linux-kernel - Re: [PATCH] kdesu broken

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Message-ID: <20090728180900.54b2f0b7@lxorguk.ukuu.org.uk>
Date:	Tue, 28 Jul 2009 18:09:00 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Ray Lee <ray-lk@...rabbit.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] kdesu broken

> Put another way: our pty code is simply _buggy_ if it returns EINTR when 
> there is actually data pending on a pty.

Good job it doesn't do that then - although be careful what "data
pending" means. If the buffer contains "wombat" and you are in ICANON
mode then there is no data pending, and poll() likewise will say there is
no data pending. Only when newline is hit do you have data pending (which
is why test t3 is buggy)

Alan
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