#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>			/* for usleep */
#include <sys/io.h>			/* for inb,outb */


static void beep_on(void)
{
    outb(inb(0x61)|3, 0x61);	/* beep on */
}

static void beep_off(void)
{
    outb(inb(0x61)&0xfc, 0x61);	/* beep off */
}


int main(int argc, char *argv[])
{
    uint32_t count;

    if ((ioperm(0x0040, 4, 1)) || (ioperm(0x0061, 1, 1))) {
        perror("ioperm");
        return 1;
    }

    count = 1193180/1000;		/* 1000 Hz */
    outb(0xb6, 0x43);			/* set freq */
    outb(count & 0xff, 0x42);
    outb((count>>8) & 0xff, 0x42);

    beep_on();
    usleep(1000000);			/* 1sec wait */
    beep_off();

    return 0;
}