Re: [PATCH v3 2/3] perf record: Propagate exit status of a command line workload

[Namhyung Kim <namhyung@kernel.org>]

Hi Jiri and Peter,

On Tue, 29 Apr 2014 13:37:47 +0200, Jiri Olsa wrote:
> On Tue, Apr 29, 2014 at 01:19:39PM +0200, Peter Zijlstra wrote:
>> On Tue, Apr 29, 2014 at 12:56:54PM +0200, Jiri Olsa wrote:
>> > 
>> >   perf_counter tools: Propagate signals properly
>> >   commit f7b7c26e01e51fe46097e11f179dc71ce7950084
>> >   Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
>> >   Date:   Wed Jun 10 15:55:59 2009 +0200
>> > 
>> > but I dont think we need to do that
>> 
>> But but but, then you're re-introducing that fail again? That no good.

FYI, it's already gone with 804f7ac78803 ("perf record: handle death by
SIGTERM").

>
> well, I was trying the testcase you mentioned in the changelog
> and it seemed to work for me.. ;-) I guess I was lucky to hit
> the bash time window..
>
>   while :; do perf stat ./foo ; done
>
> so how does this work? bash will kill the loop if perf's wait
> status is WIFSIGNALED?

I'm not sure but isn't it *bash* to catch signal and terminate the
loop?  It seems the wait status of child has no business with the loop
termination.  Am I missing something?

  $ cat suicide.c
  #include <signal.h>
  
  int main(void)
  {
    raise(SIGTERM);
    return 0;
  }
  
  $ gcc -o suicide suicide.c
  
  $ while :; do ./suicide; done
  Terminated
  Terminated
  Terminated
  Terminated
  Terminated
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  ...


Thanks,
Namhyung