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diff --git a/ipc/mach_msg.h b/ipc/mach_msg.h
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+/*
+ * Mach Operating System
+ * Copyright (c) 1991,1990 Carnegie Mellon University
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ */
+/*
+ *	File:	ipc/mach_msg.h
+ *	Author:	Rich Draves
+ *	Date:	1989
+ *
+ *	Declarations of internal messaging primitives.
+ */
+
+#ifndef	_IPC_MACH_MSG_H_
+#define _IPC_MACH_MSG_H_
+
+#include <mach/boolean.h>
+#include <mach/message.h>
+
+extern mach_msg_return_t
+mach_msg_send(mach_msg_user_header_t *, mach_msg_option_t,
+	      mach_msg_size_t, mach_msg_timeout_t, mach_port_name_t);
+
+extern mach_msg_return_t
+mach_msg_receive(mach_msg_user_header_t *, mach_msg_option_t,
+		 mach_msg_size_t, mach_port_name_t,
+		 mach_msg_timeout_t, mach_port_name_t);
+
+extern void
+mach_msg_receive_continue(void);
+
+extern void
+mach_msg_continue(void);
+
+extern boolean_t
+mach_msg_interrupt(thread_t);
+
+#endif	/* _IPC_MACH_MSG_H_ */