[ moved to libraries@haskell.org from haskell@haskell.org] On 12 October 2005 21:01, John Goerzen wrote:

I'm wanting to set the SO_RCVTIMEO and SO_SNDTIMEO options on a socket from Haskell. socket(7) say that these take a struct timeval ad a parameter. (Other options, such as SO_LONGER, also could have this problem.)

In Haskell, we see:

setSocketOption :: Socket -> SocketOption -> Int -> IO ()

Now, there are SocketOption constructors (RecvTimeOut and SendTimeOut) for what I want. But there is no way to give it a proper timeval (and yes, I checked the source.)

setSocketOption definately wants an Int, and is passing the length of the Int to setsockopt(2) as well, so it appears to me that there is absolutely no way to correctly specify SO_RCVTIMEO or SO_SNDTIMEO through Haskell's socket layer.

Is that correct?

If so, how can we fix it?

Looks like that interface is fairly broken to me. SocketOption should be an albebraic type with the appropraite parameters to each constructor. Fortunately everything is exported non-abstractly from Network.Socket so you can implement your own setSocketOption. If you come up with some code, I'll incorporate it, or just submit a bug report. Cheers, Simon