[unix-history] / usr / src / sys.386bsd / kern / kern_exit.c

/*
 * Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)kern_exit.c	7.35 (Berkeley) 6/27/91
 */

#include "param.h"
#include "systm.h"
#include "ioctl.h"
#include "tty.h"
#include "time.h"
#include "resource.h"
#include "kernel.h"
#include "proc.h"
#include "buf.h"
#include "wait.h"
#include "file.h"
#include "vnode.h"
#include "syslog.h"
#include "malloc.h"
#include "resourcevar.h"

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

#include "vm/vm.h"
#include "vm/vm_kern.h"

/*
 * Exit system call: pass back caller's arg
 */
/* ARGSUSED */
rexit(p, uap, retval)
	struct proc *p;
	struct args {
		int	rval;
	} *uap;
	int *retval;
{

	exit(p, W_EXITCODE(uap->rval, 0));
	/* NOTREACHED */
}

/*
 * Exit: deallocate address space and other resources,
 * change proc state to zombie, and unlink proc from allproc
 * and parent's lists.  Save exit status and rusage for wait().
 * Check for child processes and orphan them.
 */
exit(p, rv)
	register struct proc *p;
	int rv;
{
	register struct proc *q, *nq;
	register struct proc **pp;
	int s;

#ifdef PGINPROF
	vmsizmon();
#endif
	MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage),
		M_ZOMBIE, M_WAITOK);
	/*
	 * If parent is waiting for us to exit or exec,
	 * SPPWAIT is set; we will wakeup the parent below.
	 */
	p->p_flag &= ~(STRC|SPPWAIT);
	p->p_flag |= SWEXIT;
	p->p_sigignore = ~0;
	p->p_sig = 0;
	untimeout(realitexpire, (caddr_t)p);

	/*
	 * Close open files and release open-file table.
	 * This may block!
	 */
	fdfree(p);

	/* The next two chunks should probably be moved to vmspace_exit. */
#ifdef SYSVSHM
	if (p->p_vmspace->vm_shm)
		shmexit(p);
#endif
	/*
	 * Release user portion of address space.
	 * This releases references to vnodes,
	 * which could cause I/O if the file has been unlinked.
	 * Need to do this early enough that we can still sleep.
	 * Can't free the entire vmspace as the kernel stack
	 * may be mapped within that space also.
	 */
	if (p->p_vmspace->vm_refcnt == 1)
		(void) vm_map_remove(&p->p_vmspace->vm_map, VM_MIN_ADDRESS,
		    VM_MAXUSER_ADDRESS);

	if (p->p_pid == 1)
		panic("init died");

	if (SESS_LEADER(p)) {
		register struct session *sp = p->p_session;

		if (sp->s_ttyvp) {
			/*
			 * Controlling process.
			 * Signal foreground pgrp,
			 * drain controlling terminal
			 * and revoke access to controlling terminal.
			 */
			if (sp->s_ttyp->t_session == sp) {
				if (sp->s_ttyp->t_pgrp)
					pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1);
				(void) ttywait(sp->s_ttyp);
				vgoneall(sp->s_ttyvp);
			}
			vrele(sp->s_ttyvp);
			sp->s_ttyvp = NULL;
			/*
			 * s_ttyp is not zero'd; we use this to indicate
			 * that the session once had a controlling terminal.
			 * (for logging and informational purposes)
			 */
		}
		sp->s_leader = NULL;
	}
	fixjobc(p, p->p_pgrp, 0);
	p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
#ifdef KTRACE
	/* 
	 * release trace file
	 */
	if (p->p_tracep)
		vrele(p->p_tracep);
#endif

	/* current process does not exist, as far as other parts of the
	 * system (clock) is concerned, since parts of it might not be
	 * there anymore */
	curproc = NULL;

	if (--p->p_limit->p_refcnt == 0) {
		FREE(p->p_limit, M_SUBPROC);
		p->p_limit = (struct plimit *) -1;
	}

