From:	Vladimir Pshenkin <PSHENKIN AT main DOT econ DOT msu DOT su>
Organization:	MSU Faculty of Economics
To:	djgpp AT sun DOT soe DOT clarkson DOT edu
Date:	Mon, 3 Apr 1995 15:06:01 +0300
Subject:	Help with CtrlBreak !!!

I can`t disable standard Ctrl-Break handling in my programm.
Please help!!!


#include <grx.h>
#include <stdio.h>
#include <stdlib.h>
#include <dir.h>
#include <ctype.h>
#include <dos.h>
#include <go32.h>
#include <pc.h>
#include <dpmi.h>

.....

_go32_dpmi_registers    regs;

void CBrkHandler(_go32_dpmi_registers *r){
    GrSetContext(NULL);
    GrLine(0,0,GrScreenX(), GrScreenY(), GrWhite());
    usleep(1000000);
    memset(r, 0, sizeof(*r));
}

static _go32_dpmi_seginfo   oldvector;
static _go32_dpmi_seginfo   info;
static _go32_dpmi_seginfo   poldvector;
static _go32_dpmi_seginfo   pinfo;

void Done0x23(void){
    _go32_dpmi_set_real_mode_interrupt_vector(0x23, &oldvector);
    _go32_dpmi_free_real_mode_callback(&info);
/*
    _go32_dpmi_set_protected_mode_interrupt_vector(0x23, &poldvector);
    _go32_dpmi_free_iret_wrapper(&pinfo);
*/
}

#define DD(s, x)    printf("%s:%d\n", s, x), usleep(1000000)
/* ------------ initialize the message system --------- */
int StartFunc( int fd ){

    atexit(WinTermFunc);

    GrSetMode(gmode, wdth, hght, nclr);

    if( !MouseDetect() ){
        return FALSE;
    }

/***************************
    Here initializes event queue (from LIBGRX)
*/
    if( !WinInit(fd) ) return FALSE;

    
/**************************
    Here initializes CtrlBreak handling
*/
    DD("start", 0);
    DD("grmiv", _go32_dpmi_get_real_mode_interrupt_vector(0x23, 
&oldvector));

    info.pm_offset = (long) CBrkHandler;
    DD("armci", _go32_dpmi_allocate_real_mode_callback_iret(&info, 
&regs));
    DD("srmiv",_go32_dpmi_set_real_mode_interrupt_vector(0x23, 
&info));

/*
    DD("gpmiv", _go32_dpmi_get_protected_mode_interrupt_vector(0x23, 
&poldvector));

    pinfo.pm_offset = (long) CBrkHandler;
    DD("aiw", _go32_dpmi_allocate_iret_wrapper(&pinfo));
    DD("spmiv", _go32_dpmi_set_protected_mode_interrupt_vector(0x23, 
&pinfo));
*/
    setcbrk(0);
    _go32_want_ctrl_break(1);

    atexit(Done0x23);
...
    return TRUE;
} /* StartFunc */

.....

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