pcap: forcing pcap_loop() failures

[Alex Dupuy <alex.dupuy () mac com>]

Recent versions of libpcap have a pcap_breakloop() function that does what you 
are specifically asking for (called inside a packet loop handler, it causes an 
immediate return from the loop with a -2 error code), although I suspect that 
using the "any" interface, or pcap_next_ex(), might be better solutions to your 
overall problem.

@alex
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