/*
- * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
+ * Copyright (c) 1982, 1986, 1989, 1991 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.
+ * %sccs.include.redist.c%
*
- * @(#)kern_exit.c 7.17 (Berkeley) %G%
+ * @(#)kern_exit.c 7.43 (Berkeley) %G%
*/
#include "param.h"
#include "systm.h"
#include "map.h"
-#include "user.h"
-#include "kernel.h"
+#include "ioctl.h"
#include "proc.h"
+#include "tty.h"
+#include "time.h"
+#include "resource.h"
+#include "kernel.h"
#include "buf.h"
#include "wait.h"
-#include "vm.h"
#include "file.h"
#include "vnode.h"
-#include "ioctl.h"
-#include "tty.h"
#include "syslog.h"
#include "malloc.h"
+#include "resourcevar.h"
-#include "machine/reg.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
*/
-rexit()
-{
- struct a {
+/* ARGSUSED */
+rexit(p, uap, retval)
+ struct proc *p;
+ struct args {
int rval;
} *uap;
+ int *retval;
+{
- uap = (struct a *)u.u_ap;
- exit(W_EXITCODE(uap->rval, 0));
+ 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: 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(rv)
+exit(p, rv)
+ register struct proc *p;
int rv;
{
- register int i;
- register struct proc *p, *q, *nq;
+ register struct proc *q, *nq;
register struct proc **pp;
+ register struct vmspace *vm;
+ int s;
#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);
+ /*
+ * 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;
- 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.
+ * Close open files and release open-file table.
+ * This may block!
*/
- 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;
+ fdfree(p);
- f = u.u_ofile[i];
- if (f) {
- u.u_ofile[i] = NULL;
- u.u_pofile[i] = 0;
- (void) closef(f);
- }
- }
+ /* The next two chunks should probably be moved to vmspace_exit. */
+ vm = p->p_vmspace;
+#ifdef SYSVSHM
+ if (vm->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 (vm->vm_refcnt == 1)
+ (void) vm_map_remove(&vm->vm_map, VM_MIN_ADDRESS,
+ VM_MAXUSER_ADDRESS);
+
+ if (p->p_pid == 1)
+ panic("init died");
if (SESS_LEADER(p)) {
- p->p_session->s_leader = 0;
- if (p->p_session->s_ttyvp) {
- vgoneall(p->p_session->s_ttyvp);
- vrele(p->p_session->s_ttyvp);
- p->p_session->s_ttyvp = NULL;
+ 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;
}
- 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);
+ fixjobc(p, p->p_pgrp, 0);
+ p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
+ (void) acct(p);
#ifdef KTRACE
/*
* release trace file
*/
+ p->p_traceflag = 0; /* don't trace the vrele() */
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.
+ * Remove proc from allproc queue and pidhash chain.
+ * Place onto zombproc. Unlink from parent's child list.
*/
- vrelu(u.u_procp, 0);
- vrelpt(u.u_procp);
- if (*p->p_prev = p->p_nxt) /* off allproc queue */
+ if (*p->p_prev = p->p_nxt)
p->p_nxt->p_prev = p->p_prev;
- if (p->p_nxt = zombproc) /* onto zombproc */
+ if (p->p_nxt = zombproc)
p->p_nxt->p_prev = &p->p_nxt;
p->p_prev = &zombproc;
zombproc = p;
- multprog--;
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;
}
panic("exit");
done:
- if (p->p_pid == 1) {
- if (p->p_dsize == 0) {
- printf("Can't exec init (errno %d)\n", WEXITSTATUS(rv));
- for (;;)
- ;
- } else
- 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]);
- if (PGRP_JOBC(p))
- p->p_pgrp->pg_jobc--;
+ wakeup((caddr_t) initproc);
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;
+ if (initproc->p_cptr)
+ initproc->p_cptr->p_ysptr = q;
+ q->p_osptr = initproc->p_cptr;
q->p_ysptr = NULL;
- proc[1].p_cptr = q;
+ initproc->p_cptr = q;
- q->p_pptr = &proc[1];
- q->p_ppid = 1;
+ q->p_pptr = initproc;
/*
* 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;
+
+ /*
+ * 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)
- dkeyrelease(p->p_dkey), p->p_dkey = 0;
- ckeyrelease(p->p_ckey), p->p_ckey = 0;
- u.u_pcb.pcb_savacc.faddr = (float *)NULL;
+ /* move this to cpu_exit */
+ p->p_addr->u_pcb.pcb_savacc.faddr = (float *)NULL;
#endif
- swtch();
+ /*
+ * Clear curproc after we've done all operations
+ * that could block, and before tearing down the rest
+ * of the process state that might be used from clock, etc.
