RE: force_sig_info
From: Davide Libenzi (davidel_at_xmailserver.org)
Date: 09/05/04
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- In reply to: Zach, Yoav: "RE: force_sig_info"
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Date: Sun, 5 Sep 2004 06:35:44 -0700 (PDT) To: "Zach, Yoav" <yoav.zach@intel.com>
On Sun, 5 Sep 2004, Zach, Yoav wrote:
> >-----Original Message-----
> >From: Linus Torvalds [mailto:torvalds@osdl.org]
> >Sent: Friday, September 03, 2004 21:12
> >To: Yoav Zach
> >Cc: akpm@osdl.org; linux-kernel@vger.kernel.org; Zach, Yoav
> >Subject: Re: force_sig_info
> >
> >
> >Why are you blocking signals that you want to get? Sounds like
> >a bug in
> >your program.
>
> It's a translator - it emulates the behavior of the translated
> 'process', which is the one that sets the signal mask. On the
> other hand, it has its own logic, which requires handling of
> certain HW exceptions. In 2.4, signals that were raised due to
> HW exceptions could be handled by the translator regardless of
> the mask that was set by the translated process. We lost this
> ability in 2.6. It will be very good for our product, and I
> believe any similar product where a native process emulates
> behavior of another process, if we could have this ability
> back.
Below is the latest patch I posted (applies on some Jun 2004 2.6.x) to
bring 2.6 back to the 2.4 behaviour, but then it has been decided to leave
2.6 as is.
- Davide
--- a/kernel/signal.c 2004-06-28 14:28:51.000000000 -0700
+++ b/kernel/signal.c 2004-06-28 14:29:31.000000000 -0700
@@ -820,8 +820,9 @@
int ret;
spin_lock_irqsave(&t->sighand->siglock, flags);
- if (sigismember(&t->blocked, sig) || t->sighand->action[sig-1].sa.sa_handler == SIG_IGN) {
+ if (t->sighand->action[sig-1].sa.sa_handler == SIG_IGN)
t->sighand->action[sig-1].sa.sa_handler = SIG_DFL;
+ if (sigismember(&t->blocked, sig)) {
sigdelset(&t->blocked, sig);
recalc_sigpending_tsk(t);
}
-
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- Previous message: Tonnerre: "Re: The argument for fs assistance in handling archives"
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