int cifproxyarp(int, u_int32_t);
/* Delete proxy ARP entry for peer */
u_int32_t GetMask(u_int32_t); /* Get appropriate netmask for address */
+int mkdir_recursive(const char *); /* Recursively create directory */
int lock(char *); /* Create lock file for device */
int relock(int); /* Rewrite lock file with new pid */
void unlock(void); /* Delete previously-created lock file */