1 files changed, 647 insertions, 0 deletions

diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
new file mode 100644
index 0000000..7be01af
--- /dev/null
+++ b/sys/kern/kern_exit.c
@@ -0,0 +1,647 @@
+/*
+ * 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 1.70 1998/12/19 02:55:33 julian Exp $
+ */
+
+#include "opt_compat.h"
+#include "opt_ktrace.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/sysproto.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/proc.h>
+#include <sys/pioctl.h>
+#include <sys/tty.h>
+#include <sys/wait.h>
+#include <sys/vnode.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>
+#include <sys/aio.h>
+
+#ifdef COMPAT_43
+#include <machine/reg.h>
+#include <machine/psl.h>
+#endif
+#include <machine/limits.h>	/* for UCHAR_MAX = typeof(p_priority)_MAX */
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <sys/lock.h>
+#include <vm/pmap.h>
+#include <vm/vm_map.h>
+#include <vm/vm_zone.h>
+#ifdef COMPAT_LINUX_THREADS
+#include <sys/user.h>
+#endif
+
+static MALLOC_DEFINE(M_ZOMBIE, "zombie", "zombie proc status");
+
+static int wait1 __P((struct proc *, struct wait_args *, 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)
+	struct proc *p;
+	struct rexit_args /* {
+		int	rval;
+	} */ *uap;
+{
+
+	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!");
+	}
+
+	aio_proc_rundown(p);
+
+	/* are we a task leader? */
+	if(p == p->p_leader) {
+        	struct kill_args killArgs;
+		killArgs.signum = SIGKILL;
+		q = p->p_peers;
+		while(q) {
+			killArgs.pid = q->p_pid;
+			/*
+		         * The interface for kill is better
+			 * than the internal signal
+			 */
+			kill(p, &killArgs);
+			nq = q;
+			q = q->p_peers;
+			/*
+			 * orphan the threads so we don't mess up
+			 * when they call exit
+			 */
+			nq->p_peers = 0;
+			nq->p_leader = nq;
+		}
+
+	/* otherwise are we a peer? */
+	} else if(p->p_peers) {
+		q = p->p_leader;
+		while(q->p_peers != p)
+			q = q->p_peers;
+		q->p_peers = p->p_peers;
+	}
+
+#ifdef PGINPROF
+	vmsizmon();
+#endif
+	STOPEVENT(p, S_EXIT, rv);
+
+	/* 
+	 * 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;
+#ifndef COMPAT_LINUX_THREADS
+	p->p_sigignore = ~0;
+#endif /* COMPAT_LINUX_THREADS */
+	p->p_siglist = 0;
+	if (timevalisset(&p->p_realtimer.it_value))
+		untimeout(realitexpire, (caddr_t)p, p->p_ithandle);
+
+	/*
+	 * Reset any sigio structures pointing to us as a result of
+	 * F_SETOWN with our pid.
+	 */
+	funsetownlst(&p->p_sigiolst);
+
+	/*
+	 * Close open files and release open-file table.
+	 * This may block!
+	 */
+	fdfree(p);
+
+	/*
+	 * XXX Shutdown SYSV semaphores
+	 */
+	semexit(p);
+
+	/* The next two chunks should probably be moved to vmspace_exit. */
+	vm = p->p_vmspace;
+	/*
+	 * 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) {
+		if (vm->vm_shm)
+			shmexit(p);
+		pmap_remove_pages(&vm->vm_pmap, VM_MIN_ADDRESS,
+		    VM_MAXUSER_ADDRESS);
+		(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 && (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)
+					VOP_REVOKE(sp->s_ttyvp, REVOKEALL);
+			}
+			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);
+	(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;
+#ifdef COMPAT_LINUX_THREADS
+		q->p_sigparent = 0;
+#endif /* COMPAT_LINUX_THREADS */
+		/*
+		 * 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.  If parent has the P_NOCLDWAIT
+	 * flag set, notify process 1 instead (and hope it will handle
+	 * this situation).
+	 */
+#ifndef COMPAT_LINUX_THREADS
+	if (p->p_pptr->p_flag & P_NOCLDWAIT) {
+#else
+	if (p->p_pptr->p_procsig->ps_flag & P_NOCLDWAIT) {
+#endif /* COMPAT_LINUX_THREADS */
+		struct proc *pp = p->p_pptr;
+		proc_reparent(p, initproc);
+		/*
+		 * If this was the last child of our parent, notify
+		 * parent, so in case he was wait(2)ing, he will
+		 * continue.
+		 */
+		if (LIST_EMPTY(&pp->p_children))
+			wakeup((caddr_t)pp);
+	}
+
+#ifndef COMPAT_LINUX_THREADS
+	psignal(p->p_pptr, SIGCHLD);
+#else
+	if (p->p_sigparent && p->p_pptr != initproc) {
+	        psignal(p->p_pptr, p->p_sigparent);
+	} else {
+	        psignal(p->p_pptr, SIGCHLD);
+	}
+#endif /* COMPAT_LINUX_THREADS */
+	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)
+	struct proc *p;
+	register struct owait_args /* {
+		int     dummy;
+	} */ *uap;
+{
+	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, 1));
+}
+#endif /* COMPAT_43 */
+
+int
+wait4(p, uap)
+	struct proc *p;
+	struct wait_args *uap;
+{
+
+	return (wait1(p, uap, 0));
+}
+
+static int
+wait1(q, uap, compat)
+	register struct proc *q;
+	register struct wait_args /* {
+		int pid;
+		int *status;
+		int options;
+		struct rusage *rusage;
+	} */ *uap;
+	int compat;
+{
+	register int nfound;
+	register struct proc *p, *t;
+	int status, error;
+
+	if (uap->pid == 0)
+		uap->pid = -q->p_pgid;
+	if (uap->options &~ (WUNTRACED|WNOHANG))
+		return (EINVAL);
+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);
+			}
+
+			q->p_retval[0] = p->p_pid;
+#ifdef COMPAT_43
+			if (compat)
+				q->p_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);
+
+#ifdef COMPAT_LINUX_THREADS
+			if (--p->p_procsig->ps_refcnt == 0) {
+				if (p->p_sigacts != &p->p_addr->u_sigacts)
+					FREE(p->p_sigacts, M_SUBPROC);
+			        FREE(p->p_procsig, M_SUBPROC);
+				p->p_procsig = NULL;
+			}
+#endif /* COMPAT_LINUX_THREADS */
+			/*
+			 * Give machine-dependent layer a chance
+			 * to free anything that cpu_exit couldn't
+			 * release while still running in process context.
+			 */
+			cpu_wait(p);
+			zfree(proc_zone, p);
+			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;
+			q->p_retval[0] = p->p_pid;
+#ifdef COMPAT_43
+			if (compat) {
+				q->p_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) {
+		q->p_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(function)
+	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(function)
+	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);
+}
+
+#ifdef COMPAT_LINUX_THREADS
+void check_sigacts (void)
+{
+	struct proc *p = curproc;
+	struct sigacts *pss;
+	int s;
+
+	if (p->p_procsig->ps_refcnt == 1 &&
+	    p->p_sigacts != &p->p_addr->u_sigacts) {
+		pss = p->p_sigacts;
+		s = splhigh();
+		p->p_addr->u_sigacts = *pss;
+		p->p_sigacts = &p->p_addr->u_sigacts;
+		splx(s);
+		FREE(pss, M_SUBPROC);
+	}
+}
+#endif