Parallel Port! Detect incoming current, posible?

Hello!
I have little knowledge about parallel port programming on Linux. I wan't to know if its possible to like 'listen' if the current is incoming into data pin? What I need is forexample I have two wires, one from Data pin 1 and other from ground, if I put them together some function will return for example 1 else 0! Does anybody know something about this function!? I think its called inb(); Thanx!

what you are going to need to do is "poll" the pins. This can be done in multiple ways, but if you want the simplest, just go with a while loop that reads data from those pins, then calls/does something when you recieve certain results.

Worth a read
http://www.lvr.com/parport.htm
http://www.torque.net/linux-pp.html