Lucent Technologies Inc.

At+t Corp.

At&t Intellectual Property I, LP

David G Korn

Glenn Stephen Fowler

Yennun Huang

Stephen Charles North

Elefterios Koutsofios

Chung-Hwa Herman Rao

A method leverages the file format information used by a target application to convert a source dataset into an encoding usable by the target application without converting the source dataset before migration and without modifying the target application. The source data when on the source system has random portions of various data types that are encoded in a source encoding based on data type. The target application, which typically processes data encoded in a target encoding that is based on data type, is able to process the source data despite the source encoding using file format information and a modified compiler library.

Application conversion of source data

Techniques for porting operating systems of a first class whose representatives include operating systems implementing the POSIX standard to operating systems of a second class whose representatives include operating systems implementing the Win32 API. Processes belonging to operating systems of the first class are characterized by a single thread, parent-child relationships, and signal handlers that execute on the top of the stack; processes belonging to operating systems belonging to the second class have multiple threads, do not have parent-child relationships and do not necessarily execute their signal handlers at the top of the stack. Techniques are disclosed for implementing signal handling as required for operating systems of the first class and providing a signal to a parent process of the first class when one of its child processes terninates. Processes of the second class adapted for implementing processes of the first class are disclosed, as well as implementations of the POSIX fork and exec functions using those processes.

Porting POSIX-conforming operating systems to Win32 API-conforming operating systems

Techniques for porting operating systems of a first class whose representatives include operating systems implementing the POSIX standard to operating systems of a second class whose representatives include operating systems implementing the Win32 API. Processes belonging to operating systems of the first class are characterized by a single thread, parent-child relationships, and signal handlers that execute on the top of the stack; processes belonging to operating systems belonging to the second class have multiple threads, do not have parent-child relationships, and do not necessarily execute their signal handlers at the top of the stack. Techniques are disclosed for implementing signal handling as required for operating systems of the first class and providing a signal to a parent process of the first class when one of its child processes terminates. Processes of the second class adapted for implementing processes of the first class are disclosed, as well as implementations of the POSIX fork and exec functions using those processes.

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.

Using dynamically-linked libraries to add side effects to operations

Techniques for analyzing and controlling operation of a system of cooperating processes. A library of system calls used by the processes is replaced by a dynamically-linked library which performs the system calls and also sends messages indicating that the system calls have been performed. The messages are received by a display system which responds to the messages by making a graphical display showing the current state of the system of processes. The graphical display displays the system of processes as a tree. Nodes in the tree represent the processes in the system and resources such as files used by the processes; edges in the tree represent relationships between processes and other processes or resources. Users may control which system calls result in messages, may control the rate at which the display system responds to the messages, and may also control execution of the processes.

Growing community of inventors

New York, NY, United States of America

David G Korn