MODE_BTMODE      3679 io.c           	    return MODE_BTMODE("a+", "ab+", "at+");
MODE_BTMODE      3681 io.c           	return MODE_BTMODE("a", "ab", "at");
MODE_BTMODE      3685 io.c           	return MODE_BTMODE("r", "rb", "rt");
MODE_BTMODE      3687 io.c           	return MODE_BTMODE("w", "wb", "wt");
MODE_BTMODE      3690 io.c           	    return MODE_BTMODE("w+", "wb+", "wt+");
MODE_BTMODE      3692 io.c           	return MODE_BTMODE("r+", "rb+", "rt+");