怎樣用C實現模擬設備中斷？比如模擬鼠標移動，按鍵盤？

#include <stdio.h>

#include <dos.h>

#include <graphics.h>

union REGS regs;

int init();

int read();

void cursor(),newxy(),draw();

int xmin,xmax,ymin,ymax,x_max=639,y_max=479;

main()

{

int buttons,xm,ym,x0,y0,x,y;

char str[100];

int driver=VGA;

int mode=VGAHI;

initgraph(&driver,&mode,"D:\\tc");

rectangle(0,0,x_max,y_max);

setfillstyle(SOLID_FILL,BLUE);

bar(1,1,x_max-1,y_max-1);

outtextxy(3,15,"move mouse using any button.");

setfillstyle(1, RED);

bar(280, 12, 330, 33);

outtextxy(285,15,"quit");

bar(340, 12, 390, 33);

setfillstyle(SOLID_FILL,BLUE);

outtextxy(345,15,"clear");

xmin=2;

xmax=x_max-1;

ymin=8;

ymax=y_max-2;

setwritemode(XOR_PUT);

if(init(xmin,xmax,ymin,ymax)==0 )

{

printf("Mouse or Mouse Driver Absent,P1ease install!");

delay(5000);

exit(1);

}

x=320;

y=240;

cursor(x,y);

for(;;)

{

newxy(&x,&y,&buttons);

if(x>=280&& x<=330 &&y>=12&&y<=33&& buttons)

{

cleardevice();

exit(0);

}

if(x>=340 && x<=390 && y>=12 && y<=33 && buttons)

{

rectangle(0,0,x_max,y_max);

setfillstyle(SOLID_FILL,BLUE);

bar(1,1,x_max-1,y_max-1);

outtextxy(3,15,"move mouse using any button.");

setfillstyle(1, RED);

bar(280, 12, 330, 33);

outtextxy(285,15,"quit");

bar(340, 12, 390, 33);

outtextxy(345,15,"clear");

setfillstyle(SOLID_FILL,BLUE);

xmin=2;

xmax=x_max-1;

ymin=8;

ymax=y_max-2;

setwritemode(XOR_PUT);

if(init(xmin,xmax,ymin,ymax)==0 )

{

printf("Mouse or Mouse Driver Absent,P1ease install!");

delay(5000);

exit(1);

}

x=320;

y=240;

cursor(x,y);

}

}

}