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From: zandro_arceo AT support DOT trendmicro DOT com (IeperNaum)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Try this...
Date: 5 Mar 2002 20:13:47 -0800
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To: djgpp AT delorie DOT com
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"Joel Saunders" <jbs30000 AT aol DOT com> wrote in message news:<65f8aa920cde3ff34e24773b5831c770 DOT 62691 AT mygate DOT mailgate DOT org>...
> #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 */
> }

this is a followup to the email i sent prior to this one.

this is my code.

void int2f(_go32_dpmi_registers* r)
{
  printf("INT 2F Invoked r->h.ah = %X\r\n", r->h.ah);

  if (r->h.ah != 0x11)
  {
    printf("Do Control\r\n", r->h.ah);
    //other processing here
    return;
  }

}

 int main(int argc, char* argv[])
 {
   _go32_dpmi_seginfo info;
   _go32_dpmi_seginfo old_vector;

   _go32_dpmi_get_real_mode_interrupt_vector(0x2f, &old_vector);
   info.pm_offset = (unsigned long)int2f;
   _go32_dpmi_allocate_real_mode_callback_iret(&info, &g_r);
   _go32_dpmi_set_real_mode_interrupt_vector(0x2f, &info);

   _write(2,"Installing TSR\r\n",16);
   //__djgpp_exception_toggle(); 	// Only needed if exceptions linked

   __dpmi_regs r;
   r.x.ax = 0x3100;
   r.x.dx = 256 / 16;		// paragraphs
   __dpmi_int(0x21, &r);

   printf("Hey\n");

   _go32_dpmi_set_real_mode_interrupt_vector(0x2f, &old_vector);
   _go32_dpmi_free_real_mode_callback(&info);

 }

if i replace int 2f with int 21, it works. 'g_r' is global. 

another question:

even if i use int 21, if i remove the last two lines so that my
program would stay resident, the program just hangs. it does not even
print 'Hey'. what could be wrong?


thansk...