linux-kernel - Re: [PATCH 03/19] perf record: Improve write

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Date:	Mon, 21 Oct 2013 09:07:16 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 03/19] perf record: Improve write_output error message

On 20/10/13 23:43, Jiri Olsa wrote:
> On Fri, Oct 18, 2013 at 03:29:00PM +0300, Adrian Hunter wrote:
>> Improve the error message from write_output() to say
>> what failed to write and give the error number.
>>
>> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
>> ---
>>  tools/perf/builtin-record.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
>> index 92ca541..d269dfa 100644
>> --- a/tools/perf/builtin-record.c
>> +++ b/tools/perf/builtin-record.c
>> @@ -88,7 +88,7 @@ static int write_output(struct perf_record *rec, void *buf, size_t size)
>>  		int ret = write(rec->output, buf, size);
>>  
>>  		if (ret < 0) {
>> -			pr_err("failed to write\n");
>> +			pr_err("failed to write perf data, error: %m\n");
> 
> is this some kind of format magic? ;-) you wanted

It is a glibc extension.

> to print out 'ret' value, right?

No, errno

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