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diff --git a/include/mach_debug/pc_info.h b/include/mach_debug/pc_info.h
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+/* 
+ * 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:	mach_debug/pc_info.h
+ *	Author:	Brian Bershad
+ *	Date:	January 1992
+ *
+ *	Definitions for the PC sampling interface.
+ */
+
+#ifndef	_MACH_DEBUG_PC_INFO_H_
+#define _MACH_DEBUG_PC_INFO_H_
+
+
+typedef struct sampled_pc {
+    task_t 	task;
+    thread_t 	thread;
+    vm_offset_t pc;
+} sampled_pc_t;
+
+typedef sampled_pc_t *sampled_pc_array_t;
+typedef unsigned int sampled_pc_seqno_t;
+
+#endif	_MACH_DEBUG_PC_INFO_H_