Re: [patch] POLLRDHUP/EPOLLRDHUP handling for half-closed devicesnotifications ...

[Davide Libenzi]

On Tue, 7 Mar 2006, Davide Libenzi wrote:

> The attached patch against 2.6.16-rc5 implements the half-closed devices 
> notifiation, by adding a new POLLRDHUP (and its alias EPOLLRDHUP) bit to the 
> existing poll/select sets. Since the existing POLLHUP handling, that does not 
> report correctly half-closed devices, was feared to be changed, this 
> implementation leaves the current POLLHUP reporting unchanged and simply add 
> a new bit that is set in the few places where it makes sense.
> The same thing was discussed and conceptually agreed quite some time ago:
>
> http://lkml.org/lkml/2003/7/12/116
>
> Since this new event bit is added to the existing Linux poll infrastruture, 
> even the existing poll/select system calls will be able to use it. As far as 
> the existing POLLHUP handling, the patch leaves it as is.
> The pollrdhup-2.6.16.rc5-0.10.diff defines the POLLRDHUP for all the existing 
> archs and sets the bit in the six relevant files.
> The other attached diff is the simple change required to sys/epoll.h to add 
> the EPOLLRDHUP definition.

I just added a stupid program to test POLLRDHUP delivery here:

http://www.xmailserver.org/pollrdhup-test.c

It tests poll(2), but since the delivery is same epoll(2) will work equally.



- Davide


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/