Abstract:

ACCESS_CHECK consists of a shareable image which contains a 
number of user-written system services. There is also a 
top-level program in C which exercises ONE of those system 
services.

The purpose of 4 of the system services is to determine access 
to (and existence of) a specified disk file. This is similar 
to the VAX C RTL function chk_access, but works in the presence 
of ACL's. It is also possible to check access on behalf of 
another user. The kind of access is specified either as a 
unix/VAX C 'mode' or as a VMS access mask. (The main difference 
is that VMS makes a difference between WRITE and DELETE access.)
The 5th system service retrieves the active rightslist (as 
opposed to the authorized rights) of the current process.

The top-level C program calls the access check system service 
on behalf of another user, with the access type specified as 
a unix mode. The result is passed to DCL $STATUS.