[PATCH] sysconf: Fix missing definition of UIO_MAXIOV on Linux [BZ #22321]

[Florian Weimer]

On 10/19/2017 09:13 PM, Carlos O'Donell wrote:
>> +  TEST_VERIFY (IOV_MAX == uio_maxiov_value ());
>> +  TEST_VERIFY (UIO_MAXIOV == uio_maxiov_value ());
>> +  TEST_VERIFY (sysconf (_SC_UIO_MAXIOV) == uio_maxiov_value ());
>> +  TEST_VERIFY (sysconf (_SC_IOV_MAX) == uio_maxiov_value ());

> Is there an expectation that the value, although consistent,
> should not be -1?
> 
> e.g.
> TEST_VERIFY (IOV_MAX != -1);
> TEST_VERIFY (UIOV_MAX != -1);
> 
> Do we need to verify it is >= _XOPEN_IOV_MAX?
> 
> e.g.
> TEST_VERIFY (IOV_MAX >= _XOPEN_IOV_MAX);
> TEST_VERIFY (UIOV_MAX >= _XOPEN_IOV_MAX);

Should I add

   TEST_VERIFY (uio_maxiov_value () >= _XOPEN_IOV_MAX);

?

That would indirectly cover all the additional tests you suggest.

Thanks,
Florian