NAME

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

SYNOPSIS

       #include <pcap/pcap.h>

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

DESCRIPTION

       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).

RETURN VALUE

       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.

SEE ALSO

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

                                                  25 July 2018                        PCAP_LIST_DATALINKS(3PCAP)