xref: /titanic_52/usr/src/cmd/sh/jobs.c (revision 0eb822a1c0c2bea495647510b75f77f0e57633eb) 
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28 /*	  All Rights Reserved  	*/
29 
30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
31 /*
32  * Job control for UNIX Shell
33  */
34 
35 #include	<sys/termio.h>
36 #include	<sys/types.h>
37 #include	<sys/wait.h>
38 #include	<sys/param.h>
39 #include	<fcntl.h>
40 #include	<errno.h>
41 #include	"defs.h"
42 
43 /*
44  * one of these for each active job
45  */
46 
47 struct job
48 {
49 	struct job *j_nxtp;	/* next job in job ID order */
50 	struct job *j_curp;	/* next job in job currency order */
51 	struct termios j_stty;	/* termio save area when job stops */
52 	pid_t  j_pid;		/* job leader's process ID */
53 	pid_t  j_pgid;		/* job's process group ID */
54 	pid_t  j_tgid;		/* job's foreground process group ID */
55 	uint   j_jid;		/* job ID */
56 	ushort j_xval;		/* exit code, or exit or stop signal */
57 	ushort j_flag;		/* various status flags defined below */
58 	char  *j_pwd;		/* job's working directory */
59 	char  *j_cmd;		/* cmd used to invoke this job */
60 };
61 
62 /* defines for j_flag */
63 
64 #define	J_DUMPED	0001	/* job has core dumped */
65 #define	J_NOTIFY	0002	/* job has changed status */
66 #define	J_SAVETTY	0004	/* job was stopped in foreground, and its */
67 				/*   termio settings were saved */
68 #define	J_STOPPED	0010	/* job has been stopped */
69 #define	J_SIGNALED	0020	/* job has received signal; j_xval has it */
70 #define	J_DONE		0040	/* job has finished */
71 #define	J_RUNNING	0100	/* job is currently running */
72 #define	J_FOREGND	0200	/* job was put in foreground by shell */
73 
74 /* options to the printjob() function defined below */
75 
76 #define	PR_CUR		00001	/* print job currency ('+', '-', or ' ') */
77 #define	PR_JID		00002	/* print job ID				 */
78 #define	PR_PGID		00004	/* print job's process group ID		 */
79 #define	PR_STAT		00010	/* print status obtained from wait	 */
80 #define	PR_CMD		00020	/* print cmd that invoked job		 */
81 #define	PR_AMP		00040	/* print a '&' if in the background	 */
82 #define	PR_PWD		00100	/* print jobs present working directory	 */
83 
84 #define	PR_DFL		(PR_CUR|PR_JID|PR_STAT|PR_CMD) /* default options */
85 #define	PR_LONG		(PR_DFL|PR_PGID|PR_PWD)	/* long options */
86 
87 static struct termios 	mystty;	 /* default termio settings		 */
88 static int 		eofflg,
89 			jobcnt,	 /* number of active jobs		 */
90 			jobdone, /* number of active but finished jobs	 */
91 			jobnote; /* jobs requiring notification		 */
92 static pid_t		svpgid,	 /* saved process group ID		 */
93 			svtgid;	 /* saved foreground process group ID	 */
94 static struct job 	*jobcur, /* active jobs listed in currency order */
95 			**nextjob,
96 			*thisjob,
