UpStare is a dynamic software updating system (compiler, runtime, and patch-generator) for multi-threaded userspace applications. It allows semi-automatic updates to programs that could not be updated with existing approaches, or could be updated with a possibly indefinite delay between the time an update is requested and the time the update is applied. The approach can replace functions active on the stack by applying stack reconstruction, which can update program state and program code immediately in a single step. This obviates the need to rely on statically determined safe update points, which might not exist, and can update server-side code without closing client connections.
License: Free for non-commercial use
Changes:
This release considerably improves the ability of the patch generator to automatically produce stack transformers and incorporate user-defined stack transformers. It also implements support for blocking system calls in a much more efficient way.
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01-15-2009
