On Fri, 18 Jan 2002, Skye Poier wrote:
> What are the rules around mbuf chain construction?
> (I've read man mbuf, doesnt go into much detail)
>
> In particular, I'm assuming:
> - all mbufs must be same type
> - the head mbuf must have M_PKTHDR set
> - the head mbuf.m_pkthdr.len must be the len of the entire chain
> Anything to add?
>
> My confusion is around splitting/concatenating -
>
> When splitting an mbuf chain, the two resultant chains must be as above
> (heads have M_PKTHDR and mbuf.m_pkthdr.len set) right?
That depends on why yuo need to split them.
>
> When concatenating chains, what do you do with the M_PKTHDR that is now
> in the middle of the chain? m_cat doesn't seem very sophisticated in
> this regard. And of course update head mbuf.m_pkthdr.len
>
> Thanks
> Skye
>
>
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