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FreeBSD 11.0 - man page for pcap_is_swapped (freebsd section 3)

PCAP_IS_SWAPPED(3)					     Library Functions Manual						PCAP_IS_SWAPPED(3)

NAME
pcap_is_swapped - find out whether a savefile has the native byte order
SYNOPSIS
#include <pcap/pcap.h> int pcap_is_swapped(pcap_t *p);
DESCRIPTION
pcap_is_swapped() returns true (1) if p refers to a ``savefile'' that uses a different byte order than the current system. For a live cap- ture, it always returns false (0). It must not be called on a pcap descriptor created by pcap_create() that has not yet been activated by pcap_activate().
RETURN VALUE
pcap_datalink() returns true (1) or false (0) on success and PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been created but not activated.
SEE ALSO
pcap(3) 17 September 2013 PCAP_IS_SWAPPED(3)

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