Lennart Poettering
495e75ed5c
This makes sure unit_watch_pid() and unit_unwatch_pid() will track processes by pidfd if supported. Also ports over some related code. Should not really change behaviour. Note that this does *not* add support waiting for POLLIN on the pidfds as additional exit notification. This is left for a later commit (this commit is already large enough), in particular as that would add new logic and not just convert existing logic.
System and Service Manager
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