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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 /fs/eventpoll.c
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 'fs/eventpoll.c')
-rw-r--r--fs/eventpoll.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 1c2b16fda13a..a0f682cdd03e 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -599,7 +599,7 @@ sys_epoll_ctl(int epfd, int op, int fd, struct epoll_event __user *event)
switch (op) {
case EPOLL_CTL_ADD:
if (!epi) {
- epds.events |= POLLERR | POLLHUP;
+ epds.events |= POLLERR | POLLHUP | POLLRDHUP;
error = ep_insert(ep, &epds, tfile, fd);
} else
@@ -613,7 +613,7 @@ sys_epoll_ctl(int epfd, int op, int fd, struct epoll_event __user *event)
break;
case EPOLL_CTL_MOD:
if (epi) {
- epds.events |= POLLERR | POLLHUP;
+ epds.events |= POLLERR | POLLHUP | POLLRDHUP;
error = ep_modify(ep, epi, &epds);
} else
error = -ENOENT;