linux-kernel - Re: [PATCH 4/5] trace-cmd: fix argument parsing minor BUG

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Date:   Tue, 25 Apr 2017 19:07:06 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Federico Vaga <federico.vaga@...a.pv.it>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] trace-cmd: fix argument parsing minor BUG

On Sun, 23 Apr 2017 12:22:57 +0200
Federico Vaga <federico.vaga@...a.pv.it> wrote:

> For some reason the list command does not use anymore `getopt()`
> to parse the arguments, instead it uses a custum implementation.
> 
> During this change [5da0eff trace-cmd: Add regex for listing of events]
> the variable `optind` has been forgotten.
> 
> To reproduce the problem try to use invalid arguments. The application
> will not report the correct invalid argument
> 
> $ ./trace-cmd list -a
> list: invalid option -- 'i'
> 
> Signed-off-by: Federico Vaga <federico.vaga@...a.pv.it>
> ---
>  trace-cmd.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/trace-cmd.c b/trace-cmd.c
> index 1a62faa..a05df92 100644
> --- a/trace-cmd.c
> +++ b/trace-cmd.c
> @@ -706,7 +706,7 @@ int main (int argc, char **argv)
>  					break;
>  				default:
>  					fprintf(stderr, "list: invalid option -- '%c'\n",
> -						argv[optind][1]);
> +						argv[i][1]);

Hmm, I had this fixed back in September. I haven't push in a long time.

Well, I applied your other patches (Thanks!). I'm going to finally
start updating trace-cmd this week.

-- Steve
 
>  					usage(argv);
>  				}
>  			}