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Ah okay, I think I understand more now. Thanks for the link, I'll check it out!

Basically this is a kernel running in userspace, not hooking into the actual kernel running in kernel space?

Yes, it's the Linux kernel, compiled as a (userspace) library, and linked to applications. The applications use lkl_sys_* functions to call "system calls" in this code-running-as-a-library.

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