pcap_list_tstamp_types(3PCAP) man page
#include <pcap/pcap.h> int pcap_list_tstamp_types(pcap_t *p, int **tstamp_typesp); void pcap_free_tstamp_types(int *tstamp_types);
The caller is responsible for freeing the array with pcap_free_tstamp_types(), which frees the list pointed to by tstamp_types.
PCAP_ERRORon failure. A return value of one means that the only time stamp type supported is the one in the list, which is the capture device's default time stamp type. A return value of zero means that the only time stamp type supported is
PCAP_TSTAMP_HOST, which is the capture device's default time stamp type (only older versions of libpcap will return that; newer versions will always return one or more types). If
PCAP_ERRORis returned, pcap_geterr(3PCAP) or pcap_perror(3PCAP) may be called with p as an argument to fetch or display the error text.
These functions became available in libpcap release 1.2.1. In previous releases, the time stamp type cannot be set; only the default time stamp type offered by a capture source is available.