Sure enough, the lock file is gone

The 'tmpwatch' program on Red Hat will remove the /tmp/.s.PGSQL.5432.lock
file after the server has run 6 days.  This will be a problem.

We could touch (open) the file once every time the ServerLoop() runs
around.  It's not perfect but it should work in practice.

-- 
Peter Eisentraut      peter_e@gmx.net       http://yi.org/peter-e/