#include <stdio.h>
#include <stdlib.h>
#include <asm/io.h>
#include <signal.h>

// priklad pro pripojeni wdt1LPT na port LPT1
#define BASEPORT 0x378
// pokud ma byt port LPT2 - dat adresu 0x278

static int end;
static short int lpstat;

static void endme(int dummy) { end=1; }

int main(int argc, char **argv) {

if (ioperm(BASEPORT, 3, 1)) { // pozadame system o moznost zapisu na LPT1 (0x378)
perror("ioperm open");
exit(1);
}

signal(SIGINT, endme);
inb(BASEPORT, lpstat);        // nactu stav portu
lpstat = (lpstat ^ 1) | 254;  // nejnizsi bit invertuju, ostatni nastavim do log.1
outb(lpstat, BASEPORT);       // zapis nove hodnoty na port 
outb(0, BASEPORT + 2);        // STROBE=0 - nepovinny prikaz, wdt1LPT nevyuziva, pouze typ wdt2LPTS
outb(2, BASEPORT + 2);        // nastaveni STROBE=1 na portu - ukonceni zapisu

freeperm();                   // ukonceni pristupu k LPT a predani systemu
exit(0);
}

int freeperm() {
if (ioperm(BASEPORT, 3, 0)) { perror("ioperm close"); }
}