fds_bits          123 include/sys/types.h 	fd_mask	fds_bits[howmany(FD_SETSIZE, NFDBITS)];
fds_bits          126 include/sys/types.h #define	FD_SET(n, p)	((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
fds_bits          127 include/sys/types.h #define	FD_CLR(n, p)	((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
fds_bits          128 include/sys/types.h #define	FD_ISSET(n, p)	((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))