
932 if (int_pending()) {
933 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
934 kill(getpid(), SIGINT);
935 else
936 CLEAR_PENDING_INT;
937 }
938#if JOBS
939 else if (rootshell && iflag && propagate_int &&
940 WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
941 kill(getpid(), SIGINT);
942#endif
943 INTON;
944 return st;
945}
946
947
948
949/*
950 * Wait for a process to terminate.
951 */
952
953STATIC pid_t
954dowait(int block, struct job *job)
955{
956 pid_t pid;
957 int status;
958 struct procstat *sp;
959 struct job *jp;
960 struct job *thisjob;
961 int done;
962 int stopped;
963 int sig;
964 int i;
965
966 in_dowait++;
967 TRACE(("dowait(%d) called\n", block));
968 do {
969 pid = waitproc(block, &status);
970 TRACE(("wait returns %d, status=%d\n", (int)pid, status));
971 } while ((pid == -1 && errno == EINTR && breakwaitcmd == 0) ||
972 (pid > 0 && WIFSTOPPED(status) && !iflag));
973 in_dowait--;
974 if (pid == -1 && errno == ECHILD && job != NULL)
975 job->state = JOBDONE;
976 if (breakwaitcmd != 0) {
977 breakwaitcmd = 0;
978 if (pid <= 0)
979 return -1;
980 }
981 if (pid <= 0)
982 return pid;
983 INTOFF;
984 thisjob = NULL;
985 for (jp = jobtab ; jp < jobtab + njobs ; jp++) {
986 if (jp->used) {
987 done = 1;
988 stopped = 1;
989 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) {
990 if (sp->pid == -1)
991 continue;
992 if (sp->pid == pid) {
993 TRACE(("Changing status of proc %d from 0x%x to 0x%x\n",
994 (int)pid, sp->status,
995 status));
996 sp->status = status;
997 thisjob = jp;
998 }
999 if (sp->status == -1)
1000 stopped = 0;
1001 else if (WIFSTOPPED(sp->status))
1002 done = 0;
1003 }
1004 if (stopped) { /* stopped or done */
1005 int state = done? JOBDONE : JOBSTOPPED;
1006 if (jp->state != state) {
| 907 while (jp->state == 0)
908 if (dowait(1, jp) == -1)
909 dotrap();
910#if JOBS
911 if (jp->jobctl) {
912 if (tcsetpgrp(ttyfd, mypgrp) < 0)
913 error("tcsetpgrp failed, errno=%d\n", errno);
914 }
915 if (jp->state == JOBSTOPPED)
916 setcurjob(jp);
917#endif
918 status = jp->ps[jp->nprocs - 1].status;
919 if (origstatus != NULL)
920 *origstatus = status;
921 /* convert to 8 bits */
922 if (WIFEXITED(status))
923 st = WEXITSTATUS(status);
924#if JOBS
925 else if (WIFSTOPPED(status))
926 st = WSTOPSIG(status) + 128;
927#endif
928 else
929 st = WTERMSIG(status) + 128;
930 if (! JOBS || jp->state == JOBDONE)
931 freejob(jp);
932 if (int_pending()) {
933 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
934 kill(getpid(), SIGINT);
935 else
936 CLEAR_PENDING_INT;
937 }
938#if JOBS
939 else if (rootshell && iflag && propagate_int &&
940 WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
941 kill(getpid(), SIGINT);
942#endif
943 INTON;
944 return st;
945}
946
947
948
949/*
950 * Wait for a process to terminate.
