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pcap_list_datalinks, pcap_free_datalinks - get a list of link-layer header types supported by a capture device, and free that list

#include <pcap/pcap.h>

int pcap_list_datalinks(pcap_t *p, int **dlt_buf);
void pcap_free_datalinks(int *dlt_list);

pcap_list_datalinks () is used to get a list of the supported link-layer header types of the interface associated with the pcap descriptor. pcap_list_datalinks () allocates an array to hold the list and sets *dlt_buf to point to that array.

The caller is responsible for freeing the array with pcap_free_datalinks (), which frees the list of link-layer header types pointed to by dlt_list .

It must not be called on a pcap descriptor created by \%pcap_create (3PCAP) that has not yet been activated by \%pcap_activate (3PCAP).

pcap_list_datalinks () returns the number of link-layer header types in the array on success, PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been created but not activated, and PCAP_ERROR on other errors. If PCAP_ERROR is returned, pcap_geterr (3PCAP) or \%pcap_perror (3PCAP) may be called with p as an argument to fetch or display the error text. pcap (3PCAP), pcap_datalink_val_to_name (3PCAP), pcap-linktype (@MAN_MISC_INFO@)