Re: Proposal: add System.Posix.fdReadBuf/fdWriteBuf

marlowsd:

http://hackage.haskell.org/trac/ghc/ticket/3218

From the ticket:

Functions for reading/writing actual arrays of bytes in memory. At the moment, `System.Posix` only provides

{{{ fdRead :: Fd -> ByteCount -- ^How many bytes to read -> IO (String, ByteCount) -- ^The bytes read, how many bytes were read.

fdWrite :: Fd -> String -> IO ByteCount }}}

which are not only wrong (`String`?), but too slow for many purposes.

I propose

{{{ Mon May 11 16:21:02 BST 2009 Simon Marlow * add fdReadBuf, fdWriteBuf

-- | Read data from an 'Fd' into memory. This is exactly equivalent -- to the POSIX @read@ function. fdReadBuf :: Fd -> Ptr Word8 -- ^ Memory in which to put the data -> ByteCount -- ^ Maximum number of bytes to read -> IO Bytecount -- ^ Number of bytes read (zero for EOF)

-- | Write data from memory to an 'Fd'. This is exactly equivalent -- to the POSIX @write@ function. fdWriteBuf :: Fd -> Ptr Word8 -- ^ Memory containing the data to write -> ByteCount -- ^ Maximum number of bytes to write -> IO ByteCount -- ^ Number of bytes written }}}

darcs patches are attached to the ticket.

Discussion: 2 weeks (ends 25 May)

Rocking. Go for it.