Patent
1994-09-23
1996-11-05
Harvey, Jack B.
G06F 300
Patent
active
055727115
ABSTRACT:
A host data processing system which includes a plurality of input/output devices operates under the control of an enhanced version of the UNIX operating system. The host system includes an emulator which runs as an application process for executing user emulated system (ES) application programs. The emulator includes a number of emulated system executive service components operating in shared memory and an interpreter, an emulator monitor call unit (EMCU) and a number of server facilities operating in the host memory. The ES executive service command handler and file management components are extended to accommodate and to to allow creation and access to linked files within both host and emulated system files. The server facilities include mechanisms for performing trusted user level validation when a command invokes the access of such a linked file and access checking at file access time which ensures security relative to preventing both unauthorized user access and compromises in host file system data by improper use of linked files.
REFERENCES:
Notkin et al., "Heterogeneous Computing Environments: Report on the ACM SIGOPS Workshop on Accomodating Heterogeneity", Communications of the ACM, vol. 30, No. 2, pp. 132-140 Feb. 1987.
Bianchi Richard S.
Hirsch Thomas S.
Perry Ron B.
Bull HN Information Systems Inc.
Driscoll Faith F.
Harvey Jack B.
Lefkowitz Sumati
Solakian John S.
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