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

/*	kern_exit.c	4.6	83/07/01	*/

#include "../machine/reg.h"
#include "../machine/psl.h"

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/map.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/kernel.h"
#include "../h/proc.h"
#include "../h/buf.h"
#include "../h/wait.h"
#include "../h/vm.h"
#include "../h/file.h"
#include "../h/mbuf.h"
#include "../h/inode.h"

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

	uap = (struct a *)u.u_ap;
	exit((uap->rval & 0377) << 8);
}

/*
 * 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;
{
	register int i;
	register struct proc *p, *q;
	register int x;
	struct mbuf *m = m_getclr(M_WAIT, MT_ZOMBIE);

#ifdef PGINPROF
	vmsizmon();
#endif
	p = u.u_procp;
	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 < NOFILE; i++) {
		struct file *f;

		f = u.u_ofile[i];
		u.u_ofile[i] = NULL;
		u.u_pofile[i] = 0;
		closef(f);
	}
	ilock(u.u_cdir);
	iput(u.u_cdir);
	if (u.u_rdir) {
		ilock(u.u_rdir);
		iput(u.u_rdir);
	}
	u.u_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
	acct();
#ifdef QUOTA
	qclean();
#endif
	vrelpt(u.u_procp);
	vrelu(u.u_procp, 0);
	(void) spl5();		/* hack for mem alloc race XXX */
	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)
		panic("init died");
done:
	p->p_xstat = rv;
if (m == 0)
panic("exit: m_getclr");
	p->p_ru = mtod(m, struct rusage *);
	*p->p_ru = u.u_ru;
	ruadd(p->p_ru, &u.u_cru);
	for (q = proc; q < procNPROC; q++)
		if (q->p_pptr == p) {
			if (q->p_osptr)
				q->p_osptr->p_ysptr = q->p_ysptr;
			if (q->p_ysptr)
				q->p_ysptr->p_osptr = q->p_osptr;
			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;
			wakeup((caddr_t)&proc[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, -1);
		}
	psignal(p->p_pptr, SIGCHLD);
	wakeup((caddr_t)p->p_pptr);
	swtch();
}

wait()
{
	struct rusage ru, *rup;

	if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) {
		u.u_error = wait1(0, (struct rusage *)0);
		return;
	}
	rup = (struct rusage *)u.u_ar0[R1];
	u.u_error = wait1(u.u_ar0[R0], &ru);
	if (u.u_error)
		return;
	(void) copyout((caddr_t)&ru, (caddr_t)rup, sizeof (struct rusage));
}

/*
 * 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.
 */
wait1(options, ru)
	register int options;
	struct rusage *ru;
{
	register f;
	register struct proc *p, *q;

