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| From | Eric Sosman <esosman@ieee-dot-org.invalid> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: signal() anomaly |
| Date | 2012-07-31 16:35 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <jv9fiu$3bj$1@dont-email.me> (permalink) |
| References | <jv9e9e$bj3$1@speranza.aioe.org> |
On 7/31/2012 4:13 PM, hip cat wrote:
> What up
>
> I've used signal to set SIGSEGV to SIG_IGN. But when I later dereference
> a null pointer my program still crashes out with segfault SIGSEGV. What
> gives?
Did you check that the signal() call succeeded? That is,
was the returned value SIG_ERR or something else?
On POSIX systems, ignoring SIGSEGV produces undefined behavior.
The C Standard isn't quite so clear to me: It's U.B. if a signal
handler for SIGSEGV returns (7.14.1.1p3), but SIG_IGN is not a
"signal handler" under the definition of 7.14.1.1p2.
--
Eric Sosman
esosman@ieee-dot-org.invalid
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signal() anomaly hip cat <nospam@nospam.com> - 2012-07-31 20:13 +0000
Re: signal() anomaly Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-31 16:35 -0400
Re: signal() anomaly hip cat <nospam@nospam.com> - 2012-08-01 18:59 +0000
Re: signal() anomaly Nick Bowler <nbowler@draconx.ca> - 2012-08-01 20:14 +0000
Re: signal() anomaly falk@rahul.net (Edward A. Falk) - 2012-07-31 22:12 +0000
Re: signal() anomaly hip cat <nospam@nospam.com> - 2012-08-01 18:58 +0000
Re: signal() anomaly James Kuyper <jameskuyper@verizon.net> - 2012-08-01 15:33 -0400
Re: signal() anomaly hip cat <nospam@nospam.com> - 2012-08-01 20:47 +0000
Re: signal() anomaly Paul <nospam@needed.com> - 2012-08-01 17:34 -0400
Re: signal() anomaly Johann Klammer <klammerj@NOSPAM.a1.net> - 2012-08-02 06:34 +0200
Re: signal() anomaly Paul <nospam@needed.com> - 2012-08-02 07:10 -0400
Re: signal() anomaly Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-01 18:07 -0400
Re: signal() anomaly Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-08-02 00:15 +0100
Re: signal() anomaly Nick Bowler <nbowler@draconx.ca> - 2012-08-02 00:05 +0000
Re: signal() anomaly Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-08-02 02:47 +0100
Re: signal() anomaly James Kuyper <jameskuyper@verizon.net> - 2012-08-01 18:13 -0400
Re: signal() anomaly James Kuyper <jameskuyper@verizon.net> - 2012-08-01 18:14 -0400
Re: signal() anomaly Nobody <nobody@nowhere.com> - 2012-08-02 12:52 +0100
Re: signal() anomaly Angel <angel+news@spamcop.net> - 2012-08-01 19:41 +0000
Re: signal() anomaly Kenneth Brody <kenbrody@spamcop.net> - 2012-08-01 16:16 -0400
Re: signal() anomaly Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-01 16:33 -0400
Re: signal() anomaly Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-08-02 00:22 +0100
Re: signal() anomaly Stephen Sprunk <stephen@sprunk.org> - 2012-08-02 00:55 -0500
Re: signal() anomaly Ike Naar <ike@sverige.freeshell.org> - 2012-08-02 07:01 +0000
Re: signal() anomaly Öö Tiib <ootiib@hot.ee> - 2012-09-08 20:53 -0700
Re: signal() anomaly Nobody <nobody@nowhere.com> - 2012-08-01 18:06 +0100
Re: signal() anomaly Tim Rentsch <txr@alumni.caltech.edu> - 2012-09-07 13:44 -0700
Re: signal() anomaly Kleuske <kleuske@nowhere.net> - 2012-08-02 20:52 +0000
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