On Thu, 9 Sep 2010 17:49:18 +0000 (UTC) Matthew D Fleming <m...@freebsd.org> wrote:
> Author: mdf > Date: Thu Sep 9 17:49:18 2010 > New Revision: 212367 > URL: http://svn.freebsd.org/changeset/base/212367 > > Log: > Add drain functionality to sbufs. The drain is a function that is > called when the sbuf internal buffer is filled. For kernel sbufs > with a drain, the internal buffer will never be expanded. For > userland sbufs with a drain, the internal buffer may still be > expanded by sbuf_[v]printf(3). > > Sbufs now have three basic uses: > 1) static string manipulation. Overflow is marked. > 2) dynamic string manipulation. Overflow triggers string growth. > 3) drained string manipulation. Overflow triggers draining. > > In all cases the manipulation is 'safe' in that overflow is > detected and managed. > > Reviewed by: phk (the previous version) > This one is responsible for hangs on my amd64 test box. -- Alexander Kabaev
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