97 			*joblst; /* active jobs listed in job ID order	 */
98 
99 static void printjob(struct job *, int);
100 
101 pid_t
102 tcgetpgrp(fd)
103 {
104 	pid_t pgid;
105 	if (ioctl(fd, TIOCGPGRP, &pgid) == 0)
106 		return (pgid);
107 	return ((pid_t)-1);
108 }
109 
110 int
111 tcsetpgrp(fd, pgid)
112 int fd;
113 pid_t pgid;
114 {
115 	return (ioctl(fd, TIOCSPGRP, &pgid));
116 }
117 
118 static struct job *
119 pgid2job(pid_t pgid)
120 {
121 	struct job *jp;
122 
123 	for (jp = joblst; jp != 0 && jp->j_pid != pgid; jp = jp->j_nxtp)
124 		continue;
125 
126 	return (jp);
127 }
128 
129 static struct job *
130 str2job(char *cmd, char *job, int mustbejob)
131 {
132 	struct job *jp, *njp;
133 	int i;
134 
135 	if (*job != '%')
136 		jp = pgid2job(stoi(job));
137 	else if (*++job == 0 || *job == '+' || *job == '%' || *job == '-') {
138 		jp = jobcur;
139 		if (*job == '-' && jp)
140 			jp = jp->j_curp;
141 	} else if (*job >= '0' && *job <= '9') {
142 		i = stoi(job);
143 		for (jp = joblst; jp && jp->j_jid != i; jp = jp->j_nxtp)
144 			continue;
145 	} else if (*job == '?') {
146 		int j;
147 		char *p;
148 		i = strlen(++job);
149 		jp = 0;
150 		for (njp = jobcur; njp; njp = njp->j_curp) {
151 			if (njp->j_jid == 0)
152 				continue;
153 			for (p = njp->j_cmd, j = strlen(p); j >= i; p++, j--) {
154 				if (strncmp(job, p, i) == 0) {
155 					if (jp != 0)
156 						failed((unsigned char *)cmd,
157 						    ambiguous);
158 					jp = njp;
159 					break;
160 				}
161 			}
162 		}
163 	} else {
164 		i = strlen(job);
165 		jp = 0;
166 		for (njp = jobcur; njp; njp = njp->j_curp) {
167 			if (njp->j_jid == 0)
168 				continue;
169 			if (strncmp(job, njp->j_cmd, i) == 0) {
170 				if (jp != 0)
171 					failed((unsigned char *)cmd, ambiguous);
172 				jp = njp;
173 			}
174 		}
175 	}
176 
177 	if (mustbejob && (jp == 0 || jp->j_jid == 0))
178 		failed((unsigned char *)cmd, nosuchjob);
179 
180 	return (jp);
181 }
182 
183 static void
184 freejob(struct job *jp)
185 {
186 	struct job **njp;
187 	struct job **cjp;
188 
189 	for (njp = &joblst; *njp != jp; njp = &(*njp)->j_nxtp)
190 		continue;
191 
192 	for (cjp = &jobcur; *cjp != jp; cjp = &(*cjp)->j_curp)
193 		continue;
194 
195 	*njp = jp->j_nxtp;
196 	*cjp = jp->j_curp;
197 	free(jp);
198 	jobcnt--;
199 	jobdone--;
200 }
201 
202 /*
203  * Collect the foreground job.
204  * Used in the case where the subshell wants
205  * to exit, but needs to wait until the fg job
206  * is done.
207  */
208 void
209 collect_fg_job(void)
210 {
211 	struct job *jp;
212 	pid_t pid;
213 	int stat;
214 
215 	for (jp = joblst; jp; jp = jp->j_nxtp)
216 		if (jp->j_flag & J_FOREGND)
217 			break;
218 
219 	if (!jp)
220 		/* no foreground job */
221 		return;
222 
223 	/*
224 	 * Wait on fg job until wait succeeds
225 	 * or it fails due to no waitable children.
