linux-kernel - Re: [PATCH 2/2] ftracetest: Add --verbose option for showing echo output

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Message-ID: <20141205055245.GB18217@sejong>
Date:	Fri, 5 Dec 2014 14:52:45 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 2/2] ftracetest: Add --verbose option for showing echo
 output

On Fri, Dec 05, 2014 at 02:23:23PM +0900, Masami Hiramatsu wrote:
> (2014/12/05 14:08), Namhyung Kim wrote:
> > On Thu, Dec 04, 2014 at 02:41:23PM -0500, Masami Hiramatsu wrote:
> >> Add --verbose/-v option for showing echo output in testcases.
> >> This is good for checking the progress of testcases which
> >> take a longer time to run.
> >>
> >> To implement this feature, all the testcase failures are
> >> captured in ftracetest and send signal to set SIG_RESULT=FAIL.
> >>
> >> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> >> ---
> > 
> > [SNIP]
> >> -  # setup PID and PPID, $$ is not updated.
> >> -  (cd $TRACING_DIR; read PID _ < /proc/self/stat ;
> >> -   set -e; set -x; . $1) >> $testlog 2>&1
> >> -  eval_result $? $SIG_RESULT
> >> +  if [ $VERBOSE -ne 0 ]; then
> >> +    __run_test $1 2>> $testlog | tee -a $testlog
> > 
> > Shouldn't it be
> > 
> >        __run_test $1 2>&1 | tee -a $testlog
> > 
> > ?
> 
> No, that outputs both stdout and stderr to $testlog and console.
> What I'd like to do above is only stdout to $testlog and console and
> stderr goes only to $testlog. (Note that __run_test set -x which outputs
> every executed command to stderr)

Hmm.. so the actual output of the failing command is not shown on
console even when -v option is given, right?

Anyway I worried about that the order of messages might be mixed..

  echo msg1 > /dev/stdout
  echo msg2 > /dev/stderr
  echo msg3 > /dev/stdout
  echo msg4 > /dev/stderr

So the output in this case can be like msg2, msg4, msg1, and msg3..?

Thanks,
Namhyung
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