C

Recap In Day 1, we built the simplest possible TCP server in C: a blocking echo server that handled one client at a time. That worked fine for basic tests, but it had a major limitation — a second client had to wait until the first one disconnected. Today, we fix that by introducing fork(). The Idea: fork() per Client Unix gives us a neat primitive: fork(). It clones the current process into a child, which can run independently of the parent. ...

Start from a single-thread blocking TCP echo server. Why it matters, how it works, pitfalls (EINTR, SO_REUSEADDR), and what’s next: forked/threaded → select → epoll.