Re: More questions...

["H. Peter Anvin" <hpa@zytor.com>]

Andi Kleen wrote:

> On Mon, Oct 15, 2001 at 03:02:30PM -0700, H. Peter Anvin wrote:
>
>>How do I determine it *in userspace*?
>>
>
> No portable way. The portable API (siginfo_t) doesn't supply it ATM.
> In theory it could be put into si_errno, but no current kernel does that.
> Most architectures will likely gives it to you in some form in the
> arch specific signal frame however.
>


IWBNI it could be added, assuming it can be done without breaking existing
applications (perhaps a flag could be snuck in somewhere.)  I can write
the code so that if the information is present, it uses it; otherwise the
worst that can happen is having to do the two-step NONE -> READ ->
READ|WRITE transition, as it currently is.

	-hpa


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