Subject: Re: m_copy - doesn't copy if M_EXT is set.
To: Justin C. Walker <>
From: Ignatios Souvatzis <>
List: tech-net
Date: 10/04/1999 22:26:55
On Mon, Oct 04, 1999 at 01:14:33PM -0700, Justin C. Walker wrote:
> It's in the 4.3 BSD book, and I'm pretty sure it's been that way  
> since clusters were introduced.  The idea was to avoid a lot of  
> copying.  It just has that one nasty little side-effect (it doesn't  
> really produce a copy).

Yes... the idea is that you only copy stuff if you need the original + 
the original with some bytes trimmed off or appended to the start or end.

btw, m_split just increases cluster reference counts, too.