	/*
	 * Remove proc from allproc queue and pidhash chain.
	 * Place onto zombproc.  Unlink from parent's child list.
	 */
	if (*p->p_prev = p->p_nxt)
		p->p_nxt->p_prev = p->p_prev;
	if (p->p_nxt = zombproc)
		p->p_nxt->p_prev = &p->p_nxt;
	p->p_prev = &zombproc;
	zombproc = p;
	p->p_stat = SZOMB;
	for (pp = &pidhash[PIDHASH(p->p_pid)]; *pp; pp = &(*pp)->p_hash)
		if (*pp == p) {
			*pp = p->p_hash;
			goto done;
		}
	panic("exit");
done:

	if (p->p_cptr)		/* only need this if any child is S_ZOMB */
		wakeup((caddr_t) initproc);
	for (q = p->p_cptr; q != NULL; q = nq) {
		nq = q->p_osptr;
		if (nq != NULL)
			nq->p_ysptr = NULL;
		if (initproc->p_cptr)
			initproc->p_cptr->p_ysptr = q;
		q->p_osptr = initproc->p_cptr;
		q->p_ysptr = NULL;
		initproc->p_cptr = q;

		q->p_pptr = initproc;
		/*
		 * Traced processes are killed
		 * since their existence means someone is screwing up.
		 */
		if (q->p_flag&STRC) {
			q->p_flag &= ~STRC;
			psignal(q, SIGKILL);
		}
	}
	p->p_cptr = NULL;

	/*
	 * Save exit status and final rusage info,
	 * adding in child rusage info and self times.
	 */
	p->p_xstat = rv;
	*p->p_ru = p->p_stats->p_ru;
	p->p_ru->ru_stime = p->p_stime;
	p->p_ru->ru_utime = p->p_utime;
	ruadd(p->p_ru, &p->p_stats->p_cru);

	/*
	 * Notify parent that we're gone.
	 */
	psignal(p->p_pptr, SIGCHLD);
	wakeup((caddr_t)p->p_pptr);
#if defined(tahoe)
	/* move this to cpu_exit */
	p->p_addr->u_pcb.pcb_savacc.faddr = (float *)NULL;
#endif
	/*
	 * Finally, call machine-dependent code to release the remaining
	 * resources including address space, the kernel stack and pcb.
	 * The address space is released by "vmspace_free(p->p_vmspace)";
	 * This is machine-dependent, as we may have to change stacks
	 * or ensure that the current one isn't reallocated before we
	 * finish.  cpu_exit will end with a call to swtch(), finishing
	 * our execution (pun intended).
	 */
	cpu_exit(p);
	/* NOTREACHED */
}

#ifdef COMPAT_43
owait(p, uap, retval)
	struct proc *p;
	register struct args {
		int	pid;
		int	*status;
		int	options;
		struct	rusage *rusage;
		int	compat;
	} *uap;
	int *retval;
{

	uap->options = 0;
	uap->rusage = 0;
	uap->pid = WAIT_ANY;
	uap->status = 0;
	uap->compat = 1;
	return (wait1(p, uap, retval));
}

wait4(p, uap, retval)
	struct proc *p;
	struct args {
		int	pid;
		int	*status;
		int	options;
		struct	rusage *rusage;
		int	compat;
	} *uap;
	int *retval;
{

	uap->compat = 0;
	return (wait1(p, uap, retval));
}
#else
#define	wait1	wait4
#endif

/*
 * Wait: check child processes to see if any have exited,
 * stopped under trace, or (optionally) stopped by a signal.
 * Pass back status and deallocate exited child's proc structure.
 */
wait1(q, uap, retval)
	register struct proc *q;
	register struct args {
		int	pid;
		int	*status;
		int	options;
		struct	rusage *rusage;
#ifdef COMPAT_43
		int compat;
#endif
	} *uap;
	int retval[];
{
	register int nfound;
	register struct proc *p;
	int status, error;

	if (uap->pid == 0)
		uap->pid = -q->p_pgid;
#ifdef notyet
	if (uap->options &~ (WUNTRACED|WNOHANG))
		return (EINVAL);
#endif
loop:
	nfound = 0;
	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;
		nfound++;
		if (p->p_stat == SZOMB) {
			retval[0] = p->p_pid;
#ifdef COMPAT_43
			if (uap->compat)
				retval[1] = p->p_xstat;
			else
#endif
			if (uap->status) {
				status = p->p_xstat;	/* convert to int */
				if (error = copyout((caddr_t)&status,
				    (caddr_t)uap->status, sizeof(status)))
					return (error);
			}
			if (uap->rusage && (error = copyout((caddr_t)p->p_ru,
			    (caddr_t)uap->rusage, sizeof (struct rusage))))
				return (error);
			p->p_xstat = 0;
			ruadd(&q->p_stats->p_cru, p->p_ru);
			FREE(p->p_ru, M_ZOMBIE);
			if (--p->p_cred->p_refcnt == 0) {
				crfree(p->p_cred->pc_ucred);
				FREE(p->p_cred, M_SUBPROC);
				p->p_cred = (struct pcred *) -1;
			}

