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jobs.c (200998) jobs.c (201053)
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 200998 2009-12-25 20:21:35Z jilles $");
39__FBSDID("$FreeBSD: head/bin/sh/jobs.c 201053 2009-12-27 18:04:05Z jilles $");
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>
47#include <sys/param.h>
48#include <sys/wait.h>
49#include <sys/time.h>
50#include <sys/resource.h>
51#include <paths.h>
52#include <sys/ioctl.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 */
78#if JOBS
79STATIC struct job *jobmru; /* most recently used job list */
80STATIC pid_t initialpgrp; /* pgrp of shell on invocation */
81#endif
82int in_waitcmd = 0; /* are we in waitcmd()? */
83int in_dowait = 0; /* are we in dowait()? */
84volatile sig_atomic_t breakwaitcmd = 0; /* should wait be terminated? */
85static int ttyfd = -1;
86
87#if JOBS
88STATIC void restartjob(struct job *);
89#endif
90STATIC void freejob(struct job *);
91STATIC struct job *getjob(char *);
92STATIC pid_t dowait(int, struct job *);
93STATIC pid_t waitproc(int, int *);
94STATIC void cmdtxt(union node *);
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>
47#include <sys/param.h>
48#include <sys/wait.h>
49#include <sys/time.h>
50#include <sys/resource.h>
51#include <paths.h>
52#include <sys/ioctl.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 */
78#if JOBS
79STATIC struct job *jobmru; /* most recently used job list */
80STATIC pid_t initialpgrp; /* pgrp of shell on invocation */
81#endif
82int in_waitcmd = 0; /* are we in waitcmd()? */
83int in_dowait = 0; /* are we in dowait()? */
84volatile sig_atomic_t breakwaitcmd = 0; /* should wait be terminated? */
85static int ttyfd = -1;
86
87#if JOBS
88STATIC void restartjob(struct job *);
89#endif
90STATIC void freejob(struct job *);
91STATIC struct job *getjob(char *);
92STATIC pid_t dowait(int, struct job *);
93STATIC pid_t waitproc(int, int *);
94STATIC void cmdtxt(union node *);
95STATIC void cmdputs(char *);
95STATIC void cmdputs(const char *);
96#if JOBS
97STATIC void setcurjob(struct job *);
98STATIC void deljob(struct job *);
99STATIC struct job *getcurjob(struct job *);
100#endif
101STATIC void showjob(struct job *, pid_t, int);
102
103
104/*
105 * Turn job control on and off.
106 */
107
108MKINIT int jobctl;
109
110#if JOBS
111void
112setjobctl(int on)
113{
114 int i;
115
116 if (on == jobctl || rootshell == 0)
117 return;
118 if (on) {
119 if (ttyfd != -1)
120 close(ttyfd);
121 if ((ttyfd = open(_PATH_TTY, O_RDWR)) < 0) {
122 i = 0;
123 while (i <= 2 && !isatty(i))
124 i++;
125 if (i > 2 || (ttyfd = fcntl(i, F_DUPFD, 10)) < 0)
126 goto out;
127 }
128 if (ttyfd < 10) {
129 /*
130 * Keep our TTY file descriptor out of the way of
131 * the user's redirections.
132 */
133 if ((i = fcntl(ttyfd, F_DUPFD, 10)) < 0) {
134 close(ttyfd);
135 ttyfd = -1;
136 goto out;
137 }
138 close(ttyfd);
139 ttyfd = i;
140 }
141 if (fcntl(ttyfd, F_SETFD, FD_CLOEXEC) < 0) {
142 close(ttyfd);
143 ttyfd = -1;
144 goto out;
145 }
146 do { /* while we are in the background */
147 initialpgrp = tcgetpgrp(ttyfd);
148 if (initialpgrp < 0) {
149out: out2fmt_flush("sh: can't access tty; job control turned off\n");
150 mflag = 0;
151 return;
152 }
153 if (initialpgrp == -1)
154 initialpgrp = getpgrp();
155 else if (initialpgrp != getpgrp()) {
156 killpg(0, SIGTTIN);
157 continue;
158 }
159 } while (0);
160 setsignal(SIGTSTP);
161 setsignal(SIGTTOU);
162 setsignal(SIGTTIN);
163 setpgid(0, rootpid);
164 tcsetpgrp(ttyfd, rootpid);
165 } else { /* turning job control off */
166 setpgid(0, initialpgrp);
167 tcsetpgrp(ttyfd, initialpgrp);
168 close(ttyfd);
169 ttyfd = -1;
170 setsignal(SIGTSTP);
171 setsignal(SIGTTOU);
172 setsignal(SIGTTIN);
173 }
174 jobctl = on;
175}
176#endif
177
178
179#ifdef mkinit
180INCLUDE <sys/types.h>
181INCLUDE <stdlib.h>
182
183SHELLPROC {
184 backgndpid = -1;
185#if JOBS
186 jobctl = 0;
187#endif
188}
189
190#endif
191
192
193
194#if JOBS
195int
196fgcmd(int argc __unused, char **argv)
197{
198 struct job *jp;
199 pid_t pgrp;
200 int status;
201
202 jp = getjob(argv[1]);
203 if (jp->jobctl == 0)
204 error("job not created under job control");
205 out1str(jp->ps[0].cmd);
206 out1c('\n');
207 flushout(&output);
208 pgrp = jp->ps[0].pid;
209 tcsetpgrp(ttyfd, pgrp);
210 restartjob(jp);
211 jp->foreground = 1;
212 INTOFF;
213 status = waitforjob(jp, (int *)NULL);
214 INTON;
215 return status;
216}
217
218
219int
220bgcmd(int argc, char **argv)
221{
222 char s[64];
223 struct job *jp;
224
225 do {
226 jp = getjob(*++argv);
227 if (jp->jobctl == 0)
228 error("job not created under job control");
229 if (jp->state == JOBDONE)
230 continue;
231 restartjob(jp);
232 jp->foreground = 0;
233 fmtstr(s, 64, "[%td] ", jp - jobtab + 1);
234 out1str(s);
235 out1str(jp->ps[0].cmd);
236 out1c('\n');
237 } while (--argc > 1);
238 return 0;
239}
240
241
242STATIC void
243restartjob(struct job *jp)
244{
245 struct procstat *ps;
246 int i;
247
248 if (jp->state == JOBDONE)
249 return;
250 setcurjob(jp);
251 INTOFF;
252 killpg(jp->ps[0].pid, SIGCONT);
253 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
254 if (WIFSTOPPED(ps->status)) {
255 ps->status = -1;
256 jp->state = 0;
257 }
258 }
259 INTON;
260}
261#endif
262
263
264int
265jobscmd(int argc, char *argv[])
266{
267 char *id;
268 int ch, mode;
269
270 optind = optreset = 1;
271 opterr = 0;
272 mode = SHOWJOBS_DEFAULT;
273 while ((ch = getopt(argc, argv, "lps")) != -1) {
274 switch (ch) {
275 case 'l':
276 mode = SHOWJOBS_VERBOSE;
277 break;
278 case 'p':
279 mode = SHOWJOBS_PGIDS;
280 break;
281 case 's':
282 mode = SHOWJOBS_PIDS;
283 break;
284 case '?':
285 default:
286 error("unknown option: -%c", optopt);
287 }
288 }
289 argc -= optind;
290 argv += optind;
291
292 if (argc == 0)
293 showjobs(0, mode);
294 else
295 while ((id = *argv++) != NULL)
296 showjob(getjob(id), 0, mode);
297
298 return (0);
299}
300
301STATIC void
302showjob(struct job *jp, pid_t pid, int mode)
303{
304 char s[64];
305 struct procstat *ps;
306 struct job *j;
307 int col, curr, i, jobno, prev, procno;
308 pid_t ppid;
309 char c;
310
311 procno = (mode == SHOWJOBS_PGIDS) ? 1 : jp->nprocs;
312 jobno = jp - jobtab + 1;
313 curr = prev = 0;
314#if JOBS
315 if ((j = getcurjob(NULL)) != NULL) {
316 curr = j - jobtab + 1;
317 if ((j = getcurjob(j)) != NULL)
318 prev = j - jobtab + 1;
319 }
320#endif
321 for (ps = jp->ps ; ; ps++) { /* for each process */
322 if (mode == SHOWJOBS_PIDS || mode == SHOWJOBS_PGIDS) {
323 ppid = (mode == SHOWJOBS_PIDS) ? ps->pid :
324 getpgid(ps->pid);
325 out1fmt("%d\n", (int)ppid);
326 goto skip;
327 }
328 if (mode != SHOWJOBS_VERBOSE && ps != jp->ps && pid == 0)
329 goto skip;
330 if (pid != 0 && pid != ps->pid)
331 goto skip;
332 if (jobno == curr && ps == jp->ps)
333 c = '+';
334 else if (jobno == prev && ps == jp->ps)
335 c = '-';
336 else
337 c = ' ';
338 if (ps == jp->ps)
339 fmtstr(s, 64, "[%d] %c ", jobno, c);
340 else
341 fmtstr(s, 64, " %c ", c);
342 out1str(s);
343 col = strlen(s);
344 if (mode == SHOWJOBS_VERBOSE) {
345 fmtstr(s, 64, "%d ", (int)ps->pid);
346 out1str(s);
347 col += strlen(s);
348 }
349 s[0] = '\0';
350 if (ps != jp->ps) {
351 *s = '\0';
352 } else if (ps->status == -1) {
353 strcpy(s, "Running");
354 } else if (WIFEXITED(ps->status)) {
355 if (WEXITSTATUS(ps->status) == 0)
356 strcpy(s, "Done");
357 else
358 fmtstr(s, 64, "Done (%d)",
359 WEXITSTATUS(ps->status));
360 } else {
361#if JOBS
362 if (WIFSTOPPED(ps->status))
363 i = WSTOPSIG(ps->status);
364 else
365#endif
366 i = WTERMSIG(ps->status);
367 if ((i & 0x7F) < sys_nsig && sys_siglist[i & 0x7F])
368 scopy(sys_siglist[i & 0x7F], s);
369 else
370 fmtstr(s, 64, "Signal %d", i & 0x7F);
371 if (WCOREDUMP(ps->status))
372 strcat(s, " (core dumped)");
373 }
374 out1str(s);
375 col += strlen(s);
376 do {
377 out1c(' ');
378 col++;
379 } while (col < 30);
380 out1str(ps->cmd);
381 out1c('\n');
382skip: if (--procno <= 0)
383 break;
384 }
385}
386
387/*
388 * Print a list of jobs. If "change" is nonzero, only print jobs whose
389 * statuses have changed since the last call to showjobs.
