lpd lock file

[utzoo!decvax!ucbvax!unix-wizards]

>From dsp.dove at MIT-SPEECH@MIT-AI Tue Aug 18 08:52:50 1981
A better way of making a lock file is to have lpd make a dummy with
its pid, clear all write bits, and link it as the lockfile.  Then
arrange for the lpd to ignore some specific signal.  To find out if a
given lockfile has an associated lpd just read the lockfile, signal
that proc with the ignored signal and see if it succeeds.

Why couldn't this work for the rand editor?

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