I've heard about 'Zero Copy' a few weeks ago.
But I could not understand the meaning of that correctly.

Does it mean that it deliver packets from NIC driver to user-space without any copy ?
libpcap supports zero copy ?
If so,.. how does libpcap support that ?
While searching related documents, I found that some NIC driver support zero copy.
My problem is related to this fact ? 
I'm so confused. 

Please answer me.
Any help or advice would be greatly appreciated.

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