typedef struct _physadr { int r[1]; } *physadr;
typedef long daddr_t;
typedef char * caddr_t;
typedef unsigned short ino_t;
typedef int swblk_t;
typedef int size_t;
typedef long time_t;
typedef int label_t[10];
typedef short dev_t;
typedef long off_t;
/* major part of a device */
#define major(x) (int)(((unsigned)x>>8)&0377)
/* minor part of a device */
#define minor(x) (int)(x&0377)
/* make a device number */
#define makedev(x,y) (dev_t)(((x)<<8) | (y))