Date: Tue, 26 Sep 2000 17:59:28 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: computerboy <computerboy AT sina DOT com>
cc: djgpp AT delorie DOT com
Subject: Re: how hook int 21h from protect mode!
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On Thu, 14 Sep 2000, computerboy wrote:

> hi, please help me , I'm new for djgpp, I want hook real mode int 21h 
> at protect mode , I use a source from mailing list - test.c, but 
> my pc hung, call_dos() seem reenter! can u give a simple and  complete 
> code for hook 21h!
[snip]
>  >static
>  >void call_dos(_go32_dpmi_registers *r)
>  >{
>  > r->x.cs = old_int21_vector.rm_segment;
>  > r->x.ip = old_int21_vector.rm_offset;
>  > _go32_dpmi_simulate_fcall_iret(r);
>  >}

This function should zero r->x.ss, r->x.sp, and r->x.flags, before
calling _go32_dpmi_simulate_fcall_iret.