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diff --git a/libsysfs/sysfs/dlist.h b/libsysfs/sysfs/dlist.h
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+/*
+ * dlist.h
+ *
+ * Copyright (C) 2003 Eric J Bohm
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#ifndef _DLIST_H_
+#define _DLIST_H_
+
+/* Double linked list header.
+   
+* navigate your list with DLIST_PREV and DLIST_NEXT.  These are macros
+* so function call overhead is minimized.
+
+* Supports perl style push, pop, shift, unshift list semantics.
+
+* You allocate the data and give dlist the pointer.  If your data is
+* complex set the dlist->del_func to a an appropriate delete using
+* dlist_new_with_delete.  Your delete function must match 
+(void * )(del(void *)
+*Otherwise dlist will just use free.
+
+* NOTE: The small amount of pain involved in doing that allows us to
+* avoid copy in copy out semantics.
+
+* Dlist uses an internal mark pointer to keep track of where you are
+* in the list.
+
+* insert and delete take a directional parameter. Where direction
+* corresponds to the direction in which you want the list to go.
+* true direction corresponded to progressing forward in the last
+* false to regressing in the list.
+* so a dlist_insert(yourlist,item,1) will insert it after the mark
+* so a dlist_insert(yourlist,item,0) will insert it before the mark
+* any insert will move the mark to the new node regardless of the direction.
+
+* Just use the dlist_(insert|delete)_(before|after) macros if you do not want
+* to think about it.
+*/
+
+#include <stddef.h>
+
+typedef struct dl_node {
+  struct dl_node *prev;
+  struct dl_node *next;
+  void *data;
+} DL_node;
+
+typedef struct dlist {
+  DL_node *marker;
+  unsigned long count;
+  size_t data_size;
+  void (*del_func)(void *);
+  DL_node headnode;
+  DL_node *head;
+} Dlist;
+
+Dlist *dlist_new(size_t datasize);
+Dlist *dlist_new_with_delete(size_t datasize,void (*del_func)(void*));
+void *_dlist_mark_move(Dlist *list,int direction);
+void *dlist_mark(Dlist *);
+void dlist_start(Dlist *);
+void dlist_end(Dlist *);
+void dlist_move(struct dlist *source, struct dlist *dest, struct dl_node *target,int direction);
+void *dlist_insert(Dlist *,void *,int) ;
+
+void *dlist_insert_sorted(struct dlist *list, void *new_elem, int (*sorter)(void *, void *));
+
+void dlist_delete(Dlist *,int);
+
+void dlist_push(Dlist *,void *);
+
+void dlist_unshift(Dlist *,void *);
+void dlist_unshift_sorted(Dlist *,void *,int (*sorter)(void *, void *));
+
+void *dlist_pop(Dlist *);
+
+void *dlist_shift(Dlist *);
+
+void dlist_destroy(Dlist *);
+
+int _dlist_merge(struct dlist *listsource, struct dlist *listdest, unsigned int passcount, int (*compare)(void *, void *));
+
+void *dlist_find_custom(struct dlist *list, void *target, int (*comp)(void *, void *));
+
+void dlist_sort_custom(struct dlist *list, int (*compare)(void *, void *));
+
+
+void _dlist_swap(struct dlist *list, struct dl_node *a, struct dl_node *b);
+
+void dlist_transform(struct dlist *list, void (*node_operation)(void *));
+
+
+/* 
+ * _dlist_remove is for internal use only
+ * _dlist_mark_move is for internal use only
+ */
+void *_dlist_remove(struct dlist *,struct dl_node *,int );
+void *_dlist_insert_dlnode(struct dlist *list,struct dl_node *new_node,int direction);
+
+#define dlist_prev(A) _dlist_mark_move((A),0)
+#define dlist_next(A) _dlist_mark_move((A),1)
+
+#define dlist_insert_before(A,B) dlist_insert((A),(B),0)
