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authorDavide Libenzi <davidel@xmailserver.org>2006-03-25 06:07:39 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-25 11:22:56 -0500
commitf348d70a324e15afc701a494f32ec468abb7d1eb (patch)
treea4cb43429f7f08a6621c581bd99e4a03198e8c67 /net/ipv4/tcp.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 'net/ipv4/tcp.c')
-rw-r--r--net/ipv4/tcp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 4b0272c92d66..19ea5c0b094b 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -365,7 +365,7 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
365 if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == TCP_CLOSE) 365 if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == TCP_CLOSE)
366 mask |= POLLHUP; 366 mask |= POLLHUP;
367 if (sk->sk_shutdown & RCV_SHUTDOWN) 367 if (sk->sk_shutdown & RCV_SHUTDOWN)
368 mask |= POLLIN | POLLRDNORM; 368 mask |= POLLIN | POLLRDNORM | POLLRDHUP;
369 369
370 /* Connected? */ 370 /* Connected? */
371 if ((1 << sk->sk_state) & ~(TCPF_SYN_SENT | TCPF_SYN_RECV)) { 371 if ((1 << sk->sk_state) & ~(TCPF_SYN_SENT | TCPF_SYN_RECV)) {