linux-kernel - Re: [PATCH 4/4] selftests: ftrace: Output only to console with "--logdir -"

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Message-ID: <20170706130658.GC2511@lianli.shorne-pla.net>
Date:   Thu, 6 Jul 2017 22:06:58 +0900
From:   Stafford Horne <shorne@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        linux-kselftest@...r.kernel.org, shuah@...nel.org,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        naresh.kamboju@...aro.org
Subject: Re: [PATCH 4/4] selftests: ftrace: Output only to console with
 "--logdir -"

On Wed, Jul 05, 2017 at 12:25:06PM -0400, Steven Rostedt wrote:
> On Tue,  4 Jul 2017 15:38:55 +0900
> Masami Hiramatsu <mhiramat@...nel.org> wrote:
> 
> > +    local testlog=`mktemp $LOG_DIR/${testname}-log.XXXXXX`
> > +  else
> > +    local testlog=`/proc/self/fd/1`
> 
> cute trick.

Shouldn't this be:

   local testlog=/proc/self/fd/1

without the backticks and subshell? We just want to write to the stdout
file not execute it.

Or am missing something.

-Stafford