[ts-7000] Detecting plugging in of a USB-to-serial device in a running C program?

["bburtan65" <>]

Let's say you're running a C program you've written that among other things can 
talk to an FTDI USB-to-Serial device.  However, that device might not always be 
present.  What's the best way to detect that the device has been plugged in?  
Hotplug doesn't seem appropriate or am I not understanding how it works?  A 
brute force approach would be to periodically attempt to fopen the tty device 
name but that seems kludgey to me.  And then there's the question of what to do 
in the C code when the device has been unplugged.  Again brute force might be 
to attempt to talk to if and if you get an error, go back to fopen polling for 
the device.




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