rb_io_stdio_file  425 ext/dl/cptr.c  	fp = rb_io_stdio_file(fptr);
rb_io_stdio_file  274 ext/readline/readline.c     rl_instream = rb_io_stdio_file(ifp);
rb_io_stdio_file  295 ext/readline/readline.c     rl_outstream = rb_io_stdio_file(ofp);
rb_io_stdio_file  141 include/ruby/io.h FILE *rb_io_stdio_file(rb_io_t *fptr);