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diff --git a/include/mach/errorlib.h b/include/mach/errorlib.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 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 
+ * 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 the
+ * rights to redistribute these changes.
+ */
+/*
+ *	File:	errorlib.h
+ *	Author:	Douglas Orr, Carnegie Mellon University
+ *	Date:	Mar. 1988
+ *
+ *	Error bases for subsytems errors.
+ */
+
+#include <mach/error.h>
+
+#define KERN_DEVICE_MOD		(err_kern|err_sub(1))
+
+#define BOOTSTRAP_FS_MOD	(err_bootstrap|err_sub(0))
+
+#define	MACH_IPC_SEND_MOD	(err_mach_ipc|err_sub(0))
+#define	MACH_IPC_RCV_MOD	(err_mach_ipc|err_sub(1))
+#define	MACH_IPC_MIG_MOD	(err_mach_ipc|err_sub(2))
+
+#define	IPC_SEND_MOD		(err_ipc|err_sub(0))
+#define	IPC_RCV_MOD		(err_ipc|err_sub(1))
+#define	IPC_MIG_MOD		(err_ipc|err_sub(2))
+
+#define	SERV_NETNAME_MOD	(err_server|err_sub(0))
+#define	SERV_ENV_MOD		(err_server|err_sub(1))
+#define	SERV_EXECD_MOD		(err_server|err_sub(2))
+
+
+#define	NO_SUCH_ERROR		"unknown error code"
+
+struct error_subsystem {
+	char			* subsys_name;
+	int			max_code;
+	char			* * codes;
+};
+
+struct error_system {
+	int			max_sub;
+	char			* bad_sub;
+	struct error_subsystem	* subsystem;
+};
+
+extern	struct error_system 	errors[err_max_system+1];
+
+#define	errlib_count(s)		(sizeof(s)/sizeof(s[0]))