[unix-history] / usr / src / sys / kern / kern_exit.c

/*
 * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *	@(#)kern_exit.c	7.7 (Berkeley) %G%
 */

#include "param.h"
#include "systm.h"
#include "map.h"
#include "user.h"
#include "kernel.h"
#include "proc.h"
#include "buf.h"
#include "wait.h"
#include "vm.h"
#include "file.h"
#include "vnode.h"
#include "tty.h"
#include "syslog.h"
#include "malloc.h"

#include "machine/reg.h"
#ifdef COMPAT_43
#include "machine/psl.h"
#endif

/*
 * Exit system call: pass back caller's arg
 */
rexit()
{
	register struct a {
		int	rval;
	} *uap;
	union wait status;

	uap = (struct a *)u.u_ap;
	status.w_status = 0;
	status.w_retcode = uap->rval;
	exit(status.w_status);
}

/*
 * Release resources.
 * Save u. area for parent to look at.
 * Enter zombie state.
 * Wake up parent and init processes,
 * and dispose of children.
 */
exit(rv)
	int rv;			/* should be union wait (XXX) */
{
	register int i;
	register struct proc *p, *q, *nq;
	register int x;

#ifdef PGINPROF
	vmsizmon();
#endif
	p = u.u_procp;
	MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage),
		M_ZOMBIE, M_WAITOK);
	p->p_flag &= ~(STRC|SULOCK);
	p->p_flag |= SWEXIT;
	p->p_sigignore = ~0;
	p->p_cpticks = 0;
	p->p_pctcpu = 0;
	for (i = 0; i < NSIG; i++)
		u.u_signal[i] = SIG_IGN;
	untimeout(realitexpire, (caddr_t)p);
	/*
	 * Release virtual memory.  If we resulted from
	 * a vfork(), instead give the resources back to
	 * the parent.
	 */
	if ((p->p_flag & SVFORK) == 0)
		vrelvm();
	else {
		p->p_flag &= ~SVFORK;
		wakeup((caddr_t)p);
		while ((p->p_flag & SVFDONE) == 0)
			sleep((caddr_t)p, PZERO - 1);
		p->p_flag &= ~SVFDONE;
	}
	for (i = 0; i <= u.u_lastfile; i++) {
		struct file *f;

		f = u.u_ofile[i];
		if (f) {
			u.u_ofile[i] = NULL;
			u.u_pofile[i] = 0;
			closef(f);
		}
	}
	if (SESS_LEADER(p)) {
		p->p_session->s_leader = 0;
		/* TODO: vhangup(); */
		if (u.u_ttyp) {
			u.u_ttyp->t_session = 0;
			u.u_ttyp->t_pgid = 0;
		}
	}
	VOP_LOCK(u.u_cdir);
	vput(u.u_cdir);
	if (u.u_rdir) {
		VOP_LOCK(u.u_rdir);
		vput(u.u_rdir);
	}
	u.u_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
	acct();
#ifdef QUOTA
	qclean();
#endif
	crfree(u.u_cred);
#ifdef KTRACE
	/* 
	 * release trace file
	 */
	if (p->p_tracep)
		vrele(p->p_tracep);
#endif
	/*
	/*
	 * Freeing the user structure and kernel stack
	 * for the current process: have to run a bit longer
	 * using the pages which are about to be freed...
	 * vrelu will block memory allocation by raising ipl.
	 */
	vrelu(u.u_procp, 0);
	vrelpt(u.u_procp);
	if (*p->p_prev = p->p_nxt)		/* off allproc queue */
		p->p_nxt->p_prev = p->p_prev;
	if (p->p_nxt = zombproc)		/* onto zombproc */
		p->p_nxt->p_prev = &p->p_nxt;
	p->p_prev = &zombproc;
	zombproc = p;
	multprog--;
	p->p_stat = SZOMB;
	noproc = 1;
	i = PIDHASH(p->p_pid);
	x = p - proc;
	if (pidhash[i] == x)
		pidhash[i] = p->p_idhash;
	else {
		for (i = pidhash[i]; i != 0; i = proc[i].p_idhash)
			if (proc[i].p_idhash == x) {
				proc[i].p_idhash = p->p_idhash;
				goto done;
			}
		panic("exit");
	}
	if (p->p_pid == 1) {
		if (p->p_dsize == 0) {
			printf("Can't exec init (errno %d)\n", rv >> 8);
			for (;;)
				;
		} else
			panic("init died");
	}
done:
	p->p_xstat = rv;
	*p->p_ru = u.u_ru;
	ruadd(p->p_ru, &u.u_cru);
	if (p->p_cptr)		/* only need this if any child is S_ZOMB */
		wakeup((caddr_t)&proc[1]);
	if (PGRP_JOBC(p))
		p->p_pgrp->pg_jobc--;
	for (q = p->p_cptr; q != NULL; q = nq) {
		if (PGRP_JOBC(q))
			q->p_pgrp->pg_jobc--;
		nq = q->p_osptr;
		if (nq != NULL)
			nq->p_ysptr = NULL;
		if (proc[1].p_cptr)
			proc[1].p_cptr->p_ysptr = q;
		q->p_osptr = proc[1].p_cptr;
		q->p_ysptr = NULL;
		proc[1].p_cptr = q;