390 *
391 * If the shell is interrupted in the process of creating a job, the
392 * result may be a job structure containing zero processes. Such structures
393 * will be freed here.
394 */
395
396void
397showjobs(int change, int mode)
398{
399 int jobno;
400 struct job *jp;
401
402 TRACE(("showjobs(%d) called\n", change));
403 while (dowait(0, (struct job *)NULL) > 0);
404 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) {
405 if (! jp->used)
406 continue;
407 if (jp->nprocs == 0) {
408 freejob(jp);
409 continue;
410 }
411 if (change && ! jp->changed)
412 continue;
413 showjob(jp, 0, mode);
414 jp->changed = 0;
415 if (jp->state == JOBDONE) {
416 freejob(jp);
417 }
418 }
419}
420
421
422/*
423 * Mark a job structure as unused.
424 */
425
426STATIC void
427freejob(struct job *jp)
428{
429 struct procstat *ps;
430 int i;
431
432 INTOFF;
433 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
434 if (ps->cmd != nullstr)
435 ckfree(ps->cmd);
436 }
437 if (jp->ps != &jp->ps0)
438 ckfree(jp->ps);
439 jp->used = 0;
440#if JOBS
441 deljob(jp);
442#endif
443 INTON;
444}
445
446
447
448int
449waitcmd(int argc, char **argv)
450{
451 struct job *job;
452 int status, retval;
453 struct job *jp;
454
455 if (argc > 1) {
456 job = getjob(argv[1]);
457 } else {
458 job = NULL;
459 }
460
461 /*
462 * Loop until a process is terminated or stopped, or a SIGINT is
463 * received.
464 */
465
466 in_waitcmd++;
467 do {
468 if (job != NULL) {
469 if (job->state) {
470 status = job->ps[job->nprocs - 1].status;
471 if (WIFEXITED(status))
472 retval = WEXITSTATUS(status);
473#if JOBS
474 else if (WIFSTOPPED(status))
475 retval = WSTOPSIG(status) + 128;
476#endif
477 else
478 retval = WTERMSIG(status) + 128;
479 if (! iflag)
480 freejob(job);
481 in_waitcmd--;
482 return retval;
483 }
484 } else {
485 for (jp = jobtab ; ; jp++) {
486 if (jp >= jobtab + njobs) { /* no running procs */
487 in_waitcmd--;
488 return 0;
489 }
490 if (jp->used && jp->state == 0)
491 break;
492 }
493 }
494 } while (dowait(1, (struct job *)NULL) != -1);
495 in_waitcmd--;
496
497 return 0;
498}
499
500
501
502int
503jobidcmd(int argc __unused, char **argv)
504{
505 struct job *jp;
506 int i;
507
508 jp = getjob(argv[1]);
509 for (i = 0 ; i < jp->nprocs ; ) {
510 out1fmt("%d", (int)jp->ps[i].pid);
511 out1c(++i < jp->nprocs? ' ' : '\n');
512 }
513 return 0;
514}
515
516
517
518/*
519 * Convert a job name to a job structure.
520 */
521
522STATIC struct job *
523getjob(char *name)
524{
525 int jobno;
526 struct job *found, *jp;
527 pid_t pid;
528 int i;
529
530 if (name == NULL) {
531#if JOBS
532currentjob: if ((jp = getcurjob(NULL)) == NULL)
533 error("No current job");
534 return (jp);
535#else
536 error("No current job");
537#endif
538 } else if (name[0] == '%') {
539 if (is_digit(name[1])) {
540 jobno = number(name + 1);
541 if (jobno > 0 && jobno <= njobs
542 && jobtab[jobno - 1].used != 0)
543 return &jobtab[jobno - 1];
544#if JOBS
545 } else if (name[1] == '%' && name[2] == '\0') {
546 goto currentjob;
547 } else if (name[1] == '+' && name[2] == '\0') {
548 goto currentjob;
549 } else if (name[1] == '-' && name[2] == '\0') {
550 if ((jp = getcurjob(NULL)) == NULL ||
551 (jp = getcurjob(jp)) == NULL)
552 error("No previous job");
553 return (jp);
554#endif
555 } else if (name[1] == '?') {
556 found = NULL;
557 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
558 if (jp->used && jp->nprocs > 0
559 && strstr(jp->ps[0].cmd, name + 2) != NULL) {
560 if (found)
561 error("%s: ambiguous", name);
562 found = jp;
563 }
564 }
565 if (found != NULL)
566 return (found);
567 } else {
568 found = NULL;
569 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
570 if (jp->used && jp->nprocs > 0
571 && prefix(name + 1, jp->ps[0].cmd)) {
572 if (found)
573 error("%s: ambiguous", name);
574 found = jp;
575 }
576 }
577 if (found)
578 return found;
579 }
580 } else if (is_number(name)) {
581 pid = (pid_t)number(name);
582 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
583 if (jp->used && jp->nprocs > 0
584 && jp->ps[jp->nprocs - 1].pid == pid)
585 return jp;
586 }
587 }
588 error("No such job: %s", name);
589 /*NOTREACHED*/
590 return NULL;
591}
592
593
594
595/*
596 * Return a new job structure,
597 */
598
599struct job *
600makejob(union node *node __unused, int nprocs)
601{
602 int i;
603 struct job *jp;
604
605 for (i = njobs, jp = jobtab ; ; jp++) {
606 if (--i < 0) {
607 INTOFF;
608 if (njobs == 0) {
609 jobtab = ckmalloc(4 * sizeof jobtab[0]);
610#if JOBS
611 jobmru = NULL;
612#endif
613 } else {
614 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]);
615 memcpy(jp, jobtab, njobs * sizeof jp[0]);
616#if JOBS
617 /* Relocate `next' pointers and list head */
618 if (jobmru != NULL)
619 jobmru = &jp[jobmru - jobtab];
620 for (i = 0; i < njobs; i++)
621 if (jp[i].next != NULL)
622 jp[i].next = &jp[jp[i].next -
623 jobtab];
624#endif
625 /* Relocate `ps' pointers */
626 for (i = 0; i < njobs; i++)
627 if (jp[i].ps == &jobtab[i].ps0)
628 jp[i].ps = &jp[i].ps0;
629 ckfree(jobtab);
630 jobtab = jp;
631 }
632 jp = jobtab + njobs;
633 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0);
634 INTON;
635 break;
636 }
637 if (jp->used == 0)
638 break;
639 }
640 INTOFF;
641 jp->state = 0;
642 jp->used = 1;
643 jp->changed = 0;
644 jp->nprocs = 0;
645 jp->foreground = 0;
646#if JOBS
647 jp->jobctl = jobctl;
648 jp->next = NULL;
649#endif
650 if (nprocs > 1) {
651 jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
652 } else {
653 jp->ps = &jp->ps0;
654 }
655 INTON;
656 TRACE(("makejob(%p, %d) returns %%%d\n", (void *)node, nprocs,
657 jp - jobtab + 1));
658 return jp;
659}
660
661#if JOBS
662STATIC void
663setcurjob(struct job *cj)
664{
665 struct job *jp, *prev;
666
667 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) {
668 if (jp == cj) {
669 if (prev != NULL)
670 prev->next = jp->next;
671 else
672 jobmru = jp->next;
673 jp->next = jobmru;
674 jobmru = cj;
675 return;
676 }
677 }
678 cj->next = jobmru;
679 jobmru = cj;
680}
681
682STATIC void
683deljob(struct job *j)
684{
685 struct job *jp, *prev;
686
687 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) {
688 if (jp == j) {
689 if (prev != NULL)
690 prev->next = jp->next;
691 else
692 jobmru = jp->next;
693 return;
694 }
695 }
696}
697
698/*
699 * Return the most recently used job that isn't `nj', and preferably one
700 * that is stopped.
