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ReznicencuBogdan wrote:And on google all the answers used some external libraries (<linux/kernel.h> , <fcntl.h> ,<sys/types.h>... etc.) which I don't have or don't know how to link to the kernel.

I don't think those kind of libraries are the ones for operating system development. Are you sure all the answers on Google are like that?

no92 wrote:Also, please tell me, is <linux/kernel.h> a library?

https://github.com/torvalds/linux

Well, the header file exists in the source code so yes.

john765 wrote:Well, the header file exists in the source code so yes.

You are kidding me, right? Just because there is a header file doesn't mean it is a library.

I have a suggestion: how about you copy that file into your OS and call a function from that header? Unless you have reimplemented the Linux kernel you'll end up with your linker throwing errors at you. Good luck mate.