linux-kernel - Re: Bash not reacting to Ctrl-C

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Date:	Wed, 9 Feb 2011 13:37:28 -0600
From:	Michael Witten <mfwitten@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	roland@...hat.com, jan.kratochvil@...hat.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	bug-bash@....org, Chet Ramey <chet.ramey@...e.edu>
Subject: Re: Bash not reacting to Ctrl-C

On Wed, Feb 9, 2011 at 08:53, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Michael Witten <mfwitten@...il.com> wrote:
>
>> On Mon, Feb 7, 2011 at 07:08, Oleg Nesterov <oleg@...hat.com> wrote:
>> > Now that it is clear what happens, the test-case becomes even more
>> > trivial:
>> >
>> >        bash-4.1$ ./bash -c 'while true; do /bin/true; done'
>> >        ^C^C
>> >
>> > needs 4-5 attempts on my machine.
>>
>> I feel like the odd penguin out.
>>
>> I can't reproduce the behavior in question when using that example (I
>> haven't tried the other).
>>
>> I'm running:
>>
>>     * bash version 4.1.9(2)-release (i686-pc-linux-gnu)
>>
>>     * linux 2.6.38-rc4 (100b33c8bd8a3235fd0b7948338d6cbb3db3c63d)
>
> Oleg provided another testcase, can you reproduce the Ctrl-C problem with this
> it?
>
> #!/bin/bash
>
> perl -we '$SIG{INT} = sub {exit}; sleep'
>
> echo "Hehe, I am going to sleep after ^C"
> sleep 100
>
>
> Thanks,
>
>        Ingo
>

Yes, that requires me to press Ctrl-C twice in order to escape the
entire script. However, what do you expect the following to do:

#!/bin/bash

perl -we '$SIG{INT} = "IGNORE"; sleep 10'

echo "Hehe, I am going to sleep after ^C"
sleep 100
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