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ttydoesn't report the controlling terminal, but the terminal open on stdin if any. Seeps -o tty= -p "$$"for the controlling terminal (in practice, they are generally the same at the prompt of an interactive shell).ps -o tty= -p "$$"works well! Is it not possible to get the controlling terminal of the current shell from/dev/tty?/dev/tty, callingioctl(TIOCGDEV, &dev)to obtain the maj:min devnum of the real tty, and then looking for it through/dev. But that will give ambiguous results when more than one devpts filesystem is mounted.