sig() is not defined in the immediate class you used, but defined in POE::Kernel. What you need to do is to first create a POE::Kernel object, say $kernel, then:
$kernel->sig($signal_name, $state_name);
Give a try.
But I do think POE should provide better and more clear documentation, at least say something like "please see POE::Kernel for details about how to use sig()", if they don't want people to reconsider :-) especially when standard Perl distribution itself is getting better.
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