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https://linux.die.net/man/2/epoll_ctl: EPOLLONESHOT (since Linux 2.6.2) Sets the one-shot behavior for the associated file descriptor. This means that after an event is pulled out with epoll_wait(2) the associated file descriptor is internally disabled and no other events will be reported by the epoll interface. The user must call epoll_ctl() with EPOLL_CTL_MOD to rearm the file descriptor with a new event mask. Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com> Change-Id: I6c0dc93e1cdae0e8cea5b487c7005de2da2c2ec3