Re: [PATCH] perf: excluding "." and ".." directories when calculating tids.

[Gui Jianfeng <guijianfeng@cn.fujitsu.com>]

Adam Schrotenboer wrote:
> On 06/15/2010 10:21 PM, Gui Jianfeng wrote:
>> Introduce a filter function to skip "." and ".." directories when calculating
>> tid number.
>>
>> Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
>> ---
>>  tools/perf/util/thread.c |   11 ++++++++++-
>>  1 files changed, 10 insertions(+), 1 deletions(-)
>>
>> diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
>> index 1f7ecd4..9a448b4 100644
>> --- a/tools/perf/util/thread.c
>> +++ b/tools/perf/util/thread.c
>> @@ -7,6 +7,15 @@
>>  #include "util.h"
>>  #include "debug.h"
>>  
>> +/* Skip "." and ".." directories */
>> +static int filter(const struct dirent *dir)
>> +{
>> +	if (dir->d_name[0] == '.')
>> +		return 0;
>> +	else
>> +		return 1;
>> +}
>> +
>>   
> 
> Is this safe? Can you _never_ have a d_name with a leading dot, like '
> .hidden' ??
> Maybe should
> if(dir->d_name[0] == '.' && (dir->d_name[1] == '\0' || (dir->d_name[1]
> == '.' && dir->d_name[2] == '\0')))
> 
> Admittedly I don't think it happens in the current procfs, but I'd want
> to be careful regardless.

Actually, we only care the numeral directories. So, even if there's a ".hidden",
it's fine to filter out this directory. Just keep things simple here.

Thanks,
Gui

> 
>