diff --git a/libc/Android.mk b/libc/Android.mk
index aad6b04..ab09089 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -50,7 +50,6 @@
 	stdio/wbuf.c \
 	stdlib/atexit.c \
 	stdlib/ctype_.c \
-	stdlib/exit.c \
 	stdlib/getenv.c \
 	stdlib/putenv.c \
 	stdlib/setenv.c \
@@ -399,6 +398,7 @@
     upstream-netbsd/libc/stdlib/div.c \
     upstream-netbsd/libc/stdlib/drand48.c \
     upstream-netbsd/libc/stdlib/erand48.c \
+    upstream-netbsd/libc/stdlib/exit.c \
     upstream-netbsd/libc/stdlib/jrand48.c \
     upstream-netbsd/libc/stdlib/ldiv.c \
     upstream-netbsd/libc/stdlib/lldiv.c \
@@ -415,6 +415,7 @@
     upstream-netbsd/libc/string/strcasestr.c \
     upstream-netbsd/libc/string/strcoll.c \
     upstream-netbsd/libc/string/strxfrm.c \
+    upstream-netbsd/libc/thread-stub/__isthreaded.c \
     upstream-netbsd/libc/unistd/killpg.c \
 
 # Architecture specific source files go here
diff --git a/libc/stdlib/exit.c b/libc/upstream-netbsd/libc/stdlib/exit.c
similarity index 71%
rename from libc/stdlib/exit.c
rename to libc/upstream-netbsd/libc/stdlib/exit.c
index 923e42e..67e6adf 100644
--- a/libc/stdlib/exit.c
+++ b/libc/upstream-netbsd/libc/stdlib/exit.c
@@ -1,7 +1,8 @@
-/*	$OpenBSD: exit.c,v 1.12 2007/09/03 14:40:16 millert Exp $ */
+/*	$NetBSD: exit.c,v 1.15 2011/05/18 19:36:36 dsl Exp $	*/
+
 /*-
- * Copyright (c) 1990 The Regents of the University of California.
- * All rights reserved.
+ * Copyright (c) 1990, 1993
+ *	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
@@ -28,21 +29,23 @@
  * SUCH DAMAGE.
  */
 
-#include <sys/types.h>
-#include <sys/mman.h>
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)exit.c	8.1 (Berkeley) 6/4/93";
+#else
+__RCSID("$NetBSD: exit.c,v 1.15 2011/05/18 19:36:36 dsl Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
 #include <stdlib.h>
 #include <unistd.h>
+#ifdef _LIBC
+#include "reentrant.h"
 #include "atexit.h"
-#include "private/thread_private.h"
+#endif
 
-/*
- * This variable is zero until a process has created a thread.
- * It is used to avoid calling locking functions in libc when they
- * are not required. By default, libc is intended to be(come)
- * thread-safe, but without a (significant) penalty to non-threaded
- * processes.
- */
-int     __isthreaded    = 0;
+void (*__cleanup)(void);
 
 /*
  * Exit, flushing stdio buffers if necessary.
@@ -50,10 +53,11 @@
 void
 exit(int status)
 {
-	/*
-	 * Call functions registered by atexit() or _cxa_atexit()
-	 * (including the stdio cleanup routine) and then _exit().
-	 */
+
+#ifdef _LIBC
 	__cxa_finalize(NULL);
+#endif
+	if (__cleanup)
+		(*__cleanup)();
 	_exit(status);
 }
diff --git a/libc/upstream-netbsd/libc/thread-stub/__isthreaded.c b/libc/upstream-netbsd/libc/thread-stub/__isthreaded.c
new file mode 100644
index 0000000..50c1b6f
--- /dev/null
+++ b/libc/upstream-netbsd/libc/thread-stub/__isthreaded.c
@@ -0,0 +1,37 @@
+/*	$NetBSD: __isthreaded.c,v 1.3 2009/12/01 01:33:25 explorer Exp $	*/
+
+/*-
+ * Copyright (c) 1999 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Michael Graff.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: __isthreaded.c,v 1.3 2009/12/01 01:33:25 explorer Exp $");
+#endif /* LIBC_SCCS and not lint */
+
+int __isthreaded = 0;