			/*
			 * Finally finished with old proc entry.
			 * Unlink it from its process group and free it.
			 */
			leavepgrp(p);
			if (*p->p_prev = p->p_nxt)	/* off zombproc */
				p->p_nxt->p_prev = p->p_prev;
			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;

			/*
			 * Give machine-dependent layer a chance
			 * to free anything that cpu_exit couldn't
			 * release while still running in process context.
			 */
			cpu_wait(p);
			FREE(p, M_PROC);
			nprocs--;
			return (0);
		}
		if (p->p_stat == SSTOP && (p->p_flag & SWTED) == 0 &&
		    (p->p_flag & STRC || uap->options & WUNTRACED)) {
			p->p_flag |= SWTED;
			retval[0] = p->p_pid;
#ifdef COMPAT_43
			if (uap->compat) {
				retval[1] = W_STOPCODE(p->p_xstat);
				error = 0;
			} else
#endif
			if (uap->status) {
				status = W_STOPCODE(p->p_xstat);
				error = copyout((caddr_t)&status,
				    (caddr_t)uap->status, sizeof(status));
			} else
				error = 0;
			return (error);
		}
	}
	if (nfound == 0)
		return (ECHILD);
	if (uap->options & WNOHANG) {
		retval[0] = 0;
		return (0);
	}
	if (error = tsleep((caddr_t)q, PWAIT | PCATCH, "wait", 0))
		return (error);
	goto loop;
}
Commit	Line	Data
83a70f80 WJ	1	/*
	2	* Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*
	33	* @(#)kern_exit.c 7.35 (Berkeley) 6/27/91
	34	*/
	35
	36	#include "param.h"
	37	#include "systm.h"
	38	#include "ioctl.h"
	39	#include "tty.h"
	40	#include "time.h"
	41	#include "resource.h"
	42	#include "kernel.h"
	43	#include "proc.h"
	44	#include "buf.h"
	45	#include "wait.h"
	46	#include "file.h"
	47	#include "vnode.h"
	48	#include "syslog.h"
	49	#include "malloc.h"
	50	#include "resourcevar.h"
	51
	52	#include "machine/cpu.h"
	53	#ifdef COMPAT_43
	54	#include "machine/reg.h"
	55	#include "machine/psl.h"
	56	#endif
	57
	58	#include "vm/vm.h"
	59	#include "vm/vm_kern.h"
	60
	61	/*
	62	* Exit system call: pass back caller's arg
	63	*/
	64	/* ARGSUSED */
65	rexit(p, uap, retval)
66	struct proc *p;
67	struct args {
68	int rval;
69	} *uap;
70	int *retval;
71	{
72
73	exit(p, W_EXITCODE(uap->rval, 0));
74	/* NOTREACHED */
75	}
76
77	/*
78	* Exit: deallocate address space and other resources,
79	* change proc state to zombie, and unlink proc from allproc
80	* and parent's lists. Save exit status and rusage for wait().
81	* Check for child processes and orphan them.
82	*/
83	exit(p, rv)
84	register struct proc *p;
85	int rv;
86	{
87	register struct proc q, nq;
88	register struct proc **pp;
89	int s;
90
91	#ifdef PGINPROF
92	vmsizmon();
93	#endif
94	MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage),
95	M_ZOMBIE, M_WAITOK);
96	/*
97	* If parent is waiting for us to exit or exec,
98	* SPPWAIT is set; we will wakeup the parent below.
99	*/
100	p->p_flag &= ~(STRC\|SPPWAIT);
101	p->p_flag \|= SWEXIT;
102	p->p_sigignore = ~0;
103	p->p_sig = 0;
104	untimeout(realitexpire, (caddr_t)p);
105
106	/*
107	* Close open files and release open-file table.
108	* This may block!
109	*/
110	fdfree(p);
111
112	/* The next two chunks should probably be moved to vmspace_exit. */
113	#ifdef SYSVSHM
114	if (p->p_vmspace->vm_shm)
115	shmexit(p);
116	#endif
117	/*
118	* Release user portion of address space.
119	* This releases references to vnodes,
120	* which could cause I/O if the file has been unlinked.
121	* Need to do this early enough that we can still sleep.
122	* Can't free the entire vmspace as the kernel stack
123	* may be mapped within that space also.
124	*/
125	if (p->p_vmspace->vm_refcnt == 1)
