FD_SET
#define FD_SET(fd, set) ((set)->bits[_FD_BITSINDEX(fd)] |= _FD_BIT(fd))
#define FD_SET(n, p) ((p)->fds_bits[0] |= (1<<(n)))
#define FD_SET(n, p) ((p)->fds_bits[0] |= (1<<(n)))
#undef FD_SET
#define FD_SET(fd, maskp) \