		q->p_pptr = &proc[1];
		q->p_ppid = 1;
		/*
		 * Traced processes are killed
		 * since their existence means someone is screwing up.
		 * Stopped processes are sent a hangup and a continue.
		 * This is designed to be ``safe'' for setuid
		 * processes since they must be willing to tolerate
		 * hangups anyways.
		 */
		if (q->p_flag&STRC) {
			q->p_flag &= ~STRC;
			psignal(q, SIGKILL);
		} else if (q->p_stat == SSTOP) {
			psignal(q, SIGHUP);
			psignal(q, SIGCONT);
		}
		/*
		 * Protect this process from future
		 * tty signals, clear TSTP/TTIN/TTOU if pending.
		 */
		(void) spgrp(q);
	}
	p->p_cptr = NULL;
	psignal(p->p_pptr, SIGCHLD);
	wakeup((caddr_t)p->p_pptr);
#if defined(tahoe)
	dkeyrelease(p->p_dkey), p->p_dkey = 0;
	ckeyrelease(p->p_ckey), p->p_ckey = 0;
	u.u_pcb.pcb_savacc.faddr = (float *)NULL;
#endif
	swtch();
}

#ifdef COMPAT_43
owait()
{
	struct a {
		int	pid;
		union	wait *status;
		int	options;
		struct	rusage *rusage;
	} *uap = (struct a *)u.u_ap;

	if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) {
		uap->options = WSIGRESTART;
		uap->rusage = 0;
	} else {
		uap->options = u.u_ar0[R0] | WSIGRESTART;
		uap->rusage = (struct rusage *)u.u_ar0[R1];
	}
	uap->pid = WAIT_ANY;
	uap->status = 0;
	wait1(1);
}

wait4()
{
	wait1(0);
}
#endif

/*
 * Wait system call.
 * Search for a terminated (zombie) child,
 * finally lay it to rest, and collect its status.
 * Look also for stopped (traced) children,
 * and pass back status from them.
 */
#ifdef COMPAT_43
wait1(compat)
	int compat;
#else
wait4()
#endif
{
	register struct a {
		int	pid;
		union	wait *status;
		int	options;
		struct	rusage *rusage;
	} *uap = (struct a *)u.u_ap;
	register f;
	register struct proc *p, *q;
	union wait status;

