Epoll(Linux Programmer's Manual)
epoll-I/OeventnotificationfacilityTheepollAPIperformsasimilartasktopoll(2):monitoringmultiplefiledescriptorstoseeifI/Oispossibleonanyofthem.TheepollAPIcanbeusedeitherasanedge-triggeredoralevel-triggeredinterfaceandscaleswelltolargenumbersofwatchedfiledescriptors.
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