+ * Also, can't clear curproc while we're still runnable,
+ * as we're not on a run queue (we are current, just not
+ * a proper proc any longer!).
+ *
+ * Other substructures are freed from wait().
+ */
+ curproc = NULL;
+ if (--p->p_limit->p_refcnt == 0)
+ FREE(p->p_limit, M_SUBPROC);
+
+ /*
+ * 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()
-{
- register struct a {
+owait(p, uap, retval)
+ struct proc *p;
+ register struct args {
int pid;
int *status;
int options;
struct rusage *rusage;
int compat;
- } *uap = (struct a *)u.u_ap;
+ } *uap;
+ int *retval;
+{
- if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) {
+#ifdef PSL_ALLCC
+ if ((p->p_md.md_regs[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->options = p->p_md.md_regs[R0];
+ uap->rusage = (struct rusage *)p->p_md.md_regs[R1];
}
+#else
+ uap->options = 0;
+ uap->rusage = 0;
+#endif
uap->pid = WAIT_ANY;
uap->status = 0;
uap->compat = 1;
- u.u_error = wait1();
+ return (wait1(p, uap, retval));
}
-wait4()
-{
- register struct a {
+wait4(p, uap, retval)
+ struct proc *p;
+ struct args {
int pid;
int *status;
int options;
struct rusage *rusage;
int compat;
- } *uap = (struct a *)u.u_ap;
+ } *uap;
+ int *retval;
+{
uap->compat = 0;
- u.u_error = wait1();
+ 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.
+ * 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()
-{
- register struct a {
+wait1(q, uap, retval)
+ register struct proc *q;
+ register struct args {
int pid;
int *status;
int options;
#ifdef COMPAT_43
int compat;
#endif
- } *uap = (struct a *)u.u_ap;
- register f;
- register struct proc *p, *q;
+ } *uap;
+ int retval[];
+{
+ register int nfound;
+ register struct proc *p;
int status, error;
- q = u.u_procp;
if (uap->pid == 0)
uap->pid = -q->p_pgid;
#ifdef notyet
return (EINVAL);
#endif
loop:
- f = 0;
+ 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;
- f++;
+ nfound++;
if (p->p_stat == SZOMB) {
- u.u_r.r_val1 = p->p_pid;
+ retval[0] = p->p_pid;
#ifdef COMPAT_43
if (uap->compat)
- u.u_r.r_val2 = p->p_xstat;
+ retval[1] = p->p_xstat;
else
#endif
if (uap->status) {
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);
+ ruadd(&q->p_stats->p_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_cred->p_refcnt == 0) {
+ crfree(p->p_cred->pc_ucred);
+ FREE(p->p_cred, M_SUBPROC);
+ }
+
+ /*
+ * 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;
- 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;
+
+ /*
+ * 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;
- u.u_r.r_val1 = p->p_pid;
+ retval[0] = p->p_pid;
#ifdef COMPAT_43
if (uap->compat) {
- u.u_r.r_val2 = W_STOPCODE(p->p_cursig);
+ retval[1] = W_STOPCODE(p->p_xstat);
error = 0;
} else
#endif
if (uap->status) {
- status = W_STOPCODE(p->p_cursig);
+ status = W_STOPCODE(p->p_xstat);
error = copyout((caddr_t)&status,
- (caddr_t)uap->status, sizeof(status));
+ (caddr_t)uap->status, sizeof(status));
} else
error = 0;
return (error);
}
}
- if (f == 0)
+ if (nfound == 0)
return (ECHILD);
if (uap->options & WNOHANG) {
- u.u_r.r_val1 = 0;
+ retval[0] = 0;
return (0);
}
- if (error = tsleep((caddr_t)u.u_procp, PWAIT | PCATCH, "wait", 0))
+ if (error = tsleep((caddr_t)q, PWAIT | PCATCH, "wait", 0))
return (error);
goto loop;
}