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+#ifndef MERGESORT_H
+#define MERGESORT_H
+
+/*
+ * Sort linked list in place.
+ * - get_next_fn() returns the next element given an element of a linked list.
+ * - set_next_fn() takes two elements A and B, and makes B the "next" element
+ * of A on the list.
+ * - compare_fn() takes two elements A and B, and returns negative, 0, positive
+ * as the same sign as "subtracting" B from A.
+ */
+void *llist_mergesort(void *list,
+ void *(*get_next_fn)(const void *),
+ void (*set_next_fn)(void *, void *),
+ int (*compare_fn)(const void *, const void *));
+
+#endif