226 	 */
227 
228 	while (1) {
229 		errno = 0;
230 		pid = waitpid(jp->j_pid, &stat, 0);
231 		if (pid == jp->j_pid || (pid == -1 && errno == ECHILD))
232 			break;
233 	}
234 }
235 
236 /*
237  * analyze the status of a job
238  */
239 
240 static int
241 statjob(struct job *jp, int stat, int fg, int rc)
242 {
243 	pid_t tgid;
244 	int done = 0;
245 
246 	if (WIFCONTINUED(stat)) {
247 		if (jp->j_flag & J_STOPPED) {
248 			jp->j_flag &= ~(J_STOPPED|J_SIGNALED|J_SAVETTY);
249 			jp->j_flag |= J_RUNNING;
250 			if (!fg && jp->j_jid) {
251 				jp->j_flag |= J_NOTIFY;
252 				jobnote++;
253 			}
254 		}
255 	} else if (WIFSTOPPED(stat)) {
256 		jp->j_xval = WSTOPSIG(stat);
257 		jp->j_flag &= ~J_RUNNING;
258 		jp->j_flag |= (J_SIGNALED|J_STOPPED);
259 		jp->j_pgid = getpgid(jp->j_pid);
260 		jp->j_tgid = jp->j_pgid;
261 		if (fg) {
262 			if (tgid = settgid(mypgid, jp->j_pgid))
263 				jp->j_tgid = tgid;
264 			else {
265 				jp->j_flag |= J_SAVETTY;
266 				tcgetattr(0, &jp->j_stty);
267 				(void) tcsetattr(0, TCSANOW, &mystty);
268 			}
269 		}
270 		if (jp->j_jid) {
271 			jp->j_flag |= J_NOTIFY;
272 			jobnote++;
273 		}
274 	} else {
275 		jp->j_flag &= ~J_RUNNING;
276 		jp->j_flag |= J_DONE;
277 		done++;
278 		jobdone++;
279 		if (WIFSIGNALED(stat)) {
280 			jp->j_xval = WTERMSIG(stat);
281 			jp->j_flag |= J_SIGNALED;
282 			if (WCOREDUMP(stat))
283 				jp->j_flag |= J_DUMPED;
284 			if (!fg || jp->j_xval != SIGINT) {
285 				jp->j_flag |= J_NOTIFY;
286 				jobnote++;
287 			}
288 		} else { /* WIFEXITED */
289 			jp->j_xval = WEXITSTATUS(stat);
290 			jp->j_flag &= ~J_SIGNALED;
291 			if (!fg && jp->j_jid) {
292 				jp->j_flag |= J_NOTIFY;
293 				jobnote++;
294 			}
295 		}
296 		if (fg) {
297 			if (!settgid(mypgid, jp->j_pgid) ||
298 			    !settgid(mypgid, getpgid(jp->j_pid)))
299 				tcgetattr(0, &mystty);
300 		}
301 	}
302 	if (rc) {
303 		exitval = jp->j_xval;
304 		if (jp->j_flag & J_SIGNALED)
305 			exitval |= SIGFLG;
306 		exitset();
307 	}
308 	if (done && !(jp->j_flag & J_NOTIFY))
309 		freejob(jp);
310 	return (done);
311 }
312 
313 /*
314  * collect the status of jobs that have recently exited or stopped -
315  * if wnohang == WNOHANG, wait until error, or all jobs are accounted for;
316  *
317  * called after each command is executed, with wnohang == 0, and as part
318  * of "wait" builtin with wnohang == WNOHANG
319  *
320  * We do not need to call chktrap here if waitpid(2) is called with
321  * wnohang == 0, because that only happens from syswait() which is called
322  * from builtin() where chktrap() is already called.
323  */
324 
325 static void
326 collectjobs(wnohang)
327 {
328 	pid_t pid;
329 	struct job *jp;
330 	int stat, n;
331 	int wflags;
332 
333 	if ((flags & (monitorflg|jcflg|jcoff)) == (monitorflg|jcflg))
334 		wflags = WUNTRACED|WCONTINUED;
335 	else
336 		wflags = 0;
337 
338 	for (n = jobcnt - jobdone; n > 0; n--) {
339 		if ((pid = waitpid(-1, &stat, wnohang|wflags)) <= 0)
340 			break;