701 */
702STATIC struct job *
703getcurjob(struct job *nj)
704{
705 struct job *jp;
706
707 /* Try to find a stopped one.. */
708 for (jp = jobmru; jp != NULL; jp = jp->next)
709 if (jp->used && jp != nj && jp->state == JOBSTOPPED)
710 return (jp);
711 /* Otherwise the most recently used job that isn't `nj' */
712 for (jp = jobmru; jp != NULL; jp = jp->next)
713 if (jp->used && jp != nj)
714 return (jp);
715
716 return (NULL);
717}
718
719#endif
720
721/*
722 * Fork of a subshell. If we are doing job control, give the subshell its
723 * own process group. Jp is a job structure that the job is to be added to.
724 * N is the command that will be evaluated by the child. Both jp and n may
725 * be NULL. The mode parameter can be one of the following:
726 * FORK_FG - Fork off a foreground process.
727 * FORK_BG - Fork off a background process.
728 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
729 * process group even if job control is on.
730 *
731 * When job control is turned off, background processes have their standard
732 * input redirected to /dev/null (except for the second and later processes
733 * in a pipeline).
734 */
735
736pid_t
737forkshell(struct job *jp, union node *n, int mode)
738{
739 pid_t pid;
740 pid_t pgrp;
741
742 TRACE(("forkshell(%%%d, %p, %d) called\n", jp - jobtab, (void *)n,
743 mode));
744 INTOFF;
745 flushall();
746 pid = fork();
747 if (pid == -1) {
748 TRACE(("Fork failed, errno=%d\n", errno));
749 INTON;
750 error("Cannot fork: %s", strerror(errno));
751 }
752 if (pid == 0) {
753 struct job *p;
754 int wasroot;
755 int i;
756
757 TRACE(("Child shell %d\n", (int)getpid()));
758 wasroot = rootshell;
759 rootshell = 0;
760 handler = &main_handler;
761 closescript();
762 INTON;
763 clear_traps();
764#if JOBS
765 jobctl = 0; /* do job control only in root shell */
766 if (wasroot && mode != FORK_NOJOB && mflag) {
767 if (jp == NULL || jp->nprocs == 0)
768 pgrp = getpid();
769 else
770 pgrp = jp->ps[0].pid;
771 if (setpgid(0, pgrp) == 0 && mode == FORK_FG) {
772 /*** this causes superfluous TIOCSPGRPS ***/
773 if (tcsetpgrp(ttyfd, pgrp) < 0)
774 error("tcsetpgrp failed, errno=%d", errno);
775 }
776 setsignal(SIGTSTP);
777 setsignal(SIGTTOU);
778 } else if (mode == FORK_BG) {
779 ignoresig(SIGINT);
780 ignoresig(SIGQUIT);
781 if ((jp == NULL || jp->nprocs == 0) &&
782 ! fd0_redirected_p ()) {
783 close(0);
784 if (open(_PATH_DEVNULL, O_RDONLY) != 0)
785 error("Can't open %s: %s",
786 _PATH_DEVNULL, strerror(errno));
787 }
788 }
789#else
790 if (mode == FORK_BG) {
791 ignoresig(SIGINT);
792 ignoresig(SIGQUIT);
793 if ((jp == NULL || jp->nprocs == 0) &&
794 ! fd0_redirected_p ()) {
795 close(0);
796 if (open(_PATH_DEVNULL, O_RDONLY) != 0)
797 error("Can't open %s: %s",
798 _PATH_DEVNULL, strerror(errno));
799 }
800 }
801#endif
802 INTOFF;
803 for (i = njobs, p = jobtab ; --i >= 0 ; p++)
804 if (p->used)
805 freejob(p);
806 INTON;
807 if (wasroot && iflag) {
808 setsignal(SIGINT);
809 setsignal(SIGQUIT);
810 setsignal(SIGTERM);
811 }
812 return pid;
813 }
814 if (rootshell && mode != FORK_NOJOB && mflag) {
815 if (jp == NULL || jp->nprocs == 0)
816 pgrp = pid;
817 else
818 pgrp = jp->ps[0].pid;
819 setpgid(pid, pgrp);
820 }
821 if (mode == FORK_BG)
822 backgndpid = pid; /* set $! */
823 if (jp) {
824 struct procstat *ps = &jp->ps[jp->nprocs++];
825 ps->pid = pid;
826 ps->status = -1;
827 ps->cmd = nullstr;
828 if (iflag && rootshell && n)
829 ps->cmd = commandtext(n);
830 jp->foreground = mode == FORK_FG;
831#if JOBS
832 setcurjob(jp);
833#endif
834 }
835 INTON;
836 TRACE(("In parent shell: child = %d\n", (int)pid));
837 return pid;
838}
839
840
841
842/*
843 * Wait for job to finish.
844 *
845 * Under job control we have the problem that while a child process is
846 * running interrupts generated by the user are sent to the child but not
847 * to the shell. This means that an infinite loop started by an inter-
848 * active user may be hard to kill. With job control turned off, an
849 * interactive user may place an interactive program inside a loop. If
850 * the interactive program catches interrupts, the user doesn't want
851 * these interrupts to also abort the loop. The approach we take here
852 * is to have the shell ignore interrupt signals while waiting for a
853 * foreground process to terminate, and then send itself an interrupt
854 * signal if the child process was terminated by an interrupt signal.
855 * Unfortunately, some programs want to do a bit of cleanup and then
856 * exit on interrupt; unless these processes terminate themselves by
857 * sending a signal to themselves (instead of calling exit) they will
858 * confuse this approach.
859 */
860
861int
862waitforjob(struct job *jp, int *origstatus)
863{
864#if JOBS
865 pid_t mypgrp = getpgrp();
866#endif
867 int status;
868 int st;
869
870 INTOFF;
871 TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1));
872 while (jp->state == 0)
873 if (dowait(1, jp) == -1)
874 dotrap();
875#if JOBS
876 if (jp->jobctl) {
877 if (tcsetpgrp(ttyfd, mypgrp) < 0)
878 error("tcsetpgrp failed, errno=%d\n", errno);
879 }
880 if (jp->state == JOBSTOPPED)
881 setcurjob(jp);
882#endif
883 status = jp->ps[jp->nprocs - 1].status;
884 if (origstatus != NULL)
885 *origstatus = status;
886 /* convert to 8 bits */
887 if (WIFEXITED(status))
888 st = WEXITSTATUS(status);
889#if JOBS
890 else if (WIFSTOPPED(status))
891 st = WSTOPSIG(status) + 128;
892#endif
893 else
894 st = WTERMSIG(status) + 128;
895 if (! JOBS || jp->state == JOBDONE)
896 freejob(jp);
897 if (int_pending()) {
898 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
899 kill(getpid(), SIGINT);
900 else
901 CLEAR_PENDING_INT;
902 }
903 INTON;
904 return st;
905}
906
907
908
909/*
910 * Wait for a process to terminate.
