# Linux Kernel Module Cheat
The perfect emulation setup to study and develop the <<linux-kernel>> v5.9.2, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>.

### 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