annoying Linux API peculiarity: there is no clean, race-free way to kill a specific process because killing uses a PID, which can be reused
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Still be a race if you obtained it via /proc/PID though. APIs using pid_t should be added with pid fd with a new way to spawn returning one.
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a wrapper for letting spawn return a pid fd should be writable in userspace pretty easily, without kernel modifications, I think
End of conversation
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