Category : C Source Code
Archive   : C-ALL.ZIP
Filename : TI711.ASC

 
Output of file : TI711.ASC contained in archive : C-ALL.ZIP







PRODUCT : Borland C++ NUMBER : 711
VERSION : 2.0
OS : DOS
DATE : September 18, 1991 PAGE : 1/2

TITLE : Disabling CTRL-BREAK and CTRL-C





/**********************************************************

The following code shows how to disable CTRL-BREAK and
CTRL-C.

************************************************************/

#include
#include
#include

char far *modifiers = MK_FP(0,0x417); /* address of modifier
flags */
void interrupt (*oldint9) (void); /* storage for old INT 9
handler */

void interrupt myint9(void)
{
/* ((*modifiers)&4)==4 indicates the CTRL key is being pressed

inportb(0x60)==46 indicates the C key is being pressed
inportb(0x60)==70 indicates the SCROLL LOCK/BREAK key "

The emit code is required to clean the keypress up from

the BIOS.
*/

if( (((*modifiers)&4)==4) &&
((inportb(0x60)==46) || (inportb(0x60)==70)) )
__emit__(0xe4,0x61, /* asm IN AL,61 */
0x8a,0xe0, /* asm MOV AH,AL */
0x0c,0x80, /* asm OR AL,80 */
0xe6,0x61, /* asm OUT 61,AL */
0x86,0xe0, /* asm XCHG AL,AH */
0xe6,0x61, /* asm OUT 61,AL */
0xb0,0x20, /* asm MOV AL,20 */
0xe6,0x20); /* asm OUT 20,AL */
else
/* If the key is not CTRL-C or CTRL-BREAK, call the old INT 9
handler */
oldint9();













PRODUCT : Borland C++ NUMBER : 711
VERSION : 2.0
OS : DOS
DATE : September 18, 1991 PAGE : 2/2

TITLE : Disabling CTRL-BREAK and CTRL-C




}

void exitfunc(void)
{
/* Restore the old INT 9 handler */
setvect(9,oldint9);
}

main()
{
int i;

oldint9=getvect(9); /* store old interrupt vector */
setvect(9,myint9); /* set up new interrupt handler */
atexit(exitfunc); /* set up exit handler to restore INT 9*/

/* ... */ /* code that will not CTRL-BREAK or CTRL-C */

return 0;
}































  3 Responses to “Category : C Source Code
Archive   : C-ALL.ZIP
Filename : TI711.ASC

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

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