passing a Handle to a C function

[Volker Stolz]

In local.glasgow-haskell-users, you wrote:
> For Unix, use Posix.handleToFd to get a descriptor, then fdopen() (in
> C, or write a foreign import) to get a FILE*.
> Also, don't forget about synchronisation issues between the C and
> Haskell interfaces to the descriptor (e.g. buffering).

After the 'handleToFd', there shouldn't be any issues of interference
because the handle becomes unusable in Haskell-land.

Volker
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