diff options
| author | Davide Libenzi <davidel@xmailserver.org> | 2006-03-25 12:07:39 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-25 17:22:56 +0100 |
| commit | f348d70a324e15afc701a494f32ec468abb7d1eb (patch) | |
| tree | a4cb43429f7f08a6621c581bd99e4a03198e8c67 /net/core | |
| parent | [PATCH] IRQ: prevent enabling of previously disabled interrupt (diff) | |
| download | linux-f348d70a324e15afc701a494f32ec468abb7d1eb.tar.xz 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/core')
| -rw-r--r-- | net/core/datagram.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/core/datagram.c b/net/core/datagram.c index b8ce6bf81188..aecddcc30401 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -500,6 +500,8 @@ unsigned int datagram_poll(struct file *file, struct socket *sock, /* exceptional events? */ if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) mask |= POLLERR; + if (sk->sk_shutdown & RCV_SHUTDOWN) + mask |= POLLRDHUP; if (sk->sk_shutdown == SHUTDOWN_MASK) mask |= POLLHUP; |