получить тип заголовка канального уровня (get the link-layer header type)
Имя (Name)
pcap_datalink - get the link-layer header type
Синопсис (Synopsis)
#include <pcap/pcap.h>
int pcap_datalink(pcap_t *p);
Описание (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(3PCAP) that has not yet been activated by
pcap_activate(3PCAP).
https://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 or
DLT_LINUX_SLL2 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.
Возвращаемое значение (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.
Смотри также (See also)
pcap(3PCAP), pcap-linktype(7)