951 */
952
953STATIC pid_t
954dowait(int block, struct job *job)
955{
956 pid_t pid;
957 int status;
958 struct procstat *sp;
959 struct job *jp;
960 struct job *thisjob;
961 int done;
962 int stopped;
963 int sig;
964 int i;
965
966 in_dowait++;
967 TRACE(("dowait(%d) called\n", block));
968 do {
969 pid = waitproc(block, &status);
970 TRACE(("wait returns %d, status=%d\n", (int)pid, status));
971 } while ((pid == -1 && errno == EINTR && breakwaitcmd == 0) ||
972 (pid > 0 && WIFSTOPPED(status) && !iflag));
973 in_dowait--;
974 if (pid == -1 && errno == ECHILD && job != NULL)
975 job->state = JOBDONE;
976 if (breakwaitcmd != 0) {
977 breakwaitcmd = 0;
978 if (pid <= 0)
979 return -1;
980 }
981 if (pid <= 0)
982 return pid;
983 INTOFF;
984 thisjob = NULL;
985 for (jp = jobtab ; jp < jobtab + njobs ; jp++) {
986 if (jp->used) {
987 done = 1;
988 stopped = 1;
989 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) {
990 if (sp->pid == -1)
991 continue;
992 if (sp->pid == pid) {
993 TRACE(("Changing status of proc %d from 0x%x to 0x%x\n",
994 (int)pid, sp->status,
995 status));
996 sp->status = status;
997 thisjob = jp;
998 }
999 if (sp->status == -1)
1000 stopped = 0;
1001 else if (WIFSTOPPED(sp->status))
1002 done = 0;
1003 }
1004 if (stopped) { /* stopped or done */
1005 int state = done? JOBDONE : JOBSTOPPED;
1006 if (jp->state != state) {
|
1007 TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state));
| 1007 TRACE(("Job %td: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state));
|
1008 jp->state = state;
1009 if (jp != job) {
1010 if (done && !jp->remembered &&
1011 !iflag && jp != bgjob)
1012 freejob(jp);
1013#if JOBS
1014 else if (done)
1015 deljob(jp);
1016#endif
1017 }
1018 }
1019 }
1020 }
1021 }
1022 INTON;
1023 if (! rootshell || ! iflag || (job && thisjob == job)) {
1024#if JOBS
1025 if (WIFSTOPPED(status))
1026 sig = WSTOPSIG(status);
1027 else
1028#endif
1029 {
1030 if (WIFEXITED(status))
1031 sig = 0;
1032 else
1033 sig = WTERMSIG(status);
1034 }
1035 if (sig != 0 && sig != SIGINT && sig != SIGPIPE) {
1036 if (!mflag ||
1037 (thisjob->foreground && !WIFSTOPPED(status))) {
1038 i = WTERMSIG(status);
1039 if ((i & 0x7F) < sys_nsig && sys_siglist[i & 0x7F])
1040 out1str(sys_siglist[i & 0x7F]);
1041 else
1042 out1fmt("Signal %d", i & 0x7F);
1043 if (WCOREDUMP(status))
1044 out1str(" (core dumped)");
1045 out1c('\n');
1046 } else
1047 showjob(thisjob, pid, SHOWJOBS_DEFAULT);
1048 }
1049 } else {
1050 TRACE(("Not printing status, rootshell=%d, job=%p\n", rootshell, job));
1051 if (thisjob)
1052 thisjob->changed = 1;
1053 }
1054 return pid;
1055}
1056
1057
1058
1059/*
1060 * Do a wait system call. If job control is compiled in, we accept
1061 * stopped processes. If block is zero, we return a value of zero
1062 * rather than blocking.
