SYNOPSIS

#include <pcap/pcap.h>

int pcap_datalink(pcap_t *p);

DESCRIPTION

pcap_datalink() 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().

http://www.tcpdump.org/linktypes.html lists the values pcap_datalink() 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() 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.