	f = 0;
	q = u.u_procp;
	if (uap->pid == 0)
		uap->pid = -q->p_pgid;
	if (uap->options &~ (WUNTRACED|WNOHANG|WSIGRESTART)) {
		u.u_error = EINVAL;
		return;
	}
loop:
	for (p = q->p_cptr; p; p = p->p_osptr) {
		if (uap->pid != WAIT_ANY &&
		    p->p_pid != uap->pid && p->p_pgid != -uap->pid)
			continue;
		f++;
		if (p->p_stat == SZOMB) {
			pgrm(p);			/* off pgrp */
			u.u_r.r_val1 = p->p_pid;
#ifdef COMPAT_43
			if (compat)
				u.u_r.r_val2 = p->p_xstat;
			else
#endif
			if (uap->status) {
				status.w_status = p->p_xstat;
				if (u.u_error = copyout((caddr_t)&status,
				    (caddr_t)uap->status, sizeof(status)))
					return;
			}
			p->p_xstat = 0;
			if (uap->rusage)
				u.u_error = copyout((caddr_t)p->p_ru,
				    (caddr_t)uap->rusage,
				    sizeof (struct rusage));
			ruadd(&u.u_cru, p->p_ru);
			FREE(p->p_ru, M_ZOMBIE);
			p->p_ru = 0;
			p->p_stat = NULL;
			p->p_pid = 0;
			p->p_ppid = 0;
			if (*p->p_prev = p->p_nxt)	/* off zombproc */
				p->p_nxt->p_prev = p->p_prev;
			p->p_nxt = freeproc;		/* onto freeproc */
			freeproc = p;
			if (q = p->p_ysptr)
				q->p_osptr = p->p_osptr;
			if (q = p->p_osptr)
				q->p_ysptr = p->p_ysptr;
			if ((q = p->p_pptr)->p_cptr == p)
				q->p_cptr = p->p_osptr;
			p->p_pptr = 0;
			p->p_ysptr = 0;
			p->p_osptr = 0;
			p->p_cptr = 0;
			p->p_sig = 0;
			p->p_sigcatch = 0;
			p->p_sigignore = 0;
			p->p_sigmask = 0;
			/*p->p_pgrp = 0;*/
			p->p_flag = 0;
			p->p_wchan = 0;
			p->p_cursig = 0;
			return;
		}
		if (p->p_stat == SSTOP && (p->p_flag & SWTED) == 0 &&
		    (p->p_flag & STRC || uap->options & WUNTRACED)) {
			p->p_flag |= SWTED;
			u.u_r.r_val1 = p->p_pid;
#ifdef COMPAT_43
			if (compat)
				u.u_r.r_val2 = (p->p_cursig<<8) | WSTOPPED;
			else
#endif
			if (uap->status) {
				status.w_status = 0;
				status.w_stopval = WSTOPPED;
				status.w_stopsig = p->p_cursig;
				u.u_error = copyout((caddr_t)&status,
				    (caddr_t)uap->status, sizeof(status));
			}
			return;
		}
	}
	if (f == 0) {
		u.u_error = ECHILD;
		return;
	}
	if (uap->options & WNOHANG) {
		u.u_r.r_val1 = 0;
		return;
	}
	if (uap->options & WSIGRESTART && setjmp(&u.u_qsave)) {
		p = u.u_procp;
		if ((u.u_sigintr & sigmask(p->p_cursig)) != 0) {
			u.u_error = EINTR;
			return;
		}
		u.u_eosys = RESTARTSYS;
		return;
	}
	sleep((caddr_t)u.u_procp, PWAIT);
	goto loop;
}
Commit	Line	Data
da7c5cc6	1	/*
c4ec2128 KM	2	* Copyright (c) 1982, 1986, 1989 Regents of the University of California.
c4ec2128 KM	3	* All rights reserved.
da7c5cc6	4	*
c4ec2128 KM	5	* Redistribution and use in source and binary forms are permitted
	6	* provided that the above copyright notice and this paragraph are
