I've now realised that this is actually the same problem as described in the thread "Re: Bash returns incorrect process status" - it's the fact that bash is reusing process ids that is causing the problem. I've tried the patch in http://cygwin.com/ml/cygwin/2004-09/msg00783.html and it prevents the errors.
Tony
--
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Problem reports: http://cygwin.com/problems.html
Documentation: http://cygwin.com/docs.html
FAQ: http://cygwin.com/faq/
