FD_SET
# undef FD_SET
# define FD_SET(n, set) kludge_FD_SET(n, set)
#undef FD_SET
#define FD_SET(fd, maskp) \
#define FD_SET(n, p) ((p)->__fds_bits[__fdset_idx(p, n)] |= __fdset_mask(n))