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TYPES(5)		     BSD Reference Manual		      TYPES(5)

NAME
     types - system data types

SYNOPSIS
     #include <sys/types.h>

DESCRIPTION
     The <sys/types.h> file 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 */
     #endif

     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	     id_t;	     /* may contain pid, uid or gid */
     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 int32_t	     pid_t;	     /* process id */
     typedef u_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 */
     typedef u_int32_t	     useconds_t;     /* microseconds */
     typedef int32_t	     suseconds_t;    /* microseconds (signed) */

     #ifdef  _BSD_CLOCK_T_
     typedef _BSD_CLOCK_T_   clock_t;
     #undef  _BSD_CLOCK_T_
     #endif

     #ifdef  _BSD_SIZE_T_
     typedef _BSD_SIZE_T_    size_t;
     #undef  _BSD_SIZE_T_
     #endif

     #ifdef  _BSD_SSIZE_T_
     typedef _BSD_SSIZE_T_   ssize_t;
     #undef  _BSD_SSIZE_T_
     #endif

     #ifdef  _BSD_TIME_T_
     typedef _BSD_TIME_T_    time_t;
     #undef  _BSD_TIME_T_
     #endif

     #ifdef  _BSD_CLOCKID_T_
     typedef _BSD_CLOCKID_T_ clockid_t;
     #undef  _BSD_CLOCKID_T_
     #endif

     #ifdef  _BSD_TIMER_T_
     typedef _BSD_TIMER_T_   timer_t;
     #undef  _BSD_TIMER_T_
     #endif

     #ifdef  _BSD_OFF_T_
     typedef _BSD_OFF_T_     off_t;
     #undef  _BSD_OFF_T_
     #endif

     #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) | (((x) & 0xffff0000) >> 8))
     #define makedev(x,y)    ((dev_t)((((x) & 0xff) << 8) | ((y) & 0xff) | (((y) & 0xffff00) << 8)))
     #endif

     #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	     1024
     #endif

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

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

     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_ */

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

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

MirOS BSD #10-current		 June 5, 1993				     2

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