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

[Andi Kleen <ak@suse.de>]

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.

> 
> > > 
> > > The current conflicts are:
> > 
> > [...SI_TKILL, SI_ASYNCIO...] that's broken. We just cannot support that. This aspect of 
> > SuS just cannot be emulated in user space, glibc was misguided about attempting
> > it.
> 
> SI_ASYNCNL is -60, not -6.
> Negative si_code values are reserved for userspace, while positive ones are for
> kernel space.

Ok, if the kernel generates that that's broken too then.

-Andi