	f = 0;
loop:
	for (p = proc; p < procNPROC; p++)
	if (p->p_pptr == u.u_procp) {
		f++;
		if (p->p_stat == SZOMB) {
			u.u_r.r_val1 = p->p_pid;
			u.u_r.r_val2 = p->p_xstat;
			p->p_xstat = 0;
			if (ru)
				*ru = *p->p_ru;
			ruadd(&u.u_cru, p->p_ru);
			(void) m_free(dtom(p->p_ru));
			p->p_ru = 0;
			p->p_stat = NULL;
			p->p_pid = 0;
			p->p_ppid = 0;
			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 (0);
		}
		if (p->p_stat == SSTOP && (p->p_flag&SWTED)==0 &&
		    (p->p_flag&STRC || options&WUNTRACED)) {
			p->p_flag |= SWTED;
			u.u_r.r_val1 = p->p_pid;
			u.u_r.r_val2 = (p->p_cursig<<8) | WSTOPPED;
			return (0);
		}
	}
	if (f == 0)
		return (ECHILD);
	if (options&WNOHANG) {
		u.u_r.r_val1 = 0;
		return (0);
	}
	if ((u.u_procp->p_flag&SOUSIG) == 0 && setjmp(&u.u_qsave)) {
		u.u_eosys = RESTARTSYS;
		return (0);
	}
	sleep((caddr_t)u.u_procp, PWAIT);
	goto loop;
}
Commit	Line	Data
e3d5bfde	1	/* kern_exit.c 4.6 83/07/01 */
a8560fa0 SL	2
	3	#include "../machine/reg.h"
	4	#include "../machine/psl.h"
	5
	6	#include "../h/param.h"
	7	#include "../h/systm.h"
	8	#include "../h/map.h"
	9	#include "../h/dir.h"
	10	#include "../h/user.h"
	11	#include "../h/kernel.h"
	12	#include "../h/proc.h"
	13	#include "../h/buf.h"
	14	#include "../h/wait.h"
	15	#include "../h/vm.h"
	16	#include "../h/file.h"
	17	#include "../h/mbuf.h"
	18	#include "../h/inode.h"
	19
	20	/*
	21	* Exit system call: pass back caller's arg
	22	*/
	23	rexit()
	24	{
	25	register struct a {
	26	int rval;
	27	} *uap;
	28
	29	uap = (struct a *)u.u_ap;
	30	exit((uap->rval & 0377) << 8);
	31	}
	32
	33	/*
	34	* Release resources.
	35	* Save u. area for parent to look at.
	36	* Enter zombie state.
	37	* Wake up parent and init processes,
	38	* and dispose of children.
	39	*/
	40	exit(rv)
	41	int rv;
	42	{
	43	register int i;
	44	register struct proc p, q;
	45	register int x;
	46	struct mbuf *m = m_getclr(M_WAIT, MT_ZOMBIE);
	47
	48	#ifdef PGINPROF
	49	vmsizmon();
	50	#endif
	51	p = u.u_procp;
	52	p->p_flag &= ~(STRC\|SULOCK);
	53	p->p_flag \|= SWEXIT;
dd012d1e	54	p->p_sigignore = ~0;
a8560fa0 SL	55	p->p_cpticks = 0;
a8560fa0 SL	56	p->p_pctcpu = 0;
dd012d1e	57	for (i = 0; i < NSIG; i++)
a8560fa0 SL	58	u.u_signal[i] = SIG_IGN;
	59	untimeout(realitexpire, (caddr_t)p);
	60	/*
	61	* Release virtual memory. If we resulted from
	62	* a vfork(), instead give the resources back to
	63	* the parent.
	64	*/
	65	if ((p->p_flag & SVFORK) == 0)
	66	vrelvm();
	67	else {
	68	p->p_flag &= ~SVFORK;
	69	wakeup((caddr_t)p);
	70	while ((p->p_flag & SVFDONE) == 0)
	71	sleep((caddr_t)p, PZERO - 1);
	72	p->p_flag &= ~SVFDONE;
	73	}
	74	for (i = 0; i < NOFILE; i++) {
	75	struct file *f;
a8560fa0 SL	76
	77	f = u.u_ofile[i];
	78	u.u_ofile[i] = NULL;
a8560fa0	79	u.u_pofile[i] = 0;
55dfda24	80	closef(f);
a8560fa0 SL	81	}
	82	ilock(u.u_cdir);
	83	iput(u.u_cdir);
	84	if (u.u_rdir) {
	85	ilock(u.u_rdir);
	86	iput(u.u_rdir);
	87	}
	88	u.u_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
	89	acct();
	90	#ifdef QUOTA
	91	qclean();
a8560fa0 SL	92	#endif
	93	vrelpt(u.u_procp);
	94	vrelu(u.u_procp, 0);
	95	(void) spl5(); /* hack for mem alloc race XXX */
	96	multprog--;
	97	p->p_stat = SZOMB;
	98	noproc = 1;
	99	i = PIDHASH(p->p_pid);
	100	x = p - proc;
	101	if (pidhash[i] == x)
	102	pidhash[i] = p->p_idhash;
	103	else {
	104	for (i = pidhash[i]; i != 0; i = proc[i].p_idhash)
	105	if (proc[i].p_idhash == x) {
	106	proc[i].p_idhash = p->p_idhash;
	107	goto done;
	108	}
	109	panic("exit");
	110	}
	111	if (p->p_pid == 1)
