Data.Iteratee.IO.Posix

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Data.Iteratee.IO.Posix
Synopsis
type FileOffset = COff
myfdRead :: Fd -> Ptr CChar -> ByteCount -> IO (Either Errno ByteCount)
myfdSeek :: Fd -> SeekMode -> FileOffset -> IO (Either Errno FileOffset)
newtype Errno = Errno CInt
select'read'pending :: [Fd] -> IO (Either Errno [Fd])
Documentation
type FileOffset = COff
myfdRead :: Fd -> Ptr CChar -> ByteCount -> IO (Either Errno ByteCount)
Alas, GHC provides no function to read from Fd to an allocated buffer. The library function fdRead is not appropriate as it returns a string already. I'd rather get data from a buffer. Furthermore, fdRead (at least in GHC) allocates a new buffer each time it is called. This is a waste. Yet another problem with fdRead is in raising an exception on any IOError or even EOF. I'd rather avoid exceptions altogether.
myfdSeek :: Fd -> SeekMode -> FileOffset -> IO (Either Errno FileOffset)
The following fseek procedure throws no exceptions.
newtype Errno
Haskell representation for `errno` values. The implementation is deliberately exposed, to allow users to add their own definitions of `Errno` values.
Constructors
Errno CInt |
Instances
Eq Errno |
select'read'pending :: [Fd] -> IO (Either Errno [Fd])
poll if file descriptors have something to read Return the list of read-pending descriptors
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