linux-kernel - Re: [PATCH 1/2] perf tests: Fix to get negative exit codes

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Date:	Mon, 11 May 2015 15:17:07 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	He Kuang <hekuang@...wei.com>
Cc:	acme@...nel.org, jolsa@...nel.org, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, wangnan0@...wei.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf tests: Fix to get negative exit codes

On Mon, May 11, 2015 at 12:28:35PM +0000, He Kuang wrote:
> WEXITSTATUS consists of the least significant 8 bits of the status
> argument, so we should convert the value to signed char if we have valid
> negative exit codes. And the return value of test->func() contains
> negative values:
> 
>   enum {
>           TEST_OK   =  0,
>           TEST_FAIL = -1,
>           TEST_SKIP = -2,
>   };
> 
> Before this patch:
> 
>   $ perf test -v 1
>   ...
>   test child finished with 254
>   ---- end ----
>   vmlinux symtab matches kallsyms: FAILED!
> 
> After this patch:
> 
>   $ perf test -v 1
>   ...
>   test child finished with -2
>   ---- end ----
>   vmlinux symtab matches kallsyms: Skip

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka

> 
> Signed-off-by: He Kuang <hekuang@...wei.com>
> ---
>  tools/perf/tests/builtin-test.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
> index 4f40981..f42af98 100644
> --- a/tools/perf/tests/builtin-test.c
> +++ b/tools/perf/tests/builtin-test.c
> @@ -219,7 +219,7 @@ static int run_test(struct test *test)
>  	wait(&status);
>  
>  	if (WIFEXITED(status)) {
> -		err = WEXITSTATUS(status);
> +		err = (signed char)WEXITSTATUS(status);
>  		pr_debug("test child finished with %d\n", err);
>  	} else if (WIFSIGNALED(status)) {
>  		err = -1;
> -- 
> 1.8.5.2
> 
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