557 lines
14 KiB
C
557 lines
14 KiB
C
/*-
|
|
* Copyright (c) 1982, 1986, 1989, 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
|
|
*
|
|
* 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 8.7 (Berkeley) 2/12/94
|
|
* $Id: kern_exit.c,v 1.38 1996/08/22 03:50:15 julian Exp $
|
|
*/
|
|
|
|
#include "opt_ktrace.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/tty.h>
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/file.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/ptrace.h>
|
|
#include <sys/acct.h> /* for acct_process() function prototype */
|
|
#include <sys/filedesc.h>
|
|
#include <sys/shm.h>
|
|
#include <sys/sem.h>
|
|
|
|
#ifdef COMPAT_43
|
|
#include <machine/reg.h>
|
|
#include <machine/psl.h>
|
|
#endif
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/vm_prot.h>
|
|
#include <vm/lock.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_map.h>
|
|
#include <vm/vm_kern.h>
|
|
|
|
static int wait1 __P((struct proc *, struct wait_args *, int [], int));
|
|
|
|
/*
|
|
* callout list for things to do at exit time
|
|
*/
|
|
typedef struct exit_list_element {
|
|
struct exit_list_element *next;
|
|
exitlist_fn function;
|
|
} *ele_p;
|
|
|
|
static ele_p exit_list;
|
|
|
|
/*
|
|
* exit --
|
|
* Death of process.
|
|
*/
|
|
void
|
|
exit(p, uap, retval)
|
|
struct proc *p;
|
|
struct rexit_args /* {
|
|
int rval;
|
|
} */ *uap;
|
|
int *retval;
|
|
{
|
|
|
|
exit1(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.
|
|
*/
|
|
void
|
|
exit1(p, rv)
|
|
register struct proc *p;
|
|
int rv;
|
|
{
|
|
register struct proc *q, *nq;
|
|
register struct vmspace *vm;
|
|
ele_p ep = exit_list;
|
|
|
|
if (p->p_pid == 1) {
|
|
printf("init died (signal %d, exit %d)\n",
|
|
WTERMSIG(rv), WEXITSTATUS(rv));
|
|
panic("Going nowhere without my init!");
|
|
}
|
|
#ifdef PGINPROF
|
|
vmsizmon();
|
|
#endif
|
|
/*
|
|
* Check if any LKMs need anything done at process exit.
|
|
* e.g. SYSV IPC stuff
|
|
* XXX what if one of these generates an error?
|
|
*/
|
|
while (ep) {
|
|
(*ep->function)(p);
|
|
ep = ep->next;
|
|
}
|
|
|
|
if (p->p_flag & P_PROFIL)
|
|
stopprofclock(p);
|
|
MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage),
|
|
M_ZOMBIE, M_WAITOK);
|
|
/*
|
|
* If parent is waiting for us to exit or exec,
|
|
* P_PPWAIT is set; we will wakeup the parent below.
|
|
*/
|
|
p->p_flag &= ~(P_TRACED | P_PPWAIT);
|
|
p->p_flag |= P_WEXIT;
|
|
p->p_sigignore = ~0;
|
|
p->p_siglist = 0;
|
|
untimeout(realitexpire, (caddr_t)p);
|
|
|
|
/*
|
|
* Close open files and release open-file table.
|
|
* This may block!
|
|
*/
|
|
fdfree(p);
|
|
|
|
/*
|
|
* Delete select() buffers
|
|
*/
|
|
if (p->p_selbits)
|
|
free (p->p_selbits, M_SELECT);
|
|
|
|
/*
|
|
* XXX Shutdown SYSV semaphores
|
|
*/
|
|
semexit(p);
|
|
|
|
/* The next two chunks should probably be moved to vmspace_exit. */
|
|
vm = p->p_vmspace;
|
|
if (vm->vm_shm)
|
|
shmexit(p);
|
|
/*
|
|
* 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 (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);
|
|
/*
|
|
* The tty could have been revoked
|
|
* if we blocked.
