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- Path: sparky!uunet!mcsun!uknet!axion!pcellik
- From: pcellik@axion.bt.co.uk (Peter SPHINX Cellik)
- Newsgroups: comp.sys.ibm.pc.misc
- Subject: Re: Suppress Booting by Ctrl-Alt-Delete
- Keywords: Booting, Ctrl-Alt-Delete
- Message-ID: <1992Jul29.092129@axion.bt.co.uk>
- Date: 29 Jul 92 08:21:29 GMT
- References: <1992Jul28.071823.26750@Informatik.TU-Muenchen.DE>
- Sender: news@axion.bt.co.uk
- Reply-To: pcellik@axion.bt.co.uk (Peter SPHINX Cellik)
- Organization: British Telecom Research Labs
- Lines: 84
-
-
- 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
-
-
- ====================================================
- === Kill others only if you wish to be killed. ===
- === SPHINX ===
- ====================================================
-