osx man page for pcap_fileno

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)

								   5 April 2008 						PCAP_FILENO(3PCAP)