C > winsock error

void handle_error(void)
  {
    /*
     * Errors are handled by calling the WSAGetLastError routine which
     * will return the last error as one of the following. As we develop
     * this tutorial, we will go into much more detail on what they mean
     * and what caused them.
     */

    switch ( WSAGetLastError() )
    {
      case WSANOTINITIALISED :
        printf("Unable to initialise socket.\n");
      break;
      case WSAEAFNOSUPPORT :
        printf("The specified address family is not supported.\n");
      break;
      case WSAEADDRNOTAVAIL :
        printf("Specified address is not available from the local machine.\n");
      break;
      case WSAECONNREFUSED :
        printf("The attempt to connect was forcefully rejected.\n");
        break;
      case WSAEDESTADDRREQ :
        printf("address destination address is required.\n");
      break;
      case WSAEFAULT :
        printf("The namelen argument is incorrect.\n");
      break;
      case WSAEINVAL :
        printf("The socket is not already bound to an address.\n");
      break;
      case WSAEISCONN :
        printf("The socket is already connected.\n");
      break;
      case WSAEADDRINUSE :
        printf("The specified address is already in use.\n");
      break;
      case WSAEMFILE :
        printf("No more file descriptors are available.\n");
      break;
      case WSAENOBUFS :
        printf("No buffer space available. The socket cannot be created.\n");
      break;
      case WSAEPROTONOSUPPORT :
        printf("The specified protocol is not supported.\n");
        break;
      case WSAEPROTOTYPE :
        printf("The specified protocol is the wrong type for this socket.\n");
      break;
      case WSAENETUNREACH :
        printf("The network can't be reached from this host at this time.\n");
      break;
      case WSAENOTSOCK :
         printf("The descriptor is not a socket.\n");
      break;
      case WSAETIMEDOUT :
        printf("Attempt timed out without establishing a connection.\n");
      break;
      case WSAESOCKTNOSUPPORT :
         printf("Socket type is not supported in this address family.\n");
      break;
      case WSAENETDOWN :
        printf("Network subsystem failure.\n");
      break;
      case WSAHOST_NOT_FOUND :
        printf("Authoritative Answer Host not found.\n");
      break;
      case WSATRY_AGAIN :
        printf("Non-Authoritative Host not found or SERVERFAIL.\n");
       break;
      case WSANO_RECOVERY :
         printf("Non recoverable errors, FORMERR, REFUSED, NOTIMP.\n");
      break;
      case WSANO_DATA :
        printf("Valid name, no data record of requested type.\n");
      break;
        case WSAEINPROGRESS :
        printf("address blocking Windows Sockets operation is in progress.\n");
      break;
      case WSAEINTR :
        printf("The (blocking) call was canceled via WSACancelBlockingCall().\n");
      break;
      default :
        printf("Unknown error.\n");
       break;
  }

  WSACleanup();
  exit(0);
}