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Conference noted::hackers_v1

Title:	-={ H A C K E R S }=-
Notice:	Write locked - see NOTED::HACKERS
Moderator:	DIEHRD::MORRIS

Created:	Thu Feb 20 1986
Last Modified:	Mon Aug 03 1992
Last Successful Update:	Fri Jun 06 1997
Number of topics:	680
Total number of notes:	5456

393.0. "Need help to emulate "power-fail"." by 42413::KOSKUBA (Karel_the_cotton_fist) Fri Jan 30 1987 10:36

I need help emulating power_fail in a VAX (BASIC) program. I need my program to 
fail without closing files. The only way I know how to do it is to pull the 
plug out. That is too time consuming - so can anyone think of a way to crash my 
program bypassing the normal exception handlers?
Thanks - Karel.

T.R	Title	User	Personal Name	Date	Lines
393.1	Perhaps SYS$DELPRC is good enough?	BISTRO::HEIN	If We don't Have it,You don't Need it!	`Fri Jan 30 1987 11:12`	1

393.2		CHOVAX::YOUNG	Back from the Shadows Again,	`Sat Jan 31 1987 17:45`	6
	Re .1: I think that it used to be good enough, but that it was 'fixed' so that it flushes & closes files for you. I'm not certain though. -- Barry
393.3	EXEC mode crash?	CHOVAX::YOUNG	Back from the Shadows Again,	`Sat Jan 31 1987 17:57`	31
	On thinking about this some more, I now believe that you could get what you want with an EXEC mode bugcheck. This will cause your process to be deleted, and will probably result in not closing your files. Add the following code to your BASIC program at the appropiate place: . . External long by_bugcheck . . Call sys$cmexec (by_bugcheck, ) . . Now, LINK with the following subroutine: 1 Subroutine by_bugcheck (long bad_argument) Bad_argument = 1% End This should crash & burn very nicely. -- Barry
393.4	DCL STOP?	BCSE::BULKA	nick bulka	`Mon Feb 02 1987 09:30`	1
	Why can't you just log in again and stop the process from DCL?
393.5	Crash VMS!	HOW::EVANS	Robert N. Evans DTN-225-6946 HLO2-3/P4	`Mon Feb 02 1987 13:44`	11
	Any way you choose to stop the process and leave VMS running, as suggested above allows VMS to potentially do some cleanup for you. Doing something that actually crashes VMS will prevent this cleanup. How about calling (from BASIC) a kernel-mode Macro routine which simply halts the CPU? On most VAX models, the console can be set to provide an automatic reboot. It is their problem if you have other users on your VAX ;-). Seriously, this method should mimic a powerfail provided that there is no battery-backup provided restart. In the case of a restart, an application should not be able to detect that the power failed.
393.6	I'm happy now.	42413::KOSKUBA	Karel_the_cotton_fist	`Wed Feb 04 1987 08:13`	5
	Thanks to all contributors. I have so far tried only sys$delprc and it works OK for what I want. I'll try the other suggestions in due course (apart from crashing VMS - that's what I want to avoid). Thanks again, Karel.