LinuxQuestions.org - ioperm() problem

Hello

I need to work out some parallel port output signals.

I found a short program to test bits on that port.
It tells I need to set the permission with ioperm() as this:

Code:

#include <asm/io.h>

#include <iostream>

#include <cstdlib>

#include <unistd.h>



#define base 0x378          /* printer port base address */

#define value 255            /* numeric value to send to printer port */



using namespace std;



main(int argc, char **argv)

{

  if (ioperm(base,1,1))

    fprintf(stderr, "Couldn't get the port at %x\n", base), exit(1);



  outb(value, base);

}

but when i try to compile it reports error:
`ioperm' undeclared (first use this function)

help pls.