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From: "Clifford T. Matthews" <ctm@ardi.com>
To: Chris Wright <chrisw@osdl.org>
Cc: "Clifford T. Matthews" <ctm@ardi.com>, linux-kernel@vger.kernel.org
Subject: Re: trouble trapping SEGV on 2.6.11.2 & 2.6.12-rc4
Date: Tue, 24 May 2005 15:23:23 -0600	[thread overview]
Message-ID: <17043.39755.573568.293067@newbie.ardi.com> (raw)
In-Reply-To: <20050524204310.GJ23013@shell0.pdx.osdl.net>

>>>>> "Chris" == Chris Wright <chrisw@osdl.org> writes:

    Chris> 2.6 has been fixed...  So your program (which happens to be
    Chris> slightly buggy) no longer works as you expected.  See
    Chris> below.

Thanks for the quick response.  Using sigsetjmp and siglongjmp makes
the program print two lines.

I read the setjmp / sigsetjmp documentation and misunderstood it.

I had already seen that if I inserted "signal (SIGSEGV, segv_handler)"
before the second setjmp (not sigsetjmp), the program (under 2.6
kernels) still would die.

I guess what happens there is that after coming back from the longjmp,
the error handler is still segv_handler, but the receipt of the SEGV
signal itself is blocked and if you take a SEGV when the receipt of
SEGV is blocked a program dies with a SEGV, even if you have a SEGV
handler.

--Cliff Matthews <ctm@ardi.com>

  reply	other threads:[~2005-05-24 21:23 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-05-24 20:31 Clifford T. Matthews
2005-05-24 20:43 ` Chris Wright
2005-05-24 21:23   ` Clifford T. Matthews [this message]
2005-05-24 21:14 ` Richard B. Johnson

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