[PATCH FOR REVIEW] interface description (revised)

[Xin LI]

Hi,

Here is the revised implementation for the interface description
feature, based on feedback from src-all at .

Some limitations:
 * Not yet able to send announce through route socket.  I need to
figure out a proper way to do this, maybe a future feature;
 * 32-bit vs 64-bit API compatibility.  Since the kernel has to copy
in a string, is there a clean way to do this?  I think we will also
need to deal with similar issue with SIOCSIFNAME as well.

Cheers,
-- 
Xin LI <delphij at delphij.net> http://www.delphij.net
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