undo(2): undo the previous syscall
if computers were good they would have this
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There's also criu.org/Main_Page which is theoretically designed to do the unspeakable horror of persisting / migrating / duplicating processes across different Linux machines. In theory, you can even move them to a newer kernel versions. Can do some really horrible things.
It dumps a process into a directory via tons of hacks and then restores it. It can somehow restore existing TCP connections without dropping them, etc. You can even do that across computers.
The way it works under the hood is pretty scary. Victor Frankenstein would approve.
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