--- /dev/null
+++ Libc/Libc-262/sys/errno.c
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
+ * Reserved.  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 1.1 (the "License").  You may not use this file
+ * except in compliance with the License.  Please obtain a copy of the
+ * License at http://www.apple.com/publicsource 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 OR NON- INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved
+ */
+/*
+ * The world-renowned global variable
+ */
+#include <pthread_internals.h>
+
+#undef errno
+extern int errno;
+int *__error(void) {
+    pthread_t self = pthread_self();
+    /* If we're not a detached pthread, just return the global errno */
+    if ((self == (pthread_t)0) || (self->sig != _PTHREAD_SIG) || (self->detached & _PTHREAD_CREATE_PARENT)) {
+        return &errno;
+    }
+    return &self->err_no;
+}
+
+int cthread_errno(void) {
+        return *__error();
+}
+