911 */
912
913STATIC pid_t
914dowait(int block, struct job *job)
915{
916 pid_t pid;
917 int status;
918 struct procstat *sp;
919 struct job *jp;
920 struct job *thisjob;
921 int done;
922 int stopped;
923 int sig;
924 int i;
925
926 in_dowait++;
927 TRACE(("dowait(%d) called\n", block));
928 do {
929 pid = waitproc(block, &status);
930 TRACE(("wait returns %d, status=%d\n", (int)pid, status));
931 } while ((pid == -1 && errno == EINTR && breakwaitcmd == 0) ||
932 (pid > 0 && WIFSTOPPED(status) && !iflag));
933 in_dowait--;
934 if (pid == -1 && errno == ECHILD && job != NULL)
935 job->state = JOBDONE;
936 if (breakwaitcmd != 0) {
937 breakwaitcmd = 0;
938 if (pid <= 0)
939 return -1;
940 }
941 if (pid <= 0)
942 return pid;
943 INTOFF;
944 thisjob = NULL;
945 for (jp = jobtab ; jp < jobtab + njobs ; jp++) {
946 if (jp->used) {
947 done = 1;
948 stopped = 1;
949 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) {
950 if (sp->pid == -1)
951 continue;
952 if (sp->pid == pid) {
953 TRACE(("Changing status of proc %d from 0x%x to 0x%x\n",
954 (int)pid, sp->status,
955 status));
956 sp->status = status;
957 thisjob = jp;
958 }
959 if (sp->status == -1)
960 stopped = 0;
961 else if (WIFSTOPPED(sp->status))
962 done = 0;
963 }
964 if (stopped) { /* stopped or done */
965 int state = done? JOBDONE : JOBSTOPPED;
966 if (jp->state != state) {
967 TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state));
968 jp->state = state;
969#if JOBS
970 if (done)
971 deljob(jp);
972#endif
973 }
974 }
975 }
976 }
977 INTON;
978 if (! rootshell || ! iflag || (job && thisjob == job)) {
979#if JOBS
980 if (WIFSTOPPED(status))
981 sig = WSTOPSIG(status);
982 else
983#endif
984 {
985 if (WIFEXITED(status))
986 sig = 0;
987 else
988 sig = WTERMSIG(status);
989 }
990 if (sig != 0 && sig != SIGINT && sig != SIGPIPE) {
991 if (!mflag ||
992 (thisjob->foreground && !WIFSTOPPED(status))) {
993 i = WTERMSIG(status);
994 if ((i & 0x7F) < sys_nsig && sys_siglist[i & 0x7F])
995 out1str(sys_siglist[i & 0x7F]);
996 else
997 out1fmt("Signal %d", i & 0x7F);
998 if (WCOREDUMP(status))
999 out1str(" (core dumped)");
1000 out1c('\n');
1001 } else
1002 showjob(thisjob, pid, SHOWJOBS_DEFAULT);
1003 }
1004 } else {
1005 TRACE(("Not printing status, rootshell=%d, job=%p\n", rootshell, job));
1006 if (thisjob)
1007 thisjob->changed = 1;
1008 }
1009 return pid;
1010}
1011
1012
1013
1014/*
1015 * Do a wait system call. If job control is compiled in, we accept
1016 * stopped processes. If block is zero, we return a value of zero
1017 * rather than blocking.
1018 */
1019STATIC pid_t
1020waitproc(int block, int *status)
1021{
1022 int flags;
1023
1024#if JOBS
1025 flags = WUNTRACED;
1026#else
1027 flags = 0;
1028#endif
1029 if (block == 0)
1030 flags |= WNOHANG;
1031 return wait3(status, flags, (struct rusage *)NULL);
1032}
1033
1034/*
1035 * return 1 if there are stopped jobs, otherwise 0
1036 */
1037int job_warning = 0;
1038int
1039stoppedjobs(void)
1040{
1041 int jobno;
1042 struct job *jp;
1043
1044 if (job_warning)
1045 return (0);
1046 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) {
1047 if (jp->used == 0)
1048 continue;
1049 if (jp->state == JOBSTOPPED) {
1050 out2fmt_flush("You have stopped jobs.\n");
1051 job_warning = 2;
1052 return (1);
1053 }
1054 }
1055
1056 return (0);
1057}
1058
1059/*
1060 * Return a string identifying a command (to be printed by the
1061 * jobs command.
1062 */
1063
1064STATIC char *cmdnextc;
1065STATIC int cmdnleft;
1066#define MAXCMDTEXT 200
1067
1068char *
1069commandtext(union node *n)
1070{
1071 char *name;
1072
1073 cmdnextc = name = ckmalloc(MAXCMDTEXT);
1074 cmdnleft = MAXCMDTEXT - 4;
1075 cmdtxt(n);
1076 *cmdnextc = '\0';
1077 return name;
1078}
1079
1080
1081STATIC void
1082cmdtxt(union node *n)
1083{
1084 union node *np;
1085 struct nodelist *lp;
96#if JOBS
97STATIC void setcurjob(struct job *);
98STATIC void deljob(struct job *);
99STATIC struct job *getcurjob(struct job *);
100#endif
101STATIC void showjob(struct job *, pid_t, int);
102
103
104/*
105 * Turn job control on and off.
106 */
107
108MKINIT int jobctl;
109
110#if JOBS
111void
112setjobctl(int on)
113{
114 int i;
115
116 if (on == jobctl || rootshell == 0)
117 return;
118 if (on) {
119 if (ttyfd != -1)
120 close(ttyfd);
121 if ((ttyfd = open(_PATH_TTY, O_RDWR)) < 0) {
122 i = 0;
123 while (i <= 2 && !isatty(i))
124 i++;
125 if (i > 2 || (ttyfd = fcntl(i, F_DUPFD, 10)) < 0)
126 goto out;
127 }
128 if (ttyfd < 10) {
129 /*
130 * Keep our TTY file descriptor out of the way of
131 * the user's redirections.
132 */
133 if ((i = fcntl(ttyfd, F_DUPFD, 10)) < 0) {
134 close(ttyfd);
135 ttyfd = -1;
136 goto out;
137 }
138 close(ttyfd);
139 ttyfd = i;
140 }
141 if (fcntl(ttyfd, F_SETFD, FD_CLOEXEC) < 0) {
142 close(ttyfd);
143 ttyfd = -1;
144 goto out;
145 }
146 do { /* while we are in the background */
147 initialpgrp = tcgetpgrp(ttyfd);
148 if (initialpgrp < 0) {
149out: out2fmt_flush("sh: can't access tty; job control turned off\n");
150 mflag = 0;
151 return;
152 }
153 if (initialpgrp == -1)
154 initialpgrp = getpgrp();
155 else if (initialpgrp != getpgrp()) {
156 killpg(0, SIGTTIN);
157 continue;
158 }
159 } while (0);
160 setsignal(SIGTSTP);
161 setsignal(SIGTTOU);
162 setsignal(SIGTTIN);
163 setpgid(0, rootpid);
164 tcsetpgrp(ttyfd, rootpid);
165 } else { /* turning job control off */
166 setpgid(0, initialpgrp);
167 tcsetpgrp(ttyfd, initialpgrp);
168 close(ttyfd);
169 ttyfd = -1;
170 setsignal(SIGTSTP);
171 setsignal(SIGTTOU);
172 setsignal(SIGTTIN);
173 }
174 jobctl = on;
175}
176#endif
177
178
179#ifdef mkinit
180INCLUDE <sys/types.h>
181INCLUDE <stdlib.h>
182
183SHELLPROC {
184 backgndpid = -1;
185#if JOBS
186 jobctl = 0;
187#endif
188}
189
190#endif
191
192
193
194#if JOBS
195int
196fgcmd(int argc __unused, char **argv)
197{
198 struct job *jp;
199 pid_t pgrp;
200 int status;
201
202 jp = getjob(argv[1]);
203 if (jp->jobctl == 0)
204 error("job not created under job control");
205 out1str(jp->ps[0].cmd);
206 out1c('\n');
207 flushout(&output);
208 pgrp = jp->ps[0].pid;
209 tcsetpgrp(ttyfd, pgrp);
210 restartjob(jp);
211 jp->foreground = 1;
212 INTOFF;
