pcap_datalink_val_to_name(3PCAP) man page

pcap_datalink_val_to_name(3PCAP) man page - 图1

pcap_datalink_val_to_name(3PCAP) man page

Updated: 6 September 2026 • View in plain text • Return to Main Contents

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>

const char *pcap_datalink_val_to_name(int 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(3PCAP), pcap_datalink(3PCAP), pcap_list_datalinks(3PCAP), pcap_datalink_name_to_val(3PCAP)

COLOPHON

This HTML man page was generated at 15:15:20 GMT, September 13, 2026 from a source man page in “The Tcpdump Group” git repositories using man2html and other tools.