/*
 * Compile with `gcc -O2 [...]'.
 */

#include <stdio.h>
#include <unistd.h>
#include <asm/io.h>

#define BASEPORT 0x278 /* lp2 */
/*#define BASEPORT 0x378 /* lp1 */

int main()
{
  /* Get access to the ports */
  if (ioperm(BASEPORT,3,1)) {perror("ioperm");exit(1);}
  
  /* Set the data signals (D0-7) of the port to all low (0) */
  outb(0,BASEPORT);
  
  /* Sleep for a while (1000 ms) */
  usleep(1000000);
  
  /* Read from the status port (BASE+1) and display the result */
  printf("status: %d\n",inb(BASEPORT+1));

  /* We don't need the ports anymore */
  if (ioperm(BASEPORT,3,0)) {perror("ioperm");exit(1);}

  exit(0);
}

/* end of io-example.c */