This is a POSIX-compliant implementation of the mmap() library, built on top of JOS, a exokernel-style operating system.
mmap is a method of memory-mapped I/O, which allows user programs to map a memory object, such a partial or complete file, to their environment's virtual address space. Pages are mapped lazily and are retrieved on-demand.
void *mmap(void *addr, size_t len, int prot, int flags, int fd, off_t off);int munmap(void *addr, size_t len);