--- /dev/null
+++ Libc/Libc-583/sys/open.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2005, 2009 Apple 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 <fcntl.h>
+#include <stdarg.h>
+
+int __open_nocancel(const char *path, int flags, mode_t mode);
+
+/*
+ * open stub: The legacy interface never automatically associated a controlling
+ * tty, so we always pass O_NOCTTY.
+ */
+int
+open(const char *path, int flags, ...)
+{
+	mode_t mode = 0;
+
+	if(flags & O_CREAT) {
+		va_list ap;
+		va_start(ap, flags);
+		// compiler warns to pass int (not mode_t) to va_arg
+		mode = va_arg(ap, int);
+		va_end(ap);
+	}
+	return(__open_nocancel(path, flags | O_NOCTTY, mode));
+}