[cs631apue] Suspend stdin, wait for another user input

[Hongyi Shen]

This problem has frustrated me for hours.

In the requirement of HW5,

echo "Kookaburra has left the tree" | aed -e | aed -d

Then we want user to input passphrase, but scanf will read "Kookaburra
has left the tree" first, instead of waiting for user's passphrase.

（When use pipe, isatty might be a way）


Thank you all, enjoy the holiday.
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