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Date:	Wed, 22 Feb 2012 17:06:17 -0800
From:	"H. Peter Anvin" <>
To:	Roland McGrath <>
CC:	Kees Cook <>, Will Drewry <>,
	Andrew Lutomirski <>,
	Indan Zupancic <>,,,,,,,,,,,,,,,,,,,,,,
Subject: Re: [PATCH v10 07/11] signal, x86: add SIGSYS info and make it synchronous.

On 02/22/2012 04:50 PM, Roland McGrath wrote:
> On Wed, Feb 22, 2012 at 4:29 PM, H. Peter Anvin <> wrote:
>> Can we really introduce force-kill semantics for a POSIX-defined signal?
>> Other user space programs might use it for other purposes.
> The semantics are based on how the signal was generated, not what signal
> number it was.  The only thing that depends on the signal number is
> SYNCHRONOUS_MASK, which just determines in which order pending signals are
> dequeued (POSIX says it may be any order).  We only have that so your state
> doesn't get unhelpfully warped to another signal handler entry point
> (including fiddling the stack) before you dump core.
> No use of SIGSYS is specified by POSIX at all, of course, since "system
> call" is an implementation concept below the level POSIX specifies.

I meant whether or not a signal can be blocked/caught and the fact that
the signal exists at all.

Now I guess we could have "blockable" and "unblockable" SIGSYS, but that
would seem to have its own set of issues...


H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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