gettty(tty);

		// open stdin
        open(tty, 0);

		// stat from file name
		stat(tty, &st_tty);

		// stat from file descriptor
		fstat(0, &st0);
		fstat(1, &st1);

		if (st_tty.st_dev != st0.st_dev || st_tty.st_ino != st0.st_ino) { left_redirect = 1; }
		if (st_tty.st_dev != st1.st_dev || st_tty.st_ino != st1.st_ino) { right_redirect = 1; }