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PCAP_LIST_DATALINKS(3)     Library Functions Manual     PCAP_LIST_DATALINKS(3)

       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(3)
       that has not yet been activated by pcap_activate(3).

       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(3) or pcap_perror(3)
       may be called with p as an argument to fetch or display the error text.

       pcap(3), pcap_datalink_val_to_name(3), pcap-linktype(7)

                                 25 July 2018           PCAP_LIST_DATALINKS(3)