	7	* duplicated in all such forms and that any documentation,
	8	* advertising materials, and other materials related to such
	9	* distribution and use acknowledge that the software was developed
	10	* by the University of California, Berkeley. The name of the
	11	* University may not be used to endorse or promote products derived
	12	* from this software without specific prior written permission.
	13	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	15	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
	16	*
	17	* @(#)kern_exit.c 7.7 (Berkeley) %G%
da7c5cc6	18	*/
a8560fa0	19
94368568 JB	20	#include "param.h"
	21	#include "systm.h"
	22	#include "map.h"
94368568 JB	23	#include "user.h"
	24	#include "kernel.h"
	25	#include "proc.h"
	26	#include "buf.h"
	27	#include "wait.h"
	28	#include "vm.h"
	29	#include "file.h"
c4ec2128	30	#include "vnode.h"
1ad494e6	31	#include "tty.h"
5e63dd78	32	#include "syslog.h"
61d22ffc	33	#include "malloc.h"
a8560fa0	34
d301d150	35	#include "machine/reg.h"
1ad494e6	36	#ifdef COMPAT_43
d301d150	37	#include "machine/psl.h"
1ad494e6 MK	38	#endif
1ad494e6 MK	39
a8560fa0 SL	40	/*
	41	* Exit system call: pass back caller's arg
	42	*/
	43	rexit()
	44	{
	45	register struct a {
	46	int rval;
	47	} *uap;
1ad494e6	48	union wait status;
a8560fa0 SL	49
a8560fa0 SL	50	uap = (struct a *)u.u_ap;
1ad494e6 MK	51	status.w_status = 0;
	52	status.w_retcode = uap->rval;
	53	exit(status.w_status);
a8560fa0 SL	54	}
	55
	56	/*
	57	* Release resources.
	58	* Save u. area for parent to look at.
	59	* Enter zombie state.
	60	* Wake up parent and init processes,
	61	* and dispose of children.
	62	*/
	63	exit(rv)
1ad494e6	64	int rv; /* should be union wait (XXX) */
a8560fa0 SL	65	{
a8560fa0 SL	66	register int i;
1d348849	67	register struct proc p, q, *nq;
a8560fa0	68	register int x;
a8560fa0 SL	69
	70	#ifdef PGINPROF
	71	vmsizmon();
	72	#endif
	73	p = u.u_procp;
61d22ffc KM	74	MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage),
61d22ffc KM	75	M_ZOMBIE, M_WAITOK);
a8560fa0 SL	76	p->p_flag &= ~(STRC\|SULOCK);
a8560fa0 SL	77	p->p_flag \|= SWEXIT;
dd012d1e	78	p->p_sigignore = ~0;
a8560fa0 SL	79	p->p_cpticks = 0;
a8560fa0 SL	80	p->p_pctcpu = 0;
dd012d1e	81	for (i = 0; i < NSIG; i++)
a8560fa0 SL	82	u.u_signal[i] = SIG_IGN;
	83	untimeout(realitexpire, (caddr_t)p);
	84	/*
	85	* Release virtual memory. If we resulted from
	86	* a vfork(), instead give the resources back to
	87	* the parent.
	88	*/
	89	if ((p->p_flag & SVFORK) == 0)
	90	vrelvm();
	91	else {
	92	p->p_flag &= ~SVFORK;
	93	wakeup((caddr_t)p);
	94	while ((p->p_flag & SVFDONE) == 0)
	95	sleep((caddr_t)p, PZERO - 1);
	96	p->p_flag &= ~SVFDONE;
	97	}