1063 */
1064STATIC pid_t
1065waitproc(int block, int *status)
1066{
1067 int flags;
1068
1069#if JOBS
1070 flags = WUNTRACED;
1071#else
1072 flags = 0;
1073#endif
1074 if (block == 0)
1075 flags |= WNOHANG;
1076 return wait3(status, flags, (struct rusage *)NULL);
1077}
1078
1079/*
1080 * return 1 if there are stopped jobs, otherwise 0
1081 */
1082int job_warning = 0;
1083int
1084stoppedjobs(void)
1085{
1086 int jobno;
1087 struct job *jp;
1088
1089 if (job_warning)
1090 return (0);
1091 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) {
1092 if (jp->used == 0)
1093 continue;
1094 if (jp->state == JOBSTOPPED) {
1095 out2fmt_flush("You have stopped jobs.\n");
1096 job_warning = 2;
1097 return (1);
1098 }
1099 }
1100
1101 return (0);
1102}
1103
1104
1105STATIC void
1106checkzombies(void)
1107{
1108 while (njobs > 0 && dowait(0, NULL) > 0)
1109 ;
1110}
1111
1112
1113int
1114backgndpidset(void)
1115{
1116 return backgndpid != -1;
1117}
1118
1119
1120pid_t
1121backgndpidval(void)
1122{
1123 if (bgjob != NULL)
1124 bgjob->remembered = 1;
1125 return backgndpid;
1126}
1127
1128/*
1129 * Return a string identifying a command (to be printed by the
1130 * jobs command.
1131 */
1132
1133static char *cmdnextc;
1134static int cmdnleft;
1135#define MAXCMDTEXT 200
1136
1137char *
1138commandtext(union node *n)
1139{
1140 char *name;
1141
1142 cmdnextc = name = ckmalloc(MAXCMDTEXT);
1143 cmdnleft = MAXCMDTEXT - 4;
1144 cmdtxt(n);
1145 *cmdnextc = '\0';
1146 return name;
1147}
1148
1149
1150STATIC void
1151cmdtxt(union node *n)
1152{
1153 union node *np;
1154 struct nodelist *lp;
1155 const char *p;
1156 int i;
1157 char s[2];
1158
1159 if (n == NULL)
1160 return;
1161 switch (n->type) {
1162 case NSEMI:
1163 cmdtxt(n->nbinary.ch1);
1164 cmdputs("; ");
1165 cmdtxt(n->nbinary.ch2);
1166 break;
1167 case NAND:
1168 cmdtxt(n->nbinary.ch1);
1169 cmdputs(" && ");
1170 cmdtxt(n->nbinary.ch2);
1171 break;
1172 case NOR:
1173 cmdtxt(n->nbinary.ch1);
1174 cmdputs(" || ");
1175 cmdtxt(n->nbinary.ch2);
1176 break;
1177 case NPIPE:
1178 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
1179 cmdtxt(lp->n);
1180 if (lp->next)
1181 cmdputs(" | ");
1182 }
1183 break;
1184 case NSUBSHELL:
1185 cmdputs("(");
1186 cmdtxt(n->nredir.n);
1187 cmdputs(")");
1188 break;
1189 case NREDIR:
1190 case NBACKGND:
1191 cmdtxt(n->nredir.n);
1192 break;
1193 case NIF:
1194 cmdputs("if ");
1195 cmdtxt(n->nif.test);
1196 cmdputs("; then ");
1197 cmdtxt(n->nif.ifpart);
1198 cmdputs("...");
1199 break;
1200 case NWHILE:
1201 cmdputs("while ");
1202 goto until;
1203 case NUNTIL:
1204 cmdputs("until ");
1205until:
1206 cmdtxt(n->nbinary.ch1);
1207 cmdputs("; do ");
1208 cmdtxt(n->nbinary.ch2);
1209 cmdputs("; done");
1210 break;
1211 case NFOR:
1212 cmdputs("for ");
1213 cmdputs(n->nfor.var);
1214 cmdputs(" in ...");
1215 break;
1216 case NCASE:
1217 cmdputs("case ");
1218 cmdputs(n->ncase.expr->narg.text);
1219 cmdputs(" in ...");
1220 break;
1221 case NDEFUN:
1222 cmdputs(n->narg.text);
1223 cmdputs("() ...");
1224 break;
1225 case NCMD:
1226 for (np = n->ncmd.args ; np ; np = np->narg.next) {
1227 cmdtxt(np);
1228 if (np->narg.next)