213 status = waitforjob(jp, (int *)NULL);
214 INTON;
215 return status;
216}
217
218
219int
220bgcmd(int argc, char **argv)
221{
222 char s[64];
223 struct job *jp;
224
225 do {
226 jp = getjob(*++argv);
227 if (jp->jobctl == 0)
228 error("job not created under job control");
229 if (jp->state == JOBDONE)
230 continue;
231 restartjob(jp);
232 jp->foreground = 0;
233 fmtstr(s, 64, "[%td] ", jp - jobtab + 1);
234 out1str(s);
235 out1str(jp->ps[0].cmd);
236 out1c('\n');
237 } while (--argc > 1);
238 return 0;
239}
240
241
242STATIC void
243restartjob(struct job *jp)
244{
245 struct procstat *ps;
246 int i;
247
248 if (jp->state == JOBDONE)
249 return;
250 setcurjob(jp);
251 INTOFF;
252 killpg(jp->ps[0].pid, SIGCONT);
253 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
254 if (WIFSTOPPED(ps->status)) {
255 ps->status = -1;
256 jp->state = 0;
257 }
258 }
259 INTON;
260}
261#endif
262
263
264int
265jobscmd(int argc, char *argv[])
266{
267 char *id;
268 int ch, mode;
269
270 optind = optreset = 1;
271 opterr = 0;
272 mode = SHOWJOBS_DEFAULT;
273 while ((ch = getopt(argc, argv, "lps")) != -1) {
274 switch (ch) {
275 case 'l':
276 mode = SHOWJOBS_VERBOSE;
277 break;
278 case 'p':
279 mode = SHOWJOBS_PGIDS;
280 break;
281 case 's':
282 mode = SHOWJOBS_PIDS;
283 break;
284 case '?':
285 default:
286 error("unknown option: -%c", optopt);
287 }
288 }
289 argc -= optind;
290 argv += optind;
291
292 if (argc == 0)
293 showjobs(0, mode);
294 else
295 while ((id = *argv++) != NULL)
296 showjob(getjob(id), 0, mode);
297
298 return (0);
299}
300
301STATIC void
302showjob(struct job *jp, pid_t pid, int mode)
303{
304 char s[64];
305 struct procstat *ps;
306 struct job *j;
307 int col, curr, i, jobno, prev, procno;
308 pid_t ppid;
309 char c;
310
311 procno = (mode == SHOWJOBS_PGIDS) ? 1 : jp->nprocs;
312 jobno = jp - jobtab + 1;
313 curr = prev = 0;
314#if JOBS
315 if ((j = getcurjob(NULL)) != NULL) {
316 curr = j - jobtab + 1;
317 if ((j = getcurjob(j)) != NULL)
318 prev = j - jobtab + 1;
319 }
320#endif
321 for (ps = jp->ps ; ; ps++) { /* for each process */
322 if (mode == SHOWJOBS_PIDS || mode == SHOWJOBS_PGIDS) {
323 ppid = (mode == SHOWJOBS_PIDS) ? ps->pid :
324 getpgid(ps->pid);
325 out1fmt("%d\n", (int)ppid);
326 goto skip;
327 }
328 if (mode != SHOWJOBS_VERBOSE && ps != jp->ps && pid == 0)
329 goto skip;
330 if (pid != 0 && pid != ps->pid)
331 goto skip;
332 if (jobno == curr && ps == jp->ps)
333 c = '+';
334 else if (jobno == prev && ps == jp->ps)
335 c = '-';
336 else
337 c = ' ';
338 if (ps == jp->ps)
339 fmtstr(s, 64, "[%d] %c ", jobno, c);
340 else
341 fmtstr(s, 64, " %c ", c);
342 out1str(s);
343 col = strlen(s);
344 if (mode == SHOWJOBS_VERBOSE) {
345 fmtstr(s, 64, "%d ", (int)ps->pid);
346 out1str(s);
347 col += strlen(s);
348 }
349 s[0] = '\0';
350 if (ps != jp->ps) {
351 *s = '\0';
352 } else if (ps->status == -1) {
353 strcpy(s, "Running");
354 } else if (WIFEXITED(ps->status)) {
355 if (WEXITSTATUS(ps->status) == 0)
356 strcpy(s, "Done");
357 else
358 fmtstr(s, 64, "Done (%d)",
359 WEXITSTATUS(ps->status));
360 } else {
361#if JOBS
362 if (WIFSTOPPED(ps->status))
363 i = WSTOPSIG(ps->status);
364 else
365#endif
366 i = WTERMSIG(ps->status);
367 if ((i & 0x7F) < sys_nsig && sys_siglist[i & 0x7F])
368 scopy(sys_siglist[i & 0x7F], s);
369 else
370 fmtstr(s, 64, "Signal %d", i & 0x7F);
371 if (WCOREDUMP(ps->status))
372 strcat(s, " (core dumped)");
373 }
374 out1str(s);
375 col += strlen(s);
376 do {
377 out1c(' ');
378 col++;
379 } while (col < 30);
380 out1str(ps->cmd);
381 out1c('\n');
382skip: if (--procno <= 0)
383 break;
384 }
385}
386
387/*
388 * Print a list of jobs. If "change" is nonzero, only print jobs whose
389 * statuses have changed since the last call to showjobs.
390 *
391 * If the shell is interrupted in the process of creating a job, the
392 * result may be a job structure containing zero processes. Such structures
393 * will be freed here.
394 */
395
396void
397showjobs(int change, int mode)
398{
399 int jobno;
400 struct job *jp;
401
402 TRACE(("showjobs(%d) called\n", change));
403 while (dowait(0, (struct job *)NULL) > 0);
404 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) {
405 if (! jp->used)
406 continue;
407 if (jp->nprocs == 0) {
408 freejob(jp);
409 continue;
410 }
411 if (change && ! jp->changed)
412 continue;
413 showjob(jp, 0, mode);
414 jp->changed = 0;
415 if (jp->state == JOBDONE) {
416 freejob(jp);
417 }
418 }
419}
420
421
422/*
423 * Mark a job structure as unused.
424 */
425
426STATIC void
427freejob(struct job *jp)
428{
429 struct procstat *ps;
430 int i;
431
432 INTOFF;
433 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
434 if (ps->cmd != nullstr)
435 ckfree(ps->cmd);
436 }
437 if (jp->ps != &jp->ps0)
438 ckfree(jp->ps);
439 jp->used = 0;
440#if JOBS
441 deljob(jp);
442#endif
443 INTON;
444}
445
446
447
448int
449waitcmd(int argc, char **argv)
450{
451 struct job *job;
452 int status, retval;
453 struct job *jp;
454
455 if (argc > 1) {
456 job = getjob(argv[1]);
457 } else {
458 job = NULL;
459 }
460
461 /*
462 * Loop until a process is terminated or stopped, or a SIGINT is
463 * received.
464 */
465
466 in_waitcmd++;
467 do {
468 if (job != NULL) {
469 if (job->state) {
470 status = job->ps[job->nprocs - 1].status;
471 if (WIFEXITED(status))
472 retval = WEXITSTATUS(status);
473#if JOBS
474 else if (WIFSTOPPED(status))
475 retval = WSTOPSIG(status) + 128;
476#endif
477 else
478 retval = WTERMSIG(status) + 128;
479 if (! iflag)
480 freejob(job);
481 in_waitcmd--;
482 return retval;
483 }
484 } else {
485 for (jp = jobtab ; ; jp++) {
486 if (jp >= jobtab + njobs) { /* no running procs */
487 in_waitcmd--;
488 return 0;
489 }
490 if (jp->used && jp->state == 0)
491 break;
492 }
493 }
494 } while (dowait(1, (struct job *)NULL) != -1);
495 in_waitcmd--;
496
497 return 0;
498}
499
500
501
502int
503jobidcmd(int argc __unused, char **argv)
504{
505 struct job *jp;
506 int i;
507
508 jp = getjob(argv[1]);
509 for (i = 0 ; i < jp->nprocs ; ) {
510 out1fmt("%d", (int)jp->ps[i].pid);
511 out1c(++i < jp->nprocs? ' ' : '\n');
512 }
513 return 0;
514}
515
516
517
518/*
519 * Convert a job name to a job structure.