48faa1e9	98	for (i = 0; i <= u.u_lastfile; i++) {
a8560fa0	99	struct file *f;
a8560fa0 SL	100
a8560fa0 SL	101	f = u.u_ofile[i];
48faa1e9 MK	102	if (f) {
	103	u.u_ofile[i] = NULL;
	104	u.u_pofile[i] = 0;
	105	closef(f);
	106	}
a8560fa0	107	}
1ad494e6 MK	108	if (SESS_LEADER(p)) {
	109	p->p_session->s_leader = 0;
	110	/* TODO: vhangup(); */
	111	if (u.u_ttyp) {
	112	u.u_ttyp->t_session = 0;
	113	u.u_ttyp->t_pgid = 0;
	114	}
	115	}
c4ec2128 KM	116	VOP_LOCK(u.u_cdir);
c4ec2128 KM	117	vput(u.u_cdir);
a8560fa0	118	if (u.u_rdir) {
c4ec2128 KM	119	VOP_LOCK(u.u_rdir);
c4ec2128 KM	120	vput(u.u_rdir);
a8560fa0 SL	121	}
	122	u.u_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
	123	acct();
	124	#ifdef QUOTA
	125	qclean();
1ad494e6	126	#endif
c4ec2128	127	crfree(u.u_cred);
1ad494e6 MK	128	#ifdef KTRACE
	129	/*
	130	* release trace file
	131	*/
	132	if (p->p_tracep)
c4ec2128	133	vrele(p->p_tracep);
a8560fa0	134	#endif
1ad494e6	135	/*
db8289b8 MK	136	/*
	137	* Freeing the user structure and kernel stack
	138	* for the current process: have to run a bit longer
	139	* using the pages which are about to be freed...
	140	* vrelu will block memory allocation by raising ipl.
	141	*/
a8560fa0	142	vrelu(u.u_procp, 0);
db8289b8	143	vrelpt(u.u_procp);
1d348849 MK	144	if (p->p_prev = p->p_nxt) / off allproc queue */
	145	p->p_nxt->p_prev = p->p_prev;
	146	if (p->p_nxt = zombproc) /* onto zombproc */
	147	p->p_nxt->p_prev = &p->p_nxt;
	148	p->p_prev = &zombproc;
	149	zombproc = p;
a8560fa0 SL	150	multprog--;
	151	p->p_stat = SZOMB;
	152	noproc = 1;
	153	i = PIDHASH(p->p_pid);
	154	x = p - proc;
	155	if (pidhash[i] == x)
	156	pidhash[i] = p->p_idhash;
	157	else {
	158	for (i = pidhash[i]; i != 0; i = proc[i].p_idhash)
	159	if (proc[i].p_idhash == x) {
	160	proc[i].p_idhash = p->p_idhash;
	161	goto done;
	162	}
	163	panic("exit");
	164	}
48faa1e9 MK	165	if (p->p_pid == 1) {
48faa1e9 MK	166	if (p->p_dsize == 0) {
1ad494e6	167	printf("Can't exec init (errno %d)\n", rv >> 8);
48faa1e9 MK	168	for (;;)
	169	;
	170	} else
	171	panic("init died");
	172	}
a8560fa0 SL	173	done:
a8560fa0 SL	174	p->p_xstat = rv;
48faa1e9 MK	175	*p->p_ru = u.u_ru;
48faa1e9 MK	176	ruadd(p->p_ru, &u.u_cru);
1d348849 MK	177	if (p->p_cptr) /* only need this if any child is S_ZOMB */
1d348849 MK	178	wakeup((caddr_t)&proc[1]);
1ad494e6 MK	179	if (PGRP_JOBC(p))
1ad494e6 MK	180	p->p_pgrp->pg_jobc--;
1d348849	181	for (q = p->p_cptr; q != NULL; q = nq) {
1ad494e6 MK	182	if (PGRP_JOBC(q))
1ad494e6 MK	183	q->p_pgrp->pg_jobc--;
1d348849 MK	184	nq = q->p_osptr;
	185	if (nq != NULL)
	186	nq->p_ysptr = NULL;
	187	if (proc[1].p_cptr)
	188	proc[1].p_cptr->p_ysptr = q;
	189	q->p_osptr = proc[1].p_cptr;
