DECUS Heritage

Version: 4.01, October 1990
Submitted By: Erik Basilier, Motorola Inc.
Operating System: VAX/VMS V5.3
Source Language: C
Keywords: File Management, Security
Memory Requirements: 51KB
Notes: VAX C Runtime Library Reference Manual helpful. Subroutines are included.
Restrictions: It is necessary to merge MACRO-32 Source with DEC Source provided with VMS in SYS$EXAMPLES.

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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 four 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 fifth system service retrieves the active rights list (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.

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Last Update: Thu Jan 11 18:45:01 1996