[Haskell-cafe] trying to use unix's openFD ..
vigalchin at gmail.com
Wed Jan 30 23:25:02 EST 2008
i.e. only the Linux CDROM device driver in read-only mode....
On Jan 30, 2008 11:23 PM, Galchin Vasili <vigalchin at gmail.com> wrote:
> 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 ???
> Regards, Vasili
> 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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