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Is it possible to use zero-copy packets mechanism for reading packets using libpcap on Linux?
(I’m using CentOS 6.2)
If yes, can I see any example of code?
Yes, libpcap 1.0 and later do it, although later versions of libpcap have fixed a number of bugs, so the later the version of libpcap being used, the better it works. Code written to the standard libpcap APIs will use zero-copy capturing on Linux with libpcap 1.0 and later.
(Netsniff-ng has its own code to capture packets, rather than using libpcap.)