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Re: [Xen-devel] evtchn sanity check

from [Keir Fraser]

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To:	"King, Steven R" <steven.r.king@xxxxxxxxx>
Subject:	Re: [Xen-devel] evtchn sanity check
From:	Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date:	Wed, 19 Oct 2005 07:06:34 +0100
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This is all correct. The only things read/written from/to the deviceare 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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