--- /dev/null
+++ Libc/Libc-1244.50.9/sys/fork.c
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2010 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <TargetConditionals.h>
+
+#include "libc_private.h"
+
+extern pid_t __fork(void);
+
+static void (*_libSystem_atfork_prepare)(void) = 0;
+static void (*_libSystem_atfork_parent)(void) = 0;
+static void (*_libSystem_atfork_child)(void) = 0;
+
+__private_extern__
+void _libc_fork_init(const struct _libc_functions *funcs)
+{
+	_libSystem_atfork_prepare = funcs->atfork_prepare;
+	_libSystem_atfork_parent = funcs->atfork_parent;
+	_libSystem_atfork_child = funcs->atfork_child;
+}
+
+/*
+ * fork stub
+ */
+pid_t
+fork(void)
+{
+	int ret;
+	
+	_libSystem_atfork_prepare();
+	// Reader beware: this __fork() call is yet another wrapper around the actual syscall
+	// and lives inside libsyscall. The fork syscall needs some cuddling by asm before it's
+	// allowed to see the big wide C world.
+	ret = __fork();
+	if (-1 == ret)
+	{
+		// __fork already set errno for us
+		_libSystem_atfork_parent();
+		return ret;
+	}
+	
+	if (0 == ret)
+	{
+		// We're the child in this part.
+		_libSystem_atfork_child();
+		return 0;
+	}
+	
+	_libSystem_atfork_parent();
+	return ret;
+}
+