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So the idea is that you have one syscall that creates a new task, and that task can choose whether to share an read-write address space or have private semantics with copy-on-write.
It’s elegant, but the issue is that POSIX wasn’t designed with that implementation in mind, so you have to jump through hoops to implement POSIX. e.g. “current user” is per-*task* in Linux but per-*process* in POSIX, so glibc has to do horrible things to make it work.
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