QNX LPT Port Programming

#include <stdio.h> 
#include
<unistd.h> /* for sleep() */ 
#include
<stdint.h> /* for uintptr_t */ 
#include
<hw/inout.h> /* for in*() and out*() functions
*/ 
#include <sys/neutrino.h> /* for ThreadCtl()
*/ 
#include <sys/mman.h> /* for mmap_device_io()
*/ 

/* The Neutrino IO port used here corresponds to a
single register, which is 
* one byte long
*/ 
#define PORT_LENGTH 1 

/* The
first parallel port usually starts at 0x378. Each parallel port
is 
* three bytes wide. The first byte is the Data
register, the second byte is 
* the Status register, the
third byte is the Control register. */ 
#define
DATA_ADDRESS 0x378 
#define CTRL_ADDRESS
0x37a 
/* bit 2 = printer initialisation (high to
initialise) 
* bit 4 = hardware IRQ (high to enable)
*/ 
#define INIT_BIT 0x04 

#define
LOW 0x00 
#define HIGH
0xFF 

#define MAX_COUNT
60 

/*
______________________________________________________________________
*/ 
int 
main(
) 
{ 
int
privity_err; 
uintptr_t
ctrl_handle; 
uintptr_t
data_handle; 
int count; 

/* Give
this thread root permissions to access the hardware
*/ 
privity_err = ThreadCtl( _NTO_TCTL_IO, NULL
); 
if ( privity_err == -1
) 
{ 
fprintf( stderr, "can‘t get root
permissions\n" ); 
return
-1; 
} 

/* Get a handle to the
parallel port‘s Control register */ 
ctrl_handle =
mmap_device_io( PORT_LENGTH, CTRL_ADDRESS ); 
/* Get a
handle to the parallel port‘s Data register */ 
data_handle
= mmap_device_io( PORT_LENGTH, DATA_ADDRESS ); 

for (
count = 0; count < MAX_COUNT; count++
) 
{
/* Output a byte of lows to the data
lines */ 
out8( data_handle,
LOW); 
out8( ctrl_handle, (LOW & 0x0f )
); 
printf( "Low\n" ); 
sleep( 1
); 

/* Output a byte of highs to the data lines
*/ 
out8( data_handle, HIGH ); 
out8(
ctrl_handle, (HIGH & 0x0f )); 
printf( "High\n"
); 
sleep( 1
); 
} 

return
0; 
}