520 */
521
522STATIC struct job *
523getjob(char *name)
524{
525 int jobno;
526 struct job *found, *jp;
527 pid_t pid;
528 int i;
529
530 if (name == NULL) {
531#if JOBS
532currentjob: if ((jp = getcurjob(NULL)) == NULL)
533 error("No current job");
534 return (jp);
535#else
536 error("No current job");
537#endif
538 } else if (name[0] == '%') {
539 if (is_digit(name[1])) {
540 jobno = number(name + 1);
541 if (jobno > 0 && jobno <= njobs
542 && jobtab[jobno - 1].used != 0)
543 return &jobtab[jobno - 1];
544#if JOBS
545 } else if (name[1] == '%' && name[2] == '\0') {
546 goto currentjob;
547 } else if (name[1] == '+' && name[2] == '\0') {
548 goto currentjob;
549 } else if (name[1] == '-' && name[2] == '\0') {
550 if ((jp = getcurjob(NULL)) == NULL ||
551 (jp = getcurjob(jp)) == NULL)
552 error("No previous job");
553 return (jp);
554#endif
555 } else if (name[1] == '?') {
556 found = NULL;
557 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
558 if (jp->used && jp->nprocs > 0
559 && strstr(jp->ps[0].cmd, name + 2) != NULL) {
560 if (found)
561 error("%s: ambiguous", name);
562 found = jp;
563 }
564 }
565 if (found != NULL)
566 return (found);
567 } else {
568 found = NULL;
569 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
570 if (jp->used && jp->nprocs > 0
571 && prefix(name + 1, jp->ps[0].cmd)) {
572 if (found)
573 error("%s: ambiguous", name);
574 found = jp;
575 }
576 }
577 if (found)
578 return found;
579 }
580 } else if (is_number(name)) {
581 pid = (pid_t)number(name);
582 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
583 if (jp->used && jp->nprocs > 0
584 && jp->ps[jp->nprocs - 1].pid == pid)
585 return jp;
586 }
587 }
588 error("No such job: %s", name);
589 /*NOTREACHED*/
590 return NULL;
591}
592
593
594
595/*
596 * Return a new job structure,
597 */
598
599struct job *
600makejob(union node *node __unused, int nprocs)
601{
602 int i;
603 struct job *jp;
604
605 for (i = njobs, jp = jobtab ; ; jp++) {
606 if (--i < 0) {
607 INTOFF;
608 if (njobs == 0) {
609 jobtab = ckmalloc(4 * sizeof jobtab[0]);
610#if JOBS
611 jobmru = NULL;
612#endif
613 } else {
614 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]);
615 memcpy(jp, jobtab, njobs * sizeof jp[0]);
616#if JOBS
617 /* Relocate `next' pointers and list head */
618 if (jobmru != NULL)
619 jobmru = &jp[jobmru - jobtab];
620 for (i = 0; i < njobs; i++)
621 if (jp[i].next != NULL)
622 jp[i].next = &jp[jp[i].next -
623 jobtab];
624#endif
625 /* Relocate `ps' pointers */
626 for (i = 0; i < njobs; i++)
627 if (jp[i].ps == &jobtab[i].ps0)
628 jp[i].ps = &jp[i].ps0;
629 ckfree(jobtab);
630 jobtab = jp;
631 }
632 jp = jobtab + njobs;
633 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0);
634 INTON;
635 break;
636 }
637 if (jp->used == 0)
638 break;
639 }
640 INTOFF;
641 jp->state = 0;
642 jp->used = 1;
643 jp->changed = 0;
644 jp->nprocs = 0;
645 jp->foreground = 0;
646#if JOBS
647 jp->jobctl = jobctl;
648 jp->next = NULL;
649#endif
650 if (nprocs > 1) {
651 jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
652 } else {
653 jp->ps = &jp->ps0;
654 }
655 INTON;
656 TRACE(("makejob(%p, %d) returns %%%d\n", (void *)node, nprocs,
657 jp - jobtab + 1));
658 return jp;
659}
660
661#if JOBS
662STATIC void
663setcurjob(struct job *cj)
664{
665 struct job *jp, *prev;
666
667 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) {
668 if (jp == cj) {
669 if (prev != NULL)
670 prev->next = jp->next;
671 else
672 jobmru = jp->next;
673 jp->next = jobmru;
674 jobmru = cj;
675 return;
676 }
677 }
678 cj->next = jobmru;
679 jobmru = cj;
680}
681
682STATIC void
683deljob(struct job *j)
684{
685 struct job *jp, *prev;
686
687 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) {
688 if (jp == j) {
689 if (prev != NULL)
690 prev->next = jp->next;
691 else
692 jobmru = jp->next;
693 return;
694 }
695 }
696}
697
698/*
699 * Return the most recently used job that isn't `nj', and preferably one
700 * that is stopped.
701 */
702STATIC struct job *
703getcurjob(struct job *nj)
704{
705 struct job *jp;
706
707 /* Try to find a stopped one.. */
708 for (jp = jobmru; jp != NULL; jp = jp->next)
709 if (jp->used && jp != nj && jp->state == JOBSTOPPED)
710 return (jp);
711 /* Otherwise the most recently used job that isn't `nj' */
712 for (jp = jobmru; jp != NULL; jp = jp->next)
713 if (jp->used && jp != nj)
714 return (jp);
715
716 return (NULL);
717}
718
719#endif
720
721/*
722 * Fork of a subshell. If we are doing job control, give the subshell its
723 * own process group. Jp is a job structure that the job is to be added to.
724 * N is the command that will be evaluated by the child. Both jp and n may
725 * be NULL. The mode parameter can be one of the following:
726 * FORK_FG - Fork off a foreground process.
727 * FORK_BG - Fork off a background process.
728 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
729 * process group even if job control is on.
730 *
731 * When job control is turned off, background processes have their standard
732 * input redirected to /dev/null (except for the second and later processes
733 * in a pipeline).
734 */
735
736pid_t
737forkshell(struct job *jp, union node *n, int mode)
738{
739 pid_t pid;
740 pid_t pgrp;
741
742 TRACE(("forkshell(%%%d, %p, %d) called\n", jp - jobtab, (void *)n,
743 mode));
744 INTOFF;
745 flushall();
746 pid = fork();
747 if (pid == -1) {
748 TRACE(("Fork failed, errno=%d\n", errno));
749 INTON;
750 error("Cannot fork: %s", strerror(errno));
751 }
752 if (pid == 0) {
753 struct job *p;
754 int wasroot;
755 int i;
756
757 TRACE(("Child shell %d\n", (int)getpid()));
758 wasroot = rootshell;
759 rootshell = 0;
760 handler = &main_handler;
761 closescript();
762 INTON;
763 clear_traps();
764#if JOBS
765 jobctl = 0; /* do job control only in root shell */
766 if (wasroot && mode != FORK_NOJOB && mflag) {
767 if (jp == NULL || jp->nprocs == 0)
768 pgrp = getpid();
769 else
770 pgrp = jp->ps[0].pid;
771 if (setpgid(0, pgrp) == 0 && mode == FORK_FG) {
772 /*** this causes superfluous TIOCSPGRPS ***/
773 if (tcsetpgrp(ttyfd, pgrp) < 0)
774 error("tcsetpgrp failed, errno=%d", errno);
775 }
776 setsignal(SIGTSTP);
777 setsignal(SIGTTOU);
778 } else if (mode == FORK_BG) {
779 ignoresig(SIGINT);
780 ignoresig(SIGQUIT);
781 if ((jp == NULL || jp->nprocs == 0) &&
782 ! fd0_redirected_p ()) {
783 close(0);
784 if (open(_PATH_DEVNULL, O_RDONLY) != 0)
785 error("Can't open %s: %s",
786 _PATH_DEVNULL, strerror(errno));
787 }
788 }
789#else
790 if (mode == FORK_BG) {
791 ignoresig(SIGINT);
792 ignoresig(SIGQUIT);
793 if ((jp == NULL || jp->nprocs == 0) &&
794 ! fd0_redirected_p ()) {
795 close(0);
796 if (open(_PATH_DEVNULL, O_RDONLY) != 0)
797 error("Can't open %s: %s",
798 _PATH_DEVNULL, strerror(errno));
799 }
800 }
801#endif
802 INTOFF;
803 for (i = njobs, p = jobtab ; --i >= 0 ; p++)
804 if (p->used)
805 freejob(p);
806 INTON;
807 if (wasroot && iflag) {
808 setsignal(SIGINT);
809 setsignal(SIGQUIT);
810 setsignal(SIGTERM);
811 }
812 return pid;
813 }
814 if (rootshell && mode != FORK_NOJOB && mflag) {
815 if (jp == NULL || jp->nprocs == 0)
816 pgrp = pid;
817 else
818 pgrp = jp->ps[0].pid;
819 setpgid(pid, pgrp);
820 }
821 if (mode == FORK_BG)
822 backgndpid = pid; /* set $! */
823 if (jp) {
824 struct procstat *ps = &jp->ps[jp->nprocs++];
825 ps->pid = pid;
826 ps->status = -1;
827 ps->cmd = nullstr;
828 if (iflag && rootshell && n)
829 ps->cmd = commandtext(n);
830 jp->foreground = mode == FORK_FG;
831#if JOBS
832 setcurjob(jp);
833#endif
834 }
835 INTON;
836 TRACE(("In parent shell: child = %d\n", (int)pid));
837 return pid;
838}
839
840
841
842/*
843 * Wait for job to finish.
