From owner-freebsd-hackers Fri Apr 21 09:30:58 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id JAA10627 for hackers-outgoing; Fri, 21 Apr 1995 09:30:58 -0700 Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.2.228.34]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id JAA10617 for ; Fri, 21 Apr 1995 09:30:43 -0700 Received: (from bde@localhost) by godzilla.zeta.org.au (8.6.9/8.6.9) id CAA26034; Sat, 22 Apr 1995 02:27:48 +1000 Date: Sat, 22 Apr 1995 02:27:48 +1000 From: Bruce Evans Message-Id: <199504211627.CAA26034@godzilla.zeta.org.au> To: bde@zeta.org.au, jgreco@brasil.moneng.mei.com Subject: Re: [DEVFS] your opinions sought! Cc: hackers@freefall.cdrom.com, pritc003@maroon.tc.umn.edu, rgrimes@gndrsh.aac.dev.com, terry@cs.weber.edu, wilko@yedi.iaf.nl Sender: hackers-owner@FreeBSD.org Precedence: bulk >> >Oh, how I wish for some way to just "pause" the OS sometimes. :-) It's >> >sooooo handy and convenient to just add a tape drive by just plugging it in. >> >> What's wrong with Ctrl-SysRq to enter ddb? >"ddb: No debugger in kernel" >Those of us running unattended production systems cannot afford to have a >machine crash into ddb, and not reboot. Otherwise, I'd agree... but right >now, I have to drive a half hour to go reboot systems that lock. This is easy to fix. E.g., replace Debugger() by a dummy version and put the old version in the keyboard driver alone, and maybe disable breakpoint and trace traps unless the debugger has been reached via the keyboard trap. >(by the way, this is one of the things that I hope serial consoles will buy >for me, but haven't gotten around to checking on it. Is there any >Ctrl-SysRq equivalent available on a serial console? BREAK?) BREAK, if it is enabled by a million ifdefs. Serial consoles have the same problem with automatic reboots. Bruce