linux - Detect if an open file/device has been replaced/deleted -


assume following situation under linux:

a process continuously reading usb-serial converter device (/dev/ttyusb0). device suddenly unplugged , plugged in again (or resetting reason). process continues have valid file handle /dev/ttyusb0 won't receive data device unless process re-opens device (because udev has deleted , re-created device node).

is there direct way detect such situation (ie. not indirectly detecting timeout in data flow) process knows has re-open device? reliable monitor modification time of /dev/ttyusb0 using stat()?

additional details:

the process opens device file using standard open() function.

/dev tmpfs controlled udev.

note: not want use udev rules , prefer solution implemented directly in process.

if usb device hot-unplugged, operations on device begin failing -eio; can detect , take appropriate action.


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