Workers deleting pidfile because of inherited at_exit handler

[srgpqt]

In daemon mode, when a worker process exits (for example, in a phased-restart) it will delete the main process pidfile.

This is because forked workers inherit the parent process' at_exit handlers and at_exit is used for deleting the pidfile like so : at_exit { delete_pidfile }

This is undesirable -- monitoring programs like monit think the daemon has shut down because the pidfile is missing.

I'm not sure how this could be handled better. Add a check in delete_pidfile to make sure only the parent process deletes the file? Or use something other than at_exit?

[srgpqt]

Thanks for the quick fix!