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   epoll    ( 7 )

средство уведомления о событиях ввода / вывода (I/O event notification facility)
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Примечание (Note)

The set of file descriptors that is being monitored via an epoll
       file descriptor can be viewed via the entry for the epoll file
       descriptor in the process's /proc/[pid]/fdinfo directory.  See
       proc(5) for further details.


       The kcmp(2) KCMP_EPOLL_TFD operation can be used to test whether
       a file descriptor is present in an epoll instance.