Regarding about iovec

["Jonathan Khoo" <jonath-k@is.aist-nara.ac.jp>]

Hi guys,

I have some queries about iovec. Please take a look at the following
codes:

size and len are both 52. There are 2 iov in msg_iov. 
The 1st is 16 bytes and the 2nd is 36 bytes.

memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, len);
(user->kernel)

skb_copy_datagram_iovec(skb, 0, msg->iov, 52);
(kernel->user)

The funny thing is that although I did not modify skb, the returning
msg->iov gives me a zeroed structure.
Does anyone know where did I go wrong? I actually tested this by placing
the 2nd statement directly after the 1st memcpy.
In fact, I rip the 2 lines off netlink_sendmsg and netlink_recvmsg.

Thanks for any help in advance! 
Cheers,
Jonathan


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