[PATCH] umount: always use umount2 syscall with specified flags

[Xabier Oneca -- xOneca]

Sorry to come so late, I've been very busy these days...

2015-10-05 19:04 GMT+02:00 Denys Vlasenko <vda.linux at googlemail.com>:
> On Sat, Oct 3, 2015 at 12:58 PM, Xabier Oneca  --  xOneca
> <xoneca at gmail.com> wrote:
>> Hello,
>>
>> Excuse my ignorance, but what does this typedef do?
>>
>> ------------------
>>     {
>>         typedef char bug[
>>             (OPT_FORCE != MNT_FORCE || OPT_LAZY != MNT_DETACH) ? -1 : 1
>>         ];
>>     }
>> ------------------
>>
>> My understanding is that this snippet catches when those two constants
>> are not equal and then trigger a compiler error by defining a char[-1]
>> type. Am I correct? If so, why isn't used the preprocessor #errror
>> with a less cryptic error description?
>
> Constants like MNT_FORCE may be enums, not literals.
> Preprocessor can't evaluate enums.

I see... So then, I said nothing :P

Thanks!

Xabier Oneca_,,_