pcap_datalink(3) pcap_datalink(3)
NAME
pcap_datalink - get the link-layer header type
SYNOPSIS
#include <pcap/pcap.h>
pcap_datalink(3) *p);
DESCRIPTION
pcap_datalink(3) returns the link-layer header type for the live capture
or ``savefile'' specified by p.
It must not be called on a pcap descriptor created by pcap_create()
that has not yet been activated by pcap_activate().
https://www.tcpdump.org/linktypes.html lists the values pcap_datalink(3)
can return and describes the packet formats that correspond to those
values.
Do NOT assume that the packets for a given capture or ``savefile`` will
have any given link-layer header type, such as DLT_EN10MB for Ethernet.
For example, the "any" device on Linux will have a link-layer header
type of 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
DLT_EN10MB for Ethernet.
RETURN VALUE
pcap_datalink(3) returns the link-layer header type on success and
PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been
created but not activated.
SEE ALSO
pcap(3), pcap-linktype(7)
7 April 2014 pcap_datalink(3)
libpcap 1.9.0 - Generated Sat Jul 28 16:13:23 CDT 2018