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diff --git a/mDNSResponder/mDNSShared/GenLinkedList.h b/mDNSResponder/mDNSShared/GenLinkedList.h
new file mode 100644
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+++ b/mDNSResponder/mDNSShared/GenLinkedList.h
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+/* -*- Mode: C; tab-width: 4 -*-
+ *
+ * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __GenLinkedList__
+#define __GenLinkedList__
+
+
+#include <stddef.h>
+
+
+struct  GenLinkedList
+{
+    void        *Head,
+    *Tail;
+    size_t LinkOffset;
+};
+typedef struct GenLinkedList GenLinkedList;
+
+
+void        InitLinkedList( GenLinkedList *pList, size_t linkOffset);
+
+void        AddToHead( GenLinkedList *pList, void *elem);
+void        AddToTail( GenLinkedList *pList, void *elem);
+
+int     RemoveFromList( GenLinkedList *pList, void *elem);
+
+int     ReplaceElem( GenLinkedList *pList, void *elemInList, void *newElem);
+
+
+
+struct  GenDoubleLinkedList
+{
+    void        *Head,
+    *Tail;
+    size_t FwdLinkOffset,
+           BackLinkOffset;
+};
+typedef struct GenDoubleLinkedList GenDoubleLinkedList;
+
+
+void        InitDoubleLinkedList( GenDoubleLinkedList *pList, size_t fwdLinkOffset,
+                                  size_t backLinkOffset);
+
+void        DLLAddToHead( GenDoubleLinkedList *pList, void *elem);
+
+void        DLLRemoveFromList( GenDoubleLinkedList *pList, void *elem);
+
+
+
+/* A GenLinkedOffsetList is like a GenLinkedList that stores the *Next field as a signed */
+/* offset from the address of the beginning of the element, rather than as a pointer. */
+
+struct  GenLinkedOffsetList
+{
+    size_t Head,
+           Tail;
+    size_t LinkOffset;
+};
+typedef struct GenLinkedOffsetList GenLinkedOffsetList;
+
+
+void        InitLinkedOffsetList( GenLinkedOffsetList *pList, size_t linkOffset);
+
+void        *GetHeadPtr( GenLinkedOffsetList *pList);
+void        *GetTailPtr( GenLinkedOffsetList *pList);
+void        *GetOffsetLink( GenLinkedOffsetList *pList, void *elem);
+
+void        OffsetAddToHead( GenLinkedOffsetList *pList, void *elem);
+void        OffsetAddToTail( GenLinkedOffsetList *pList, void *elem);
+
+int     OffsetRemoveFromList( GenLinkedOffsetList *pList, void *elem);
+
+int     OffsetReplaceElem( GenLinkedOffsetList *pList, void *elemInList, void *newElem);
+
+
+#endif //	__GenLinkedList__