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   pcap_datalink.3pcap    ( 3 )

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)