initial import of NetBSD tree

1 files changed, 413 insertions, 0 deletions

diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
new file mode 100644
index 00000000000..4212de82b68
--- /dev/null
+++ b/sys/kern/kern_exit.c
@@ -0,0 +1,413 @@
+/*	$NetBSD: kern_exit.c,v 1.33 1995/10/07 06:28:13 mycroft Exp $	*/
+
+/*
+ * 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
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/map.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/proc.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/ptrace.h>
+#include <sys/acct.h>
+
+#include <sys/mount.h>
+#include <sys/syscallargs.h>
+
+#include <machine/cpu.h>
+
+#include <vm/vm.h>
+#include <vm/vm_kern.h>
+
+void cpu_exit __P((struct proc *));	/* XXX MOVE ME */
+void exit1 __P((struct proc *, int));
+
+/*
+ * exit --
+ *	Death of process.
+ */
+int
+sys_exit(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_exit_args /* {
+		syscallarg(int) rval;
+	} */ *uap = v;
+
+	exit1(p, W_EXITCODE(SCARG(uap, rval), 0));
+	/* NOTREACHED */
+	return (0);
+}
+
+/*
+ * 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;
+
+	if (p->p_pid == 1)
+		panic("init died (signal %d, exit %d)",
+		    WTERMSIG(rv), WEXITSTATUS(rv));
+#ifdef PGINPROF
+	vmsizmon();
+#endif
+	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);
+
+	/* The next three chunks should probably be moved to vmspace_exit. */
+	vm = p->p_vmspace;
+#ifdef SYSVSHM
+	if (vm->vm_shm)
+		shmexit(p);
+#endif
+#ifdef SYSVSEM
+	semexit(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 (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;
+		proc_reparent(q, 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);
+	/*
+	 * Notify procfs debugger
+	 */
+	if (p->p_flag & P_FSTRACE)
+		wakeup((caddr_t)p);
+#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);
+
+	/*
+	 * 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_swtch(), finishing
+	 * our execution (pun intended).
+	 */
+	cpu_exit(p);
+}
+
+int
+sys_wait4(q, v, retval)
+	register struct proc *q;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_wait4_args /* {
+		syscallarg(int) pid;
+		syscallarg(int *) status;
+		syscallarg(int) options;
+		syscallarg(struct rusage *) rusage;
+	} */ *uap = v;
+	register int nfound;
+	register struct proc *p, *t;
+	int status, error;
+
+#ifdef COMPAT_09
+	SCARG(uap, pid) = (short)SCARG(uap, pid);
+#endif
+
+	if (SCARG(uap, pid) == 0)
+		SCARG(uap, pid) = -q->p_pgid;
+#ifdef notyet
+	if (SCARG(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 (SCARG(uap, pid) != WAIT_ANY &&
+		    p->p_pid != SCARG(uap, pid) &&
+		    p->p_pgid != -SCARG(uap, pid))
+			continue;
+		nfound++;
+		if (p->p_stat == SZOMB) {
+			retval[0] = p->p_pid;
+
+			if (SCARG(uap, status)) {
+				status = p->p_xstat;	/* convert to int */
+				if (error = copyout((caddr_t)&status,
+				    (caddr_t)SCARG(uap, status),
+				    sizeof(status)))
+					return (error);
+			}
+			if (SCARG(uap, rusage) &&
+			    (error = copyout((caddr_t)p->p_ru,
+			    (caddr_t)SCARG(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);
+
+			/*
+			 * Decrement the count of procs running with this uid.
+			 */
+			(void)chgproccnt(p->p_cred->p_ruid, -1);
+
+			/*
+			 * Free up credentials.
+			 */
+			if (--p->p_cred->p_refcnt == 0) {
+				crfree(p->p_cred->pc_ucred);
+				FREE(p->p_cred, M_SUBPROC);
+			}
+
+			/*
+			 * Release reference to text vnode
+			 */
+			if (p->p_textvp)
+				vrele(p->p_textvp);
+
+			/*
+			 * 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 || SCARG(uap, options) & WUNTRACED)) {
+			p->p_flag |= P_WAITED;
+			retval[0] = p->p_pid;
+
+			if (SCARG(uap, status)) {
+				status = W_STOPCODE(p->p_xstat);
+				error = copyout((caddr_t)&status,
+				    (caddr_t)SCARG(uap, status),
+				    sizeof(status));
+			} else
+				error = 0;
+			return (error);
+		}
+	}
+	if (nfound == 0)
+		return (ECHILD);
+	if (SCARG(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;
+}