Catching ^C and ^Z

[Stanley Friesen]

In article <Sep.5.01.20.23.1990.18603 at sparky.rutgers.edu> gaynor at sparky.rutgers.edu (Silver) writes:
>weisen at eniac.seas.upenn.edu:
>> Under BSD, you should be able to do something like:
>>        signal(SIGINT,SIG_IGN);
>>        signal(SIGQUIT,SIG_IGN);
>> to IGNore the signals.
 
>SunOS signal(3):
>> SIGKILL   9    kill (cannot be caught, blocked, or ignored)
>> SIGSTOP   17   stop (cannot be caught, blocked, or ignored)
 
>Therein lies the incentive to capture the characters before a shell can see
>them.

Except that this is totally irrelevant.  SIGKILL and SIGSTOP *cannot* be
generated by any keystroke sequence on a terminal!  They may *only* be generated
by software means, such as kill(1) or kill(2).  In addition only the owner of
the process and the superuser are allowed to do this, so they do *not* effect
the security of a lock program.
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uunet!tdatirv!sarima				(Stanley Friesen)
						(Teradata Corporation)
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