/**
 * The sanakirja database exists to allow the creation of data
 * structures that most naturally lives in memory-mapped files.
 *
 * It is structured around pages, through two traits AllocPage and
 * LoadPage. The assumption is that pages have 4K bytes.
 *
 * There is a Storable macro that types can implement to indicate they
 * can be stored on disk. Implementations should allow for comparing
 * types, getting references from a page to other pages (if they
 * exist).
 */
#define PAGESZ 4096

	usize length = 4096;
	int prot = PROT_READ; // memory protection; PROT_{EXEC,READ,WRITE,NONE}
	int flags = MAP_PRIVATE; // determines visibility
	off_t offset = 0;
	addr = mmap(NULL, length, prot, flags, fd, offset);

	addr = mmap(NULL, PAGESZ, PROT_READ, MAP_PRIVATE, fd, 0);

	munmap(addr, length);

	munmap(addr, PAGESZ);

		addr = mmap(NULL, length, prot, flags, fd, i << 12);

		addr = mmap(NULL, PAGESZ, PROT_READ, MAP_PRIVATE, fd, i << 12);

		munmap(addr, length);

		munmap(addr, PAGESZ);