pcap_fileno(3pcap)

pcap_fileno3pcap

Get the file descriptor for a live capture

Usage

#include <pcap/pcap.h>

int pcap_fileno(pcap_t *p);

Overview

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.

Releases

9 releases since Debian 6.0 (Squeeze); the text changed 4 times.

  1. 6.0
  2. 7
  3. 8
  4. 9–10
  5. 11–Arch

From libpcap 1.11.0-1 in Arch Linux 2026-11-01. Parsed by carta from the page's man source.