function to detect keyboard hit

[shannon loi]

I'm writing an application using C language, in which
I have a while loop that run infinitely, only stop if
user hit 'q'on the keyboard. 
Does Linux C library has a function to detect keyboard
hit (like function _kbhit in Windows)?

While(1)
{   
    /* if user hit q */
    if( _kbhit() ) /* this is Windows function, 
                    how about in Linux? */
    {	/* Check for "q" to Quit */
	if( getchar()=='q')
	{ exit (1)}
    }
    /* do something ...... */
}
if there's no such a function in lib, how do you write
it to do the same thing?

Thanks.
-Shannon-

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