On Alpha and Integrity server systems, allows a process to map
    a section of its address space to a specified portion of a file.
    This service creates and maps a private disk file section.

    This service accepts 64-bit addresses.

    Format

      SYS$CRMPSC_FILE_64  region_id_64 ,file_offset_64 ,length_64

                          ,chan ,acmode ,flags ,return_va_64

                          ,return_length_64 [,fault_cluster

                          [,start_va_64]]

    C Prototype

      int sys$crmpsc_file_64  (struct _generic_64 *region_id_64,

                              unsigned __int64 file_offset_64,

                              unsigned __int64 length_64, unsigned

                              short int chan, unsigned int

                              acmode, unsigned int flags, void

                              *(*(return_va_64)), unsigned __int64

                              *return_length_64,...);