Kill process that raises Device or resource busy: '/dev/ttyUSB0'?

Question

I connect to my Arduino board with the following Python code.

device=glob.glob(\"/dev/ttyUSB*\")[0]
time.sleep(1)
arduino = serial.Serial(device, 115200, timeout         


        

Answer 1

You can use

$ fuser /dev/ttyUSB0

to list the PIDs of the processes using the file. Alternatively, if your fuser command supports it you can use the -k option to kill them.

Answer 2

Run:

$ ps ax

You will see what process is using serial port. Kill that process. This solved it for me.

Answer 3

In my case

$ fuser /dev/ttyUSB0

was not working (it showed nothing).

What was working, however, was the following:

$ sudo lsof /dev/ttyUSB0

This gave me a list of the processes that were using my serial port and I could simply kill them using the PID (corresponding to the second column in the list).