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diff --git a/c/src/libmisc/stackchk/internal.h b/c/src/libmisc/stackchk/internal.h
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+/* internal.h
+ *
+ * This include file contains internal information
+ * for the RTEMS stack checker.
+ *
+ * COPYRIGHT (c) 1989-1997.
+ * On-Line Applications Research Corporation (OAR).
+ * Copyright assigned to U.S. Government, 1994.
+ *
+ * The license and distribution terms for this file may in
+ * the file LICENSE in this distribution or at
+ * http://www.OARcorp.com/rtems/license.html.
+ *
+ * $Id$
+ */
+
+#ifndef __INTERNAL_STACK_CHECK_h
+#define __INTERNAL_STACK_CHECK_h
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * This structure is used to fill in and compare the "end of stack"
+ * marker pattern.
+ * pattern area must be a multiple of 4 words.
+ */
+
+#ifdef CPU_STACK_CHECK_SIZE
+#define PATTERN_SIZE_WORDS (((CPU_STACK_CHECK_SIZE / 4) + 3) & ~0x3)
+#else
+#define PATTERN_SIZE_WORDS 4
+#endif
+
+#define PATTERN_SIZE_BYTES (PATTERN_SIZE_WORDS * 4)
+
+typedef struct {
+ unsigned32 pattern[ PATTERN_SIZE_WORDS ];
+} Stack_check_Control;
+
+/*
+ * The pattern used to fill the entire stack.
+ */
+
+#define BYTE_PATTERN 0xA5
+#define U32_PATTERN 0xA5A5A5A5
+
+/*
+ * Stack_check_Create_extension
+ */
+
+boolean Stack_check_Create_extension(
+ Thread_Control *running,
+ Thread_Control *the_thread
+);
+
+/*
+ * Stack_check_Begin_extension
+ */
+
+void Stack_check_Begin_extension(
+ Thread_Control *the_thread
+);
+
+/*
+ * Stack_check_Switch_extension
+ */
+
+void Stack_check_Switch_extension(
+ Thread_Control *running,
+ Thread_Control *heir
+);
+
+/*
+ * Stack_check_Fatal_extension
+ */
+
+void Stack_check_Fatal_extension(
+ Internal_errors_Source source,
+ boolean is_internal,
+ unsigned32 status
+);
+
+/*
+ * Stack_check_Dump_usage
+ */
+
+void Stack_check_Dump_usage( void );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+/* end of include file */