36 typedef struct listNode {  struct
37     struct listNode *prev;  argument
38     struct listNode *next;  argument
40 } listNode;  typedef
43     listNode *next;
48     listNode *head;
49     listNode *tail;
77 list *listInsertNode(list *list, listNode *old_node, void *value, int after);
78 void listDelNode(list *list, listNode *node);
80 listNode *listNext(listIter *iter);
83 listNode *listSearchKey(list *list, void *key);
84 listNode *listIndex(list *list, long index);