diff options
| author | Soheil Hassas Yeganeh <soheil@google.com> | 2019-03-06 13:01:36 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-03-06 11:00:50 -0800 |
| commit | 6466e715651f9f358e60c5ea4880e4731325827f (patch) | |
| tree | b7becb9ea1b8fd50abbca27ddd36c0b379485b0a /net | |
| parent | 6caabe7f197d3466d238f70915d65301f1716626 (diff) | |
tcp: do not report TCP_CM_INQ of 0 for closed connections
Returning 0 as inq to userspace indicates there is no more data to
read, and the application needs to wait for EPOLLIN. For a connection
that has received FIN from the remote peer, however, the application
must continue reading until getting EOF (return value of 0
from tcp_recvmsg) or an error, if edge-triggered epoll (EPOLLET) is
being used. Otherwise, the application will never receive a new
EPOLLIN, since there is no epoll edge after the FIN.
Return 1 when there is no data left on the queue but the
connection has received FIN, so that the applications continue
reading.
Fixes: b75eba76d3d72 (tcp: send in-queue bytes in cmsg upon read)
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index dbb08140cdc9..6baa6dc1b13b 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -1937,6 +1937,11 @@ static int tcp_inq_hint(struct sock *sk) inq = tp->rcv_nxt - tp->copied_seq; release_sock(sk); } + /* After receiving a FIN, tell the user-space to continue reading + * by returning a non-zero inq. + */ + if (inq == 0 && sock_flag(sk, SOCK_DONE)) + inq = 1; return inq; } |