🚀 go-pugleaf

In article <1992Jul28.071823.26750@Informatik.TU-Muenchen.DE>, listl@Informatik.TU-Muenchen.DE (Andreas Listl) writes:
|> 
|> Hello,
|> 
|> I am looking for a TSR-Program (TSR = Terminate and stay resident) which 
|> prevents the computer of beeing booted, if someone presses Ctrl-Alt-Delete.
|> A small C-Program would be fine.
|> 

How about a small C-- program:

/*
    Title:  NOBOOT.C--
    Description:  A small TSR program that disables the <CTRL><ALT><DEL> reboot.
    Run File Size:  254 bytes.
*/


?include "KEYCODES.H--"

word oldkeyhandle[2]={};
byte altflag=0,ctrlflag=0;

?define s_upctrl s_ctrl+128
?define s_upalt  s_alt+128


interrupt keyhandle ()
{
$ PUSH DS
$ PUSH AX
DS = CS;
$ IN AL,KEYBOARD_PORT
IF( AL == s_alt )
    altflag = 1;
ELSE IF( AL == s_ctrl )
    ctrlflag = 1;
ELSE IF( AL == s_upalt )
    altflag = 0;
ELSE IF( AL == s_upctrl )
    altflag = 1;
ELSE IF( AL == s_del )
    IF( ctrlflag == 1 )
        IF( altflag == 1 )
            {@ EATKEY();
            @ EOI();
            $ POP AX
            $ POP DS
            return();
            }
$ POP AX
$ POP DS
$ JMP FAR CSWORD[#oldkeyhandle]
}


main ()
{
@ WRITESTR("NOBOOT installed.  <CTRL><ALT><DEL> is now disabled.\n");
@ GETINTVECT(#oldkeyhandle,KEYBOARD_INT);
@ SETINTVECT( ,KEYBOARD_INT,CS,#keyhandle);
@ KEEP( , , ,#main);
}

/* end of NOBOOT.C-- */


C-- is a low level language that is a mix between C and 8086+ assembly.
C-- is currently Pre-Beta, and the Pre-Beta version is currently available
as FreeWare.  Since it is still Pre-Beta, it is not widely distributed as
yet.  I can send you a ZIP of it if you wish, that is if we work out a way
to get the ZIP to you.

I don't know how large the resident code is of the TSR, but my guess is
under 220 bytes, not too bad.

        SPHINX


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=== Kill others only if you wish to be killed.   ===
===                                       SPHINX ===   
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