On Mon, 2006-03-06 at 22:25 +1100, Paul Mackerras wrote:
> I have been looking at the equivalent code on powerpc. This looks to
> me like we aren't calling do_signal on the way back out of the system
> call to userspace on x86 when the _TIF_RESTORE_SIGMASK thread_info
> flag is set. I had a look at the code in arch/i386/kernel and I can't
> see why we wouldn't be getting to do_signal, but x86 assembly is not
> my strong point.
You can't see it because it's not in assembly -- it's in
do_notify_resume() in signal.c :)
> The fact that userspace is seeing the -ERESTARTNOHAND return value
> from the rt_sigsuspend strongly suggests that we aren't actually
> calling do_signal, though.
That's just because we do the ptrace stop _before_ do_signal now, just
as we already did for all other restartable syscalls. The signal really
is happening -- you can see the sigreturn().
--
dwmw2
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