From 7e0f021a9aec35fd8e6725e87e3313b101d26f5e Mon Sep 17 00:00:00 2001
From: Tobias Klauser <tklauser@distanz.ch>
Date: Sun, 27 Jan 2008 11:37:44 +0100
Subject: Initial import (2.0.2-6)

---
 reference/C/CONTRIB/SNIP/noreset.c | 103 +++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100755 reference/C/CONTRIB/SNIP/noreset.c

(limited to 'reference/C/CONTRIB/SNIP/noreset.c')

diff --git a/reference/C/CONTRIB/SNIP/noreset.c b/reference/C/CONTRIB/SNIP/noreset.c
new file mode 100755
index 0000000..f8ff751
--- /dev/null
+++ b/reference/C/CONTRIB/SNIP/noreset.c
@@ -0,0 +1,103 @@
+/* code to disable <Ctrl><Alt><Del>.                                */
+/* Compiled and tested under TC++ and MSC 6                         */
+
+#include <dos.h>
+#include <conio.h>
+
+#if defined(__TURBOC__)
+ #define _interrupt interrupt
+ #define _far far
+#else                              /* i.e. if MSC                   */
+ #define inportb(port) inp(port)
+ #define outportb(port,val) outp(port,val)
+ #define enable() _enable()
+ #define disable() _disable()
+ #define getvect(int) _dos_getvect(int)
+ #define setvect(int,ptr) _dos_setvect(int,ptr)
+ unsigned char peekb(unsigned seg, unsigned ofs)
+ {
+         unsigned char far *ptr;
+
+         FP_SEG(ptr) = seg;
+         FP_OFF(ptr) = ofs;
+         return *ptr;
+ }
+#endif
+
+#define CTRLALT        (0x08|0x04) /* bit flags set in kbstat()     */
+#define DELSCAN        0x53        /* keyboard scan code for <Del>  */
+#define KEYPORT        0x60        /* keyboard scan code port       */
+#define CONTROLLERPORT 0x20        /* interrupt controller port     */
+#define kbstat()       peekb(0,0x417)  /* BIOS data area - kb flags */
+
+#define keyport()      inportb(KEYPORT)
+        /* macro that returns the scancode of the key that caused   */
+        /* the interrupt                                            */
+
+#define install()      (oldkbisr=getvect(0x09),setvect(0x09,newkbisr))
+        /* installation macro, installs newkbisr() in the keyboard  */
+        /* interrupt chain                                          */
+
+#define uninstall()       setvect(0x09,oldkbisr)
+        /* removal macro, call to remove newkbisr() from interrupt  */
+        /* chain.  oldkbisr()  must be removed before program ends  */
+
+void (_interrupt _far * oldkbisr)(void);
+        /* address of old keyboard ISR                              */
+
+void _interrupt _far newkbisr(void)
+{
+   if((keyport()==DELSCAN)&&((kbstat()&CTRLALT)==CTRLALT))
+   {
+       char kbin = (char)inportb(KEYPORT+1);      /* reset keyboard */
+
+       outportb(KEYPORT+1, kbin|0x80);
+       outportb(KEYPORT+1, kbin);
+       disable();
+       outportb(CONTROLLERPORT,0x20); /* tell controller to shut up */
+       enable();
+   }
+   else
+       oldkbisr();  /* chain to old keyboard isr */
+}
+
+#ifdef TEST
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <conio.h>
+#include <signal.h>
+#include <errno.h>
+
+void main(void)
+{
+      int ch = 0;
+      void cleanup(void), cbrk(int);
+
+      install();
+      atexit(cleanup);
+
+      signal(SIGINT, cbrk);
+
+      puts("This is a test of Ctrl-Alt-Del disabling.");
+      puts("Press any key, but only Esc should stop this program.");
+
+      while (0x1b != ch)
+      {
+            if (kbhit)
+                  ch = getch();
+      }
+}
+
+void cbrk(int sig)
+{
+      signal(SIGINT, SIG_IGN);
+      signal(SIGINT, cbrk);
+}
+
+void cleanup(void)
+{
+      uninstall();
+}
+
+#endif
-- 
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