+#define dlist_insert_after(A,B) dlist_insert((A),(B),1)
+
+#define dlist_delete_before(A) dlist_delete((A),0)
+#define dlist_delete_after(A) dlist_delete((A),1)
+
+/**
+ * provide for loop header which iterates the mark from start to end
+ * list: the dlist pointer, use dlist_mark(list) to get iterator
+ */
+#define dlist_for_each(list) \
+	for(dlist_start(list),dlist_next(list); \
+		(list)->marker!=(list)->head;dlist_next(list))
+
+/**
+ * provide for loop header which iterates the mark from end to start
+ * list: the dlist pointer, use dlist_mark(list) to get iterator
+ */
+#define dlist_for_each_rev(list) \
+	for(dlist_end(list),dlist_prev(list); \
+		(list)->marker!=(list)->head;dlist_prev(list))
+
+/**
+ * provide for loop header which iterates through the list without moving mark
+ * list: the dlist_pointer
+ * iterator: dl_node pointer to iterate
+ */
+#define dlist_for_each_nomark(list,iterator) \
+	for((iterator)=(list)->head->next; (iterator)!=(list)->head; \
+		(iterator)=(iterator)->next)
+
+/**
+ * provide for loop header which iterates through the list without moving mark
+ * in reverse
+ * list: the dlist_pointer
+ * iterator: dl_node pointer to iterate
+ */
+#define dlist_for_each_nomark_rev(list,iterator) \
+	for((iterator)=(list)->head->prev; (iterator)!=(list)->head; \
+		(iterator)=(iterator)->prev)
+/**
+ * provide for loop header which iterates through the list providing a
+ * data iterator
+ * list: the dlist pointer
+ * data_iterator: the pointer of type datatype to iterate
+ * datatype:  actual type of the contents in the dl_node->data
+ */
+
+#define dlist_for_each_data(list,data_iterator,datatype) \
+	for(dlist_start(list), (data_iterator)=(datatype *) dlist_next(list); \
+	(list)->marker!=(list)->head;(data_iterator)=(datatype *) dlist_next(list))
+
+/**
+ * provide for loop header which iterates through the list providing a
+ * data iterator in reverse
+ * list: the dlist pointer
+ * data_iterator: the pointer of type datatype to iterate
+ * datatype:  actual type of the contents in the dl_node->data
+ */
+#define dlist_for_each_data_rev(list,data_iterator,datatype) \
+	for(dlist_end(list), (data_iterator)=(datatype *) dlist_prev(list); \
+	(list)->marker!=(list)->head;(data_iterator)=(datatype *) dlist_prev(list))
+
+/**
+ * provide for loop header which iterates through the list providing a
+ * data iterator without moving the mark
+ * list: the dlist pointer
+ * iterator: the dl_node pointer to iterate
+ * data_iterator: the pointer of type datatype to iterate
+ * datatype:  actual type of the contents in the dl_node->data
+ */
+
+#define dlist_for_each_data_nomark(list,iterator,data_iterator,datatype) \
+	for((iterator)=(list)->head->next, (data_iterator)=(datatype *) (iterator)->data; \
+	(iterator)!=(list)->head;(iterator)=(iterator)->next,(data_iterator)=(datatype *) (iterator))
+
+/**
+ * provide for loop header which iterates through the list providing a
+ * data iterator in reverse without moving the mark
+ * list: the dlist pointer
+ * iterator: the dl_node pointer to iterate
+ * data_iterator: the pointer of type datatype to iterate
+ * datatype:  actual type of the contents in the dl_node->data
+ */
+#define dlist_for_each_data_nomark_rev(list,iterator, data_iterator,datatype) \
+	for((iterator)=(list)->head->prev, (data_iterator)=(datatype *) (iterator)->data; \
+	(iterator)!=(list)->head;(iterator)=(iterator)->prev,(data_iterator)=(datatype *) (iterator))
+
+#endif /* _DLIST_H_ */