Completing the pidfd API

Over the last few kernel releases, the kernel has gained the concept of a "pidfd" — a file descriptor that represents a process. What started as a way of sending signals to processes without race conditions has evolved into a more complete process-management interface. Now one of the last pieces is being put into place: the ability to wait for processes using pidfds. But, naturally, that API has had to go through some revisions first.

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