All of the C program files for The Linux Programming Interface are available as individual web pages online. (If you want a complete code tarball, look here.)
You can browse the code in the following ways:
Nowadays, there are a few example programs in Go in the source code tarball. Those programs are not (currently) rendered as web pages. To view those programs, download the tarball.
If you have layout and design suggestions, HTML rendering errors to report, or program bugs to report, please email me.