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pcap_fileno(3pcap) [mojave man page]

PCAP_FILENO(3PCAP)														PCAP_FILENO(3PCAP)

NAME
pcap_fileno - get the file descriptor for a live capture SYNOPSIS
#include <pcap/pcap.h> int pcap_fileno(pcap_t *p); DESCRIPTION
If p refers to a network device that was opened for a live capture using a combination of pcap_create() and pcap_activate(), or using pcap_open_live(), pcap_fileno() returns the file descriptor from which captured packets are read. If p refers to a ``savefile'' that was opened using functions such as pcap_open_offline() or pcap_fopen_offline(), a ``dead'' pcap_t opened using pcap_open_dead(), or a pcap_t that was created with pcap_create() but that has not yet been activated with pcap_activate(), it returns -1. SEE ALSO
pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP), pcap_open_live(3PCAP), pcap_open_offline(3PCAP), pcap_fopen_offline(3PCAP), pcap_open_dead(3PCAP) 7 April 2014 PCAP_FILENO(3PCAP)

Check Out this Related Man Page

PCAP_FILENO(3)						     Library Functions Manual						    PCAP_FILENO(3)

NAME
pcap_fileno - get the file descriptor for a live capture SYNOPSIS
#include <pcap/pcap.h> int pcap_fileno(pcap_t *p); DESCRIPTION
If p refers to a network device that was opened for a live capture using a combination of pcap_create() and pcap_activate(), or using pcap_open_live(), pcap_fileno() returns the file descriptor from which captured packets are read. If p refers to a ``savefile'' that was opened using functions such as pcap_open_offline() or pcap_fopen_offline(), a ``dead'' pcap_t opened using pcap_open_dead(), or a pcap_t that was created with pcap_create() but that has not yet been activated with pcap_activate(), it returns -1. SEE ALSO
pcap(3), pcap_create(3), pcap_activate(3), pcap_open_live(3), pcap_open_offline(3), pcap_fopen_offline(3), pcap_open_dead(3) 3 November 2009 PCAP_FILENO(3)
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