How to interrupt a fread call?

Question

I have the following situation:

There is a thread that reads from a device with a fread call. This call is blocking as long as there is no data send from the device.

Answer 1

Take a look at man 2 kill. (Or see here)

I get the feeling that you don't want to do this, though--most of the time people ignore errno EINTR and read again. You might want to look into non-blocking reads instead.