	112	panic("init died");
	113	done:
	114	p->p_xstat = rv;
	115	if (m == 0)
	116	panic("exit: m_getclr");
	117	p->p_ru = mtod(m, struct rusage *);
	118	*p->p_ru = u.u_ru;
	119	ruadd(p->p_ru, &u.u_cru);
	120	for (q = proc; q < procNPROC; q++)
	121	if (q->p_pptr == p) {
	122	if (q->p_osptr)
	123	q->p_osptr->p_ysptr = q->p_ysptr;
	124	if (q->p_ysptr)
	125	q->p_ysptr->p_osptr = q->p_osptr;
	126	if (proc[1].p_cptr)
	127	proc[1].p_cptr->p_ysptr = q;
	128	q->p_osptr = proc[1].p_cptr;
	129	q->p_ysptr = NULL;
	130	proc[1].p_cptr = q;
	131
	132	q->p_pptr = &proc[1];
	133	q->p_ppid = 1;
	134	wakeup((caddr_t)&proc[1]);
	135	/*
	136	* Traced processes are killed
	137	* since their existence means someone is screwing up.
	138	* Stopped processes are sent a hangup and a continue.
	139	* This is designed to be ``safe'' for setuid
	140	* processes since they must be willing to tolerate
	141	* hangups anyways.
	142	*/
	143	if (q->p_flag&STRC) {
	144	q->p_flag &= ~STRC;
	145	psignal(q, SIGKILL);
	146	} else if (q->p_stat == SSTOP) {
	147	psignal(q, SIGHUP);
	148	psignal(q, SIGCONT);
	149	}
	150	/*
	151	* Protect this process from future
	152	* tty signals, clear TSTP/TTIN/TTOU if pending.
	153	*/
	154	(void) spgrp(q, -1);
	155	}
156	psignal(p->p_pptr, SIGCHLD);
157	wakeup((caddr_t)p->p_pptr);
158	swtch();
159	}
160
161	wait()
162	{
163	struct rusage ru, *rup;
164
165	if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) {
166	u.u_error = wait1(0, (struct rusage *)0);
167	return;
168	}
169	rup = (struct rusage *)u.u_ar0[R1];
170	u.u_error = wait1(u.u_ar0[R0], &ru);
171	if (u.u_error)
172	return;
173	(void) copyout((caddr_t)&ru, (caddr_t)rup, sizeof (struct rusage));
174	}
175
a8560fa0 SL	176	/*
	177	* Wait system call.
	178	* Search for a terminated (zombie) child,
	179	* finally lay it to rest, and collect its status.
	180	* Look also for stopped (traced) children,
	181	* and pass back status from them.
	182	*/
	183	wait1(options, ru)
	184	register int options;
	185	struct rusage *ru;
	186	{
	187	register f;
	188	register struct proc p, q;
	189
	190	f = 0;
	191	loop:
	192	for (p = proc; p < procNPROC; p++)
	193	if (p->p_pptr == u.u_procp) {
	194	f++;
	195	if (p->p_stat == SZOMB) {
	196	u.u_r.r_val1 = p->p_pid;
	197	u.u_r.r_val2 = p->p_xstat;
	198	p->p_xstat = 0;
	199	if (ru)
	200	ru = p->p_ru;
	201	ruadd(&u.u_cru, p->p_ru);
	202	(void) m_free(dtom(p->p_ru));
	203	p->p_ru = 0;
	204	p->p_stat = NULL;
	205	p->p_pid = 0;
	206	p->p_ppid = 0;
	207	if (q = p->p_ysptr)
	208	q->p_osptr = p->p_osptr;
	209	if (q = p->p_osptr)
	210	q->p_ysptr = p->p_ysptr;
	211	if ((q = p->p_pptr)->p_cptr == p)
	212	q->p_cptr = p->p_osptr;
	213	p->p_pptr = 0;
	214	p->p_ysptr = 0;
	215	p->p_osptr = 0;
	216	p->p_cptr = 0;
	217	p->p_sig = 0;
dd012d1e SL	218	p->p_sigcatch = 0;
	219	p->p_sigignore = 0;
	220	p->p_sigmask = 0;
a8560fa0 SL	221	p->p_pgrp = 0;
	222	p->p_flag = 0;
	223	p->p_wchan = 0;
	224	p->p_cursig = 0;
	225	return (0);
	226	}
	227	if (p->p_stat == SSTOP && (p->p_flag&SWTED)==0 &&
	228	(p->p_flag&STRC \|\| options&WUNTRACED)) {
	229	p->p_flag \|= SWTED;
	230	u.u_r.r_val1 = p->p_pid;
	231	u.u_r.r_val2 = (p->p_cursig<<8) \| WSTOPPED;
	232	return (0);
	233	}
	234	}
dd012d1e	235	if (f == 0)
a8560fa0	236	return (ECHILD);
a8560fa0 SL	237	if (options&WNOHANG) {
	238	u.u_r.r_val1 = 0;
	239	return (0);
	240	}
dd012d1e	241	if ((u.u_procp->p_flag&SOUSIG) == 0 && setjmp(&u.u_qsave)) {
a8560fa0 SL	242	u.u_eosys = RESTARTSYS;
	243	return (0);
	244	}
	245	sleep((caddr_t)u.u_procp, PWAIT);
	246	goto loop;
	247	}