Re: kern/170203: [kern] piped dd' s don' t behave sanely
On 2012/7/29 9:02, Garrett Cooper wrote:
> On Sat, Jul 28, 2012 at 5:24 PM, David Xu <listlog2011@gmail.com> wrote:
>> On 2012/7/28 5:50, Garrett Cooper wrote:
>>> The following reply was made to PR kern/170203; it has been noted by
>>> GNATS.
>>>
>>> From: Garrett Cooper <yanegomi@gmail.com>
>>> To: bug-followup@FreeBSD.org, yanegomi@gmail.com
>>> Cc:
>>> Subject: Re: kern/170203: [kern] piped dd's don't behave sanely
>>> when
>>> dealing with a fifo
>>> Date: Fri, 27 Jul 2012 14:47:47 -0700
>>>
>>> Hi David!
>>> I'll give the patches you provided a shot this weekend.
>> FIFO pipe is quite broken! Beside the bug you have reported, there is
>> another bug,
>> when a writer closed the pipe, select() on reader side will never return !
>> I am curious that so long time, nobody found the bugs, does it because FIFO
>> is seldom used by people ?
> Hmmm.. that's unfortunate. If you have a test program you can
> provide then I can test on a 7.x variant of FreeBSD as well as FreeBSD
> 8.3 (I'm curious as to whether or not it's fallout from recent
> refactoring related to pipe(2), which I don't believe made it back to
> 8.x).
> Thanks!
> -Garrett
I have just written two quick-and-dirty test cases:
http://people.freebsd.org/~davidxu/patch/fifopipe/fifo_selectread.c
http://people.freebsd.org/~davidxu/patch/fifopipe/fifo_selectwrite.c
without patch for kernel code, a child process will print out "timeout".
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