[Info-vax] How dangerous is it to be able to get into DCL supervisor mode

[Robert A. Brooks]

On 7/5/2017 1:42 PM, Bob Koehler wrote:
> In article <ojj3gf$ola$1 at dont-email.me>, David Froble <davef at tsoft-inc.com> writes:
>>
>> My memory, remember, we're talking over 30 years, is that if the conditions for
>> an exception handler were met, whatever they are, then the exception handler(s)
>> will be invoked.
> 
>     There are many situations in which VMS will skip user mode handlers.
> 
>     For example, if you stop a process with STOP, user mode handlers get
>     skipped.  We had a utility program that would do a force exit on the
>     process instead.

Which is why folks will frequently use an image rundown handler, which is created
by calling img$add_privileged_vector_entry().  See the Internal and Data Structures
manual for details.

-- 

                       -- Rob