I've always been under the impression that redirections are inherited to° a child process.
But you should know better.
> libtiff provides a TIFFSetWarningHandler function just for customizing error reporting.
I've recommended this myself, but I'm not sure if this interface allows a Perl sub as call back.
°) Correction: to "bequeath", to "pass on" in correct English, "inherit" can't be used that way
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