[CRIU] [PATCH 1/4] signalfd: add ability to return siginfo in a raw format

[Pavel Emelyanov]

On 12/25/2012 07:27 PM, Oleg Nesterov wrote:
> On 12/25, Oleg Nesterov wrote:
>>
>> And if we add another format we should think
>> twice.
> 
> And btw this applies to the whole series.
> 
> I guess that probably you actually need DUMP, not DEQUEUE. but the
> latter is not trivial. However, perhaps we can do this assuming that
> all other threads are sleeping and nobody can do dequeue_signal().
> Say, we can play with ppos/llseek. If *ppos is not zero,
> signalfd_dequeue() could dump the nth entry from list or return 0.

This would be perfect, but isn't it better to preserve the pos
semantics -- we do know size of entry we're about to copy, we can
treat pos as offset in bytes, not in elements.

> Oleg.
> 
> .
>