Side effects of open system call

[Rahul Bedarkar]

Hi,

In ioctl man page, mentioned that

"Often the open(2) call has unwanted side effects, that can be avoided
       under Linux by giving it the O_NONBLOCK flag."

I have seen open man page but can't find what are side effects of open.

Does anybody know what are side effects of open in general ?

Thanks,
Rahul
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