리눅스 소켓통신할때 자신이 직접 호스트의 네트워크 인터페이스를 바인딩 하는방법

  // ------------------------------------------------------------------------
  // bind
  // ------------------------------------------------------------------------
  tcpSession->addr.sin_family = AF_INET;
  tcpSession->addr.sin_port = htons(quint16(localPort));
  if (localHost == 0)
  {
    tcpSession->addr.sin_addr.s_addr = INADDR_ANY;
  } else
  {
    IP ip = VNet::resolve(localHost);
    if (ip == 0)
    {
      SET_ERROR(VNetError, qformat("can not resolve host(%s)", qPrintable(localHost)), VERR_CAN_NOT_RESOLVE_HOST);
      return false;
    }
    tcpSession->addr.sin_addr.s_addr = htonl(ip);
  }
  memset(&tcpSession->addr.sin_zero, 0, sizeof(tcpSession->addr.sin_zero));
 
  int res = bind(tcpSession->handle, (SOCKADDR*)&tcpSession->addr, sizeof(tcpSession->addr));
  if (res == SOCKET_ERROR)
  {
    SET_ERROR(VSocketError, qformat("error in bind(%s:%d)", qPrintable(localHost), localPort), WSAGetLastError());
    return false;
  }