From:	Erik Rull <erik_rull AT bluewin DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Still problems with protected_mode_int
Date:	Wed, 12 Jan 2000 15:55:02 +0100
Organization:	tesion Communikationsnetze Suedwest GmBH & Co.KG, Stuttgart, Germany
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Hi,

I've tried your solution with _my_cs(), but it still doesn't do what I
want...
In plain DOS, the timer_handler() is not called. I don't get the output
of printf().
When I run it from a DOS Box in W95, it works.
Where could the problem be??

Here is my last Mail with the corrected programms:

First I wrote a programm that increases a timer variable when the
timer-int occurs. Then I inserted a system() call that calls another
programm, with the active timer-int.
To make it easier for you, I'll add the sources of the programms to this
mail.
Thanks for helping me!

The programm that contains the system() call:

#include <pc.h>
#include <dpmi.h>
#include <stdio.h>

     volatile int tics = 0;

     void timer_handler()
     {
       printf("Tics passed: %d\n",++tics);
     }

     int main()
     {
       _go32_dpmi_seginfo old_handler, new_handler;

       printf("grabbing timer interrupt\n");
       _go32_dpmi_get_protected_mode_interrupt_vector(8, &old_handler);

       new_handler.pm_offset = (int) timer_handler;
       new_handler.pm_selector = _go32_my_cs();
       _go32_dpmi_chain_protected_mode_interrupt_vector(8,
&new_handler);

       getkey();
       system("timer3.exe");

       printf("releasing timer interrupt\n");
       _go32_dpmi_set_protected_mode_interrupt_vector(8, &old_handler);
       printf("Time : %d",tics);

       return 0;
     }

The programm called by system():

#include <stdio.h>

main()
{
        printf("Timer3.exe is running!\n");
}

P.S. I'm still using version 2.6.3 (1.12 maint3), because no other
works...

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