Date: Sun, 12 Oct 2008 11:29:37 +0200 From: Romain =?iso-8859-1?Q?Tarti=E8re?= <romain@blogreen.org> To: freebsd-hackers@freebsd.org Subject: Re: Is it possible to recover from SEGV? Message-ID: <20081012092937.GA53444@marvin.blogreen.org> In-Reply-To: <48F147A5.1040107@rawbw.com> References: <48F147A5.1040107@rawbw.com>
next in thread | previous in thread | raw e-mail | index | archive | help
--jI8keyz6grp/JLjh
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
Hi Yuri,
On Sat, Oct 11, 2008 at 05:41:09PM -0700, Yuri wrote:
> Is there a way to access from signal handler CPU registers as they
> were before signal, modify some of them, clear the signal and
> continue from the instruction that caused SEGV initially?
Maybe you can have a look to the development version of the
Enlightenment window manager [1]. It catches segfaults and displayed a
window to ask the user what to do (continue, abort). I experienced a
few crashes where this helpful window was triggered a dozen times, I
asked the window manager to continue and could save my work before
everything crashed.
First moves in the svn repository [2] (basically grep SEGV):
| ./src/bin/e_exec.c:456: else if (cfdata->event.exit_signal =3D=3D SIGSEGV)
| ./src/bin/e_desklock.c:689: sigaction(SIGSEGV, &action, NULL);
| ./src/bin/e_object.c:153: sigaction(SIGSEGV, &act, &oact);
| ./src/bin/e_object.c:158: sigaction(SIGSEGV, &oact, NULL);
| ./src/bin/e_object.c:168: sigaction(SIGSEGV, &oact, NULL);
| ./src/bin/e_signals.c:28: e_alert_show("This is very bad. Enlightenment=
SEGV'd.\n"
| ./src/bin/e_signals.c:48: e_alert_show("This is very bad. Enlightenment=
SEGV'd.\n"
| ./src/bin/e_main.c:99: sigaction(SIGSEGV, &action, NULL);
| ./src/bin/e_main.c:322:// FIXME: SEGV's on shutdown if fm2 windows up - d=
isable for now.
Hope that helps!
Romain
References:
1. http://enlightenment.org/
2. http://svn.enlightenment.org/svn/e/trunk/e/
--=20
Romain Tarti=E8re <romain@blogreen.org> http://romain.blogreen.org/
pgp: 8DAB A124 0DA4 7024 F82A E748 D8E9 A33F FF56 FF43 (ID: 0xFF56FF43)
(plain text =3Dnon-HTML=3D PGP/GPG encrypted/signed e-mail much appreciated)
--jI8keyz6grp/JLjh
Content-Type: application/pgp-signature
Content-Disposition: inline
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.9 (FreeBSD)
iEYEARECAAYFAkjxw4EACgkQ2OmjP/9W/0OTsACdGIzyfRR9vWqAO66XUb1eFTxq
RYYAn2VQ1tZ5Zy/pZHmRq53MB1TRLr2J
=kzze
-----END PGP SIGNATURE-----
--jI8keyz6grp/JLjh--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20081012092937.GA53444>