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)