Back it out, it breaks something in perl (seen with spamassassin), debug

first.

src/lib/libc/stdlib/atexit.c

@@ -1,43 +1,46 @@
-/*
- * Copyright (c) 2002 Daniel Hartmeier
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
  * All rights reserved.
  *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
  * 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.
  *
- *    - Redistributions of source code must retain the above copyright
- *      notice, this list of conditions and the following disclaimer.
- *    - 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.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
- * COPYRIGHT HOLDERS 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.
- *
+ * 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.
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char *rcsid = "$OpenBSD: atexit.c,v 1.3 2002/07/29 19:54:42 dhartmei Exp $";
+static char *rcsid = "$OpenBSD: atexit.c,v 1.4 2002/07/31 18:13:16 dhartmei Exp $";
 #endif /* LIBC_SCCS and not lint */
 
-#include <sys/types.h>
-#include <sys/mman.h>
 #include <stdlib.h>
 #include "atexit.h"
 
-int __atexit_invalid = 1;
 struct atexit *__atexit;
 
 /*
@@ -47,32 +50,18 @@ int
 atexit(fn)
 	void (*fn)();
 {
-	register struct atexit *p = __atexit;
-	register int pgsize = getpagesize();
+	static struct atexit __atexit0;	/* one guaranteed table */
+	register struct atexit *p;
 
-	if (pgsize < sizeof(*p))
-		return (-1);
-	if (p != NULL) {
-		if (p->ind + 1 >= p->max)
-			p = NULL;
-		else if (mprotect(p, pgsize, PROT_READ | PROT_WRITE))
-			return (-1);
-	}
-	if (p == NULL) {
-		p = mmap(NULL, pgsize, PROT_READ | PROT_WRITE,
-		    MAP_ANON | MAP_PRIVATE, -1, 0);
-		if (p == MAP_FAILED)
+	if ((p = __atexit) == NULL)
+		__atexit = p = &__atexit0;
+	else if (p->ind >= ATEXIT_SIZE) {
+		if ((p = malloc(sizeof(*p))) == NULL)
 			return (-1);
 		p->ind = 0;
-		p->max = (pgsize - ((char *)&p->fns[0] - (char *)p)) /
-		    sizeof(p->fns[0]);
 		p->next = __atexit;
 		__atexit = p;
-		if (__atexit_invalid)
-			__atexit_invalid = 0;
 	}
 	p->fns[p->ind++] = fn;
-	if (mprotect(p, pgsize, PROT_READ))
-		return (-1);
 	return (0);
 }

src/lib/libc/stdlib/atexit.h

@@ -1,41 +1,45 @@
-/*	$OpenBSD: atexit.h,v 1.3 2002/07/29 19:54:42 dhartmei Exp $ */
-
-/*
- * Copyright (c) 2002 Daniel Hartmeier
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
  * All rights reserved.
  *
  * 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.
  *
- *    - Redistributions of source code must retain the above copyright
- *      notice, this list of conditions and the following disclaimer.
- *    - 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.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
- * COPYRIGHT HOLDERS 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.
+ * 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.
  *
+ *	$OpenBSD: atexit.h,v 1.4 2002/07/31 18:13:16 dhartmei Exp $
  */
 
+/* must be at least 32 to guarantee ANSI conformance */
+#define	ATEXIT_SIZE	32
+
 struct atexit {
 	struct atexit *next;		/* next in list */
 	int ind;			/* next index in this table */
-	int max;			/* max entries >= ATEXIT_SIZE */
-	void (*fns[1])();		/* the table itself */
+	void (*fns[ATEXIT_SIZE])();	/* the table itself */
 };
 
-extern int __atexit_invalid;
 extern struct atexit *__atexit;		/* points to head of LIFO stack */

src/lib/libc/stdlib/exit.c

@@ -32,11 +32,9 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char *rcsid = "$OpenBSD: exit.c,v 1.5 2002/07/29 19:54:42 dhartmei Exp $";
+static char *rcsid = "$OpenBSD: exit.c,v 1.6 2002/07/31 18:13:16 dhartmei Exp $";
 #endif /* LIBC_SCCS and not lint */
 
-#include <sys/types.h>
-#include <sys/mman.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include "atexit.h"
@@ -60,19 +58,12 @@ void
 exit(status)
 	int status;
 {
-	register struct atexit *p, *q;
-	register int n, pgsize = getpagesize();
+	register struct atexit *p;
+	register int n;
 
-	if (!__atexit_invalid) {
-		p = __atexit;
-		while (p != NULL) {
-			for (n = p->ind; --n >= 0;)
-				(*p->fns[n])();
-			q = p;
-			p = p->next;
-			munmap(q, pgsize);
-		}
-	}
+	for (p = __atexit; p; p = p->next)
+		for (n = p->ind; --n >= 0;)
+			(*p->fns[n])();
 	if (__cleanup)
 		(*__cleanup)();
 	_exit(status);