Question about ioctls.h

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Quoting <asm/ioctls.h>:

> #if defined(__USE_MISC) || defined (__KERNEL__)
> #define tIOC            ('t' << 8)
> #endif

Could somebody try to explain this to me?  I'm especially interested
in the #if part.  Why isn't tIOC defined normally?  It is used later.
in the file - and it is used externally by rp-pppoe for example.

Regards,

	Joey

-- 
All language designers are arrogant.  Goes with the territory...
	-- Larry Wall


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