# Linux Kernel Module Cheat

### 27.4. POSIX

Programs under userland/posix/ are examples of POSIX C programming.

These links provide a clear overview of what POSIX is:

- https://stackoverflow.com/questions/1780599/what-is-the-meaning-of-posix/31865755#31865755

- https://unix.stackexchange.com/questions/11983/what-exactly-is-posix/220877#220877

- Environment variables

- unistd.h

- fork

- pthreads

- sysconf

- mmap

- socket