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.Dd Dec 3, 2014 .Dt EVENTFD 5 .Os .Sh NAME .Nm eventfd .Nd Linux-compatible user event notification facility .Sh SYNOPSIS n sys/eventfd.h .Sh DESCRIPTION .Nm is a Linux-borne facility for sending and receiving user events via a file descriptor. While the facility itself is somewhat dubious (it can be mimicked in an entirely portable way with a pipe), it is small and straightforward and this implementation is entirely compatible with its Linux antecedent; see .Xr eventfd 3C for details. .Sh SEE ALSO .Xr eventfd 3C