Re: [take12 0/3] kevent: Generic event handling mechanism.

From: Evgeniy Polyakov
Date: Wed Aug 23 2006 - 04:42:38 EST

On Wed, Aug 23, 2006 at 10:22:06AM +0200, Jari Sundell ( wrote:
> On 8/23/06, Evgeniy Polyakov <johnpol@xxxxxxxxxxx> wrote:
> >void * in structure exported to userspace is forbidden.
> Only void * I'm seeing belongs to the user, (udata) perhaps you are
> talking of something different?

Yes, exactly about it.

I put union {
u32 a[2];
void *b;
epcially to eliminate that problem.

And I'm not that sure aboit stuff like uptr_t or how they call pointers
in userspace and kernelspace.

> >long in syscall requires wrapper in per-arch code (although that
> >workaround _is_ there, it does not mean that broken interface should
> >be used).
> >poll uses millisecods - it is perfectly ok.
> The kernel is there to hide those ugly implementation details from the
> user, so I don't care that much about a workaround being required in
> some cases. More important, IMHO is consistency with the POSIX system
> calls.
> I guess as long as you use usec, at least it won't be a pain to use.

Andrew suggested to use nanoseconds there in u64 variable.
I think it is ok.

> Rakshasa

Evgeniy Polyakov
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