From: Linus Torvalds <torvalds@linux-foundation.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>, Ray Lee <ray-lk@madrabbit.org>,
LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] kdesu broken
Date: Tue, 28 Jul 2009 11:44:00 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.2.01.0907281141070.3186@localhost.localdomain> (raw)
In-Reply-To: <20090728180649.596c5412@lxorguk.ukuu.org.uk>
On Tue, 28 Jul 2009, Alan Cox wrote:
>
> If you are asking that question I don't think you understand the bug
> report.
I don't think YOU understand what I'm saying.
> > The correct expectation is that the select() (or read()) should have
> > returned any data that it saw _before_ it returns EINTR.
>
> read() handles that correctly, has always done so.
>
> emacs from the traces does this
>
> set O_NDELAY
> wait for SIGCLD
> read()
> EAGAIN
> shit_myself();
Go back and read my email.
Emacs is ENTIRELY PROPER in doing that. If it has gotten the SIGCHLD, then
it damn well should know that the data is buffered already, since the
child sure as hell isn't writing any more. So if it gets EAGAIN due to the
SIGCHLD, it can assume that there isn't going to be any more data.
My point is that a program _should_ be able to depend on simple causality
when it comes to ordering rules. If the child did a write() before
exiting, then we should see the data before SIGCHLD.
It's really that simple.
Linus
next prev parent reply other threads:[~2009-07-28 18:44 UTC|newest]
Thread overview: 104+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-23 23:45 [Regression] " Rafael J. Wysocki
2009-07-24 0:21 ` Ray Lee
2009-07-24 15:21 ` Rafael J. Wysocki
2009-07-24 15:40 ` Alan Cox
2009-07-24 16:34 ` Linus Torvalds
2009-07-25 6:04 ` OGAWA Hirofumi
2009-07-25 13:31 ` Alan Cox
2009-07-25 14:05 ` Alan Cox
2009-07-25 14:55 ` OGAWA Hirofumi
2009-07-25 15:32 ` Alan Cox
2009-07-26 11:51 ` OGAWA Hirofumi
2009-07-27 10:57 ` Alan Cox
2009-07-27 12:07 ` OGAWA Hirofumi
2009-07-27 12:46 ` OGAWA Hirofumi
2009-07-27 13:23 ` [PATCH] " Alan Cox
2009-07-27 13:50 ` OGAWA Hirofumi
2009-07-27 13:58 ` Alan Cox
2009-07-27 15:04 ` OGAWA Hirofumi
2009-07-27 16:14 ` Aneesh Kumar K.V
2009-07-27 16:42 ` Alan Cox
2009-07-27 17:12 ` Aneesh Kumar K.V
2009-07-27 19:28 ` OGAWA Hirofumi
2009-07-27 19:40 ` Linus Torvalds
2009-07-27 20:38 ` OGAWA Hirofumi
2009-07-27 20:45 ` Linus Torvalds
2009-07-27 21:42 ` Alan Cox
2009-07-27 22:04 ` Linus Torvalds
2009-07-27 22:41 ` Alan Cox
2009-07-27 20:52 ` Alan Cox
2009-07-27 21:22 ` Linus Torvalds
2009-07-27 21:54 ` Alan Cox
2009-07-27 21:20 ` Alan Cox
2009-07-28 5:33 ` OGAWA Hirofumi
2009-07-28 10:22 ` Alan Cox
2009-07-28 10:42 ` OGAWA Hirofumi
2009-07-28 15:49 ` Linus Torvalds
2009-07-28 16:42 ` Alan Cox
2009-07-28 16:49 ` Linus Torvalds
2009-07-28 16:52 ` Linus Torvalds
2009-07-28 17:09 ` Alan Cox
2009-07-28 18:45 ` Linus Torvalds
2009-07-28 17:06 ` Alan Cox
2009-07-28 18:44 ` Linus Torvalds [this message]
2009-07-28 18:56 ` Alan Cox
2009-07-28 19:08 ` Linus Torvalds
2009-07-28 19:15 ` Alan Cox
2009-07-28 19:56 ` Greg KH
2009-07-28 20:47 ` Theodore Tso
2009-07-28 21:01 ` Greg KH
2009-07-28 22:02 ` Theodore Tso
2009-07-28 23:49 ` Alan Cox
2009-07-29 0:12 ` Greg KH
2009-07-30 23:16 ` Alan Cox
2009-07-30 23:24 ` Greg KH
2009-07-31 13:49 ` Alan Cox
2009-07-31 14:17 ` Greg KH
2009-07-28 23:46 ` Alan Cox
2009-07-29 0:10 ` Linus Torvalds
2009-07-29 0:26 ` Linus Torvalds
2009-07-29 7:01 ` Aneesh Kumar K.V
2009-07-29 0:34 ` Alan Cox
2009-07-29 1:04 ` Linus Torvalds
2009-07-29 1:23 ` Linus Torvalds
2009-07-29 11:17 ` Alan Cox
2009-07-29 8:59 ` Alan Cox
2009-07-29 15:48 ` Linus Torvalds
2009-07-29 15:55 ` Alan Cox
2009-07-29 16:05 ` Linus Torvalds
2009-07-29 16:39 ` Alan Cox
2009-07-29 19:07 ` Linus Torvalds
2009-07-29 2:50 ` Gene Heskett
2009-07-29 4:49 ` Linus Torvalds
2009-07-29 4:54 ` Linus Torvalds
2009-07-29 5:04 ` Gene Heskett
2009-07-29 5:00 ` Gene Heskett
2009-07-29 5:08 ` Andrew Morton
2009-07-29 7:46 ` Gene Heskett
2009-07-29 11:07 ` Alan Cox
2009-07-29 17:40 ` Gene Heskett
2009-07-29 18:28 ` Frans Pop
2009-07-29 18:43 ` Gene Heskett
2009-07-29 19:08 ` Frans Pop
2009-07-29 19:19 ` Gene Heskett
2009-07-30 12:43 ` Valdis.Kletnieks
2009-07-30 15:35 ` Gene Heskett
2009-07-30 18:39 ` Valdis.Kletnieks
2009-07-31 2:01 ` H. Peter Anvin
2009-07-28 15:48 ` Linus Torvalds
2009-07-28 16:16 ` OGAWA Hirofumi
2009-07-27 18:28 ` Andreas Schwab
2009-07-27 13:58 ` Aneesh Kumar K.V
2009-07-25 20:12 ` [Regression] " Rafael J. Wysocki
2009-07-26 17:41 ` Aneesh Kumar K.V
2009-07-29 2:20 ` Gene Heskett
2009-07-25 11:48 ` Alan Cox
2009-07-25 14:02 ` Frans Pop
2009-07-25 20:16 ` Rafael J. Wysocki
2009-07-25 21:03 ` Alan Cox
2009-07-26 15:51 ` Sergey Senozhatsky
2009-07-24 18:25 ` Aneesh Kumar K.V
2009-07-25 12:07 ` Alan Cox
2009-07-25 16:18 ` Aneesh Kumar K.V
2009-07-25 17:06 ` Aneesh Kumar K.V
2009-07-29 19:09 ` [Regression] kdesu broken, now usb fixed in current git pull Gene Heskett
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