Examples of TCP sockets using Python and different I/O models
Every script can be launched with up to 2 parameters: host and port.
You may provide them to either connect to a remote machine or to change
port.
Default values for server scripts are host:'', port:9999.
Default values for client scripts are host:localhost, port:9999.
The simplest TCP server is the echo service, every byte received by a client is sent back to it (thus echoing its requests).
This simplicity makes the echo server suitable as an Hello, world! for sockets.
An example is provided using the select system call.
wait_fd_select/echo_server_select.py
As the name suggests, this is a simple implementation of a Layer 4 protocol (application) and provides a kickstart for socket programming, that you might further extend.
Different examples are provided using different I/O models:
- blocking I/O with threading in
naive_server.py - blocking I/O with socketserver in
sockserver_mod.py
This is a simple file transfer program that provides a quick way to move files across the network, and provides a basic and raw authentication mechanism.
Both server and client are provided in students_file_trasnfer directory.
A non-blocking I/O model using POSIX syscall select is a portable way of programming networked applications.