Oops. My "long" is indeed Int32 :(. Thank you for pointing that out.
To avoid surprises like this, have a look at:
http://haskell.org/ghc/docs/latest/html/base/Foreign.C.Types.html
On the other hand, when you really want to fix the sizes of the integral types, use e.g. Int32 on the Haskell side and int32_t on the C side.
Cheers, S.
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