Commit 55d95590 authored Feb 10, 2010 by Gerrit Renker Committed by David S. Miller Feb 12, 2010

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 <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent cfc0861b

net/dccp/proto.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -835,6 +835,8 @@ verify_sock_status:
		len = -EFAULT;
		break;
		}
		if (flags & MSG_TRUNC)
		len = skb->len;
		found_fin_ok:
		if (!(flags & MSG_PEEK))
		sk_eat_skb(sk, skb, 0);

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