Path: utzoo!attcan!uunet!snorkelwacker!apple!rutgers!aramis.rutgers.edu!paul.rutgers.edu!sparky.rutgers.edu!gaynor
From: gaynor@sparky.rutgers.edu (Silver)
Newsgroups: comp.lang.c
Subject: Re: Catching ^C and ^Z
Message-ID: <Sep.5.01.20.23.1990.18603@sparky.rutgers.edu>
Date: 5 Sep 90 05:20:25 GMT
References: <Sep.4.20.08.17.1990.1216@utopia.rutgers.edu> <29167@netnews.upenn.edu>
Organization: Rutgers Univ., New Brunswick, N.J.
Lines: 17

deen@utopia.rutgers.edu:
> [I wanna write a lockscreen.]

weisen@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.

Regards, [Ag]