341 		if (jp = pgid2job(pid))
342 			(void) statjob(jp, stat, 0, 0);
343 	}
344 
345 }
346 
347 void
348 freejobs()
349 {
350 	struct job *jp;
351 
352 	collectjobs(WNOHANG);
353 
354 	if (jobnote) {
355 		int savefd = setb(2);
356 		for (jp = joblst; jp; jp = jp->j_nxtp) {
357 			if (jp->j_flag & J_NOTIFY) {
358 				if (jp->j_jid)
359 					printjob(jp, PR_DFL);
360 				else if (jp->j_flag & J_FOREGND)
361 					printjob(jp, PR_STAT);
362 				else
363 					printjob(jp, PR_STAT|PR_PGID);
364 			}
365 		}
366 		(void) setb(savefd);
367 	}
368 
369 	if (jobdone) {
370 		for (jp = joblst; jp; jp = jp->j_nxtp) {
371 			if (jp->j_flag & J_DONE)
372 				freejob(jp);
373 		}
374 	}
375 }
376 
377 static void
378 waitjob(struct job *jp)
379 {
380 	int stat;
381 	int done;
382 	pid_t pid = jp->j_pid;
383 	int wflags;
384 	int ret = 0;
385 	int	err = 0;
386 
387 	if ((flags & (monitorflg|jcflg|jcoff)) == (monitorflg|jcflg))
388 		wflags = WUNTRACED;
389 	else
390 		wflags = 0;
391 	do {
392 		errno = 0;
393 		ret = waitpid(pid, &stat, wflags|WNOWAIT);
394 		err = errno;
395 		if (ret == -1 && err == ECHILD) {
396 			stat = 0;
397 			break;
398 		}
399 	} while (ret != pid);
400 
401 	done = statjob(jp, stat, 1, 1);
402 	waitpid(pid, 0, wflags);
403 	if (done && exitval && (flags & errflg))
404 		exitsh(exitval);
405 	flags |= eflag;
406 }
407 
408 /*
409  * modify the foreground process group to *new* only if the
410  * current foreground process group is equal to *expected*
411  */
412 
413 int
414 settgid(new, expected)
415 pid_t new, expected;
416 {
417 	pid_t current = tcgetpgrp(0);
418 
419 	if (current != expected)
420 		return (current);
421 
422 	if (new != current)
423 		tcsetpgrp(0, new);
424 
425 	return (0);
426 }
427 
428 static void
429 restartjob(struct job *jp, int fg)
430 {
431 	if (jp != jobcur) {
432 		struct job *t;
433 		for (t = jobcur; t->j_curp != jp; t = t->j_curp);
434 		t->j_curp = jp->j_curp;
435 		jp->j_curp = jobcur;
436 		jobcur = jp;
437 	}
438 	if (fg) {
439 		if (jp->j_flag & J_SAVETTY) {
440 			jp->j_stty.c_lflag &= ~TOSTOP;
441 			jp->j_stty.c_lflag |= (mystty.c_lflag&TOSTOP);
442 			jp->j_stty.c_cc[VSUSP] = mystty.c_cc[VSUSP];
443 			jp->j_stty.c_cc[VDSUSP] = mystty.c_cc[VDSUSP];
444 			(void) tcsetattr(0, TCSADRAIN, &jp->j_stty);
445 		}
446 		(void) settgid(jp->j_tgid, mypgid);
447 	}
448 	(void) kill(-(jp->j_pgid), SIGCONT);
449 	if (jp->j_tgid != jp->j_pgid)
450 		(void) kill(-(jp->j_tgid), SIGCONT);
451 	jp->j_flag &= ~(J_STOPPED|J_SIGNALED|J_SAVETTY);
452 	jp->j_flag |= J_RUNNING;
453 	if (fg)  {
454 		jp->j_flag |= J_FOREGND;
455 		printjob(jp, PR_JID|PR_CMD);
456 		waitjob(jp);
457 	} else {
458 		jp->j_flag &= ~J_FOREGND;
459 		printjob(jp, PR_JID|PR_CMD|PR_AMP);
460 	}
461 }
462 
463 static void
464 printjob(struct job *jp, int propts)
465 {
466 	int sp = 0;
467 
468 	if (jp->j_flag & J_NOTIFY) {
469 		jobnote--;
470 		jp->j_flag &= ~J_NOTIFY;
471 	}
472 
473 	if (propts & PR_JID) {
474 		prc_buff('[');
