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diff --git a/head/stdio_ext.h b/head/stdio_ext.h
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+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/*
+ * Extensions to the stdio package
+ */
+
+#ifndef _STDIO_EXT_H
+#define	_STDIO_EXT_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <stdio.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/*
+ * Even though the contents of the stdio FILE structure have always been
+ * private to the stdio implementation, over the years some programs have
+ * needed to get information about a stdio stream that was not accessible
+ * through a supported interface. These programs have resorted to accessing
+ * fields of the FILE structure directly, rendering them possibly non-portable
+ * to new implementations of stdio, or more likely, preventing enhancements
+ * to stdio because those programs will break.
+ *
+ * In the 64-bit world, the FILE structure is opaque. The routines here
+ * are provided as a way to get the information that used to be retrieved
+ * directly from the FILE structure. They are based on the needs of
+ * existing programs (such as 'mh' and 'emacs'), so they may be extended
+ * as other programs are ported. Though they may still be non-portable to
+ * other operating systems, they will work from each Solaris release to
+ * the next. More portable interfaces are being developed.
+ */
+
+#define	FSETLOCKING_QUERY	0
+#define	FSETLOCKING_INTERNAL	1
+#define	FSETLOCKING_BYCALLER	2
+
+extern size_t __fbufsize(FILE *stream);
+extern int __freading(FILE *stream);
+extern int __fwriting(FILE *stream);
+extern int __freadable(FILE *stream);
+extern int __fwritable(FILE *stream);
+extern int __flbf(FILE *stream);
+extern void __fpurge(FILE *stream);
+extern size_t __fpending(FILE *stream);
+extern void _flushlbf(void);
+extern int __fsetlocking(FILE *stream, int type);
+
+/*
+ * Extended FILE enabling function.
+ */
+#if defined(_LP64) && !defined(__lint)
+#define	enable_extended_FILE_stdio(fd, act)		(0)
+#else
+extern int enable_extended_FILE_stdio(int, int);
+#endif
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _STDIO_EXT_H */