If you want to stick to mmap, you can do it by creating a file which doesn’t have any actual disk backing (one way to do this is with POSIX shm_open), and handl

If you want to stick to mmap, you can do it by creating a file which doesn’t have any actual disk backing (one way to do this is with POSIX shm_open), and handling all memory allocations by mmapping parts of that file rather than mapping true anonymous memory. Then, ‘remapping’ an address to a new one is a matter of calling mmap again with the same file offset. Unlike mremap, this allows mapping the same memory at different addresses simultaneously, which can be useful for some purposes.