475 		prn_buff(jp->j_jid);
476 		prc_buff(']');
477 		sp = 1;
478 	}
479 
480 	if (propts & PR_CUR) {
481 		while (sp-- > 0)
482 			prc_buff(SPACE);
483 		sp = 1;
484 		if (jobcur == jp)
485 			prc_buff('+');
486 		else if (jobcur != 0 && jobcur->j_curp == jp)
487 			prc_buff('-');
488 		else
489 			sp++;
490 	}
491 
492 	if (propts & PR_PGID) {
493 		while (sp-- > 0)
494 			prc_buff(SPACE);
495 		prn_buff(jp->j_pid);
496 		sp = 1;
497 	}
498 
499 	if (propts & PR_STAT) {
500 		char	*gmsg;
501 		while (sp-- > 0)
502 			prc_buff(SPACE);
503 		sp = 28;
504 		if (jp->j_flag & J_SIGNALED) {
505 			char *sigstr, *strsignal();
506 			if ((sigstr = strsignal(jp->j_xval)) != NULL) {
507 				sp -= strlen(sigstr);
508 				prs_buff(sigstr);
509 			} else {
510 				itos(jp->j_xval);
511 				gmsg = gettext(signalnum);
512 				sp -= strlen(numbuf) + strlen(gmsg);
513 				prs_buff((unsigned char *)gmsg);
514 				prs_buff(numbuf);
515 			}
516 			if (jp->j_flag & J_DUMPED) {
517 				gmsg = gettext(coredump);
518 				sp -= strlen(gmsg);
519 				prs_buff((unsigned char *)gmsg);
520 			}
521 		} else if (jp->j_flag & J_DONE) {
522 			itos(jp->j_xval);
523 			gmsg = gettext(exited);
524 			sp -= strlen(gmsg) + strlen(numbuf) + 2;
525 			prs_buff((unsigned char *)gmsg);
526 			prc_buff('(');
527 			itos(jp->j_xval);
528 			prs_buff(numbuf);
529 			prc_buff(')');
530 		} else {
531 			gmsg = gettext(running);
532 			sp -= strlen(gmsg);
533 			prs_buff((unsigned char *)gmsg);
534 		}
535 		if (sp < 1)
536 			sp = 1;
537 	}
538 
539 	if (propts & PR_CMD) {
540 		while (sp-- > 0)
541 			prc_buff(SPACE);
542 		prs_buff(jp->j_cmd);
543 		sp = 1;
544 	}
545 
546 	if (propts & PR_AMP) {
547 		while (sp-- > 0)
548 			prc_buff(SPACE);
549 		prc_buff('&');
550 		sp = 1;
551 	}
552 
553 	if (propts & PR_PWD) {
554 		while (sp-- > 0)
555 			prc_buff(SPACE);
556 		prs_buff("(wd: ");
557 		prs_buff(jp->j_pwd);
558 		prc_buff(')');
559 	}
560 
561 	prc_buff(NL);
562 	flushb();
563 
564 }
565 
566 
567 /*
568  * called to initialize job control for each new input file to the shell,
569  * and after the "exec" builtin
570  */
571 
572 void
573 startjobs()
574 {
575 	svpgid = mypgid;
576 
577 	if (tcgetattr(0, &mystty) == -1 || (svtgid = tcgetpgrp(0)) == -1) {
578 		flags &= ~jcflg;
579 		return;
580 	}
581 
582 	flags |= jcflg;
583 
584 	handle(SIGTTOU, SIG_IGN);
585 	handle(SIGTSTP, SIG_DFL);
586 
587 	if (mysid != mypgid) {
588 		setpgid(0, 0);
589 		mypgid = mypid;
590 		(void) settgid(mypgid, svpgid);
591 	}
592 
593 }
594 
595 int
596 endjobs(check_if)
597 int check_if;
598 {
599 	if ((flags & (jcoff|jcflg)) != jcflg)
600 		return (1);
601 
602 	if (check_if && jobcnt && eofflg++ == 0) {
603 		struct job *jp;
604 		if (check_if & JOB_STOPPED) {
605 			for (jp = joblst; jp; jp = jp->j_nxtp) {
606 				if (jp->j_jid && (jp->j_flag & J_STOPPED)) {
607 					prs(_gettext(jobsstopped));
608 					prc(NL);
609 					return (0);
610 				}
611 			}
612 		}
613 		if (check_if & JOB_RUNNING) {
