Create haskel socket client

Question

I try to connect to created socket by haskell:

-- Logger
  putStrLn "Create socket"
  sock_logger <- socket AF_INET Stream 0     
  putStrLn "Bind socket"           
  connect sock_logger (SockAddrInet 5000 0)    
  putStrLn "Listen socket"  
  listen sock_logger 2                                  
  putStrLn "Logger listening on port 5000..."
  (conn_logger, _) <- accept sock_logger                       
  putStrLn "Logger connection accepted"

Scocket already created by other application. But after connect sock_logger (SockAddrInet 5000 0) i get

helloworld-exe.EXE: Network.Socket.connect: <socket: 440>: failed (Cannot assign requested address (WSAEADDRNOTAVAIL))

How can i connect to socket as client (without creation new socket) All sockets i create with SockAddrInet 5000 0. Can it depends on addlress (maybe need 127.0.0.1 instead localhost?)

Hm, I'm not a socket expert, but isn't `listen` usually done after a `bind`, not a `connect`? i.e. the pattern for servers is `bind`, `listen`, `accept`*, then you can send and receive on the result, while for clients it is `connect`, then you can send and receive on the result. — Daniel Wagner, Jun 15 '22 at 22:10

score 0 · Accepted Answer · answered Jun 15 '22 at 22:06

0

Perhaps you're looking for tupleToHostAddress, as in

connect sock_logger (SockAddrInet 5000 (tupleToHostAddress (127, 0, 0, 1)))

answered Jun 15 '22 at 22:06

Daniel Wagner

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score 0 · Answer 2 · answered Jun 16 '22 at 04:39

Thx Daniel Wagner, it's really need to use tupleToHostAddress (127, 0, 0, 1) and listen ... is wrong. Right version:

  putStrLn "Create socket"
  sock_logger <- socket AF_INET Stream 0     
  putStrLn "Bind socket"           
  connect sock_logger (SockAddrInet 5000 (tupleToHostAddress (127, 0, 0, 1)))                      
  putStrLn "Connected to logger on port 5000..."

Create haskel socket client

2 Answers2