	190	q->p_ysptr = NULL;
	191	proc[1].p_cptr = q;
a8560fa0	192
1d348849 MK	193	q->p_pptr = &proc[1];
	194	q->p_ppid = 1;
	195	/*
	196	* Traced processes are killed
	197	* since their existence means someone is screwing up.
	198	* Stopped processes are sent a hangup and a continue.
	199	* This is designed to be ``safe'' for setuid
	200	* processes since they must be willing to tolerate
	201	* hangups anyways.
	202	*/
	203	if (q->p_flag&STRC) {
	204	q->p_flag &= ~STRC;
	205	psignal(q, SIGKILL);
	206	} else if (q->p_stat == SSTOP) {
	207	psignal(q, SIGHUP);
	208	psignal(q, SIGCONT);
a8560fa0	209	}
1d348849 MK	210	/*
	211	* Protect this process from future
	212	* tty signals, clear TSTP/TTIN/TTOU if pending.
	213	*/
f6ab5a0c	214	(void) spgrp(q);
1d348849	215	}
bdf8c113	216	p->p_cptr = NULL;
a8560fa0 SL	217	psignal(p->p_pptr, SIGCHLD);
a8560fa0 SL	218	wakeup((caddr_t)p->p_pptr);
fb1db32c MK	219	#if defined(tahoe)
	220	dkeyrelease(p->p_dkey), p->p_dkey = 0;
	221	ckeyrelease(p->p_ckey), p->p_ckey = 0;
	222	u.u_pcb.pcb_savacc.faddr = (float *)NULL;
	223	#endif
a8560fa0 SL	224	swtch();
	225	}
	226
1ad494e6 MK	227	#ifdef COMPAT_43
1ad494e6 MK	228	owait()
a8560fa0	229	{
1ad494e6 MK	230	struct a {
	231	int pid;
	232	union wait *status;
	233	int options;
	234	struct rusage *rusage;
	235	} uap = (struct a )u.u_ap;
a8560fa0 SL	236
a8560fa0 SL	237	if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) {
1ad494e6 MK	238	uap->options = WSIGRESTART;
	239	uap->rusage = 0;
	240	} else {
	241	uap->options = u.u_ar0[R0] \| WSIGRESTART;
	242	uap->rusage = (struct rusage *)u.u_ar0[R1];
a8560fa0	243	}
1ad494e6 MK	244	uap->pid = WAIT_ANY;
	245	uap->status = 0;
	246	wait1(1);
	247	}
	248
	249	wait4()
	250	{
	251	wait1(0);
a8560fa0	252	}
1ad494e6	253	#endif
a8560fa0	254
a8560fa0 SL	255	/*
	256	* Wait system call.
	257	* Search for a terminated (zombie) child,
	258	* finally lay it to rest, and collect its status.
	259	* Look also for stopped (traced) children,
	260	* and pass back status from them.
	261	*/
1ad494e6 MK	262	#ifdef COMPAT_43
	263	wait1(compat)
	264	int compat;
	265	#else
	266	wait4()
	267	#endif
a8560fa0	268	{
1ad494e6 MK	269	register struct a {
	270	int pid;
	271	union wait *status;
	272	int options;
	273	struct rusage *rusage;
	274	} uap = (struct a )u.u_ap;
a8560fa0 SL	275	register f;
a8560fa0 SL	276	register struct proc p, q;
1ad494e6	277	union wait status;
a8560fa0 SL	278
a8560fa0 SL	279	f = 0;
1d348849	280	q = u.u_procp;
1ad494e6 MK	281	if (uap->pid == 0)
	282	uap->pid = -q->p_pgid;
	283	if (uap->options &~ (WUNTRACED\|WNOHANG\|WSIGRESTART)) {
	284	u.u_error = EINVAL;
	285	return;
	286	}
	287	loop:
