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.TH PCAP_FILENO 3PCAP "25 July 2018"
.SH NAME
pcap_fileno \- get the file descriptor for a live capture
.SH SYNOPSIS
.nf
.ft B
#include <pcap/pcap.h>
.ft
.LP
.ft B
int pcap_fileno(pcap_t *p);
.ft
.fi
.SH DESCRIPTION
If
.I p
refers to a network device that was opened for a live capture using
a combination of
.B pcap_create(3PCAP)
and
.BR pcap_activate(3PCAP) ,
or using
.BR pcap_open_live(3PCAP) ,
.B pcap_fileno()
returns the file descriptor from which captured packets are read.
.LP
If
.I p
refers to a ``savefile'' that was opened using functions such as
.BR pcap_open_offline(3PCAP)
or
.BR pcap_fopen_offline(3PCAP) ,
a ``dead''
.B pcap_t
opened using
.BR pcap_open_dead(3PCAP) ,
or a
.B pcap_t
that was created with
.B pcap_create()
but that has not yet been activated with
.BR pcap_activate() ,
it returns
.BR PCAP_ERROR .
.SH SEE ALSO
pcap(3PCAP)