From 55d955902a7f78e3e7c9ddbc71a4a050d9d44810 Mon Sep 17 00:00:00 2001 From: Gerrit Renker Date: Wed, 10 Feb 2010 20:26:18 +0000 Subject: [PATCH] dccp: support for passing MSG_TRUNC DCCP is datagram-oriented but lacks UDP's support for MSG_TRUNC as defined in recvmsg(2)/recv(2). Hence the following 'Hello world\0' receiver len = recv(fd, buf, 10, MSG_PEEK | MSG_TRUNC); wrongly (always) returns 10, while in UDP it returns 12 as expected. This patch adds the missing MSG_TRUNC support to recvmsg(). Signed-off-by: Gerrit Renker Signed-off-by: David S. Miller --- net/dccp/proto.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/dccp/proto.c b/net/dccp/proto.c index 671cd1413d59..85ec1cb7fd41 100644 --- a/net/dccp/proto.c +++ b/net/dccp/proto.c @@ -835,6 +835,8 @@ int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, len = -EFAULT; break; } + if (flags & MSG_TRUNC) + len = skb->len; found_fin_ok: if (!(flags & MSG_PEEK)) sk_eat_skb(sk, skb, 0);