[Haskell-cafe] trying to use unix's openFD ..

Brandon S. Allbery KF8NH allbery at ece.cmu.edu
Wed Jan 30 23:10:02 EST 2008

On Jan 30, 2008, at 23:05 , Galchin Vasili wrote:

> Hello,
>        The signature for openFD is
> openFd: FilePath
>             -> OpenMode
>             -> Maybe FileMode
>             -> OpenFileFlags
>             -> IO Fd
> I am currently reading http://www.haskell.org/ghc/docs/latest/html/ 
> libraries/unix/System-Posix-Files.html  and diving down into links  
> but can't find the definition of data type FileMode. ??? Basically  
> I want to open in O_RDONLY filemode.

That's an OpenMode, not a FileMode.  The FileMode values are at the  
top of System-Posix-Files.html and correspond to Unix open()'s third  
argument.  (ownerReadMode, etc.)  OpenMode is documented at the start  
of http://www.haskell.org/ghc/docs/latest/html/libraries/unix/System- 
Posix-IO.html .

brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university    KF8NH

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