2.Preserving A CDs Device ACDs are not permanen t objects and must be rede￿ned every time the system is rebooted. The easiest w ays to do this are to put ALTSEC commands into the SYSTART ￿le, either directly or in a command ￿le.

File ACDs are permanent objects and surviv e a reboot. When storing ￿les to tape, FCOPY and STORE store the ￿les' ACDs unless you specify otherwise.

3.Listing ACDs

To get information about A CDs interactively, use the SHOWDEV command for devices, and the LISTFILE command for ￿les. To get information about A CDs programmatically , use the HPACDINFO or HPACDPUT intrinsics.

Any user can ￿nd out whether an A CD exists for a particular device or ￿le, but only an owner, or user gran ted RACD (read ACD) access, can get a listing of the A CD contents.

4.Copying ACDs

To copy an ACD from one ￿le to another, use the COPYACD parameter of the ALTSEC command. Only the o wner or user gran ted RACD (read ACD) access can copy an ACD.

5.Modifying ACDs

To change an ACD, use the ALTSEC command or the HPACDPUT intrinsic. Only an o wner can alter an ACD.

6.Deleting ACDs

To delete an ACD, use the ALTSEC command or the HPACDPUT intrinsic. Only an o wner can delete an ACD.

7.Migrating A CDs

Both MPE V/E and MPE/iX support the use of A CDs. MPE/iX, ho wever, allows more user-mode pairs than MPE V/E.

Note

Device ACDs shold not be migrated because they are tied to their system's

 

con￿guration.

 

 

Move ￿le ACDs between MPE V and MPE/iX by using the STORE and RESTORE commands, where COPYACD is the default.

Note

You must have authorization to use the COPYACD parameter of the STORE

 

and RESTORE commands. If you are not an owner of the ￿le and do not ha ve

 

RACD permission, y ou will get an error.

 

 

Changing Disc File Security Provisions

The security provisions for the accoun t and group levels are managed only b y users with System Manager or Accoun t Manager capabilities, respectiv ely. However, you can change the security provisions for any disc ￿le you have created by using the :ALTSEC command. This does not a￿ect any account-level or group-level provisions that ma y cover the ￿le, and it does not a￿ect the securit y provided by a lockword. For detailed information on this topic, refer to Accessing Files Pr ogrammer's Guide (32650-90017).

File System 6-43