"auto-backgrounding" uses fork (I assume). flock says:

On systems that support a real flock(), locks are inherited across fork() calls, whereas those that must resort to the more capricious fcntl() function lose the locks, making it harder to write servers.
so I'd be sure to not grab the lock until after forking.

                - tye

In reply to Re: Keeping File Locks after Daemonization (fork) by tye
in thread Keeping File Locks after Daemonization by SIGSEGV

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