Below is the relevant source code. David foreign import ccall unsafe "my_inet_ntoa" c_inet_ntoa :: HostAddress -> IO (Ptr CChar) foreign import CALLCONV unsafe "inet_addr" c_inet_addr :: Ptr CChar -> IO HostAddress -- ----------------------------------------------------------------------------- -- Internet address manipulation routines: inet_addr :: String -> IO HostAddress inet_addr ipstr = do withCString ipstr $ \str -> do had <- c_inet_addr str if had == -1 then ioError (userError ("inet_addr: Malformed address: " ++ ipstr)) else return had -- network byte order inet_ntoa :: HostAddress -> IO String inet_ntoa haddr = do pstr <- c_inet_ntoa haddr peekCString pstr On 5/7/05, Dominic Steinitz wrote:

Does anyone know why these are in the IO monad? Aren't they pure functions converting between dotted-decimal strings and a 32-bit network byte ordered binary value?

Dominic.

http://www.haskell.org/ghc/docs/latest/html/libraries/network/Network.Socket... http://www.haskell.org/ghc/docs/latest/html/libraries/network/Network.Socket...

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