[Haskell-cafe] trying to use unix's openFD ..
vigalchin at gmail.com
Wed Jan 30 23:23:59 EST 2008
I am trying to do the following on RedHat RHEL 5.0:
main = do
fs <- openFd "/dev/cdrom" ReadOnly (Just ???) defaultFileFlags
putStrLn (show fd)
what should (Just ???) be ???
On Jan 30, 2008 11:10 PM, Brandon S. Allbery KF8NH <allbery at ece.cmu.edu>
> 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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