list_insert_head

	LIST_INSERT_HEAD(list_header.s.r, new_node.s.r)

	This macro inserts a node at the head of the list.

	list_header	(list_link_t *) pointer to list header
	new_node	(list_link_t *) pointer to node to be inserted

	This macro returns ACNET status values as follows:

	OK			success

	This function requires the following include files:

	cbslib_h

	Related functions:

	list_init, list_insert, LIST_INSERT_TAIL, list_delete,
	list_remove, list_find, list_for_each, LIST_IS_EMPTY, CAST_LLINK_TO