rb_fd_dup         341 include/ruby/intern.h #define rb_fd_dup(d, s)	rb_w32_fd_dup((d), (s))
rb_fd_dup         357 include/ruby/intern.h #define rb_fd_dup(d, s) (*(d) = *(s))
rb_fd_dup        3520 thread.c       rb_fd_dup(rb_fdset_t *dst, const rb_fdset_t *src)