[Haskell-cafe] ANNOUNCE: cinvoke 0.1 released

[Yves Parès]

It evokes me Python's ctypes module.
Nice job ! I think It will be useful.


2011/3/6 Remi Turk <rturk at science.uva.nl>

> I am happy to finally announce cinvoke 0.1, a binding to the
> C library cinvoke[1], allowing functions to be loaded and called
> whose names and types are not known before run-time.
>
> Why?
>
> Sometimes you can't use the Haskell foreign function interface
> because you parse the type of the function from somewhere else,
> i.e. you're writing an interpreter for a language that has an FFI
> itself.
>
> What?
>
> The main function it exports is:
>
>  cinvoke :: Symbol -> RetType b -> [Arg] -> IO b
>
> And because code is worth a thousand words, here's a small program
> that uses libc to write a 1Gb buffer of random garbage to a file:
>
> > module Main where
> >
> > import Foreign.CInvoke
> >
> > main = do
> >     cxt <- newContext
> >     libc <- loadLibrary cxt "libc.so.6"
> >     malloc <- loadSymbol libc "malloc"
> >     creat  <- loadSymbol libc "creat"
> >     write  <- loadSymbol libc "write"
> >     free   <- loadSymbol libc "free"
> >     let sz = 2^30
> >     buf <- cinvoke malloc (retPtr retVoid)
> >                                     [argCSize sz]
> >     fd  <- cinvoke creat  retCInt   [argString "/tmp/test", argCUInt
> 0o644]
> >     n   <- cinvoke write  retCSize  [argCInt fd, argPtr buf, argCSize sz]
> >     cinvoke free (retPtr retVoid) [argPtr buf]
>
> It hopefully works on any machine on which cinvoke works,
> but has only been tested on linux x86_64.
> As the current version of cinvoke only installs a static library,
> it does not work from GHCi at the moment (without hacking cinvoke
> to build a shared library).
> More interesting examples are included in examples/ in the
> package.
>
> Where?
> Hackage: http://hackage.haskell.org/package/cinvoke
>
> Cheers, Remi
>
> [1] http://www.nongnu.org/cinvoke/
>
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