Re: [PATCH] POSIX timers for 2.3.25
Matthew Wilcox (Matthew.Wilcox@genedata.com)
Mon, 8 Nov 1999 09:02:15 +0100
On Sun, Nov 07, 1999 at 06:33:43PM +0100, Robert de Vries wrote:
> On Sun, 7 Nov 1999, Matthew Wilcox wrote:
>
> > On Sun, Nov 07, 1999 at 05:59:12PM +0100, Robert de Vries wrote:
> > > The siginfo structure is slightly changed. It moves si_value out of the
> > > _rt part of the union. si_value is used both by _rt and _timer and must
> > > map to the same field.
> >
> > You can't do this. You've just broken binary compatibility with any
> > application that uses POSIX RT signals. I can't see a nice way of doing
> > this though. Can anyone else?
>
> IMHO, NOT doing this now gives more problems that doing it "right" at this
> point. I must admit I am not very comfortable with this change either,
> but I don't see any other way, which is not kludgy.
> I'm open to suggestions. I would really not have two _sigval's in two
> structs in the same union. But then again, is it worth breaking a few
> apps at this point?
If this _really_ needs doing then we need a PER_NEWLINUX, change the
kernel internal structures to the way you want, then translate the
structures to the appropriate form for old Linux binaries whenever
delivering a signal. It'll be unpleasant.
--
Matthew Wilcox <willy@bofh.ai>
"Windows and MacOS are products, contrived by engineers in the service of
specific companies. Unix, by contrast, is not so much a product as it is a
painstakingly compiled oral history of the hacker subculture." - N Stephenson
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