614 			for (jp = joblst; jp; jp = jp->j_nxtp) {
615 				if (jp->j_jid && (jp->j_flag & J_RUNNING)) {
616 					prs(_gettext(jobsrunning));
617 					prc(NL);
618 					return (0);
619 				}
620 			}
621 		}
622 	}
623 
624 	if (svpgid != mypgid) {
625 		(void) settgid(svtgid, mypgid);
626 		setpgid(0, svpgid);
627 	}
628 
629 	return (1);
630 }
631 
632 
633 /*
634  * called by the shell to reserve a job slot for a job about to be spawned
635  */
636 
637 void
638 deallocjob()
639 {
640 	free(thisjob);
641 	jobcnt--;
642 }
643 
644 void
645 allocjob(char *cmd, unchar *cwd, int monitor)
646 {
647 	struct job *jp, **jpp;
648 	int jid, cmdlen, cwdlen;
649 
650 	cmdlen = strlen(cmd) + 1;
651 	if (cmd[cmdlen-2] == '&') {
652 		cmd[cmdlen-3] = 0;
653 		cmdlen -= 2;
654 	}
655 	cwdlen = strlen(cwd) + 1;
656 	jp = (struct job *) alloc(sizeof (struct job) + cmdlen + cwdlen);
657 	if (jp == 0)
658 		error(nostack);
659 	jobcnt++;
660 	jp->j_cmd = ((char *)jp) + sizeof (struct job);
661 	strcpy(jp->j_cmd, cmd);
662 	jp->j_pwd = jp->j_cmd + cmdlen;
663 	strcpy(jp->j_pwd, cwd);
664 
665 	jpp = &joblst;
666 
667 	if (monitor) {
668 		for (; *jpp; jpp = &(*jpp)->j_nxtp)
669 			if ((*jpp)->j_jid != 0)
670 				break;
671 		for (jid = 1; *jpp; jpp = &(*jpp)->j_nxtp, jid++)
672 			if ((*jpp)->j_jid != jid)
673 				break;
674 	} else
675 		jid = 0;
676 
677 	jp->j_jid = jid;
678 	nextjob = jpp;
679 	thisjob = jp;
680 }
681 
682 void
683 clearjobs(void)
684 {
685 	struct job *jp, *sjp;
686 
687 	for (jp = joblst; jp; jp = sjp) {
688 		sjp = jp->j_nxtp;
689 		free(jp);
690 	}
691 	joblst = NULL;
692 	jobcnt = 0;
693 	jobnote = 0;
694 	jobdone = 0;
695 
696 }
697 
698 void
699 makejob(int monitor, int fg)
700 {
701 	if (monitor) {
702 		mypgid = mypid;
703 		setpgid(0, 0);
704 		if (fg)
705 			tcsetpgrp(0, mypid);
706 		handle(SIGTTOU, SIG_DFL);
707 		handle(SIGTSTP, SIG_DFL);
708 	} else if (!fg) {
709 #ifdef NICE
710 		nice(NICE);
711 #endif
712 		handle(SIGTTIN, SIG_IGN);
713 		handle(SIGINT,  SIG_IGN);
714 		handle(SIGQUIT, SIG_IGN);
715 		if (!ioset)
716 			renamef(chkopen(devnull, 0), 0);
717 	}
718 }
719 
720 /*
721  * called by the shell after job has been spawned, to fill in the
722  * job slot, and wait for the job if in the foreground
723  */
724 
725 void
726 postjob(pid, fg)
727 pid_t pid;
728 int fg;
729 {
730 
731 	int propts;
732 
733 	thisjob->j_nxtp = *nextjob;
734 	*nextjob = thisjob;
735 	thisjob->j_curp = jobcur;
736 	jobcur = thisjob;
737 
738 	if (thisjob->j_jid) {
739 		thisjob->j_pgid = pid;
740 		propts = PR_JID|PR_PGID;
741 	} else {
742 		thisjob->j_pgid = mypgid;
743 		propts = PR_PGID;
744 	}
745 
746 	thisjob->j_flag = J_RUNNING;
747 	thisjob->j_tgid = thisjob->j_pgid;
748 	thisjob->j_pid = pid;
749 	eofflg = 0;
750 
751 	if (fg) {
752 		thisjob->j_flag |= J_FOREGND;
753 		waitjob(thisjob);
754 	} else  {
755 		if (flags & ttyflg)
756 			printjob(thisjob, propts);
757 		assnum(&pcsadr, (long)pid);
758 	}
759 }
760 
761 /*
