VMS Help CC, Run-time functions, mmap  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Maps a file system object into virtual memory.

  Syntax:

        #include <types.h>
        #include <mman.h>

        void mmap (void *addr,
                   size_t len,
                   int prot,
                   int flags,
                   int filedes,
                   off_t off);  [xopen/posix-1]
                   size_t len,
                   int prot,
                   int flags,
                   int filedes,
                   off_t off...);  [Compaq C extension]