TYPES(5)                             BSD                              TYPES(5)



NAME
     types - primitive system data types

SYNOPSIS
     #include <sys/types.h>

DESCRIPTION
     The data types defined in the include file are used in Domain/OS BSD
     system code; some data of these types are accessible to user code.

     The following data types are defined if including <sys/types.h> and
     compiling with the -A ansi cc(1) option:

     typedef  long           dev_t;     /* <old device number> type */
     typedef  unsigned long  ino_t;     /* <inode> type */
     typedef  unsigned long  mode_t;    /* file attributes */
     typedef  short          nlink_t;   /* link count */
     typedef  int            __gid_t;
     typedef  long           __off_t;
     typedef  int            __pid_t;
     typedef  long           ssize_t;
     typedef  unsigned long  size_t;
     typedef  int            __uid_t;
     typedef  __gid_t        gid_t;     /* group ID */
     typedef  __off_t        off_t;     /* <offset> type */
     typedef  __pid_t        pid_t;     /* process id/process group id*/
     typedef  __uid_t        uid_t;     /* user ID */
     typedef  long           daddr_t;   /* <disk address> type */
     typedef  char *         caddr_t;   /* ?<core address> type */
     typedef  long           swblk_t;

     The following are defined in addition to the above, if the -A nansi or -A
     xansi compiler option is used:

     typedef  long            key_t;     /* IPC key type */
     typedef  long            clock_t;
     typedef  long            time_t;

     /* major part of a device */
     #define  major(x)        ((int)(((unsigned)(x)>>9)&0x7FFFFF))

     /* minor part of a device */
     #define  minor(x)        ((int)((x)&0x1FF))

     /* make a device number */
     #define  makedev(x,y)    ((dev_t)(((x)<<9) | (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 */

     typedef  struct          _quad { long val[2]; } quad;

     #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 >= NOFILE (param.h).
      */

     #define  FD_SETSIZE      256

     typedef  long            fd_mask;

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

     #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_ZERO(p)      bzero((char *)(p), sizeof(*(p)))

     typedef  int             oid_t;     /* organization ID */

     The form daddr_t is used for disk addresses except in an inode on disk.
     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.

SEE ALSO
     time(3), lseek(2)