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diff --git a/include/mach/alert.h b/include/mach/alert.h
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+/*
+ * Copyright (c) 1993,1994 The University of Utah and
+ * the Computer Systems Laboratory (CSL).  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.
+ *
+ * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
+ * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
+ * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * CSL requests users of this software to return to csl-dist@cs.utah.edu any
+ * improvements that they make and grant CSL redistribution rights.
+ *
+ *      Author: Bryan Ford, University of Utah CSL
+ */
+/*
+ *	File:	mach/alert.h
+ *
+ *	Standard alert definitions
+ *
+ */
+
+#ifndef	_MACH_ALERT_H_
+#define _MACH_ALERT_H_
+
+#define ALERT_BITS		32		/* Minimum; more may actually be available */
+
+#define ALERT_ABORT_STRONG	0x00000001	/* Request to abort _all_ operations */
+#define ALERT_ABORT_SAFE	0x00000002	/* Request to abort restartable operations */
+
+#define ALERT_USER		0xffff0000	/* User-defined alert bits */
+
+#endif	_MACH_ALERT_H_