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* 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
* 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 an assembly
* language mouse interrupt handler. We use assembly language
* as it must be a far function and should swap to a local
* 32 bit stack if it is going to call any C based code (which
* we do in this example).
* Functions tested: PM_installMouseHandler()
* PM_int86()
#include <stdlib.h>
#include <stdio.h>
#include "pmapi.h"
volatile long count = 0;
#pragma off (check_stack) /* No stack checking under Watcom */
void PMAPI mouseHandler(
uint mask,
uint butstate,
int x,
int y,
int mickeyX,
int mickeyY)
mask = mask; /* We dont use any of the parameters */
butstate = butstate;
x = x;
y = y;
mickeyX = mickeyX;
mickeyY = mickeyY;
int main(void)
RMREGS regs;
PM_lockHandle lh;
printf("Program running in ");
switch (PM_getModeType()) {
case PM_realMode:
printf("real mode.\n\n");
case PM_286:
printf("16 bit protected mode.\n\n");
case PM_386:
printf("32 bit protected mode.\n\n");
} = 33; /* Mouse function 33 - Software reset */
if (regs.x.bx == 0) {
printf("No mouse installed.\n");
/* Install our mouse handler and lock handler pages in memory. It is
* difficult to get the size of a function in C, but we know our
* function is well less than 100 bytes (and an entire 4k page will
* need to be locked by the server anyway).
if (!PM_setMouseHandler(0xFFFF, mouseHandler)) {
printf("Unable to install mouse handler!\n");
printf("Mouse handler installed - Hit any key to exit\n");
printf("Mouse handler was called %ld times\n", count);
return 0;