1229 cmdputs(" ");
1230 }
1231 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
1232 cmdputs(" ");
1233 cmdtxt(np);
1234 }
1235 break;
1236 case NARG:
1237 cmdputs(n->narg.text);
1238 break;
1239 case NTO:
1240 p = ">"; i = 1; goto redir;
1241 case NAPPEND:
1242 p = ">>"; i = 1; goto redir;
1243 case NTOFD:
1244 p = ">&"; i = 1; goto redir;
1245 case NCLOBBER:
1246 p = ">|"; i = 1; goto redir;
1247 case NFROM:
1248 p = "<"; i = 0; goto redir;
1249 case NFROMTO:
1250 p = "<>"; i = 0; goto redir;
1251 case NFROMFD:
1252 p = "<&"; i = 0; goto redir;
1253redir:
1254 if (n->nfile.fd != i) {
1255 s[0] = n->nfile.fd + '0';
1256 s[1] = '\0';
1257 cmdputs(s);
1258 }
1259 cmdputs(p);
1260 if (n->type == NTOFD || n->type == NFROMFD) {
1261 if (n->ndup.dupfd >= 0)
1262 s[0] = n->ndup.dupfd + '0';
1263 else
1264 s[0] = '-';
1265 s[1] = '\0';
1266 cmdputs(s);
1267 } else {
1268 cmdtxt(n->nfile.fname);
1269 }
1270 break;
1271 case NHERE:
1272 case NXHERE:
1273 cmdputs("<<...");
1274 break;
1275 default:
1276 cmdputs("???");
1277 break;
1278 }
1279}
1280
1281
1282
1283STATIC void
1284cmdputs(const char *s)
1285{
1286 const char *p;
1287 char *q;
1288 char c;
1289 int subtype = 0;
1290
1291 if (cmdnleft <= 0)
1292 return;
1293 p = s;
1294 q = cmdnextc;
1295 while ((c = *p++) != '\0') {
1296 if (c == CTLESC)
1297 *q++ = *p++;
1298 else if (c == CTLVAR) {
1299 *q++ = '$';
1300 if (--cmdnleft > 0)
1301 *q++ = '{';
1302 subtype = *p++;
1303 } else if (c == '=' && subtype != 0) {
1304 *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL];
1305 subtype = 0;
1306 } else if (c == CTLENDVAR) {
1307 *q++ = '}';
1308 } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE)
1309 cmdnleft++; /* ignore it */
1310 else
1311 *q++ = c;
1312 if (--cmdnleft <= 0) {
1313 *q++ = '.';
1314 *q++ = '.';
1315 *q++ = '.';
1316 break;
1317 }
1318 }
1319 cmdnextc = q;
1320}
| 1008 jp->state = state;
1009 if (jp != job) {
1010 if (done && !jp->remembered &&
1011 !iflag && jp != bgjob)
1012 freejob(jp);
1013#if JOBS
1014 else if (done)
1015 deljob(jp);
1016#endif
1017 }
1018 }
1019 }
1020 }
1021 }
1022 INTON;
1023 if (! rootshell || ! iflag || (job && thisjob == job)) {
1024#if JOBS
1025 if (WIFSTOPPED(status))
1026 sig = WSTOPSIG(status);
1027 else
1028#endif
1029 {
1030 if (WIFEXITED(status))
1031 sig = 0;
1032 else
1033 sig = WTERMSIG(status);
1034 }
1035 if (sig != 0 && sig != SIGINT && sig != SIGPIPE) {
1036 if (!mflag ||
1037 (thisjob->foreground && !WIFSTOPPED(status))) {
1038 i = WTERMSIG(status);
1039 if ((i & 0x7F) < sys_nsig && sys_siglist[i & 0x7F])
1040 out1str(sys_siglist[i & 0x7F]);
1041 else
1042 out1fmt("Signal %d", i & 0x7F);
1043 if (WCOREDUMP(status))
1044 out1str(" (core dumped)");
1045 out1c('\n');
1046 } else
1047 showjob(thisjob, pid, SHOWJOBS_DEFAULT);
1048 }
1049 } else {
1050 TRACE(("Not printing status, rootshell=%d, job=%p\n", rootshell, job));
1051 if (thisjob)
1052 thisjob->changed = 1;
1053 }
1054 return pid;
1055}
1056
1057
1058
1059/*
1060 * Do a wait system call. If job control is compiled in, we accept
1061 * stopped processes. If block is zero, we return a value of zero
1062 * rather than blocking.
