On Sun, Oct 03, 1999 at 05:23:24PM -0700, Justin C. Walker wrote:
> > From: Darren Reed <darrenr@reed.wattle.id.au>
> > Date: 1999-10-03 06:38:03 -0700
> > To: tech-net@netbsd.org
> > Subject: m_copy - doesn't copy if M_EXT is set.
> > Delivered-to: tech-net@netbsd.org
> > X-Mailer: ELM [version 2.4ME+ PL37 (25)]
> >
> >
> > It would appear that the behaviour of m_copy()/m_copym() is changed, 
> > depending on whether or not M_EXT is set.  If M_EXT is set, then the 
> > buffer is *NOT* coppied, just another external reference is made and 
> > the appropriate counter incremented.  If it is unset, then a new
> > buffer is allocated (M_GET) and data copied from the orignal to the 
> > copy.
>    You're correct about the behavior of m_copy()/m_copym(), but not  
> about it's having changed.  This is old behavior.

From before 4.4BSD, even, I think. Does anybody have a 4.3BSD book handy?
	-is