Re: Re: [PATCH] ftracetest: Replace usleep with sleep 0.000001

From: Masami Hiramatsu
Date: Thu Dec 11 2014 - 00:12:49 EST


(2014/12/10 17:19), Namhyung Kim wrote:
> Hi Michael,
> On Wed, Dec 10, 2014 at 1:38 PM, Michael Ellerman <mpe@xxxxxxxxxxxxxx> wrote:
>> usleep is a Fedoraism, it's not generally available on Debian based
>> systems AFAICS.
>> GNU sleep accepts a floating point argument, so use that instead.
> I tested it on busybox not Debian, sorry. But it seems busybox's
> sleep doesn't support floating point argument..
> / # ls -l `which sleep`
> lrwxrwxrwx 1 root rooot 7 May 22 2014 /bin/sleep -> busybox
> / # sleep 0.1
> sleep: invalid number '0.1'

I also have same result. Basically, ftracetest should be able to run on busybox.
So, I think we'd better check whether usleep is available, and if not, fallback
to sleep like as below.

if which usleep &> /dev/null; then
usleep 1
sleep 0.000001

Thank you,

Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory

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