> On Fri, 10 Jan 2003, Sam Leffler wrote:
> > unless the mbufs are specifically tagged as such. I'm not clear on
exactly
> > what sb_ctl is supposed to count; the comment in the cvs log is unclear:
> >
> > "Track the number of non-data chararacters stored in socket buffers so
that
> > the data value returned by kevent()'s EVFILT_READ filter on non-TCP
> > sockets accurately reflects the amount of data that can be read from the
> > sockets by applications."
> >
> > What are "non-data characters"?
>
> A very zen question. :) In this case, It probably means bytes carried in
> an mbuf with a type other than MT_DATA.
The point was that it's not clear to me that you can infer this data from
the inverse set of (MT_DATA +whatever). Garrett suggested MT_SONAME data as
an example of non-data characters. I no longer know exactly what the
complete set of mbuf types is that comprise "non-data characters".
Sam
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