Networking III

Ancient slides on client/server computing

• C programming for clients
• C programming for servers
• Networking internals

Networking programming Examples

The client calls

Here are the Python socket calls that are similar to the BSD system calls. Take a look at the constants.

• socket.socket
• socket.send
• socket.recv
• socket.close

Here are a few useful Python calls a bit above the system call level.

• socket.makefile
• socket.sendall

Here are a few, now largely unused, Python calls that were once heavily used Berkely C routines.

• socket.gethostbyname
• socket.gethostbyaddr
• socket.getservbyport
• socket.htons
• socket.ntohs

This is a silly way to list sixteen squares.

• Python 3 client

The server calls

Remember: You can blame RFC 793 for most of this.

• socket.bind
• socket.accept

Here is a series of servers, that echo JSON expressions, that grow up to do the job.

• One connection only
• One connection at a time
• Concurrent connections — Introducing the fork
• Concurrent connections without zombies
• One connection at a time using socketserver — handles termination ungracefully
• Connurent connections using socketserver with threading — tries to terminate early