updating doc

Network/Socket.hs

@@ -143,6 +143,7 @@ module Network.Socket
                   ,RecvIPv4TTL,RecvIPv4TOS,RecvIPv4PktInfo
                   ,RecvIPv6HopLimit,RecvIPv6TClass,RecvIPv6PktInfo)
     , StructLinger (..)
+    , SocketTimeout (..)
     , isSupportedSocketOption
     , whenSupported
     , getSocketOption

Network/Socket/ByteString/IO.hsc

@@ -232,6 +232,11 @@ sendManyTo s cs addr = do
 --
 -- For TCP sockets, a zero length return value means the peer has
 -- closed its half side of the connection.
+--
+-- Currently, the 'recv' family is blocked on Windows because a proper
+-- IO manager is not implemented. To use with 'System.Timeout.timeout'
+-- on Windows, use 'Network.Socket.setSocketOption' with
+-- 'Network.Socket.RecvTimeOut' as well.
 recv :: Socket        -- ^ Connected socket
      -> Int            -- ^ Maximum number of bytes to receive
      -> IO ByteString  -- ^ Data received

Network/Socket/Options.hsc

@@ -26,6 +26,7 @@ module Network.Socket.Options (
   , getSockOpt
   , setSockOpt
   , StructLinger (..)
+  , SocketTimeout (..)
   ) where
 
 import qualified Text.Read as P
@@ -251,14 +252,14 @@ pattern SendLowWater   = SockOpt (#const SOL_SOCKET) (#const SO_SNDLOWAT)
 #else
 pattern SendLowWater   = SockOpt (-1) (-1)
 #endif
--- | SO_RCVTIMEO: this does not work at this moment.
+-- | SO_RCVTIMEO: timeout in microseconds
 pattern RecvTimeOut :: SocketOption
 #ifdef SO_RCVTIMEO
 pattern RecvTimeOut    = SockOpt (#const SOL_SOCKET) (#const SO_RCVTIMEO)
 #else
 pattern RecvTimeOut    = SockOpt (-1) (-1)
 #endif
--- | SO_SNDTIMEO: this does not work at this moment.
+-- | SO_SNDTIMEO: timeout in microseconds
 pattern SendTimeOut :: SocketOption
 #ifdef SO_SNDTIMEO
 pattern SendTimeOut    = SockOpt (#const SOL_SOCKET) (#const SO_SNDTIMEO)
@@ -481,6 +482,8 @@ instance Storable StructLinger where
 ----------------------------------------------------------------
 
 -- | Timeout in microseconds.
+--   This will be converted into struct timeval on Unix and
+--   DWORD (as milliseconds) on Windows.
 newtype SocketTimeout = SocketTimeout Word32 deriving (Eq, Ord, Show)
 
 #if defined(mingw32_HOST_OS)