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dccp: support for passing MSG_TRUNC

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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 <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerrit Renker 2010-02-10 20:26:18 +00:00 committed by David S. Miller
parent cfc0861ba3
commit 55d955902a
1 changed files with 2 additions and 0 deletions
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2
net/dccp/proto.c
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@ -835,6 +835,8 @@ verify_sock_status:
len = -EFAULT; len = -EFAULT;
break; break;
} }
if (flags & MSG_TRUNC)
len = skb->len;
found_fin_ok: found_fin_ok:
if (!(flags & MSG_PEEK)) if (!(flags & MSG_PEEK))
sk_eat_skb(sk, skb, 0); sk_eat_skb(sk, skb, 0);