[core] Fix _timerfd_check using wrong syscall to detect timer expiration. Add unit-tests. - #3129
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…ion. Add unit-tests. `timerfd_gettime()` returns the time remaining until the next periodic tick, regardless of how many previous ticks have already fired and remain unread. Replace with `poll()` which correctly checks for pending unread expirations.
andywolk
approved these changes
Aug 21, 2026
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timerfd_gettime()returns the time remaining until the next periodic tick, regardless of how many previous ticks have already fired and remain unread. Replace withpoll()which correctly checks for pending unread expirations.