(10/15/13 3:30 AM), Tanaka Akira wrote:
> 2013/10/15 kosaki (Motohiro KOSAKI) <kosaki.motohiro / gmail.com>:
>> Issue #9008 has been updated by kosaki (Motohiro KOSAKI).
>>
>>
>> ENOTSUPP
>> Note:
>>
>> 524 mean ENOSUPP.
>
>> Any question?
>
> Is ENOTSUPP related with ENOTSUP defined by POSIX?

dunno.

1. Linux doesn't have ENOTSUP
2. Linux define ENOTSUPP as NFS specific and in-kernel only definition
3. ENOTSUPP is not exported to userland
4. but timer_create and other various syscall uses ENOTSUPP as ENOTSUP

I guess this is historical mess. And I guess 4 is a bug. But I'm not sure.