The connection information record is used as a parameter in several of the procedure calls. It enables you and the TCP/IP program to exchange information about the connection. The Pascal declaration is shown in Figure 1.

Connection

A number identifying the connection that is described. This connection number is different from the connection number displayed by the NETSTAT command.

OpenAttemptTimeout

The number of seconds that TCP continues to attempt to open a connection. You specify this number. If the limit is exceeded, TCP stops trying to open the connection and shuts down any partially open connection.

BytesToRead

The number of data bytes received from the foreign host by TCP, but not yet delivered to the client. TCP maintains this value.

UnackedBytes

The number of bytes sent by your program, but not yet sent to the foreign TCP, or the number of bytes sent to the foreign TCP, but not yet acknowledged.

ConnectionState

The current state of the connection. ConnectionStateType defines the client program view of the state of a TCP connection, in a form more readily usable than the formal TCP connection state defined by RFC 793.

LocalSocket

The local internet address and local port. Together, these form one end of a connection. The foreign socket forms the other end. See Figure 2 for the Pascal declaration of the SocketType record.

ForeignSocket

The foreign, or remote, internet address and its associated port. These form one end of a connection. The local socket forms the other end. Figure 2 shows the Pascal declaration of a socket type.

Figure 2. Pascal declaration of socket type

   InternetAddressType = UnsignedIntegerType;
   PortType = UnsignedHalfWordType;
   SocketType =
        record
        Address: InternetAddressType;
        Port: PortType;
        end;

Address

The internet address.

Port

The port.