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
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