rb_fd_clr         232 include/ruby/intern.h #define rb_fd_clr(n, f)		rb_w32_fdclr(n, (f)->fdset)
rb_fd_clr         244 include/ruby/intern.h #define rb_fd_clr(n, f)	FD_CLR(n, f)
rb_fd_clr        2199 thread.c       rb_fd_clr(int n, rb_fdset_t *fds)