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From Alexei Kosut <>
Subject Re: I/O filter API
Date Wed, 27 Aug 1997 18:15:55 GMT
On Tue, 26 Aug 1997, Dean Gaudet wrote:

> The only problem with layering, regardless of what we use ... is keeping
> the memory to memory copies to a minimum.  It doesn't bother me a whole
> lot if the dynamic/filtered paths involve copies (this is almost by
> definition) ... but I want to be sure the static path remains copyless. 
> This means we will probably want a writev() equivalent in the API since
> writev() is instrumental in pushing copies into the kernel (where they
> typically have to happen anyhow). 

Right. The API and BUFF-based implementation that Ed and I have been
talking about (I'll post a copy later today) does exactly what BUFF does
today, if there are no filters installed on the stream.

We want to keep you happy, Dean :)

-- Alexei Kosut <>

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