1063 */
1064STATIC pid_t
1065waitproc(int block, int *status)
1066{
1067 int flags;
1068
1069#if JOBS
1070 flags = WUNTRACED;
1071#else
1072 flags = 0;
1073#endif
1074 if (block == 0)
1075 flags |= WNOHANG;
1076 return wait3(status, flags, (struct rusage *)NULL);
1077}
1078
1079/*
1080 * return 1 if there are stopped jobs, otherwise 0
1081 */
1082int job_warning = 0;
1083int
1084stoppedjobs(void)
1085{
1086 int jobno;
1087 struct job *jp;
1088
1089 if (job_warning)
1090 return (0);
1091 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) {
1092 if (jp->used == 0)
1093 continue;
1094 if (jp->state == JOBSTOPPED) {
1095 out2fmt_flush("You have stopped jobs.\n");
1096 job_warning = 2;
1097 return (1);
1098 }
1099 }
1100
1101 return (0);
1102}
1103
1104
1105STATIC void
1106checkzombies(void)
1107{
1108 while (njobs > 0 && dowait(0, NULL) > 0)
1109 ;
1110}
1111
1112
1113int
1114backgndpidset(void)
1115{
1116 return backgndpid != -1;
1117}
1118
1119
1120pid_t
1121backgndpidval(void)
1122{
1123 if (bgjob != NULL)
1124 bgjob->remembered = 1;
1125 return backgndpid;
1126}
1127
1128/*
1129 * Return a string identifying a command (to be printed by the
1130 * jobs command.
1131 */
1132
1133static char *cmdnextc;
1134static int cmdnleft;
1135#define MAXCMDTEXT 200
1136
1137char *
1138commandtext(union node *n)
1139{
1140 char *name;
1141
1142 cmdnextc = name = ckmalloc(MAXCMDTEXT);
1143 cmdnleft = MAXCMDTEXT - 4;
1144 cmdtxt(n);
1145 *cmdnextc = '\0';
1146 return name;
1147}
1148
1149
1150STATIC void
1151cmdtxt(union node *n)
1152{
1153 union node *np;
1154 struct nodelist *lp;
1155 const char *p;
1156 int i;
1157 char s[2];
1158
1159 if (n == NULL)
1160 return;
1161 switch (n->type) {
1162 case NSEMI:
1163 cmdtxt(n->nbinary.ch1);
1164 cmdputs("; ");
1165 cmdtxt(n->nbinary.ch2);
1166 break;
1167 case NAND:
1168 cmdtxt(n->nbinary.ch1);
1169 cmdputs(" && ");
1170 cmdtxt(n->nbinary.ch2);
1171 break;
1172 case NOR:
1173 cmdtxt(n->nbinary.ch1);
1174 cmdputs(" || ");
1175 cmdtxt(n->nbinary.ch2);
1176 break;
1177 case NPIPE:
1178 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
1179 cmdtxt(lp->n);
1180 if (lp->next)
1181 cmdputs(" | ");
1182 }
1183 break;
1184 case NSUBSHELL:
1185 cmdputs("(");
1186 cmdtxt(n->nredir.n);
1187 cmdputs(")");
1188 break;
1189 case NREDIR:
1190 case NBACKGND:
1191 cmdtxt(n->nredir.n);
1192 break;
1193 case NIF:
1194 cmdputs("if ");
1195 cmdtxt(n->nif.test);
1196 cmdputs("; then ");
1197 cmdtxt(n->nif.ifpart);
1198 cmdputs("...");
1199 break;
1200 case NWHILE:
1201 cmdputs("while ");
