prep_stdio       2890 io.c           		    rb_defout = prep_stdio(fw, FMODE_WRITABLE, rb_cFile);
prep_stdio       2893 io.c           		current_file = prep_stdio(fr, FMODE_READABLE, rb_cFile);
prep_stdio       3431 io.c               r = prep_stdio(rb_fdopen(pipes[0], "r"), FMODE_READABLE, rb_cIO);
prep_stdio       3432 io.c               w = prep_stdio(rb_fdopen(pipes[1], "w"), FMODE_WRITABLE|FMODE_SYNC, rb_cIO);
prep_stdio       3924 io.c               rb_stdin = orig_stdin = prep_stdio(stdin, FMODE_READABLE, rb_cIO);
prep_stdio       3926 io.c               rb_stdout = orig_stdout = prep_stdio(stdout, FMODE_WRITABLE, rb_cIO);
prep_stdio       3928 io.c               rb_stderr = orig_stderr = prep_stdio(stderr, FMODE_WRITABLE, rb_cIO);