UNIX 7th Ed. - /usr/sys/h/types.h

   1: typedef long        daddr_t;    /* disk address */
   2: typedef char *      caddr_t;    /* core address */
   3: typedef unsigned int    ino_t;      /* i-node number */
   4: typedef long        time_t;     /* a time */
   5: typedef int         label_t[6];     /* program status */
   6: typedef int         dev_t;      /* device code */
   7: typedef long        off_t;      /* offset in file */
   8:     /* selectors and constructor for device code */
   9: #define major(x)    (int)(((unsigned)x>>8))
  10: #define minor(x)    (int)(x&0377)
  11: #define makedev(x,y)    (dev_t)((x)<<8|(y))

Defined macros

Usage of this include