1202 goto until;
1203 case NUNTIL:
1204 cmdputs("until ");
1205until:
1206 cmdtxt(n->nbinary.ch1);
1207 cmdputs("; do ");
1208 cmdtxt(n->nbinary.ch2);
1209 cmdputs("; done");
1210 break;
1211 case NFOR:
1212 cmdputs("for ");
1213 cmdputs(n->nfor.var);
1214 cmdputs(" in ...");
1215 break;
1216 case NCASE:
1217 cmdputs("case ");
1218 cmdputs(n->ncase.expr->narg.text);
1219 cmdputs(" in ...");
1220 break;
1221 case NDEFUN:
1222 cmdputs(n->narg.text);
1223 cmdputs("() ...");
1224 break;
1225 case NCMD:
1226 for (np = n->ncmd.args ; np ; np = np->narg.next) {
1227 cmdtxt(np);
1228 if (np->narg.next)
1229 cmdputs(" ");
1230 }
1231 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
1232 cmdputs(" ");
1233 cmdtxt(np);
1234 }
1235 break;
1236 case NARG:
1237 cmdputs(n->narg.text);
1238 break;
1239 case NTO:
1240 p = ">"; i = 1; goto redir;
1241 case NAPPEND:
1242 p = ">>"; i = 1; goto redir;
1243 case NTOFD:
1244 p = ">&"; i = 1; goto redir;
1245 case NCLOBBER:
1246 p = ">|"; i = 1; goto redir;
1247 case NFROM:
1248 p = "<"; i = 0; goto redir;
1249 case NFROMTO:
1250 p = "<>"; i = 0; goto redir;
1251 case NFROMFD:
1252 p = "<&"; i = 0; goto redir;
1253redir:
1254 if (n->nfile.fd != i) {
1255 s[0] = n->nfile.fd + '0';
1256 s[1] = '\0';
1257 cmdputs(s);
1258 }
1259 cmdputs(p);
1260 if (n->type == NTOFD || n->type == NFROMFD) {
1261 if (n->ndup.dupfd >= 0)
1262 s[0] = n->ndup.dupfd + '0';
1263 else
1264 s[0] = '-';
1265 s[1] = '\0';
1266 cmdputs(s);
1267 } else {
1268 cmdtxt(n->nfile.fname);
1269 }
1270 break;
1271 case NHERE:
1272 case NXHERE:
1273 cmdputs("<<...");
1274 break;
1275 default:
1276 cmdputs("???");
1277 break;
1278 }
1279}
1280
1281
1282
1283STATIC void
1284cmdputs(const char *s)
1285{
1286 const char *p;
1287 char *q;
1288 char c;
1289 int subtype = 0;
1290
1291 if (cmdnleft <= 0)
1292 return;
1293 p = s;
1294 q = cmdnextc;
1295 while ((c = *p++) != '\0') {
1296 if (c == CTLESC)
1297 *q++ = *p++;
1298 else if (c == CTLVAR) {
1299 *q++ = '$';
1300 if (--cmdnleft > 0)
1301 *q++ = '{';
1302 subtype = *p++;
1303 } else if (c == '=' && subtype != 0) {
1304 *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL];
1305 subtype = 0;
1306 } else if (c == CTLENDVAR) {
1307 *q++ = '}';
1308 } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE)
1309 cmdnleft++; /* ignore it */
1310 else
1311 *q++ = c;
1312 if (--cmdnleft <= 0) {
1313 *q++ = '.';
1314 *q++ = '.';
1315 *q++ = '.';
1316 break;
1317 }
1318 }
1319 cmdnextc = q;
1320}
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