Linux › Section J · Network applications and services › Topic J.5
Network sockets and Unix domain sockets
Every network program, and a great many programs that never touch a network, talk through sockets. Seeing how a server uses them, and how Unix domain sockets carry traffic between processes on one machine, explains much of what ss and lsof show on a running system.
In this topic
- Sockets: where user space meets the network
- Families and types
- How a TCP server uses two kinds of socket
- Worked example: matching ss output to the calls
- Unix domain sockets
- Worked example: a local echo service in Python
- Permissions, identity and stale files
- Abstract and unnamed sockets
- Seeing Unix sockets on a system
- Common mistakes to avoid
- Key takeaways
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