I have heard that when you call "realloc", it will first try to expand the current memory you have and if it cannot do that, it will allocate a new memory address and return that instead. Ok, that's great!
The thing is, how exactly it "expands" memory? I checked and I couldn't find a system call that does that. I don't know how memory and virtual memory in different Operating Systems so I just know that when you allocate memory, you mark a specific block of memory as "used" by your process. So if you wanted to "expand" this block, I would think that you have to `free` the previous block and allocate a new bigger/smaller one. Any ideas?
