Method and apparatus for providing an aggregate view of enumerated system resources from various isolation layers

• US 8,171,479 B2
• Filed: 09/30/2004
• Issued: 05/01/2012
• Est. Priority Date: 09/30/2004
• Status: Active Grant

• Current Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Original Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Inventors: Laborczfalvi, Lee George, Roychoudhry, Anil, Borzycki, Andrew Gerard, Muir, Jeffrey Dale, Chin, Huai Chiun, Mazzaferri, Richard James
• Primary Examiner(s): Anya, Charles E
• Application Number:
  US10/711,736
• Publication Number:
  US 20060070030A1
• Time in Patent Office: 2,770 Days
• Field of Search: 718/104, 711/168, 707/205, 713/1, 713/100, 713/165, 719/321
• US Class Current: 718/104
• CPC Class Codes: G06F 8/61 Installation
• CPC Class Codes: G06F 9/52 Program synchronisation; Mutual exclusion, e.g. by means of semaphores

Abstract

A method for presenting an aggregate view of native resources includes the step of enumerating a plurality of system-scoped native resources provided by a system scope. A plurality of application-scoped native resources provided by an application isolation scope are enumerated, some of which correspond to some of the plurality of system-scoped resources. For one of the plurality of system-scoped resources, the existence of a corresponding one of the plurality of application-scoped resources is determined and the corresponding one of the plurality of application-scoped resources is included in an aggregate view of native resources.

Claims

1. A method for presenting an aggregate view of native resources, the method comprising:

(a) enumerating a plurality of system-scoped native resources provided by a system layer;

(b) enumerating, by an isolation environment comprising a user isolation layer and an application isolation layer, a plurality of application-scoped native resources provided by the application isolation layer, some of the plurality of application-scoped resources corresponding to some of the plurality of system-scoped resources;

(c) determining, for a system-scoped resource of the plurality of system-scoped resources, that a corresponding application-scoped resource of the plurality of application-scoped resources has a positive existence;

(d) merging the corresponding application scoped resource with the system-scoped resource in an aggregate view of native resources;

(e) enumerating a plurality of user-scoped native resources provided by the user isolation layer, some of the plurality of user-scoped resources corresponding to some of the plurality of system-scoped resources;

(f) determining, for the application-scoped resource of the plurality of application-scoped resources, that a corresponding user-scoped resource of the plurality of user-scoped resources has a positive existence; and

(g) merging the corresponding user-scoped resource with the application-scoped resource in the aggregate view of native resources.

2. The method of claim 1 wherein step (c) comprises determining, for the system-scoped resource of the plurality of system-scoped resources, that a corresponding application-scoped resource of the plurality of application-scoped resources does not exist.

3. The method of claim 2 wherein step (d) comprises including the system-scoped resource in the aggregate view of native resources.

4. The method of claim 1 wherein step (f) comprises determining, for the application-scoped resource of the plurality of application-scoped resources, that the corresponding user-scoped resource of the plurality of user-scoped resources does not exist.

5. The method of claim 4 wherein step (g) comprises including the application-scoped resource in the aggregate view of native resources.

6. The method of claim 1 wherein step (c) comprises determining, for the system-scoped resource of the plurality of system-scoped resources, that the corresponding application-scoped resource of the plurality of application-scoped resources indicates the system-scoped resource is deleted.

7. The method of claim 6 wherein step (d) comprises removing the system-scoped resource from the aggregate view of native resources.

8. The method of claim 1 wherein step (f) comprises determining, for the application-scoped resource of the plurality of application-scoped resources, that the corresponding user-scoped resource of the plurality of user-scoped resources indicates the resource is deleted.

9. The method of claim 8 wherein step (g) comprises removing the system-scoped resource from the aggregate view of native resources.

10. The method of claim 1 further comprising the step of intercepting, by a file system driver, a mini-driver, a user mode hooking mechanism, or a kernel mode hooking mechanism, a request to enumerate a file system comprising system-scoped resources.

11. The method of claim 1 further comprising the step of intercepting a request to enumerate a plurality of registry entries.

12. An apparatus for presenting an aggregate view of native resources comprising:

means for enumerating a plurality of system-scoped native resources provided by a system layer;

means for enumerating, by an isolation environment comprising a user isolation layer and an application isolation layer, a plurality of application-scoped native resources provided by the application isolation layer, some of the plurality of application-scoped resources corresponding to some of the plurality of system-scoped resources;

means for determining, for a system-scoped resource of the plurality of system-scoped resources, that a corresponding application-scoped resource of the plurality of application-scoped resources has a positive existence;

means for merging the corresponding application-scoped resource with the system-scoped resource in an aggregate view of native resources;

means for enumerating a plurality of user-scoped native resources provided by the user isolation layer, some of the plurality of user-scoped resources corresponding to some of the plurality of application-scoped resources;

means for determining, for an application-scoped resource of the plurality of application-scoped resources, that a corresponding user-scoped resource of the plurality of user-scoped resources has a positive existence; and

means for merging the corresponding user-scoped resource with the application-scoped resource in the aggregate view of native resources.

13. The apparatus of claim 12 wherein the means for determining determines, for the system-scoped resource of the plurality of system-scoped resources, that the corresponding application-scoped resource of the plurality of application-scoped resources does not exist.

14. The apparatus of claim 13 wherein the means for replacing includes the system-scoped resource in the aggregate view of native resources instead of the application-scoped resource.

15. The apparatus of claim 12 wherein the means for determining determines that the user-scoped resource corresponding to the application-scoped resource does not exist and including the application-scoped resource in the aggregate view of native resources.

16. The apparatus of claim 13 wherein the means for determining determines the application-scoped resource is deleted and removing the system-scoped resource from the aggregate view of native resources.

17. The apparatus of claim 12 wherein the means for determining determines the user-scoped resource is deleted and removing the system-scoped resource from the aggregate view of native resources.

18. An article of manufacture comprising a non-transitory computer usable medium having computer readable program code means embodied therein for presenting an aggregate view of native resources, the computer readable program code in said article of manufacture comprising:

computer readable program code means for enumerating a plurality of system-scoped native resources provided by a system layer;

computer readable program code means for enumerating, by an isolation environment comprising a user isolation layer and an application isolation layer, a plurality of application-scoped native resources provided by the application isolation layer, some of the plurality of application-scoped resources corresponding to some of the plurality of system-scoped resources;

computer readable program code means for determining, for a system-scoped resource of the plurality of system-scoped resources, that a corresponding application-scoped resource of the plurality of application-scoped resources has a positive existence;

computer readable program code means for merging the corresponding application-scoped resource with the system-scoped resource in an aggregate view of native resources;

computer readable program code means for enumerating a plurality of user-scoped native resources provided by the user isolation layer, some of the plurality of user-scoped resources corresponding to some of the plurality of application-scoped resources;

computer readable program code means for determining, for an application-scoped resource of the plurality of application-scoped resources, that a corresponding user-scoped resource of the plurality of user-scoped resources has a positive existence; and

computer readable program code means for merging the corresponding user-scoped resource with the application-scoped resource in the aggregate view of native resources.