__fd_mask          56 sys/select.h   #define __NFDBITS ((unsigned)(sizeof(__fd_mask) * __NBBY)) /* bits per mask */
__fd_mask          60 sys/select.h   	__fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)];
__fd_mask          79 sys/select.h   #define fd_mask	__fd_mask