On Alpha and Integrity server systems, creates a permanent global
    disk file section to which processes can map.

    This service accepts 64-bit addresses.

    Format

      SYS$CREATE_GFILE  gs_name_64 ,ident_64 ,file_offset_64

                        ,length_64 ,chan ,acmode ,flags

                        ,return_length_64 [,fault_cluster]

    C Prototype

      int sys$create_gfile  (void *gs_nam_64, struct _secid

                            *ident_64, unsigned __int64

                            file_offset_64, unsigned __int64

                            length_64, unsigned short int chan,

                            unsigned int acmode, unsigned int flags,

                            unsigned __int64 *return_length_64,...);