Using dynamically-linked libraries to add side effects to operat

Details Using dynamically-linked libraries to add side effects to operat Using dynamically-linked libraries to add side effects to operat

1993-06-18

1996-11-05

Kulik, Paul V.

39518305, 395600, G06F 944, G06F 9455

Patent

active

055727093

ABSTRACT:
A backup file system which can be used without modification of application programs, the operating system, or the hardware. The backup file system is implemented by means of a dynamically-linkable replacement library and user-level processes on a primary computer system and a backup computer system. The dynamically-linkable replacement library has the same interfaces as a standard dynamically-linkable library of file operations. The functions in the replacement library perform the same file operations as their counterparts in the standard library; in addition, they send messages specifying the just-performed operation to a user-level process on the backup computer system. The user-level process executes the operation specified in the message on a backup file in the backup computer system. The files to be backed up are specified by identifying subtrees in the namespace of the primary file system; the subtrees make up a user-defined namespace. The backup file system is made fault tolerant by the use of monitor processes which monitor the backup computer system and the processes of the backup file system and deal with failures as required to keep the backup file system operating.

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