Question about the role of macros _IO

[Sébastien BOMBAL]

Hi everybody,

I have a question about the purpose of macros _IO, _IOR, _IOW, _IORW. I saw in 
the 2.6 code that they are used sometimes for IOCTL to group them. Is it 
the only purpose ?

Thanks for your help.

Regards.

-- 
Sébastien BOMBAL


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