Manpages - pcap_fileno.3pcap

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*(3PCAP) and *pcap_activate*(3PCAP), or using *pcap_open_live*(3PCAP), *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*(3PCAP) or *pcap_fopen_offline*(3PCAP), a ``dead’’ *pcap_t opened using pcap_open_dead*(3PCAP), 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)