844 *
845 * Under job control we have the problem that while a child process is
846 * running interrupts generated by the user are sent to the child but not
847 * to the shell. This means that an infinite loop started by an inter-
848 * active user may be hard to kill. With job control turned off, an
849 * interactive user may place an interactive program inside a loop. If
850 * the interactive program catches interrupts, the user doesn't want
851 * these interrupts to also abort the loop. The approach we take here
852 * is to have the shell ignore interrupt signals while waiting for a
853 * foreground process to terminate, and then send itself an interrupt
854 * signal if the child process was terminated by an interrupt signal.
855 * Unfortunately, some programs want to do a bit of cleanup and then
856 * exit on interrupt; unless these processes terminate themselves by
857 * sending a signal to themselves (instead of calling exit) they will
858 * confuse this approach.
859 */
860
861int
862waitforjob(struct job *jp, int *origstatus)
863{
864#if JOBS
865 pid_t mypgrp = getpgrp();
866#endif
867 int status;
868 int st;
869
870 INTOFF;
871 TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1));
872 while (jp->state == 0)
873 if (dowait(1, jp) == -1)
874 dotrap();
875#if JOBS
876 if (jp->jobctl) {
877 if (tcsetpgrp(ttyfd, mypgrp) < 0)
878 error("tcsetpgrp failed, errno=%d\n", errno);
879 }
880 if (jp->state == JOBSTOPPED)
881 setcurjob(jp);
882#endif
883 status = jp->ps[jp->nprocs - 1].status;
884 if (origstatus != NULL)
885 *origstatus = status;
886 /* convert to 8 bits */
887 if (WIFEXITED(status))
888 st = WEXITSTATUS(status);
889#if JOBS
890 else if (WIFSTOPPED(status))
891 st = WSTOPSIG(status) + 128;
892#endif
893 else
894 st = WTERMSIG(status) + 128;
895 if (! JOBS || jp->state == JOBDONE)
896 freejob(jp);
897 if (int_pending()) {
898 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
899 kill(getpid(), SIGINT);
900 else
901 CLEAR_PENDING_INT;
902 }
903 INTON;
904 return st;
905}
906
907
908
909/*
910 * Wait for a process to terminate.
911 */
912
913STATIC pid_t
914dowait(int block, struct job *job)
915{
916 pid_t pid;
917 int status;
918 struct procstat *sp;
919 struct job *jp;
920 struct job *thisjob;
921 int done;
922 int stopped;
923 int sig;
924 int i;
925
926 in_dowait++;
927 TRACE(("dowait(%d) called\n", block));
928 do {
929 pid = waitproc(block, &status);
930 TRACE(("wait returns %d, status=%d\n", (int)pid, status));
931 } while ((pid == -1 && errno == EINTR && breakwaitcmd == 0) ||
932 (pid > 0 && WIFSTOPPED(status) && !iflag));
933 in_dowait--;
934 if (pid == -1 && errno == ECHILD && job != NULL)
935 job->state = JOBDONE;
936 if (breakwaitcmd != 0) {
937 breakwaitcmd = 0;
938 if (pid <= 0)
939 return -1;
940 }
941 if (pid <= 0)
942 return pid;
943 INTOFF;
944 thisjob = NULL;
945 for (jp = jobtab ; jp < jobtab + njobs ; jp++) {
946 if (jp->used) {
947 done = 1;
948 stopped = 1;
949 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) {
950 if (sp->pid == -1)
951 continue;
952 if (sp->pid == pid) {
953 TRACE(("Changing status of proc %d from 0x%x to 0x%x\n",
954 (int)pid, sp->status,
955 status));
956 sp->status = status;
957 thisjob = jp;
958 }
959 if (sp->status == -1)
960 stopped = 0;
961 else if (WIFSTOPPED(sp->status))
962 done = 0;
963 }
964 if (stopped) { /* stopped or done */
965 int state = done? JOBDONE : JOBSTOPPED;
966 if (jp->state != state) {
967 TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state));
968 jp->state = state;
969#if JOBS
970 if (done)
971 deljob(jp);
972#endif
973 }
974 }
975 }
976 }
977 INTON;
978 if (! rootshell || ! iflag || (job && thisjob == job)) {
979#if JOBS
980 if (WIFSTOPPED(status))
981 sig = WSTOPSIG(status);
982 else
983#endif
984 {
985 if (WIFEXITED(status))
986 sig = 0;
987 else
988 sig = WTERMSIG(status);
989 }
990 if (sig != 0 && sig != SIGINT && sig != SIGPIPE) {
991 if (!mflag ||
992 (thisjob->foreground && !WIFSTOPPED(status))) {
993 i = WTERMSIG(status);
994 if ((i & 0x7F) < sys_nsig && sys_siglist[i & 0x7F])
995 out1str(sys_siglist[i & 0x7F]);
996 else
997 out1fmt("Signal %d", i & 0x7F);
998 if (WCOREDUMP(status))
999 out1str(" (core dumped)");
1000 out1c('\n');
1001 } else
1002 showjob(thisjob, pid, SHOWJOBS_DEFAULT);
1003 }
1004 } else {
1005 TRACE(("Not printing status, rootshell=%d, job=%p\n", rootshell, job));
1006 if (thisjob)
1007 thisjob->changed = 1;
1008 }
1009 return pid;
1010}
1011
1012
1013
1014/*
1015 * Do a wait system call. If job control is compiled in, we accept
1016 * stopped processes. If block is zero, we return a value of zero
1017 * rather than blocking.
1018 */
1019STATIC pid_t
1020waitproc(int block, int *status)
1021{
1022 int flags;
1023
1024#if JOBS
1025 flags = WUNTRACED;
1026#else
1027 flags = 0;
1028#endif
1029 if (block == 0)
1030 flags |= WNOHANG;
1031 return wait3(status, flags, (struct rusage *)NULL);
1032}
1033
1034/*
1035 * return 1 if there are stopped jobs, otherwise 0
1036 */
1037int job_warning = 0;
1038int
1039stoppedjobs(void)
1040{
1041 int jobno;
1042 struct job *jp;
1043
1044 if (job_warning)
1045 return (0);
1046 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) {
1047 if (jp->used == 0)
1048 continue;
1049 if (jp->state == JOBSTOPPED) {
1050 out2fmt_flush("You have stopped jobs.\n");
1051 job_warning = 2;
1052 return (1);
1053 }
1054 }
1055
1056 return (0);
1057}
1058
1059/*
1060 * Return a string identifying a command (to be printed by the
1061 * jobs command.
