types(5)types(5)Nametypes - primitive system data typesSyntax
#include <sys/types.h>
Description
The data defined in the include file are used in UNIX system code.
Some data of these is accessible to user code:
#ifndef _TYPES_
#define _TYPES_
/* 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)))
typedef unsigned char u_char;
typedef unsigned short u_short;
typedef unsigned int u_int;
typedef unsigned long u_long;
typedef unsigned short ushort; /* sys III compat */
#ifdef vax
typedef struct _physadr { int r[1]; } *physadr;
typedef struct label_t {
int val[14];
} label_t;
#endif
typedef struct _quad { long val[2]; } quad;
typedef long daddr_t;
typedef char * caddr_t;
typedef u_long ino_t;
typedef long swblk_t;
typedef int size_t;
typedef int time_t;
typedef short dev_t;
typedef int off_t;
typedef struct fd_set { int fds_bits[1]; } fd_set;
#endif
The form daddr_t is used for disk addresses, except in an i-node on
disk. For further information, see Times are encoded in seconds since
00:00:00 GMT, January 1, 1970. The major and minor parts of a device
code specify kind and unit number of a device and are installation-
dependent. Offsets are measured in bytes from the beginning of a file.
The label_t variables are used to save the processor state while
another process is running.
See Alsoadb(1), lseek(2), time(3), fs(5)
VAX types(5)
