pcap_datalink - layer header type
#include <pcap/pcap.h> int pcap_datalink(pcap_t *p);
PCAP_DATALINK(3pcap) PCAP_DATALINK(3pcap)
NAME
pcap_datalink - get the link-layer header type
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(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 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.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+------------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+------------------------+
|Availability | system/library/libpcap |
+---------------+------------------------+
|Stability | Uncommitted |
+---------------+------------------------+
SEE ALSO
pcap(3PCAP), pcap-linktype(7)
NOTES
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from https://www.tcpdump.org/release/libp-
cap-1.9.1.tar.gz.
Further information about this software can be found on the open source
community website at https://www.tcpdump.org/.
7 April 2014 PCAP_DATALINK(3pcap)