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The device special file (/dev/usb/lp0) disappears after invoking lpinfo command several times #5762

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tangyanli opened this issue Mar 30, 2020 · 0 comments

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@tangyanli
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tangyanli commented Mar 30, 2020

My OS is Ubuntu 19.04 (CUPS version is 2.2.10)

When I plug my printer into computer by USB, the device special file (/dev/usb/lp0) appear. So I can connect with my printer by reading or writing the device special file.

But when I run lpinfo with option "-l - v " several times, the device special file disappears.
I re-plug the printer, and run cups usb backend like below many times. The device special file also disappers.

$./usb/lib/cups/backend/usb

Then I test above phenomenon on CentOS7.4 (CUPS version is 1.6.3), the device special file is always existent. Does the cupsv2.2.10 usb backend has some issue?

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