Date: Wed, 16 Feb 2000 08:58:27 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender: eliz AT is
To: Marcus <mesthlm AT hem DOT passagen DOT se>
cc: djgpp AT delorie DOT com
Subject: Re: SV: System hangs when I exit my program
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On Wed, 16 Feb 2000, Marcus wrote:

> void uninitmouse(void)
> {
>   __dpmi_regs regs;
>   regs.x.ax = 0xC;
>   regs.x.cx = 0;
>   regs.x.es = 0;
>   regs.x.dx = 0;
>   _go32_dpmi_set_protected_mode_interrupt_vector(0x33, &old_mouse_handler);
>   _go32_dpmi_free_real_mode_callback(&mouse_handler);
>   ok_mouse = false;
> }

You need to call Int 33h before calling
_go32_dpmi_set_protected_mode_interrupt_vector to remove the hook.