pcap_datalink_val_to_name(3) pcap_datalink_val_to_name(3)
NAME
pcap_datalink_val_to_name, pcap_datalink_val_to_description,
pcap_datalink_val_to_description_or_dlt - get a name or description for
a link-layer header type value
SYNOPSIS
#include <pcap.h>
pcap_datalink_val_to_name(3) dlt);
const char *pcap_datalink_val_to_description(int dlt);
const char *pcap_datalink_val_to_description_or_dlt(int dlt);
DESCRIPTION
pcap_datalink_val_to_name() translates a link-layer header type value
to the corresponding link-layer header type name, which is the DLT_
name for the link-layer header type value with the DLT_ removed. A
null pointer is returned if the type value does not correspond to a
known DLT_ value.
pcap_datalink_val_to_description() translates a link-layer header type
value to a short description of that link-layer header type. A null
pointer is returned if the type value does not correspond to a known
DLT_ value.
pcap_datalink_val_to_description_or_dlt() translates a link-layer
header type value to a short description of that link-layer header type
just like pcap_datalink_val_to_description(). If the type value does
not correspond to a known DLT_ value, the string "DLT n" is returned,
where n is the value of the dlt argument.
BACKWARD COMPATIBILITY
The pcap_datalink_val_to_description_or_dlt() function first became
available in libpcap release 1.9.1. In previous releases,
pcap_datalink_val_to_description() would have to be called and, if it
returned a null pointer, a default string would have to be constructed.
SEE ALSO
pcap(3), pcap_datalink(3), pcap_list_datalinks(3),
pcap_datalink_name_to_val(3)
6 September 2026
pcap_datalink_val_to_name(3)
libpcap 1.11.0 - Generated Sun Sep 13 16:56:22 CDT 2026