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diff --git a/mach/error_compat.c b/mach/error_compat.c
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+++ b/mach/error_compat.c
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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 "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.
+ */
+
+/* This file was broken out from:
+ $Log$
+ Revision 1.1 1993/11/30 17:35:24 roland
+ entered into RCS
+
+ Revision 2.3 92/04/01 19:38:18 rpd
+ The static do_compat function is renamed to be globally accessible.
+ */
+
+#include <mach/error.h>
+#include <mach_error.h>
+#include <errorlib.h>
+
+
+void
+__mach_error_map_compat( org_err )
+ mach_error_t * org_err;
+{
+ mach_error_t err = *org_err;
+
+ /*
+ * map old error numbers to
+ * to new error sys & subsystem
+ */
+
+ if ((-200 < err) && (err <= -100))
+ err = -(err + 100) | IPC_SEND_MOD;
+ else if ((-300 < err) && (err <= -200))
+ err = -(err + 200) | IPC_RCV_MOD;
+ else if ((-400 < err) && (err <= -300))
+ err = -(err + 300) | MACH_IPC_MIG_MOD;
+ else if ((1000 <= err) && (err < 1100))
+ err = (err - 1000) | SERV_NETNAME_MOD;
+ else if ((1600 <= err) && (err < 1700))
+ err = (err - 1600) | SERV_ENV_MOD;
+ else if ((27600 <= err) && (err < 27700))
+ err = (err - 27600) | SERV_EXECD_MOD;
+ else if ((2500 <= err) && (err < 2600))
+ err = (err - 2500) | KERN_DEVICE_MOD;
+ else if ((5000 <= err) && (err < 5100))
+ err = (err - 5000) | BOOTSTRAP_FS_MOD;
+
+ *org_err = err;
+}