126	(void) vm_map_remove(&p->p_vmspace->vm_map, VM_MIN_ADDRESS,
127	VM_MAXUSER_ADDRESS);
128
129	if (p->p_pid == 1)
130	panic("init died");
131
132	if (SESS_LEADER(p)) {
133	register struct session *sp = p->p_session;
134
135	if (sp->s_ttyvp) {
136	/*
137	* Controlling process.
138	* Signal foreground pgrp,
139	* drain controlling terminal
140	* and revoke access to controlling terminal.
141	*/
142	if (sp->s_ttyp->t_session == sp) {
143	if (sp->s_ttyp->t_pgrp)
144	pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1);
145	(void) ttywait(sp->s_ttyp);
146	vgoneall(sp->s_ttyvp);
147	}
148	vrele(sp->s_ttyvp);
149	sp->s_ttyvp = NULL;
150	/*
151	* s_ttyp is not zero'd; we use this to indicate
152	* that the session once had a controlling terminal.
153	* (for logging and informational purposes)
154	*/
155	}
156	sp->s_leader = NULL;
157	}
158	fixjobc(p, p->p_pgrp, 0);
159	p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
160	#ifdef KTRACE
161	/*
162	* release trace file
163	*/
164	if (p->p_tracep)
165	vrele(p->p_tracep);
166	#endif
167
168	/* current process does not exist, as far as other parts of the
169	* system (clock) is concerned, since parts of it might not be
170	* there anymore */
171	curproc = NULL;
172
173	if (--p->p_limit->p_refcnt == 0) {
174	FREE(p->p_limit, M_SUBPROC);
175	p->p_limit = (struct plimit *) -1;
176	}
177
178	/*
179	* Remove proc from allproc queue and pidhash chain.
180	* Place onto zombproc. Unlink from parent's child list.
181	*/
182	if (*p->p_prev = p->p_nxt)
183	p->p_nxt->p_prev = p->p_prev;
184	if (p->p_nxt = zombproc)
185	p->p_nxt->p_prev = &p->p_nxt;
186	p->p_prev = &zombproc;
187	zombproc = p;
188	p->p_stat = SZOMB;
189	for (pp = &pidhash[PIDHASH(p->p_pid)]; pp; pp = &(pp)->p_hash)
190	if (*pp == p) {
191	*pp = p->p_hash;
192	goto done;
193	}
194	panic("exit");
195	done:
196
197	if (p->p_cptr) /* only need this if any child is S_ZOMB */
198	wakeup((caddr_t) initproc);
199	for (q = p->p_cptr; q != NULL; q = nq) {
200	nq = q->p_osptr;
201	if (nq != NULL)
202	nq->p_ysptr = NULL;
203	if (initproc->p_cptr)
204	initproc->p_cptr->p_ysptr = q;
205	q->p_osptr = initproc->p_cptr;
206	q->p_ysptr = NULL;
207	initproc->p_cptr = q;
208
209	q->p_pptr = initproc;
210	/*
211	* Traced processes are killed
212	* since their existence means someone is screwing up.
213	*/
214	if (q->p_flag&STRC) {
215	q->p_flag &= ~STRC;
216	psignal(q, SIGKILL);
217	}
218	}
219	p->p_cptr = NULL;
220
221	/*
222	* Save exit status and final rusage info,
223	* adding in child rusage info and self times.
224	*/
225	p->p_xstat = rv;
226	*p->p_ru = p->p_stats->p_ru;
227	p->p_ru->ru_stime = p->p_stime;
228	p->p_ru->ru_utime = p->p_utime;
229	ruadd(p->p_ru, &p->p_stats->p_cru);
230
231	/*
232	* Notify parent that we're gone.
233	*/
234	psignal(p->p_pptr, SIGCHLD);
235	wakeup((caddr_t)p->p_pptr);
236	#if defined(tahoe)
237	/* move this to cpu_exit */
238	p->p_addr->u_pcb.pcb_savacc.faddr = (float *)NULL;
239	#endif
240	/*
241	* Finally, call machine-dependent code to release the remaining
242	* resources including address space, the kernel stack and pcb.
243	* The address space is released by "vmspace_free(p->p_vmspace)";
244	* This is machine-dependent, as we may have to change stacks
245	* or ensure that the current one isn't reallocated before we
246	* finish. cpu_exit will end with a call to swtch(), finishing
247	* our execution (pun intended).
248	*/
249	cpu_exit(p);
250	/* NOTREACHED */
251	}
252
253	#ifdef COMPAT_43
254	owait(p, uap, retval)
255	struct proc *p;
