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+.\" Copyright (c) 1994, 1996, 1997
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that: (1) source code distributions
+.\" retain the above copyright notice and this paragraph in its entirety, (2)
+.\" distributions including binary code include the above copyright notice and
+.\" this paragraph in its entirety in the documentation or other materials
+.\" provided with the distribution, and (3) all advertising materials mentioning
+.\" features or use of this software display the following acknowledgement:
+.\" ``This product includes software developed by the University of California,
+.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+.\" the University nor the names of its contributors may be used to endorse
+.\" or promote products derived from this software without specific prior
+.\" written permission.
+.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+.\"
+.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)