-void acl_init(struct list_head *acl, char * const *acl_info, int num);
-int acl_lookup(int fd, struct list_head *acl);
-void acl_add_entry(struct list_head *acl, struct in_addr addr,
- int netmask);
-void acl_del_entry(struct list_head *acl, struct in_addr addr,
- int netmask);