Re: [Xen-devel] evtchn sanity check

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

This is all correct. The only things read/written from/to the device 
are 16-bit port numbers.
 -- Keir

On 18 Oct 2005, at 22:30, King, Steven R wrote:

> Would appreciate a sanity check on my understanding:
>
> When doing a read() from an interdomain event channel file descriptor
> (/dev/xen/evtchn), the values read are 16-bit port numbers on which
> there is an event.  Is there ever anything else that is read() from the
> event channel?
>
> When doing a write() on an interdomain event channel file descriptor,
> the data written are 16-bit port values for which events should be
> enabled (or generated?).  Is there ever anything else that is write()'n
> to an event channel?
>
> After doing a notify() IOCTL on an interdomain event channel, a read()
> on the remote file descriptor returns the 16-bit port number that
> received the notify.
>
> Thanks for the time,
> -steve
>
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