How can I get back to the interactive keyboard if stdin is redirected?

C Interview Questions and Answers

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How can I get back to the interactive keyboard if stdin is redirected?

Q: I'm trying to write a program like ``more.'' How can I get back to the interactive keyboard if stdin is redirected?

A:There is no portable way of doing this. Under Unix, you can open the special file /dev/tty. Under MS-DOS, you can try opening the ``file'' CON, or use routines or BIOS calls such as getch which may go to the keyboard whether or not input is redirected.

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