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 19:46:17 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Namhyung Kim <namhyung@...nel.org>
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

(2013/12/23 15:17), Namhyung Kim wrote:
> 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.

Oops ...

>> +				return ret;
>> +			}
>> +		}
>>  		params.target = str;
> 
> It now points either a dynamically allocated string or not..

Ah, right. OK, I'll use strdup for such case.

Thank you!

-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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