XABPRO

   The protection XAB (XABPRO) specifies the ownership,
   accessibility, and protection for a file. Although an application
   program typically uses a XABPRO as input to establish file
   protection when it creates a file, it can also use the XABPRO
   to change file protection when it closes a file. The program that
   opened the file can change file protection when it closes the
   file only if it accessed the file to make modifications and has
   control access.

   The following table lists the symbolic offset, the size in bytes,
   FDL equivalent, and a brief description of each field.

   Offset         FDL Equivalent    Description

   XAB$L_ACLBUF   None              Address of buffer that contains
                                    ACL
   XAB$L_ACLCTX   None              ACL positioning context
   XAB$W_ACLLEN   None              Receives the length of an
                                    ACL during an Open or Display
                                    service
   XAB$W_ACLSIZ   None              Length of buffer containing
                                    binary ACEs
   XAB$L_ACLSTS   None              System error status for ACL
                                    processing
   XAB$B_BLN      None              Block length
   XAB$B_COD      None              Type code
   XAB$W_GRP      FILE OWNER        Group number of file owner
   XAB$W_MBM      FILE OWNER        Member number of file owner
   XAB$B_MTACC    FILE MT_          Magnetic tape accessibility
                  PROTECTION
   XAB$L_NXT      None              Next XAB address
   XAB$W_PRO      FILE PROTECTION   File protection; contains
                                    four separate fields denoting
                                    protection for system, owner,
                                    group, and world
   XAB$B_PROT_    None              File protection options
   OPT
   XAB$L_UIC      FILE OWNER        User identification code;
                                    contains both the group and
                                    member fields