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| author | Davide Libenzi <davidel@xmailserver.org> | 2006-03-25 03:07:39 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-25 08:22:56 -0800 |
| commit | f348d70a324e15afc701a494f32ec468abb7d1eb (patch) | |
| tree | a4cb43429f7f08a6621c581bd99e4a03198e8c67 /net/unix | |
| parent | 501f2499b897ca4be68b1acc7a4bc8cf66f5fd24 (diff) | |
| download | blackbird-op-linux-f348d70a324e15afc701a494f32ec468abb7d1eb.tar.gz blackbird-op-linux-f348d70a324e15afc701a494f32ec468abb7d1eb.zip | |
[PATCH] POLLRDHUP/EPOLLRDHUP handling for half-closed devices notifications
Implement 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.
There is "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.
Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Michael Kerrisk <mtk-manpages@gmx.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'net/unix')
| -rw-r--r-- | net/unix/af_unix.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 2b4cc2eea5b3..d901465ce013 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -1878,6 +1878,8 @@ static unsigned int unix_poll(struct file * file, struct socket *sock, poll_tabl mask |= POLLERR; if (sk->sk_shutdown == SHUTDOWN_MASK) mask |= POLLHUP; + if (sk->sk_shutdown & RCV_SHUTDOWN) + mask |= POLLRDHUP; /* readable? */ if (!skb_queue_empty(&sk->sk_receive_queue) || |
