From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org
X-Spam-Level: 
X-Spam-Status: No, score=-1.0 required=5.0 tests=MAILING_LIST_MULTI
	autolearn=ham autolearn_force=no version=3.4.4
Received: (qmail 29462 invoked from network); 11 Mar 2023 11:28:59 -0000
Received: from minnie.tuhs.org (2600:3c01:e000:146::1)
  by inbox.vuxu.org with ESMTPUTF8; 11 Mar 2023 11:28:59 -0000
Received: from minnie.tuhs.org (localhost [IPv6:::1])
	by minnie.tuhs.org (Postfix) with ESMTP id 7D3244124E;
	Sat, 11 Mar 2023 21:28:58 +1000 (AEST)
Received: from relay05.pair.com (relay05.pair.com [216.92.24.67])
	by minnie.tuhs.org (Postfix) with ESMTPS id B192B40A4A
	for <coff@tuhs.org>; Sat, 11 Mar 2023 21:28:50 +1000 (AEST)
Received: from orac.inputplus.co.uk (unknown [84.51.130.45])
	by relay05.pair.com (Postfix) with ESMTP id EDF4F1A2746
	for <coff@tuhs.org>; Sat, 11 Mar 2023 06:28:49 -0500 (EST)
Received: from orac.inputplus.co.uk (orac.inputplus.co.uk [IPv6:::1])
	by orac.inputplus.co.uk (Postfix) with ESMTP id 22C0920145
	for <coff@tuhs.org>; Sat, 11 Mar 2023 11:28:49 +0000 (GMT)
From: Ralph Corderoy <ralph@inputplus.co.uk>
To: coff@tuhs.org
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
In-reply-to: <20230310174222.GB9225@mcvoy.com>
References: <zQ8vnI_R8uVwIaiBNo8FIH-OWMoES4VHfnxnnCNISkbFkJcpenXi4H75Z7zFStfclQAue8mixqjL6rWIMBAYRi3bbeGdv0SQUHA9NbQAb44=@protonmail.com> <69248852-1701-4938-8A4D-3B27F3018E83@iitbombay.org> <20230310174222.GB9225@mcvoy.com>
Date: Sat, 11 Mar 2023 11:28:49 +0000
Message-Id: <20230311112849.22C0920145@orac.inputplus.co.uk>
Message-ID-Hash: 2PKSXI2HRVNSRVASRLHNRJUMY6KBJJGO
X-Message-ID-Hash: 2PKSXI2HRVNSRVASRLHNRJUMY6KBJJGO
X-MailFrom: ralph@inputplus.co.uk
X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header
X-Mailman-Version: 3.3.6b1
Precedence: list
Subject: [COFF] Conditions, AKA exceptions.
List-Id: Computer Old Farts Forum <coff.tuhs.org>
Archived-At: <https://www.tuhs.org/mailman3/hyperkitty/list/coff@tuhs.org/message/2PKSXI2HRVNSRVASRLHNRJUMY6KBJJGO/>
List-Archive: <https://www.tuhs.org/mailman3/hyperkitty/list/coff@tuhs.org/>
List-Help: <mailto:coff-request@tuhs.org?subject=help>
List-Owner: <mailto:coff-owner@tuhs.org>
List-Post: <mailto:coff@tuhs.org>
List-Subscribe: <mailto:coff-join@tuhs.org>
List-Unsubscribe: <mailto:coff-leave@tuhs.org>

Hi Larry,

>         cmd = aprintf("gdb -batch -ex backtrace '%s/bk' %u 1>&%d 2>&%d",
>             bin, getpid(), fileno(f), fileno(f));
>
>         system(cmd);

I also came up with this, probably on an SGI Iris Indigo, and got it
added to the Unix Programming FAQ.  :-)

    6.5 How can I generate a stack dump from within a running program?
    http://www.faqs.org/faqs/unix-faq/programmer/faq/

It works surprisingly often, i.e. the process is healthy enough to run
system(3).

-- 
Cheers, Ralph.