linux-kernel - Re: [PATCH -tip 1/3] [CLEANUP] perf-probe: Expand given path to absolute path

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Date:	Mon, 23 Dec 2013 15:17:24 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	"Steven Rostedt \(Red Hat\)" <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"David A. Long" <dave.long@...aro.org>, systemtap@...rceware.org,
	yrl.pp-manager.tt@...achi.com
Subject: Re: [PATCH -tip 1/3] [CLEANUP] perf-probe: Expand given path to absolute path

Hi Masami,

On Fri, 20 Dec 2013 10:02:57 +0000, Masami Hiramatsu wrote:
> Expand given path to absolute path in option parser,
> except for a module name. Instead of expanding it later,
> this get the absolute path in early stage.
>
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> ---
>  tools/perf/builtin-probe.c    |    9 +++++++++
>  tools/perf/util/probe-event.c |   11 ++---------
>  2 files changed, 11 insertions(+), 9 deletions(-)
>
> diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
> index 6ea9e85..b40d064 100644
> --- a/tools/perf/builtin-probe.c
> +++ b/tools/perf/builtin-probe.c
> @@ -180,6 +180,15 @@ static int opt_set_target(const struct option *opt, const char *str,
>  		else
>  			return ret;
>  
> +		/* Expand given path to absolute path, except for modulename */
> +		if (params.uprobes || strchr(str, '/')) {
> +			str = realpath(str, NULL);
> +			if (!str) {
> +				pr_warning("Failed to find the path of %s.\n",
> +					   str);

It won't print the path since the str already was overwritten to NULL.


> +				return ret;
> +			}
> +		}
>  		params.target = str;

It now points either a dynamically allocated string or not..

Thanks,
Namhyung


>  		ret = 0;
>  	}
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