1d348849	288	for (p = q->p_cptr; p; p = p->p_osptr) {
1ad494e6 MK	289	if (uap->pid != WAIT_ANY &&
	290	p->p_pid != uap->pid && p->p_pgid != -uap->pid)
	291	continue;
a8560fa0 SL	292	f++;
a8560fa0 SL	293	if (p->p_stat == SZOMB) {
1ad494e6	294	pgrm(p); /* off pgrp */
a8560fa0	295	u.u_r.r_val1 = p->p_pid;
1ad494e6 MK	296	#ifdef COMPAT_43
	297	if (compat)
	298	u.u_r.r_val2 = p->p_xstat;
	299	else
	300	#endif
	301	if (uap->status) {
	302	status.w_status = p->p_xstat;
	303	if (u.u_error = copyout((caddr_t)&status,
	304	(caddr_t)uap->status, sizeof(status)))
	305	return;
5e63dd78	306	}
1ad494e6 MK	307	p->p_xstat = 0;
	308	if (uap->rusage)
	309	u.u_error = copyout((caddr_t)p->p_ru,
	310	(caddr_t)uap->rusage,
	311	sizeof (struct rusage));
	312	ruadd(&u.u_cru, p->p_ru);
	313	FREE(p->p_ru, M_ZOMBIE);
	314	p->p_ru = 0;
a8560fa0 SL	315	p->p_stat = NULL;
	316	p->p_pid = 0;
	317	p->p_ppid = 0;
1d348849 MK	318	if (p->p_prev = p->p_nxt) / off zombproc */
	319	p->p_nxt->p_prev = p->p_prev;
	320	p->p_nxt = freeproc; /* onto freeproc */
	321	freeproc = p;
a8560fa0 SL	322	if (q = p->p_ysptr)
	323	q->p_osptr = p->p_osptr;
	324	if (q = p->p_osptr)
	325	q->p_ysptr = p->p_ysptr;
	326	if ((q = p->p_pptr)->p_cptr == p)
	327	q->p_cptr = p->p_osptr;
	328	p->p_pptr = 0;
	329	p->p_ysptr = 0;
	330	p->p_osptr = 0;
	331	p->p_cptr = 0;
	332	p->p_sig = 0;
dd012d1e SL	333	p->p_sigcatch = 0;
	334	p->p_sigignore = 0;
	335	p->p_sigmask = 0;
1ad494e6	336	/p->p_pgrp = 0;/
a8560fa0 SL	337	p->p_flag = 0;
	338	p->p_wchan = 0;
	339	p->p_cursig = 0;
1ad494e6	340	return;
a8560fa0	341	}
1ad494e6 MK	342	if (p->p_stat == SSTOP && (p->p_flag & SWTED) == 0 &&
1ad494e6 MK	343	(p->p_flag & STRC \|\| uap->options & WUNTRACED)) {
a8560fa0 SL	344	p->p_flag \|= SWTED;
a8560fa0 SL	345	u.u_r.r_val1 = p->p_pid;
1ad494e6 MK	346	#ifdef COMPAT_43
	347	if (compat)
	348	u.u_r.r_val2 = (p->p_cursig<<8) \| WSTOPPED;
	349	else
	350	#endif
	351	if (uap->status) {
	352	status.w_status = 0;
	353	status.w_stopval = WSTOPPED;
	354	status.w_stopsig = p->p_cursig;
	355	u.u_error = copyout((caddr_t)&status,
	356	(caddr_t)uap->status, sizeof(status));
	357	}
	358	return;
a8560fa0 SL	359	}
a8560fa0 SL	360	}
1ad494e6 MK	361	if (f == 0) {
	362	u.u_error = ECHILD;
	363	return;
	364	}
	365	if (uap->options & WNOHANG) {
a8560fa0	366	u.u_r.r_val1 = 0;
1ad494e6	367	return;
a8560fa0	368	}
1ad494e6	369	if (uap->options & WSIGRESTART && setjmp(&u.u_qsave)) {
fe7f81f4	370	p = u.u_procp;
1ad494e6 MK	371	if ((u.u_sigintr & sigmask(p->p_cursig)) != 0) {
	372	u.u_error = EINTR;
	373	return;
	374	}
a8560fa0	375	u.u_eosys = RESTARTSYS;
1ad494e6	376	return;
a8560fa0 SL	377	}
	378	sleep((caddr_t)u.u_procp, PWAIT);
	379	goto loop;
	380	}