efd3be9de1
Previously, when a process outputs something and exit just after epoll_wait() but before process_child(), then the IO event is ignored even if the IO event has higher priority. See #18190. This can be solved by checking epoll event again after process_child(). However, there exists a possibility that another process outputs and exits just after process_child() but before the second epoll_wait(). When the IO event has lower priority than the child event, still IO event is processed. So, this makes new epoll events and child events are checked in a loop until no new event is detected. To prevent an infinite loop, the number of maximum trial is set to 10. Fixes #18190.
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