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
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