The error in both cases is "unable to lock: A file descriptor does not refer to an open file."

Considering your code does a plain exit if the flock fails, I quite surprised you get any error message at all.

Perhaps the code you are showing isn't the code you are running?

In reply to Re: Lightweight Solution To "Only 1 Process Running" On AIX by JavaFan
in thread Lightweight Solution To "Only 1 Process Running" On AIX by Limbic~Region

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