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.hun...@intel.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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