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authorDavide Libenzi <davidel@xmailserver.org>2006-03-25 03:07:39 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-25 08:22:56 -0800
commitf348d70a324e15afc701a494f32ec468abb7d1eb (patch)
treea4cb43429f7f08a6621c581bd99e4a03198e8c67 /include/asm-i386
parent501f2499b897ca4be68b1acc7a4bc8cf66f5fd24 (diff)
[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 'include/asm-i386')
-rw-r--r--include/asm-i386/poll.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-i386/poll.h b/include/asm-i386/poll.h
index aecc80a15d3..2cd4929abd4 100644
--- a/include/asm-i386/poll.h
+++ b/include/asm-i386/poll.h
@@ -16,6 +16,7 @@
#define POLLWRBAND 0x0200
#define POLLMSG 0x0400
#define POLLREMOVE 0x1000
+#define POLLRDHUP 0x2000
struct pollfd {
int fd;