Q:

Access Keystrokes in C

I am trying to access keystrokes in C. I can access alphanumeric keys. How can I access Control, Shift and Alt key? 

Plus I read somewhere that sometimes while entering text in console, OS masks backspace key. I would like to know where user pressed backspace key. It's not same as knowing when '\n' was pressed.
GNU C. Ubuntu 11. 

A:

Dietrich Epp answered in a comment: use ncurses library.
See also this question
And you might make an X11 client graphical application; in that case use a graphical toolkit library like GTK or Qt
If you want to make a console application, use ncurses or perhaps readline
And your question, when taken literally, has no sense: the strict C standard don't know what a key or a keystroke is (the only I/O operations mentioned in the standard are related to  <stdio.h> thru FILE). This is why most people uses additional libraries and standards (in addition of those required by ISO C), eg. Posix...

