Another Parallel-Port thread

[KeTZer]

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:

#include <stdio.h>

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

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...

[KeTZer]

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

#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);
}