__dev_t
__dev_t fts_dev; /* starting device # */
__dev_t fts_dev; /* device */
char *devname(__dev_t, __mode_t);
char *devname_r(__dev_t, __mode_t, char *, int);
__dev_t ac_tty; /* controlling tty */
typedef __dev_t dev_t;
typedef __dev_t dev_t; /* device number or struct cdev */