altcrit.c

BIOS emulator and interface to Realmode X86 Emulator Library Can emulate a PCI Graphic Controller V

/****************************************************************************
*
*					SciTech OS Portability Manager Library
*
*  ========================================================================
*
*    The contents of this file are subject to the SciTech MGL Public
*    License Version 1.0 (the "License"); you may not use this file
*    except in compliance with the License. You may obtain a copy of
*    the License at http://www.scitechsoft.com/mgl-license.txt
*
*    Software distributed under the License is distributed on an
*    "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
*    implied. See the License for the specific language governing
*    rights and limitations under the License.
*
*    The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc.
*
*    The Initial Developer of the Original Code is SciTech Software, Inc.
*    All Rights Reserved.
*
*  ========================================================================
*
*
* Language:		ANSI C
* Environment:	any
*
* Description:  Test program to check the ability to install a C based
*				critical error handler.
*
*				Functions tested:	PM_installCriticalHandler()
*									PM_criticalError()
*									PM_restoreCriticalHandler()
*
*
****************************************************************************/

#include <stdlib.h>
#include <stdio.h>
#include "pmapi.h"

volatile uint criticalError = false;
volatile uint axValue;
volatile uint diValue;

#pragma off (check_stack)			/* No stack checking under Watcom	*/

uint PMAPI criticalHandler(uint axVal,uint diVal)
{
	criticalError = true;
	axValue = axVal;
	diValue = diVal;
	return 3;		/* Tell MS-DOS to fail the operation */
}

int main(void)
{
	FILE	*f;

	printf("Program running in ");
	switch (PM_getModeType()) {
		case PM_realMode:
			printf("real mode.\n\n");
			break;
		case PM_286:
			printf("16 bit protected mode.\n\n");
			break;
		case PM_386:
			printf("32 bit protected mode.\n\n");
			break;
		}

	PM_installAltCriticalHandler(criticalHandler);
	printf("Critical Error handler installed - trying to read from A: drive...\n");
	f = fopen("a:\bog.bog","rb");
	if (f) fclose(f);
	if (criticalError) {
		printf("Critical error occured on INT 21h function %02X!\n",
			axValue >> 8);
		}
	else
		printf("Critical error was not caught!\n");
	PM_restoreCriticalHandler();
	return 0;
}