From: Neil Brown <neilb@suse.de>
Subject: Re: stdio and nfs-utils
Date: Thu, 26 Jul 2007 14:10:15 +1000
Message-ID: <18088.7847.592861.408080@notabene.brown>
References: <20070725223723.GH7943@fieldses.org>
	<20070726000700.GK7943@fieldses.org>
	<18088.3581.647761.879253@notabene.brown>
	<20070726031755.GB19901@fieldses.org>
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Cc: nfs@lists.sourceforge.net
To: "J. Bruce Fields" <bfields@fieldses.org>
In-Reply-To: message from J. Bruce Fields on Wednesday July 25
Sender: nfs-bounces@lists.sourceforge.net
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On Wednesday July 25, bfields@fieldses.org wrote:
> On Thu, Jul 26, 2007 at 12:59:09PM +1000, Neil Brown wrote:
> > While I can see the value it avoiding the stdio code, I can also see
> > some in hanging on to it, so I would first like to see if we can make
> > the current code work with just minor modifications.
> > 
> > Could you check how calling 'clearerr' interacts with this code on the
> > two different systems?
> 
> I tried inserting a clearerr into the loop:
> 
> 	fprintf();
> 	fflush();
> 	clearerr();
> 
> No change in behavior.

Hmmm.... (reads man page)...

#include <stdio_ext.h>

...

	__fpurge(f)

seems to do the trick.

> 
> I see the advantage to doing just one step at a time--so if we can
> figure out a minimal fix for now, fine.  But surely we've got to replace
> the stdio stuff at some point.  We need precise control over the writes,
> so the buffering can only get in the way.

But we want to build a line up from multiple words, and so we need
buffering for that.
If we toss stdio, we will need to allocate a buffer, keep track of the
end point, and append to the buffer in various places.  It feels like
reinventing the wheel.

NeilBrown

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