pcap_list_datalinks(3) - NetBSD Manual Pages

Command:
Section:
Arch:
Collection:
>>>
PCAP_LIST_DATALINKS(3)                                  PCAP_LIST_DATALINKS(3)




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


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 (-1)  on
       other  errors.   If  PCAP_ERROR is returned, pcap_geterr() or pcap_per-
       ror() may be called with p as an argument to fetch or display the error
       text.


SEE ALSO

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



                                 8 March 2015           PCAP_LIST_DATALINKS(3)