Warren Young wrote:
stop running services before starting the upgrade.
Thinking more about it, couldn't you just call LoadLibrary() on the full path to cygwin.dll, and if that succeeds, get the process list from it and send out kill signals?
If LoadLibrary() doesn't succeed, either Cygwin isn't installed, or the DLL has gone missing; in either case, you can probably upgrade without a reboot anyway.
