in reply to Re: Capturing XS printf output with a tied filehandle
in thread Capturing XS printf output with a tied filehandle

That link is useful but does not address the OP's (admittedly very specific) use case and issue. The previous discussion explains how to capture XS output in general, but not with a tied file handle.
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Re^3: Capturing XS printf output with a tied filehandle
by Anonymous Monk on Feb 17, 2012 at 04:10 UTC
    And?