16.9 Using Sockets with Connections

The most common communication styles involve making a connection to a particular other socket, and then exchanging data with that socket over and over. Making a connection is asymmetric; one side (the client) acts to request a connection, while the other side (the server) makes a socket and waits for the connection request.

• Connecting: What the client program must do.
• Listening: How a server program waits for requests.
• Accepting Connections: What the server does when it gets a request.
• Who is Connected: Getting the address of the other side of a connection.
• Transferring Data: How to send and receive data.
• Byte Stream Example: An example program: a client for communicating over a byte stream socket in the Internet namespace.
• Server Example: A corresponding server program.
• Out-of-Band Data: This is an advanced feature.