[gentoo-user] how to find if a program is using a particular /dev device?

[michael]

I have a custom device driver in /dev/ that can only be used by one
program at a time. Since the device is /dev/ttyUSB0, I can see if anyone
is using it by:

        ls -l /proc/*/fd/* | grep ttyUSB0

Is there a utility or other better way I can discover which process, or
better, which program, is using a particular device?

Thanks,
Michael
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