--- /dev/null
+++ Libc/Libc-825.26/threads/mig_support.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 1999 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@
+ */
+/* 
+ * Mach Operating System
+ * Copyright (c) 1989 Carnegie-Mellon University
+ * All rights reserved.  The CMU software License Agreement specifies
+ * the terms and conditions for use and redistribution.
+ */
+/*
+ * mig_support.c  - by Mary Thompson
+ *
+ * Routines to set and deallocate the mig reply port for the current thread.
+ * Called from mig-generated interfaces.
+ */
+#include <mach/mach.h>
+#include <pthread_internals.h>
+#include <pthread.h>
+
+#include "cthreads.h"
+#include "cthread_internals.h"
+
+pthread_lock_t reply_port_lock;
+extern mach_port_t _pthread_reply_port(pthread_t);
+static mach_port_t _task_reply_port = MACH_PORT_NULL;
+
+/*
+ * called in new child...
+ * clear lock to cover case where the parent had
+ * a thread holding this lock while another thread
+ * did the fork()
+ */
+void mig_fork_child()
+{
+	UNLOCK(reply_port_lock);
+}
+
+/*
+ * Called by mach_init with 0 before cthread_init is
+ * called and again with 1 at the end of cthread_init.
+ */
+void
+mig_init(init_done)
+	int init_done;
+{
+    if (init_done == 0) {
+        LOCK_INIT(reply_port_lock);
+        _task_reply_port = mach_reply_port();
+    }
+}
+
+/*
+ * Called by mig interface code whenever a reply port is needed.
+ * Tracing is masked during this call; otherwise, a call to printf()
+ * can result in a call to malloc() which eventually reenters
+ * mig_get_reply_port() and deadlocks.
+ */
+mach_port_t _mig_get_reply_port()
+{
+    pthread_t pself;
+
+    pself = pthread_self();
+    if ((pself != (pthread_t)NULL) && (pself->sig == _PTHREAD_SIG)) {
+        return pself->reply_port;
+    }
+    return MACH_PORT_NULL;
+}
+
+void _mig_set_reply_port(mach_port_t port)
+{
+    pthread_t pself;
+    pself = pthread_self();
+    
+    if ((pself != (pthread_t)NULL) && (pself->sig == _PTHREAD_SIG)) {
+        pself->reply_port = port;
+    }
+}