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epoll.7: Document EPOLLWAKEUP 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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NeilBrown 2014-07-07 07:32:49 +02:00 committed by Michael Kerrisk
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@ -173,6 +173,35 @@ it is the caller's responsibility to rearm the file descriptor using
.BR epoll_ctl (2)
with
.BR EPOLL_CTL_MOD .
.SS Interaction with autosleep
If the system is in
.B autosleep
mode via
.I /sys/power/autosleep
and an event happens which wakes the device from sleep, the device
driver will only keep the device awake until that event is queued. To
keep the device awake until the event has been processed it is
necessary to use
.B epoll
and the
.B EPOLLWAKEUP
flag.
When this flag is set in the
.B events
field for a
.I struct epoll_event
then system will be kept awake from the moment the event is queued,
through the
.IR epoll_wait (2)
call which returns the event until the subsequent
.IR epoll_wait (2)
call. If the event should keep the system awake beyond that time,
the a separate
.I wake_lock
should be taken before the second
.IR epoll_wait (2)
call.
.SS /proc interfaces
The following interfaces can be used to limit the amount of
kernel memory consumed by epoll: