FD_CLR
#undef FD_CLR
#define FD_CLR(fd, maskp) \
#define FD_CLR(n, p) ((p)->fds_bits[0] &= ~(1<<(n)))
#define FD_CLR(n, p) \
#define FD_CLR(n, p) ((p)->fds_bits[0] &= ~(1<<(n)))