Parallel port programming in Linux (Ubuntu)

Hello Every one.

It is very simple to control the parallel port in linux in c. Just run this c program. Make sure you are logged in as a root.

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/io.h>
#define pport 0x378

main(int argc,char **argv)
{
unsigned long int i;
if (ioperm(pport,1,1))
    printf("Error: Couldn't get the port at %x\n", pport);

while(1){
 for(i=0;i<99999999;i++);
   outb(0xFF,pport);
   printf("\nON");
 for(i=0;i<99999999;i++);
   outb(0x00,pport);
   printf("OFF");
}
}

This program is for blinking a LED on any data bit of parallel port.

U can change the delay by changing the for loop conditions.

If some one is new to linux then here is some help, how to add root user...

type ' sudo passwd root ' on terminal then hit enter. it will ask password for root user two times, give the password and then login as a root.

enjoy...