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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_DATALINK 3PCAP "7 April 2014"
-.SH NAME
-pcap_datalink \- get the link-layer header type
-.SH SYNOPSIS
-.nf
-.ft B
-#include <pcap/pcap.h>
-.ft
-.LP
-.ft B
-int pcap_datalink(pcap_t *p);
-.ft
-.fi
-.SH DESCRIPTION
-.B pcap_datalink()
-returns the link-layer header type for the live capture or ``savefile''
-specified by
-.IR p .
-.PP
-It must not be called on a pcap descriptor created by
-.B \%pcap_create(3PCAP)
-that has not yet been activated by
-.BR \%pcap_activate(3PCAP) .
-.PP
-.I https://www.tcpdump.org/linktypes.html
-lists the values
-.B pcap_datalink()
-can return and describes the packet formats that
-correspond to those values.
-.PP
-Do
-.B NOT
-assume that the packets for a given capture or ``savefile`` will have
-any given link-layer header type, such as
-.B DLT_EN10MB
-for Ethernet. For example, the "any" device on Linux will have a
-link-layer header type of
-.B DLT_LINUX_SLL
-even if all devices on the system at the time the "any" device is opened
-have some other data link type, such as
-.B DLT_EN10MB
-for Ethernet.
-.SH RETURN VALUE
-.B pcap_datalink()
-returns the link-layer header type on success and
-.B PCAP_ERROR_NOT_ACTIVATED
-if called on a capture handle that has been created but not activated.
-.SH SEE ALSO
-pcap(3PCAP), pcap-linktype(7)