Hi -
I've got a Haskell module with the following ffi import:
foreign import ccall duma_init :: Int -> IO Int
However my problem is that I've got no idea what the type signature for the
corresponding C function should be, and when I compile the above module with
ghc -fglasgow-exts -fffi --make it doesn't create any stubs either.
I've tried looking at the wiki but that only seems to give specific
examples. I'm trying to find what the mapping is between Haskell function
signatures and C signatures is in general. Any ideas?
Also, I really wanted to be able to use () -> IO () but () doesn't seem to
be allowed in FFI...
A third point is, how would I pass an arbitrary monad instead of just using
IO?
Thanks, Brian.
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