Finding a stream's filename

[Nick Sayer]

I am in the midst of writing a new getty for a terribly ancient
machine, whose init passes getty only a single character, from which
it is to divine all the terminal data.

Trouble is, I want this getty to look at the uucp lock files to see
if uucp wants to use the phone. getty can't figure out the filename
of the lock file, because getty doesn't know what terminal it's
running on!

Can a process either 1) find the filename associated with an fopened
or opened file (and then then let me do it on stdout) or 2) find
out what device it's running on (less nice).

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