rb_file_open_generic 4273 io.c               return rb_file_open_generic(io, filename,
rb_file_open_generic 4913 io.c               rb_file_open_generic(io, fname, oflags, fmode, &convconfig, perm);
rb_file_open_generic 5177 io.c                   return rb_file_open_generic(io_alloc(rb_cFile), filename,