read from parallel port

[Fa6om]

Hi all
I need to write a program in C that reads 4 switches from the parallel port and display their status.
All the program does is display:
switch 1 is ON
switch 2 is OFF
switch 3 ...
The program is to run in linux kernel version 2.6

I started writing the program for one switch connected to the pin D0 of the parallel port, but i get a sigmentation failure message.

#include <stdio.h>
#include <stdlib.h>
#include <sys/io.h>

#define base 0x378
#define D0 0x01

int main (void)
{
if (inb(base & D0)
printf("Switch 1: ON");
else
printf("Switch 1: OFF");

return (0);
}


can anyone help me with the code?

thanks

[weaknessforcats]

You are missing a parenthesis in your if statement. What does the inb() function do? I've not seen that before.

[Fa6om]

Inb() function is to read the input from a parallel port

Pin D0 of the parallel port is connected to a switch. When the switch is ON (set to 1) I want the program to read ( 00000001 = 0x01 ) from the parallel port and display a message that switch 1 is on. For the second switch, it's connected to pin D1 and the program will read ( 00000010 = 0x02 ) and display the output message. And so on....

I may not use Inb() function in the right format, as you mentioned it's missing a parameter, can you please correct me?

thanks a lot for you're help.

[weaknessforcats]

Sorry, but I've not used that function. It looks like Linux and I am a Windows person.

I did a Google on inb containing the words parallel and port and got 10,800 web pages. You will have to go it yourself from here.

That is, unless anyone else can help further.