one keyboard input problem:
my user space program wants to do two things:
E1. read data from one fifo and display it;
E2. Check if there is input from keyboard, if there is then handle it,
otherwise do nothing.
E1 should always be in execution, while E2 is event driven (when I input
something it should be capable of detecting and handling.)
how to implement this with C language? Is there any C lib function which
checks if there is input from keyboard or not?
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