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diff --git a/include/libuutil_impl.h b/include/libuutil_impl.h
new file mode 100644
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--- /dev/null
+++ b/include/libuutil_impl.h
@@ -0,0 +1,181 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (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 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_LIBUUTIL_IMPL_H
+#define	_LIBUUTIL_IMPL_H
+
+
+
+#include <libuutil.h>
+#include <pthread.h>
+
+#include <sys/avl_impl.h>
+#include <sys/byteorder.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+void uu_set_error(uint_t);
+
+
+/*PRINTFLIKE1*/
+void uu_panic(const char *format, ...);
+
+
+struct uu_dprintf {
+	char	*uud_name;
+	uu_dprintf_severity_t uud_severity;
+	uint_t	uud_flags;
+};
+
+/*
+ * For debugging purposes, libuutil keeps around linked lists of all uu_lists
+ * and uu_avls, along with pointers to their parents.  These can cause false
+ * negatives when looking for memory leaks, so we encode the pointers by
+ * storing them with swapped endianness;  this is not perfect, but it's about
+ * the best we can do without wasting a lot of space.
+ */
+#ifdef _LP64
+#define	UU_PTR_ENCODE(ptr)		BSWAP_64((uintptr_t)(void *)(ptr))
+#else
+#define	UU_PTR_ENCODE(ptr)		BSWAP_32((uintptr_t)(void *)(ptr))
+#endif
+
+#define	UU_PTR_DECODE(ptr)		((void *)UU_PTR_ENCODE(ptr))
+
+/*
+ * uu_list structures
+ */
+typedef struct uu_list_node_impl {
+	struct uu_list_node_impl *uln_next;
+	struct uu_list_node_impl *uln_prev;
+} uu_list_node_impl_t;
+
+struct uu_list_walk {
+	uu_list_walk_t	*ulw_next;
+	uu_list_walk_t	*ulw_prev;
+
+	uu_list_t	*ulw_list;
+	int8_t		ulw_dir;
+	uint8_t		ulw_robust;
+	uu_list_node_impl_t *ulw_next_result;
+};
+
+struct uu_list {
+	uintptr_t	ul_next_enc;
+	uintptr_t	ul_prev_enc;
+
+	uu_list_pool_t	*ul_pool;
+	uintptr_t	ul_parent_enc;	/* encoded parent pointer */
+	size_t		ul_offset;
+	size_t		ul_numnodes;
+	uint8_t		ul_debug;
+	uint8_t		ul_sorted;
+	uint8_t		ul_index;	/* mark for uu_list_index_ts */
+
+	uu_list_node_impl_t ul_null_node;
+	uu_list_walk_t	ul_null_walk;	/* for robust walkers */
+};
+
+#define	UU_LIST_PTR(ptr)		((uu_list_t *)UU_PTR_DECODE(ptr))
+
+#define	UU_LIST_POOL_MAXNAME	64
+
+struct uu_list_pool {
+	uu_list_pool_t	*ulp_next;
+	uu_list_pool_t	*ulp_prev;
+
+	char		ulp_name[UU_LIST_POOL_MAXNAME];
+	size_t		ulp_nodeoffset;
+	size_t		ulp_objsize;
+	uu_compare_fn_t	*ulp_cmp;
+	uint8_t		ulp_debug;
+	uint8_t		ulp_last_index;
+	pthread_mutex_t	ulp_lock;		/* protects null_list */
+	uu_list_t	ulp_null_list;
+};
+
+/*
+ * uu_avl structures
+ */
+typedef struct avl_node		uu_avl_node_impl_t;
+
+struct uu_avl_walk {
+	uu_avl_walk_t	*uaw_next;
+	uu_avl_walk_t	*uaw_prev;
+
+	uu_avl_t	*uaw_avl;
+	void		*uaw_next_result;
+	int8_t		uaw_dir;
+	uint8_t		uaw_robust;
+};
+
+struct uu_avl {
+	uintptr_t	ua_next_enc;
+	uintptr_t	ua_prev_enc;
+
+	uu_avl_pool_t	*ua_pool;
+	uintptr_t	ua_parent_enc;
+	uint8_t		ua_debug;
+	uint8_t		ua_index;	/* mark for uu_avl_index_ts */
+
+	struct avl_tree	ua_tree;
+	uu_avl_walk_t	ua_null_walk;
+};
+
+#define	UU_AVL_PTR(x)		((uu_avl_t *)UU_PTR_DECODE(x))
+
+#define	UU_AVL_POOL_MAXNAME	64
+
+struct uu_avl_pool {
+	uu_avl_pool_t	*uap_next;
+	uu_avl_pool_t	*uap_prev;
+
+	char		uap_name[UU_AVL_POOL_MAXNAME];
+	size_t		uap_nodeoffset;
+	size_t		uap_objsize;
+	uu_compare_fn_t	*uap_cmp;
+	uint8_t		uap_debug;
+	uint8_t		uap_last_index;
+	pthread_mutex_t	uap_lock;		/* protects null_avl */
+	uu_avl_t	uap_null_avl;
+};
+
+/*
+ * atfork() handlers
+ */
+void uu_avl_lockup(void);
+void uu_avl_release(void);
+
+void uu_list_lockup(void);
+void uu_list_release(void);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _LIBUUTIL_IMPL_H */