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epoll.7: Document EPOLLWAKEUP
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -173,6 +173,35 @@ it is the caller's responsibility to rearm the file descriptor using
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.BR epoll_ctl (2)
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.BR epoll_ctl (2)
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with
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with
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.BR EPOLL_CTL_MOD .
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.BR EPOLL_CTL_MOD .
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.SS Interaction with autosleep
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If the system is in
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.B autosleep
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mode via
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.I /sys/power/autosleep
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and an event happens which wakes the device from sleep, the device
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driver will only keep the device awake until that event is queued. To
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keep the device awake until the event has been processed it is
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necessary to use
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.B epoll
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and the
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.B EPOLLWAKEUP
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flag.
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When this flag is set in the
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.B events
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field for a
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.I struct epoll_event
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then system will be kept awake from the moment the event is queued,
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through the
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.IR epoll_wait (2)
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call which returns the event until the subsequent
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.IR epoll_wait (2)
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call. If the event should keep the system awake beyond that time,
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the a separate
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.I wake_lock
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should be taken before the second
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.IR epoll_wait (2)
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call.
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.SS /proc interfaces
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.SS /proc interfaces
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The following interfaces can be used to limit the amount of
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The following interfaces can be used to limit the amount of
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kernel memory consumed by epoll:
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kernel memory consumed by epoll:
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