From: myknees AT aol DOT com (Myknees)
Newsgroups: comp.os.msdos.djgpp
Subject: help with possible Allegro bug
Date: 1 Mar 1998 16:59:03 GMT
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Message-ID: <19980301165901.LAA26810@ladder02.news.aol.com>
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References: <34F96E08 DOT 30BA57A5 AT cornell DOT edu>
Organization: AOL http://www.aol.com
To: djgpp AT delorie DOT com
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A while back this phenomenon was described in another thread but no one
responded.  Since then I've looked at Allegro's sources, trying to figure out
what's going on, but I have no clue why this is happenning.

When using a DOS box from Windows95, after running the program resulting from
the code listed below, typing "mem" consistently crashes my DOS box back to
Windows with the message:
"This program has performed an illegal operation and will be terminated.  Quit
all programs, and then restart your computer.
..and the "details" are:
"The program tried to execute an invalid instruction.  Fault location:
0E2D:5C2C  Interrupts in service: none."

If anyone can reproduce this phenomenon on their machine it may be worth
finding out why it happens, but I am stuck.  Here's the code:


#include <stdio.h>
#include <allegro.h>

int main(int argc, char *argv[])
{
    allegro_init();
    install_keyboard(); 
    install_timer();

    /* install a digital sound driver -- removing this eliminates the behavior
*/
    if (install_sound(DIGI_AUTODETECT, MIDI_NONE, argv[0]) != 0) {
      printf("Error initialising sound system\n%s\n", allegro_error);
      exit(1);
    }
    
    exit(0);
}

/*
gcc -O -Wall -o debug.exe debug.c -lalleg
*/