User data of epoll event is reported abnormally by epoll_wait.

[blake kim via Digitalmars-d]

On Wednesday, 20 August 2014 at 06:17:43 UTC, Dominikus Dittes 
Scherkl wrote:
> On Wednesday, 20 August 2014 at 06:11:42 UTC, blake kim wrote:
>> But I don't think this is right. Many C APIs need structure as 
>> argument and adjusting align each structure doesn't make sense.
>>
>> Is this problem a Bug of D ?
> Default alignment in D is pointersize (size_t) - so 8 on 64bit.
> But most C compilers default to 4 regardless of pointersize.
> I think this is more a bug in C than in D.

epoll_wait is a system API on Linux.

So, I can't agree that it is a bug of C in alignment.

C uses 4 byte alignment, then, I think, it is sensible that D 
should follow that.

Actually,  In core.sys.linux.epoll.d, struct epoll_event doesn't 
assign a specific align so that the problem is caused.