I have answered this question a couple of years ago on stackoverflow.com:

The Perl API provides PerlIO_exportFILE() which can convert a PerlIO handle with a file descriptor to a stdio `FILE` pointer. Since PerlIO::Scalar is an "in-memory" file handle without a file descriptor the conversion cannot succeed. The only portable way to pass a `PerlIO::Scalar` handle would be to flush it to a temporary file. The less portable way would be to use a stdio that supports callbacks, like the BSD implementation, funopen(3)

-- chansen

In reply to Re: XSub won't write to memory file by Hansen
in thread XSub won't write to memory file by syphilis

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