#ifdef FD_SETSIZE

#define    __DARWIN_FD_SETSIZE    FD_SETSIZE

#else /* !FD_SETSIZE */

#define    __DARWIN_FD_SETSIZE    1024

#endif /* FD_SETSIZE */

#define    __DARWIN_NBBY        8                /* bits in a byte */

#define __DARWIN_NFDBITS    (sizeof(__int32_t) * __DARWIN_NBBY) /* bits per mask */

#define    __DARWIN_howmany(x, y)    ((((x) % (y)) == 0) ? ((x) / (y)) : (((x) / (y)) + 1)) /* # y's == x bits? */

__BEGIN_DECLS

typedef    struct fd_set {

    __int32_t    fds_bits[__DARWIN_howmany(__DARWIN_FD_SETSIZE, __DARWIN_NFDBITS)];

} fd_set;

__END_DECLS