[Haskell-cafe] UDP client/server

[John Ky]

Hi,

What's wrong with my UDP client?

echoClient :: IO ()
echoClient = withSocketsDo $ do
    putStrLn "[a]"
    sock <- socket AF_INET Datagram 0
    putStrLn "[b]"
    connect sock (SockAddrInet 9900 iNADDR_ANY)
    putStrLn "[c]"
    n <- send sock "hi"
    putStrLn "[d]"
    return ()

I get:

*Main> echoClient
[a]
[b]
*** Exception: connect: failed (Cannot assign requested address
(WSAEADDRNOTAVAI
L))

Thanks

-John


On 1/12/07, Gregory Wright <gwright at comcast.net> wrote:
>
>
> Hi John,
>
> On Jan 11, 2007, at 10:35 AM, Gregory Wright wrote:
>
> >
> > Hi John,
> >
> > On Jan 11, 2007, at 1:58 AM, John Ky wrote:
> >
> >> Hello,
> >>
> >> Does anyone know where I can find a simple UDP client/server
> >> written in Haskell?
> >>
> >> Something along the lines of an echo server would do.
> >>
> >> Thanks
> >>
> >> -John
> >>
> >
> > Try:
> >
> >
>
> <snip>
>
> For testing, you need only use
>
>         gregory-wrights-powerbook-g4-17> nc -ul -p 9900 127.0.0.1
>
> and whatever you type should be echoed.  My original description
> of how to test:
> >
> > On my OS X/ppc 10.4.8 system, the above builds with ghc 6.6 and if
> > I open one
> > terminal with
> >
> > gregory-wrights-powerbook-g4-17> nc -u 127.0.0.1 9900
> >
> > and another with
> >
> > gregory-wrights-powerbook-g4-17> nc -ul -p 9900 127.0.0.1
> >
> > whatever I type into the first terminal appears on the second.  You
> > may have to
> > consult your documentation for the options to your version of nc
> > (or netcat,
> > if you use that instead).
>
> is wrong.  (It will copy from one terminal to the other when the
> daemon is not present.)
>
> Best,
> Greg
>
>
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