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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 /net
parent501f2499b897ca4be68b1acc7a4bc8cf66f5fd24 (diff)
downloadlinux-sh-f348d70a324e15afc701a494f32ec468abb7d1eb.tar.gz
[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')
-rw-r--r--net/bluetooth/af_bluetooth.c3
-rw-r--r--net/core/datagram.c2
-rw-r--r--net/dccp/proto.c2
-rw-r--r--net/ipv4/tcp.c2
-rw-r--r--net/sctp/socket.c2
-rw-r--r--net/unix/af_unix.c2
6 files changed, 11 insertions, 2 deletions
diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index fb031fe9be9e..469eda0f0dfd 100644
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -238,6 +238,9 @@ unsigned int bt_sock_poll(struct file * file, struct socket *sock, poll_table *w
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;
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;
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index d4b293e16283..1ff7328b0e17 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -350,7 +350,7 @@ unsigned int dccp_poll(struct file *file, struct socket *sock,
if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED)
mask |= POLLHUP;
if (sk->sk_shutdown & RCV_SHUTDOWN)
- mask |= POLLIN | POLLRDNORM;
+ mask |= POLLIN | POLLRDNORM | POLLRDHUP;
/* Connected? */
if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) {
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)
if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == TCP_CLOSE)
mask |= POLLHUP;
if (sk->sk_shutdown & RCV_SHUTDOWN)
- mask |= POLLIN | POLLRDNORM;
+ mask |= POLLIN | POLLRDNORM | POLLRDHUP;
/* Connected? */
if ((1 << sk->sk_state) & ~(TCPF_SYN_SENT | TCPF_SYN_RECV)) {
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 0ea947eb6813..b6e4b89539b3 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4894,6 +4894,8 @@ unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
/* Is there any 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;
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) ||