pcap_fileno - get the file descriptor for a live capture
#include <pcap/pcap.h> int pcap_fileno(pcap_t *p);
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(3PCAP), 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 PCAP_ERROR.
pcap(3PCAP)
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