Maybe you could use the __WARN__ signal.
Something like... 
$SIG{__WARN__} = sub {
   SomeModule::errhandler(@_);
};

[download]
Now all warn, carp and cluck commands should get routed through this code.

In reply to Re: Catch messages to STDERR by mifflin
in thread Catch messages to STDERR by Räuber Hotzenplotz

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