linux-kernel - Re: [Bug #14015] pty regressed again, breaking expect and gcc's testsuite

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Date:	Fri, 4 Sep 2009 22:12:34 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Mikael Pettersson <mikpe@...uu.se>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Alan Cox <alan@...ux.intel.com>, Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Subject: Re: [Bug #14015] pty regressed again, breaking expect and gcc's
 testsuite

> After writing the above, the voices in my head started clamoring about 
> this "space allocated" vs "bytes buffered" thing, which I was obviously 
> aware of, but hadn't thought about as an issue.
> 
> And you know what? The thing about "space allocated" vs "bytes buffered" 
> is that writing _one_ byte (the '\r') can cause a lot more than one byte 
> to be allocated for a buffer (we do minimum 256-byte buffers)

Doh yes thats an utterly dumb bug on my part - we do have to work on
chars.

100% agree with the diagnosis
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