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TYPES(5)                    BSD File Formats Manual                   TYPES(5)

     types -- system data types

     #include <&lt;sys/types.h>&gt;

     The file <sys/types.h> contains the defined data types used in the kernel
     (most are used throughout the system).

     #ifndef _SYS_TYPES_H_
     #define _SYS_TYPES_H_

     /* Machine type dependent parameters. */
     #include <machine/types.h>

     #include <machine/ansi.h>
     #include <machine/endian.h>

     #if !defined(_POSIX_SOURCE) && !defined(_XOPEN_SOURCE)
     typedef unsigned char   u_char;
     typedef unsigned short  u_short;
     typedef unsigned int    u_int;
     typedef unsigned long   u_long;

     typedef unsigned char   unchar;         /* Sys V compatibility */
     typedef unsigned short  ushort;         /* Sys V compatibility */
     typedef unsigned int    uint;           /* Sys V compatibility */
     typedef unsigned long   ulong;          /* Sys V compatibility */

     typedef u_int64_t       u_quad_t;       /* quads */
     typedef int64_t         quad_t;
     typedef quad_t *        qaddr_t;

     typedef char *          caddr_t;        /* core address */
     typedef int32_t         daddr_t;        /* disk address */
     typedef int32_t         dev_t;          /* device number */
     typedef u_int32_t       fixpt_t;        /* fixed point number */
     typedef u_int32_t       gid_t;          /* group id */
     typedef u_int32_t       ino_t;          /* inode number */
     typedef long            key_t;          /* IPC key (for Sys V IPC) */
     typedef u_int16_t       mode_t;         /* permissions */
     typedef u_int16_t       nlink_t;        /* link count */
     typedef quad_t          off_t;          /* file offset */
     typedef int32_t         pid_t;          /* process id */
     typedef quad_t          rlim_t;         /* resource limit */
     typedef int32_t         segsz_t;        /* segment size */
     typedef int32_t         swblk_t;        /* swap offset */
     typedef u_int32_t       uid_t;          /* user id */

     #if !defined(_POSIX_SOURCE) && !defined(_XOPEN_SOURCE)
     /* Major, minor numbers, dev_t's. */
     #define major(x)        ((int32_t)(((u_int32_t)(x) >> 8) & 0xff))
     #define minor(x)        ((int32_t)((x) & 0xff))
     #define makedev(x,y)    ((dev_t)(((x) << 8) | (y)))

     #ifdef  _BSD_CLOCK_T_
     typedef _BSD_CLOCK_T_   clock_t;
     #undef  _BSD_CLOCK_T_

     #ifdef  _BSD_SIZE_T_
     typedef _BSD_SIZE_T_    size_t;
     #undef  _BSD_SIZE_T_

     #ifdef  _BSD_SSIZE_T_
     typedef _BSD_SSIZE_T_   ssize_t;
     #undef  _BSD_SSIZE_T_

     #ifdef  _BSD_TIME_T_
     typedef _BSD_TIME_T_    time_t;
     #undef  _BSD_TIME_T_

     #ifdef  _BSD_CLOCKID_T_
     typedef _BSD_CLOCKID_T_ clockid_t;
     #undef  _BSD_CLOCKID_T_

     #ifdef  _BSD_TIMER_T_
     typedef _BSD_TIMER_T_   timer_t;
     #undef  _BSD_TIMER_T_

     #if !defined(_POSIX_SOURCE) && !defined(_XOPEN_SOURCE)
     #define NBBY    8               /* number of bits in a byte */

      * Select uses bit masks of file descriptors in longs.  These macros
      * manipulate such bit fields (the filesystem macros use chars).
      * FD_SETSIZE may be defined by the user, but the default here should
      * be enough for most uses.
     #ifndef FD_SETSIZE
     #define FD_SETSIZE      256

     typedef int32_t fd_mask;
     #define NFDBITS (sizeof(fd_mask) * NBBY)        /* bits per mask */

     #ifndef howmany
     #define howmany(x, y)   (((x) + ((y) - 1)) / (y))

     typedef struct fd_set {
             fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)];
     } fd_set;

     #define FD_SET(n, p)    ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
     #define FD_CLR(n, p)    ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
     #define FD_ISSET(n, p)  ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
     #define FD_COPY(f, t)   memcpy(t, f, sizeof(*(f)))
     #define FD_ZERO(p)      memset(p, 0, sizeof(*(p)))

     #endif /* !defined(_POSIX_SOURCE) ... */
     #endif /* !_SYS_TYPES_H_ */

     lseek(2), select(2), truncate(2), byteorder(3), time(3), fs(5)

     A types file appeared in Version 7 AT&T UNIX.

BSD                              June 5, 1993                              BSD