If you can modify the child process, does using Perl::Unsafe::Signals clear up the issue? If so, it's the change in when Perl checks for signals that's tripping you.

In reply to Re: Need a reliable way to send SIGINT to a perl process on 5.8.8/windows XPpro by chromatic
in thread Need a reliable way to send SIGINT to a perl process on 5.8.8/windows XPpro by fwashbur

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