[NEWBIE] Is it legal for open() to return -EBUSY?

In LDD3, Chapter 6, Section "Restricting Access to a Single User at a Time", the example code returns -EBUSY when the chardev is in use by another user. However, I "man 3p open" and "man 2 open", finding that ERRORS section of either manual didn't mention about EBUSY.

I would like to ask if it's legal for open() to return -EBUSY.

Zheng Lv
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