Problem with reading startup packet after fork

I think there will be a race condition around the time of a database
shutdown.  After a new child process is created, the system may go into
shutdown mode.  However, there is a window where the child won't know
this, because the signal is blocked and/or not set up yet.  Note that we
cannot check for shutdown before forking the child because we won't know
yet whether the incoming packet is actually a connection request.  We
wouldn't want to send back an error in response to a cancel request, for
example.

Any ideas?

-- 
Peter Eisentraut   peter_e@gmx.net   http://funkturm.homeip.net/~peter