io_file_read      264 lib_io.c         n = io_file_read(L, iof->fp, 0);
io_file_read      296 lib_io.c         return io_file_read(L, io_tofile(L)->fp, 1);
io_file_read      445 lib_io.c         return io_file_read(L, io_stdfile(L, GCROOT_IO_INPUT), 0);