pcap_list_tstamp_types, pcap_free_tstamp_types - get a list of time stamp types
  supported by a capture device, and free that list
#include <pcap/pcap.h>
int pcap_list_tstamp_types(pcap_t *p, int **tstamp_typesp);
void pcap_free_tstamp_types(int *tstamp_types);
pcap_list_tstamp_types() is used to get a list of the supported time
  stamp types of the interface associated with the pcap descriptor.
  pcap_list_tstamp_types() allocates an array to hold the list and sets
  *tstamp_typesp to point to the array. See pcap-tstamp(7) for a
  list of all the time stamp types.
The caller is responsible for freeing the array with
    pcap_free_tstamp_types(), which frees the list pointed to by
    tstamp_types.
pcap_list_tstamp_types() returns the number of time stamp types in the
  array on success and PCAP_ERROR on failure. A return value of zero
  means that you cannot specify a time stamp type; you are limited to the
  capture device's default time stamp type. If PCAP_ERROR is returned,
  pcap_geterr() or pcap_perror() may be called with p as an
  argument to fetch or display the error text.
pcap(3), pcap_geterr(3), pcap_tstamp_type_val_to_name(3), pcap-tstamp(7)