Another Parallel-Port thread

I know that there are plenty of them already, but none did really help me.
Thing is, that I just want to set some of the data-lines high/low. I also spent the whole day searching with google, but I didn´t find the info I needed (or as easy as I would have needed).
So, I found out, that it would be best to use /dev/parport0 because it´s more low-level than lp0.
So far so good, but I only managed to open and close parport. I just didn´t find out which commands are used just to write binary in it. For example 1010 1010 - to set four data-lines high and four ones low.

Thats what I think I found out until now:

Code:

---

#include <stdio.h>

int main()
{
        int fd;
        fd = open("/dev/parport0");
        close(fd);
        return(0);
}

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Is that code right? What code line do I have to put in to set some data-lines?

Hope you can help me and don´t tell me to google or use search - I really tried...And yes I am a beginner...

Okay, I figured it out my self, it works like this:

Code:

---

#include <stdio.h>
#include <linux/parport.h>
#include <linux/ppdev.h>
#include <sys/ioctl.h>
#include <fcntl.h>


int main()
{
        int fd;
        int val;
        val = 0x81;
        fd = open("/dev/parport0", O_RDWR);
                if (fd < 0)
                {
                printf("Couldn´t open parport0");
                }
        ioctl(fd, PPEXCL);
        ioctl(fd, PPCLAIM);
        ioctl(fd, PPWDATA, &val);
        close(fd);
        return(0);
}

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