|
|
*/
|
|
if (sp->s_ttyvp)
|
|
vgoneall(sp->s_ttyvp);
|
|
}
|
|
if (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;
|
|
(void)acct_process(p);
|
|
#ifdef KTRACE
|
|
/*
|
|
* release trace file
|
|
*/
|
|
p->p_traceflag = 0; /* don't trace the vrele() */
|
|
if (p->p_tracep)
|
|
vrele(p->p_tracep);
|
|
#endif
|
|
/*
|
|
* Remove proc from allproc queue and pidhash chain.
|
|
* Place onto zombproc. Unlink from parent's child list.
|
|
*/
|
|
LIST_REMOVE(p, p_list);
|
|
LIST_INSERT_HEAD(&zombproc, p, p_list);
|
|
p->p_stat = SZOMB;
|
|
|
|
LIST_REMOVE(p, p_hash);
|
|
|
|
q = p->p_children.lh_first;
|
|
if (q) /* only need this if any child is S_ZOMB */
|
|
wakeup((caddr_t) initproc);
|
|
for (; q != 0; q = nq) {
|
|
nq = q->p_sibling.le_next;
|
|
LIST_REMOVE(q, p_sibling);
|
|
LIST_INSERT_HEAD(&initproc->p_children, q, p_sibling);
|
|
q->p_pptr = initproc;
|
|
/*
|
|
* Traced processes are killed
|
|
* since their existence means someone is screwing up.
|
|
*/
|
|
if (q->p_flag & P_TRACED) {
|
|
q->p_flag &= ~P_TRACED;
|
|
psignal(q, SIGKILL);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
calcru(p, &p->p_ru->ru_utime, &p->p_ru->ru_stime, NULL);
|
|
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
|
|
/*
|
|
* 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);
|
|
p->p_limit = NULL;
|
|
}
|
|
|
|
/*
|
|
* 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 cpu_switch(), finishing
|
|
* our execution (pun intended).
|
|
*/
|
|
cpu_exit(p);
|
|
}
|
|
|
|
#ifdef COMPAT_43
|
|
#if defined(hp300) || defined(luna68k)
|
|
#include <machine/frame.h>
|
|
#define GETPS(rp) ((struct frame *)(rp))->f_sr
|
|
#else
|
|
#define GETPS(rp) (rp)[PS]
|
|
#endif
|
|
|
|
int
|
|
owait(p, uap, retval)
|
|
struct proc *p;
|
|
register struct owait_args /* {
|
|
int dummy;
|
|
} */ *uap;
|
|
int *retval;
|
|
{
|
|
struct wait_args w;
|
|
|
|
#ifdef PSL_ALLCC
|
|
if ((GETPS(p->p_md.md_regs) & PSL_ALLCC) != PSL_ALLCC) {
|
|
w.options = 0;
|
|
w.rusage = NULL;
|
|
} else {
|
|
w.options = p->p_md.md_regs[R0];
|
|
w.rusage = (struct rusage *)p->p_md.md_regs[R1];
|
|
}
|
|
#else
|
|
w.options = 0;
|
|
w.rusage = NULL;
|
|
#endif
|
|
w.pid = WAIT_ANY;
|
|
w.status = NULL;
|
|
return (wait1(p, &w, retval, 1));
|
|
}
|
|
#endif /* COMPAT_43 */
|
|
|
|
int
|
|
wait4(p, uap, retval)
|
|
struct proc *p;
|
|
struct wait_args *uap;
|
|
int *retval;
|
|
{
|
|
|
|
return (wait1(p, uap, retval, 0));
|
|
}
|
|
|
|
static int
|
|
wait1(q, uap, retval, compat)
|
|
register struct proc *q;
|
|
register struct wait_args /* {
|
|
int pid;
|
|
int *status;
|
|
int options;
|
|
struct rusage *rusage;
|
|
} */ *uap;
|
|
int retval[];
|
|
int compat;
|
|
{
|
|
register int nfound;
|
|
register struct proc *p, *t;
|
|
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_children.lh_first; p != 0; p = p->p_sibling.le_next) {
|
|
if (uap->pid != WAIT_ANY &&
|
|
p->p_pid != uap->pid && p->p_pgid != -uap->pid)
|
|
continue;
|
|
nfound++;
|
|
if (p->p_stat == SZOMB) {
|
|
/* charge childs scheduling cpu usage to parent */
|
|
if (curproc->p_pid != 1) {
|
|
curproc->p_estcpu = min(curproc->p_estcpu +
|
|
p->p_estcpu, UCHAR_MAX);
|
|
}
|
|
|
|
retval[0] = p->p_pid;
|
|
#ifdef COMPAT_43
|
|
if (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);
|
|
/*
|
|
* If we got the child via a ptrace 'attach',
|
|
* we need to give it back to the old parent.
