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Subject: Re: readv/writev
From: Robert Collins <rbcollins AT cygwin DOT com>
To: cygwin-developers AT cygwin DOT com
In-Reply-To: <20020826162921.M5475@cygbert.vinschen.de>
References: <00c501c2496e$39ae2720$6132bc3e AT BABEL>
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	<1030060087 DOT 8462 DOT 14 DOT camel AT lifelesswks> <20020824191035 DOT GB27153 AT redhat DOT com>
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	<20020826162921 DOT M5475 AT cygbert DOT vinschen DOT de>
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Date: 27 Aug 2002 00:38:09 +1000
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On Tue, 2002-08-27 at 00:29, Corinna Vinschen wrote:
> On Mon, Aug 26, 2002 at 03:20:00PM +0100, Conrad Scott wrote:
> > "Christopher Faylor" <cgf AT redhat DOT com> wrote:
> > > There shouldn't really be that much overhead to the current
> > method for
> > > handling text/binary reads, though.  It's just checking a bit
> > field.
> >=20
> > At the coal-face it ends up being a bit more messy than that.  For
> > example, the fhandler::read code checks the readahead buffers for
> > pending data but they will always be empty in binary-mode (AFAIK)
> > . In fact there's a page of code before the check for whether a
> > binary read is being done and only then does the code escape back
> > to the caller.  Since (AFAIK) you can't change the text/binary
> > mode of an fd once it's been opened (and thus the readahead
>=20
> You can.  setmode(fd, O_TEXT); or setmode(fd, O_BINARY);

Which is why I was suggesting stripping O_TEXT capability for raw FD's,
and making the TEXT translation only ever apply to the FILE * calls -
fprintf, fscanf, fread etc...

It allows all the fd level code to be much much simpler.

Rob



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