762  * the builtin "jobs" command
763  */
764 
765 void
766 sysjobs(argc, argv)
767 int argc;
768 char *argv[];
769 {
770 	char *cmd = *argv;
771 	struct job *jp;
772 	int propts, c;
773 	extern int opterr, i;
774 	int savoptind = optind;
775 	int loptind = -1;
776 	int savopterr = opterr;
777 	int savsp = _sp;
778 	char *savoptarg = optarg;
779 	optind = 1;
780 	opterr = 0;
781 	_sp = 1;
782 	propts = 0;
783 
784 	if ((flags & jcflg) == 0)
785 		failed((unsigned char *)cmd, nojc);
786 
787 	while ((c = getopt(argc, argv, "lpx")) != -1) {
788 		if (propts) {
789 			gfailure(usage, jobsuse);
790 			goto err;
791 		}
792 		switch (c) {
793 			case 'x':
794 				propts = -1;
795 				break;
796 			case 'p':
797 				propts = PR_PGID;
798 				break;
799 			case 'l':
800 				propts = PR_LONG;
801 				break;
802 			case '?':
803 				gfailure(usage, jobsuse);
804 				goto err;
805 		}
806 	}
807 
808 	loptind = optind;
809 err:
810 	optind = savoptind;
811 	optarg = savoptarg;
812 	opterr = savopterr;
813 	_sp = savsp;
814 	if (loptind == -1)
815 		return;
816 
817 	if (propts == -1) {
818 		unsigned char *bp;
819 		char *cp;
820 		unsigned char *savebp;
821 		for (savebp = bp = locstak(); loptind < argc; loptind++) {
822 			cp = argv[loptind];
823 			if (*cp == '%') {
824 				jp = str2job(cmd, cp, 1);
825 				itos(jp->j_pid);
826 				cp = (char *)numbuf;
827 			}
828 			while (*cp) {
829 				if (bp >= brkend)
830 					growstak(bp);
831 				*bp++ = *cp++;
832 			}
833 			if (bp >= brkend)
834 				growstak(bp);
835 			*bp++ = SPACE;
836 		}
837 		endstak(bp);
838 		execexp(savebp, 0);
839 		return;
840 	}
841 
842 	collectjobs(WNOHANG);
843 
844 	if (propts == 0)
845 		propts = PR_DFL;
846 
847 	if (loptind == argc) {
848 		for (jp = joblst; jp; jp = jp->j_nxtp) {
849 			if (jp->j_jid)
850 				printjob(jp, propts);
851 		}
852 	} else do
853 		printjob(str2job(cmd, argv[loptind++], 1), propts);
854 	while (loptind < argc);
855 
856 }
857 
858 /*
859  * the builtin "fg" and "bg" commands
860  */
861 void
862 sysfgbg(int argc, char *argv[])
863 {
864 	char *cmd = *argv;
865 	int fg;
866 
867 	if ((flags & jcflg) == 0)
868 		failed((unsigned char *)cmd, nojc);
869 
870 	fg = eq("fg", cmd);
871 
872 	if (*++argv == 0) {
873 		struct job *jp;
874 		for (jp = jobcur; ; jp = jp->j_curp) {
875 			if (jp == 0)
876 				failed((unsigned char *)cmd, nocurjob);
877 			if (jp->j_jid)
878 				break;
879 		}
880 		restartjob(jp, fg);
881 	}
882 
883 	else do
884 		restartjob(str2job(cmd, *argv, 1), fg);
885 	while (*++argv);
886 
887 }
888 
889 /*
890  * the builtin "wait" commands
891  */
892 
893 void
894 syswait(argc, argv)
895 int argc;
896 char *argv[];
897 {
898 	char *cmd = *argv;
899 	struct job *jp;
900 	int stat;
901 	int wflags;
902 
903 	if ((flags & (monitorflg|jcflg|jcoff)) == (monitorflg|jcflg))
904 		wflags = WUNTRACED;
905 	else
906 		wflags = 0;
907 
908 	if (argc == 1)
909 		collectjobs(0);
910 	else while (--argc) {
911 		if ((jp = str2job(cmd, *++argv, 0)) == 0)