|
|
*/
|
|
if (p->p_oppid && (t = pfind(p->p_oppid))) {
|
|
p->p_oppid = 0;
|
|
proc_reparent(p, t);
|
|
psignal(t, SIGCHLD);
|
|
wakeup((caddr_t)t);
|
|
return (0);
|
|
}
|
|
p->p_xstat = 0;
|
|
ruadd(&q->p_stats->p_cru, p->p_ru);
|
|
FREE(p->p_ru, M_ZOMBIE);
|
|
p->p_ru = NULL;
|
|
|
|
/*
|
|
* Decrement the count of procs running with this uid.
|
|
*/
|
|
(void)chgproccnt(p->p_cred->p_ruid, -1);
|
|
|
|
/*
|
|
* Release reference to text vnode
|
|
*/
|
|
if (p->p_textvp)
|
|
vrele(p->p_textvp);
|
|
|
|
/*
|
|
* Free up credentials.
|
|
*/
|
|
if (--p->p_cred->p_refcnt == 0) {
|
|
crfree(p->p_cred->pc_ucred);
|
|
FREE(p->p_cred, M_SUBPROC);
|
|
p->p_cred = NULL;
|
|
}
|
|
|
|
/*
|
|
* Finally finished with old proc entry.
|
|
* Unlink it from its process group and free it.
|
|
*/
|
|
leavepgrp(p);
|
|
LIST_REMOVE(p, p_list); /* off zombproc */
|
|
LIST_REMOVE(p, p_sibling);
|
|
|
|
/*
|
|
* 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 & P_WAITED) == 0 &&
|
|
(p->p_flag & P_TRACED || uap->options & WUNTRACED)) {
|
|
p->p_flag |= P_WAITED;
|
|
retval[0] = p->p_pid;
|
|
#ifdef COMPAT_43
|
|
if (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;
|
|
}
|
|
|
|
/*
|
|
* make process 'parent' the new parent of process 'child'.
|
|
*/
|
|
void
|
|
proc_reparent(child, parent)
|
|
register struct proc *child;
|
|
register struct proc *parent;
|
|
{
|
|
|
|
if (child->p_pptr == parent)
|
|
return;
|
|
|
|
LIST_REMOVE(child, p_sibling);
|
|
LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);
|
|
child->p_pptr = parent;
|
|
}
|
|
|
|
/*
|
|
* The next two functions are to handle adding/deleting items on the
|
|
* exit callout list
|
|
*
|
|
* at_exit():
|
|
* Take the arguments given and put them onto the exit callout list,
|
|
* However first make sure that it's not already there.
|
|
* returns 0 on success.
|
|
*/
|
|
int
|
|
at_exit(exitlist_fn function)
|
|
{
|
|
ele_p ep;
|
|
|
|
/* Be noisy if the programmer has lost track of things */
|
|
if (rm_at_exit(function))
|
|
printf("exit callout entry already present\n");
|
|
ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT);
|
|
if (ep == NULL)
|
|
return (ENOMEM);
|
|
ep->next = exit_list;
|
|
ep->function = function;
|
|
exit_list = ep;
|
|
return (0);
|
|
}
|
|
/*
|
|
* Scan the exit callout list for the given items and remove them.
|
|
* Returns the number of items removed.
|
|
* Logically this can only be 0 or 1.
|
|
*/
|
|
int
|
|
rm_at_exit(exitlist_fn function)
|
|
{
|
|
ele_p *epp, ep;
|
|
int count;
|
|
|
|
count = 0;
|
|
epp = &exit_list;
|
|
ep = *epp;
|
|
while (ep) {
|
|
if (ep->function == function) {
|
|
*epp = ep->next;
|
|
free(ep, M_TEMP);
|
|
count++;
|
|
} else {
|
|
epp = &ep->next;
|
|
}
|
|
ep = *epp;
|
|
}
|
|
return (count);
|
|
}
|
|
|
|
|