projects / unix-history / blob
? search:
summary | tags | clone url | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
update for new VM
[unix-history] / usr / src / sys / kern / kern_exit.c
/*
* Copyright (c) 1982, 1986, 1989 Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*
* @(#)kern_exit.c 7.29 (Berkeley) %G%
*/
#include "param.h"
#include "systm.h"
#include "map.h"
#include "ioctl.h"
#include "tty.h"
#include "user.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 "machine/reg.h"
#ifdef COMPAT_43
#include "machine/psl.h"
#endif
#include "../vm/vm_param.h"
#include "../vm/vm_map.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 */
}
/*
* Release resources.
* Save u. area for parent to look at.
* Enter zombie state.
* Wake up parent and init processes,
* and dispose of children.
*/
exit(p, rv)
struct proc *p;
int rv;
{
register int i;
register struct proc *q, *nq;
register struct proc **pp;
#ifdef PGINPROF
vmsizmon();
#endif
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_sig = 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);
#ifdef SYSVSHM
if (p->p_shm)
shmexit(p);
#endif
vm_map_deallocate(p->p_map);
p->p_map = VM_MAP_NULL;
/*
* XXX preserve synchronization semantics of vfork
*/
if (p->p_flag & SVFORK) {
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;
(void) closef(f);
}
}
if (SESS_LEADER(p)) {
register struct session *sp = p->p_session;
if (sp->s_ttyvp) {
/*
* Controlling process.
* Signal foreground pgrp and revoke access
* to controlling terminal.
*/
if (sp->s_ttyp->t_pgrp)
pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1);
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 = 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;
(void) acct(p);
crfree(u.u_cred);
#ifdef KTRACE
/*
* release trace file
*/
if (p->p_tracep)
vrele(p->p_tracep);
#endif
splimp();
/* I don't think this will cause a sleep/realloc anywhere... */
kmem_free(kernel_map, (vm_offset_t)p->p_addr,
round_page(ctob(UPAGES)));
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;
p->p_stat = SZOMB;
noproc = 1;
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_pid == 1)
panic("init died");
p->p_xstat = rv;
*p->p_ru = u.u_ru;
i = splclock();
p->p_ru->ru_stime = p->p_stime;
p->p_ru->ru_utime = p->p_utime;
splx(i);
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]);
fixjobc(p, p->p_pgrp, 0);
for (q = p->p_cptr; q != NULL; q = nq) {
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.
*/
if (q->p_flag&STRC) {
q->p_flag &= ~STRC;
psignal(q, SIGKILL);
}
}
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(p, uap, retval)
struct proc *p;
register struct args {
int pid;
int *status;
int options;
struct rusage *rusage;
int compat;
} *uap;
int *retval;
{
if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) {
uap->options = 0;
uap->rusage = 0;
} else {
uap->options = u.u_ar0[R0];
uap->rusage = (struct rusage *)u.u_ar0[R1];
}
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 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(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 f;
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:
f = 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;
f++;
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);
pgrm(p); /* off pgrp */
p->p_xstat = 0;
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;
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 (f == 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;
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.