1062 */
1063
1064STATIC char *cmdnextc;
1065STATIC int cmdnleft;
1066#define MAXCMDTEXT 200
1067
1068char *
1069commandtext(union node *n)
1070{
1071 char *name;
1072
1073 cmdnextc = name = ckmalloc(MAXCMDTEXT);
1074 cmdnleft = MAXCMDTEXT - 4;
1075 cmdtxt(n);
1076 *cmdnextc = '\0';
1077 return name;
1078}
1079
1080
1081STATIC void
1082cmdtxt(union node *n)
1083{
1084 union node *np;
1085 struct nodelist *lp;
1086 char *p;
1086 const char *p;
1087 int i;
1088 char s[2];
1089
1090 if (n == NULL)
1091 return;
1092 switch (n->type) {
1093 case NSEMI:
1094 cmdtxt(n->nbinary.ch1);
1095 cmdputs("; ");
1096 cmdtxt(n->nbinary.ch2);
1097 break;
1098 case NAND:
1099 cmdtxt(n->nbinary.ch1);
1100 cmdputs(" && ");
1101 cmdtxt(n->nbinary.ch2);
1102 break;
1103 case NOR:
1104 cmdtxt(n->nbinary.ch1);
1105 cmdputs(" || ");
1106 cmdtxt(n->nbinary.ch2);
1107 break;
1108 case NPIPE:
1109 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
1110 cmdtxt(lp->n);
1111 if (lp->next)
1112 cmdputs(" | ");
1113 }
1114 break;
1115 case NSUBSHELL:
1116 cmdputs("(");
1117 cmdtxt(n->nredir.n);
1118 cmdputs(")");
1119 break;
1120 case NREDIR:
1121 case NBACKGND:
1122 cmdtxt(n->nredir.n);
1123 break;
1124 case NIF:
1125 cmdputs("if ");
1126 cmdtxt(n->nif.test);
1127 cmdputs("; then ");
1128 cmdtxt(n->nif.ifpart);
1129 cmdputs("...");
1130 break;
1131 case NWHILE:
1132 cmdputs("while ");
1133 goto until;
1134 case NUNTIL:
1135 cmdputs("until ");
1136until:
1137 cmdtxt(n->nbinary.ch1);
1138 cmdputs("; do ");
1139 cmdtxt(n->nbinary.ch2);
1140 cmdputs("; done");
1141 break;
1142 case NFOR:
1143 cmdputs("for ");
1144 cmdputs(n->nfor.var);
1145 cmdputs(" in ...");
1146 break;
1147 case NCASE:
1148 cmdputs("case ");
1149 cmdputs(n->ncase.expr->narg.text);
1150 cmdputs(" in ...");
1151 break;
1152 case NDEFUN:
1153 cmdputs(n->narg.text);
1154 cmdputs("() ...");
1155 break;
1156 case NCMD:
1157 for (np = n->ncmd.args ; np ; np = np->narg.next) {
1158 cmdtxt(np);
1159 if (np->narg.next)
1160 cmdputs(" ");
1161 }
1162 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
1163 cmdputs(" ");
1164 cmdtxt(np);
1165 }
1166 break;
1167 case NARG:
1168 cmdputs(n->narg.text);
1169 break;
1170 case NTO:
1171 p = ">"; i = 1; goto redir;
1172 case NAPPEND:
1173 p = ">>"; i = 1; goto redir;
1174 case NTOFD:
1175 p = ">&"; i = 1; goto redir;
1176 case NCLOBBER:
1177 p = ">|"; i = 1; goto redir;
1178 case NFROM:
1179 p = "<"; i = 0; goto redir;
1180 case NFROMTO:
1181 p = "<>"; i = 0; goto redir;
1182 case NFROMFD:
1183 p = "<&"; i = 0; goto redir;
1184redir:
1185 if (n->nfile.fd != i) {
1186 s[0] = n->nfile.fd + '0';
1187 s[1] = '\0';
1188 cmdputs(s);
1189 }
1190 cmdputs(p);
1191 if (n->type == NTOFD || n->type == NFROMFD) {
1192 if (n->ndup.dupfd >= 0)
1193 s[0] = n->ndup.dupfd + '0';
1194 else
1195 s[0] = '-';
1196 s[1] = '\0';
1197 cmdputs(s);
1198 } else {
1199 cmdtxt(n->nfile.fname);
1200 }
1201 break;
1202 case NHERE:
1203 case NXHERE:
1204 cmdputs("<<...");
1205 break;
1206 default:
1207 cmdputs("???");
1208 break;
1209 }
1210}
1211
1212
1213
1214STATIC void
1087 int i;
1088 char s[2];
1089
1090 if (n == NULL)
1091 return;
1092 switch (n->type) {
1093 case NSEMI:
1094 cmdtxt(n->nbinary.ch1);
1095 cmdputs("; ");
1096 cmdtxt(n->nbinary.ch2);
1097 break;
1098 case NAND:
1099 cmdtxt(n->nbinary.ch1);
1100 cmdputs(" && ");
1101 cmdtxt(n->nbinary.ch2);
1102 break;
1103 case NOR:
1104 cmdtxt(n->nbinary.ch1);
1105 cmdputs(" || ");
1106 cmdtxt(n->nbinary.ch2);
1107 break;
1108 case NPIPE:
1109 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
1110 cmdtxt(lp->n);
1111 if (lp->next)
1112 cmdputs(" | ");
1113 }
1114 break;
1115 case NSUBSHELL:
1116 cmdputs("(");
1117 cmdtxt(n->nredir.n);
1118 cmdputs(")");
1119 break;
1120 case NREDIR:
1121 case NBACKGND:
1122 cmdtxt(n->nredir.n);
1123 break;
1124 case NIF:
1125 cmdputs("if ");
1126 cmdtxt(n->nif.test);
1127 cmdputs("; then ");
1128 cmdtxt(n->nif.ifpart);
1129 cmdputs("...");
1130 break;
1131 case NWHILE:
1132 cmdputs("while ");
1133 goto until;
1134 case NUNTIL:
1135 cmdputs("until ");
1136until:
1137 cmdtxt(n->nbinary.ch1);
1138 cmdputs("; do ");
1139 cmdtxt(n->nbinary.ch2);
1140 cmdputs("; done");
1141 break;
1142 case NFOR:
1143 cmdputs("for ");
1144 cmdputs(n->nfor.var);
1145 cmdputs(" in ...");
1146 break;
1147 case NCASE:
1148 cmdputs("case ");
1149 cmdputs(n->ncase.expr->narg.text);
1150 cmdputs(" in ...");
1151 break;
1152 case NDEFUN:
1153 cmdputs(n->narg.text);
1154 cmdputs("() ...");
1155 break;
1156 case NCMD:
1157 for (np = n->ncmd.args ; np ; np = np->narg.next) {
1158 cmdtxt(np);
1159 if (np->narg.next)
1160 cmdputs(" ");
1161 }
1162 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
1163 cmdputs(" ");
1164 cmdtxt(np);
1165 }
1166 break;
1167 case NARG:
1168 cmdputs(n->narg.text);
1169 break;
1170 case NTO:
1171 p = ">"; i = 1; goto redir;
1172 case NAPPEND:
1173 p = ">>"; i = 1; goto redir;
1174 case NTOFD:
1175 p = ">&"; i = 1; goto redir;
1176 case NCLOBBER:
1177 p = ">|"; i = 1; goto redir;
1178 case NFROM:
1179 p = "<"; i = 0; goto redir;
1180 case NFROMTO:
1181 p = "<>"; i = 0; goto redir;
1182 case NFROMFD:
1183 p = "<&"; i = 0; goto redir;
1184redir:
1185 if (n->nfile.fd != i) {
1186 s[0] = n->nfile.fd + '0';
1187 s[1] = '\0';
1188 cmdputs(s);
1189 }
1190 cmdputs(p);
1191 if (n->type == NTOFD || n->type == NFROMFD) {
1192 if (n->ndup.dupfd >= 0)
1193 s[0] = n->ndup.dupfd + '0';
1194 else
1195 s[0] = '-';
1196 s[1] = '\0';
1197 cmdputs(s);
1198 } else {
1199 cmdtxt(n->nfile.fname);
1200 }
1201 break;
1202 case NHERE:
1203 case NXHERE:
1204 cmdputs("<<...");
1205 break;
1206 default:
1207 cmdputs("???");
1208 break;
1209 }
1210}
1211
1212
1213
1214STATIC void
1215cmdputs(char *s)
1215cmdputs(const char *s)
1216{
1216{
1217 char *p, *q;
1217 const char *p;
1218 char *q;
1218 char c;
1219 int subtype = 0;
1220
1221 if (cmdnleft <= 0)
1222 return;
1223 p = s;
1224 q = cmdnextc;
1225 while ((c = *p++) != '\0') {
1226 if (c == CTLESC)
1227 *q++ = *p++;
1228 else if (c == CTLVAR) {
1229 *q++ = '$';
1230 if (--cmdnleft > 0)
1231 *q++ = '{';
1232 subtype = *p++;
1233 } else if (c == '=' && subtype != 0) {
1234 *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL];
1235 subtype = 0;
1236 } else if (c == CTLENDVAR) {
1237 *q++ = '}';
1238 } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE)
1239 cmdnleft++; /* ignore it */
1240 else
1241 *q++ = c;
1242 if (--cmdnleft <= 0) {
1243 *q++ = '.';
1244 *q++ = '.';
1245 *q++ = '.';
1246 break;
1247 }
1248 }
1249 cmdnextc = q;
1250}
1219 char c;
1220 int subtype = 0;
1221
1222 if (cmdnleft <= 0)
1223 return;
1224 p = s;
1225 q = cmdnextc;
1226 while ((c = *p++) != '\0') {
1227 if (c == CTLESC)
1228 *q++ = *p++;
1229 else if (c == CTLVAR) {
1230 *q++ = '$';
1231 if (--cmdnleft > 0)
1232 *q++ = '{';
1233 subtype = *p++;
1234 } else if (c == '=' && subtype != 0) {
1235 *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL];
1236 subtype = 0;
1237 } else if (c == CTLENDVAR) {
1238 *q++ = '}';
1239 } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE)
1240 cmdnleft++; /* ignore it */
1241 else
1242 *q++ = c;
1243 if (--cmdnleft <= 0) {
1244 *q++ = '.';
1245 *q++ = '.';
1246 *q++ = '.';
1247 break;
1248 }
1249 }
1250 cmdnextc = q;
1251}