Example client and server code

The following code implements a client and server that communicate using XTI over a NetBIOS connection. The server opens the file logfile, reads the contents in 1K chunks, and sends each chunk to the client. The client reads each chunk of data over the NetBIOS connection, then writes it to the standard output.

This code has at least two interesting features:

• The server is concurrent, that is, it communicates with the client through a child process that uses a transport endpoint (conn_fd) different from the one that the parent process listens on for incoming connection requests (listen_fd). This, along with a value for bind->qlen that is greater than one (five, in this example) in the call to t_bind, allows the server to respond to incoming connection requests in parallel.

• The client and server implement an application-level protocol to ensure that the client receives all the data that the server sends. The application implements this protocol because SCO NetBIOS and NetBEUI do not support a connection-oriented service with orderly release.