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#include <stdio.h>
#include <unistd.h>
#include </usr/src//linux-headers-2.6.26-2-686/include/asm-x86/io.h>
#include <string.h>
// To jest adres portu równoległego w systemie
#define BASEPORT 0x278
// 0x278
// 0x0378 <-- to niby lp1
// 0x03bc <-- to niby lp0
int main(argc, argv)
int argc;
char **argv;
{
char *i;
  // Przejmujemy kontrolę nad portem. Program musi być uruchomiony przez roota.
  //albo przynajmniej miec SUIDa ustawionego
  //chmod 4755 plik
if (ioperm(BASEPORT, 3, 1)) { perror("ioperm"); exit(1); }
i = argv[1];
outb(i, BASEPORT);
// Zwolnij kontrolę nad portem.
if (ioperm(BASEPORT, 3, 0)) { perror("ioperm"); exit(1); }
exit(0);
}

wiadro:~# gcc  lpt.c
In file included from lpt.c:3:
/usr/src//linux-headers-2.6.26-2-686/include/asm-x86/io.h:17: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘*’ token
lpt.c: In function ‘main’:
lpt.c:18: warning: incompatible implicit declaration of built-in function ‘exit’
lpt.c:20: warning: passing argument 1 of ‘outb’ makes integer from pointer without a cast
lpt.c:22: warning: incompatible implicit declaration of built-in function ‘exit’
lpt.c:23: warning: incompatible implicit declaration of built-in function ‘exit’