256	register struct args {
257	int pid;
258	int *status;
259	int options;
260	struct rusage *rusage;
261	int compat;
262	} *uap;
263	int *retval;
264	{
265
266	uap->options = 0;
267	uap->rusage = 0;
268	uap->pid = WAIT_ANY;
269	uap->status = 0;
270	uap->compat = 1;
271	return (wait1(p, uap, retval));
272	}
273
274	wait4(p, uap, retval)
275	struct proc *p;
276	struct args {
277	int pid;
278	int *status;
279	int options;
280	struct rusage *rusage;
281	int compat;
282	} *uap;
283	int *retval;
284	{
285
286	uap->compat = 0;
287	return (wait1(p, uap, retval));
288	}
289	#else
290	#define wait1 wait4
291	#endif
292
293	/*
294	* Wait: check child processes to see if any have exited,
295	* stopped under trace, or (optionally) stopped by a signal.
296	* Pass back status and deallocate exited child's proc structure.
297	*/
298	wait1(q, uap, retval)
299	register struct proc *q;
300	register struct args {
301	int pid;
302	int *status;
303	int options;
304	struct rusage *rusage;
305	#ifdef COMPAT_43
306	int compat;
307	#endif
308	} *uap;
309	int retval[];
310	{
311	register int nfound;
312	register struct proc *p;
313	int status, error;
314
315	if (uap->pid == 0)
316	uap->pid = -q->p_pgid;
317	#ifdef notyet
318	if (uap->options &~ (WUNTRACED\|WNOHANG))
319	return (EINVAL);
320	#endif
321	loop:
322	nfound = 0;
323	for (p = q->p_cptr; p; p = p->p_osptr) {
324	if (uap->pid != WAIT_ANY &&
325	p->p_pid != uap->pid && p->p_pgid != -uap->pid)
326	continue;
327	nfound++;
328	if (p->p_stat == SZOMB) {
329	retval[0] = p->p_pid;
330	#ifdef COMPAT_43
331	if (uap->compat)
332	retval[1] = p->p_xstat;
333	else
334	#endif
335	if (uap->status) {
336	status = p->p_xstat; /* convert to int */
337	if (error = copyout((caddr_t)&status,
338	(caddr_t)uap->status, sizeof(status)))
339	return (error);
340	}
341	if (uap->rusage && (error = copyout((caddr_t)p->p_ru,
342	(caddr_t)uap->rusage, sizeof (struct rusage))))
343	return (error);
344	p->p_xstat = 0;
345	ruadd(&q->p_stats->p_cru, p->p_ru);
346	FREE(p->p_ru, M_ZOMBIE);
347	if (--p->p_cred->p_refcnt == 0) {
348	crfree(p->p_cred->pc_ucred);
349	FREE(p->p_cred, M_SUBPROC);
350	p->p_cred = (struct pcred *) -1;
351	}
352
353	/*
354	* Finally finished with old proc entry.
355	* Unlink it from its process group and free it.
356	*/
357	leavepgrp(p);
358	if (p->p_prev = p->p_nxt) / off zombproc */
359	p->p_nxt->p_prev = p->p_prev;
360	if (q = p->p_ysptr)
361	q->p_osptr = p->p_osptr;
362	if (q = p->p_osptr)
363	q->p_ysptr = p->p_ysptr;
364	if ((q = p->p_pptr)->p_cptr == p)
365	q->p_cptr = p->p_osptr;
366
367	/*
368	* Give machine-dependent layer a chance
369	* to free anything that cpu_exit couldn't
370	* release while still running in process context.
371	*/
372	cpu_wait(p);
373	FREE(p, M_PROC);
374	nprocs--;
375	return (0);
376	}
377	if (p->p_stat == SSTOP && (p->p_flag & SWTED) == 0 &&
378	(p->p_flag & STRC \|\| uap->options & WUNTRACED)) {
379	p->p_flag \|= SWTED;
380	retval[0] = p->p_pid;
381	#ifdef COMPAT_43
382	if (uap->compat) {
383	retval[1] = W_STOPCODE(p->p_xstat);
384	error = 0;
385	} else
386	#endif
387	if (uap->status) {
388	status = W_STOPCODE(p->p_xstat);
389	error = copyout((caddr_t)&status,
390	(caddr_t)uap->status, sizeof(status));
391	} else
392	error = 0;
393	return (error);
394	}
395	}
396	if (nfound == 0)
397	return (ECHILD);
398	if (uap->options & WNOHANG) {
399	retval[0] = 0;
400	return (0);
401	}
402	if (error = tsleep((caddr_t)q, PWAIT \| PCATCH, "wait", 0))
403	return (error);
404	goto loop;
405	}