linux-kernel - Re: v3.10 breaks T.tcflush (Was: tty: disassociate

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Message-ID: <52437AA2.5040907@hurleysoftware.com>
Date:	Wed, 25 Sep 2013 20:06:58 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	codonell <codonell@...hat.com>, Eduard Benes <ebenes@...hat.com>,
	Karel Srot <ksrot@...hat.com>,
	Matt Newsome <mnewsome@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: v3.10 breaks T.tcflush (Was: tty: disassociate_ctty() sends the
 extra SIGCONT)

On 09/25/2013 12:21 PM, Oleg Nesterov wrote:
> Peter, thanks for your explanations about tty_old_pgrp/etc,
> I'll try to reply later. I need to read your email carefully.

Ok.

If you're interested, I highly recommend reading Chapter 34
("Process Groups, Sessions, and Job Control") of Michael Kerrisk's
book, The Linux Programming Interface.

> FYI, LSB tests report another failure starting from 3.10.
>
> See lsb-test-core/lts_vsx-pcts/tset/POSIX.os/devclass/tcflush/tcflush.c
> attached below. test4() fails with
>
> 	SIGTTOU not received
> 	tcflush(TCIOFLUSH) action was performed
> 	when TOSTOP was set
>
> I'll try to investigate, but let me repeat I know absolutely nothing
> about drivers/tty/, termios, etc. Perhaps you can take a look? So far I
> didn't even look into the attached code, I have no idea what it does.

Thanks for the report. I looked into this and found another regression.
Patch coming.

Looks like I'll be integrating LSB into my testbench.

Regards,
Peter Hurley

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