Re: siginfo_t fracturing, especially for 64/32-bit compatibility mode

[Daniel Jacobowitz <dan@debian.org>]

On Sat, Jan 03, 2004 at 02:07:26AM +0100, Andi Kleen wrote:
> On Fri, 2 Jan 2004 19:44:06 -0500
> Jakub Jelinek <jakub@redhat.com> wrote:
> 
> > On Sat, Jan 03, 2004 at 01:24:33AM +0100, Andi Kleen wrote:
> > > > rt_sigqueueinfo(2) subverts this by reserving a range of si_code
> > > > values for users, and there is nothing about them to indicate to the
> > > > kernel which fields of siginfo_t are actually in use.  This is not a
> > > 
> > > My understanding was that the syscall always only supports si_int/si_ptr.
> > 
> > No, why?
> 
> Because otherwise it cannot be supported in the 32bit emulation. Or rather you
> won't get any conversion.

That's probably an acceptable limitation  I think what the OP pointed
out is that they _are_ converted, from 32-bit to 64-bit, when a 32-bit
process sends a siginfo to another 32-bit process, thereby garbling it.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer