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From: "Joel Saunders" <jbs30000 AT aol DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Try this...
Date: Tue, 5 Mar 2002 17:53:03 +0000 (UTC)
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#include <sys/farptr.h>
#include <stdio.h>
#include <crt0.h>
#include <dpmi.h>
#include <go32.h>
unsigned char SChar;
int _crt0_startup_flags = _CRT0_FLAG_LOCK_MEMORY;
static __dpmi_regs callback_regs;
static _go32_dpmi_seginfo info;
void Int_2F_Handler(_go32_dpmi_registers *r);
main()
{
        unsigned short Offset, Segment;
        Offset = _farpeekw(_dos_ds, 0xBC);
        Segment = _farpeekw(_dos_ds, 0xBD);
        printf("\nOld 0DH Segment%X\nOld 0DH Offset%X\n", Segment,
Offset);
        __dpmi_regs r;
        info.pm_offset = (long)Int_2F_Handler;
        _go32_dpmi_allocate_real_mode_callback_iret(&info,
&callback_regs);
        _go32_dpmi_set_real_mode_interrupt_vector(0x2F, &info);
        r.x.ax = 0x252F;
        r.x.ds = info.rm_segment;
        r.x.dx = info.rm_offset;
        __dpmi_int(0x21, &r);
        Offset = _farpeekw(_dos_ds, 0xBC);
        Segment = _farpeekw(_dos_ds, 0xBD);
        printf("\nNew 0DH Segment%X\nNew 0DH Offset%X\n", Segment,
Offset);

        /*   __djgpp_exception_toggle(); */     /* Only needed if
exceptions linked */
        r.x.ax = 0x3100;
        r.x.dx = 16;
        __dpmi_int(0x21, &r);
}
void Int_2F_Handler(_go32_dpmi_registers *r)
{
/* Your code here */
}


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