My toolchain (Realview) does not have implementation of unistd.h, I have a code that I need to use that is using unistd.h, some function like access, open.
So I need to implement this functions by myself.
My question is, is there another alternative or some reference (except the function description, found here) that I can use in order to port/implement these functions?
What is the correct way to do that? It's my first time posting.
The "function description" you link to has the page title "The Open Group Base Specifications Issue 6", which indicates that it's perhaps a bit more of a heavy-weight than just being a mere description.
If you implement a function that fulfills all the text on that page correctly, chances are you've managed to re-implement it in a compatible way, so that programs complying to the same standard will build and work.
Not sure what else you feel you would need.