See ActiveState's ActivePerl FAQ - Implementation Quirks documentation, "Why doesn't signal handling work on Windows?". Signals are a UNIX thing, and are only implemented in the C runtime library on Windows enough to conform to C89 standards. For example, on Linux sleep will raise a SIGALRM when it times out, but on Windows SIGALRM is not supported (alarm is one of the functions listed as not implemented by ActiveState). Windows uses a different architecture for console handling compared to UNIX terminal handling. In Win32 a CTRL+C (or Break) is controlled using SetConsoleCtrlHandler, not signals in the UNIX sense (even though the MSDN talks about raising a signal).
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