Are rename() and unlink() asynchronous functions?

Question

I have strong reason to believe that both functions rename() and unlink() are asynchronous, which, from my understanding, means that when the functions are called, the code belo

Answer 1

I suppose they are not asynchronous, because they return a result telling if the operation was successful or not.

I believe the problem happens because when you run scandir after making the modifications, it may be using "cached" data, from memory, instead of re-scanning the file system.