Map maps an entire file into memory.

MapRegion maps part of a file into memory.

If the ANON flag is set, the mapped memory will not be backed by a file.

COPY maps the memory as copy-on-write.

If EXEC is set, the mapped memory is marked as executable.

RDONLY maps the memory read-only.

RDWR maps the memory as read-write.

MMap represents a file mapped into memory.