912 			continue;
913 		if (!(jp->j_flag & J_RUNNING))
914 			continue;
915 		if (waitpid(jp->j_pid, &stat, wflags) <= 0)
916 			break;
917 		(void) statjob(jp, stat, 0, 1);
918 	}
919 }
920 
921 static void
922 sigv(char *cmd, int sig, char *args)
923 {
924 	int pgrp = 0;
925 	int stopme = 0;
926 	pid_t id;
927 
928 	if (*args == '%') {
929 		struct job *jp;
930 		jp = str2job(cmd, args, 1);
931 		id = jp->j_pgid;
932 		pgrp++;
933 	} else {
934 		if (*args == '-') {
935 			pgrp++;
936 			args++;
937 		}
938 		id = 0;
939 		do {
940 			if (*args < '0' || *args > '9') {
941 				failure(cmd, badid);
942 				return;
943 			}
944 			id = (id * 10) + (*args - '0');
945 		} while (*++args);
946 		if (id == 0) {
947 			id = mypgid;
948 			pgrp++;
949 		}
950 	}
951 
952 	if (sig == SIGSTOP) {
953 		if (id == mysid || id == mypid && mypgid == mysid) {
954 			failure(cmd, loginsh);
955 			return;
956 		}
957 		if (id == mypgid && mypgid != svpgid) {
958 			(void) settgid(svtgid, mypgid);
959 			setpgid(0, svpgid);
960 			stopme++;
961 		}
962 	}
963 
964 	if (pgrp)
965 		id = -id;
966 
967 	if (kill(id, sig) < 0) {
968 
969 		switch (errno) {
970 			case EPERM:
971 				failure(cmd, eacces);
972 				break;
973 
974 			case EINVAL:
975 				failure(cmd, badsig);
976 				break;
977 
978 			default:
979 				if (pgrp)
980 					failure(cmd, nosuchpgid);
981 				else
982 					failure(cmd, nosuchpid);
983 				break;
984 		}
985 
986 	} else if (sig == SIGTERM && pgrp)
987 		(void) kill(id, SIGCONT);
988 
989 	if (stopme) {
990 		setpgid(0, mypgid);
991 		(void) settgid(mypgid, svpgid);
992 	}
993 
994 }
995 
996 void
997 sysstop(int argc, char *argv[])
998 {
999 	char *cmd = *argv;
1000 	if (argc <= 1) {
1001 		gfailure(usage, stopuse);
1002 		return;
1003 	}
1004 	while (*++argv)
1005 		sigv(cmd, SIGSTOP, *argv);
1006 }
1007 
1008 void
1009 syskill(int argc, char *argv[])
1010 {
1011 	char *cmd = *argv;
1012 	int sig = SIGTERM;
1013 
1014 	if (argc == 1) {
1015 		gfailure(usage, killuse);
1016 		return;
1017 	}
1018 
1019 	if (argv[1][0] == '-') {
1020 
1021 		if (argc == 2) {
1022 
1023 			int i;
1024 			int cnt = 0;
1025 			char sep = 0;
1026 			char buf[12];
1027 
1028 			if (!eq(argv[1], "-l")) {
1029 				gfailure(usage, killuse);
1030 				return;
1031 			}
1032 
1033 			for (i = 1; i < MAXTRAP; i++) {
1034 				if (sig2str(i, buf) < 0)
1035 					continue;
1036 				if (sep)
1037 					prc_buff(sep);
1038 				prs_buff(buf);
1039 				if ((flags & ttyflg) && (++cnt % 10))
1040 					sep = TAB;
1041 				else
1042 					sep = NL;
1043 			}
1044 			prc_buff(NL);
1045 			return;
1046 		}
1047 
1048 		if (str2sig(&argv[1][1], &sig)) {
1049 			failure(cmd, badsig);
1050 			return;
1051 		}
1052 		argv++;
1053 	}
1054 
1055 	while (*++argv)
1056 		sigv(cmd, sig, *argv);
1057 
1058 }
1059 
1060 void
1061 syssusp(int argc, char *argv[])
1062 {
1063 	if (argc != 1)
1064 		failed((unsigned char *)argv[0], badopt);
1065 	sigv(argv[0], SIGSTOP, "0");
1066 }
1067