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