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by Kimmo Suominen.
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pcap_snapshot - get the snapshot length
int pcap_snapshot(pcap_t *p);
pcap_snapshot() returns the snapshot length specified when
pcap_set_snapshot() or pcap_open_live() was called, for a live capture,
or the snapshot length from the capture file, for a ``savefile''.
It must not be called on a pcap descriptor created by pcap_create()
that has not yet been activated by pcap_activate().
pcap_snapshot() returns the snapshot length on success and
PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been
created but not activated.
7 April 2014 PCAP_SNAPSHOT(3)