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PCAP_LOOKUPDEV(3)          Library Functions Manual          PCAP_LOOKUPDEV(3)

       pcap_lookupdev - find the default device on which to capture

       #include <pcap/pcap.h>

       char errbuf[PCAP_ERRBUF_SIZE];

       [DEPRECATED] char *pcap_lookupdev(char *errbuf);

       This interface is obsoleted by pcap_findalldevs(3).  To find a default
       device on which to capture, call pcap_findalldevs() and, if the list it
       returns is not empty, use the first device in the list.  (If the list
       is empty, there are no devices on which capture is possible.)

       pcap_lookupdev() returns a pointer to a string giving the name of a
       network device suitable for use with pcap_create() and pcap_activate(),
       or with pcap_open_live(), and with pcap_lookupnet().  If there is an
       error, NULL is returned and errbuf is filled in with an appropriate
       error message.  errbuf is assumed to be able to hold at least
       PCAP_ERRBUF_SIZE chars.

       pcap(3), pcap_create(3), pcap_activate(3), pcap_open_live(3),

       The pointer returned by pcap_lookupdev() points to a static buffer;
       subsequent calls to pcap_lookupdev() in the same thread, or calls to
       pcap_lookupdev() in another thread, may overwrite that buffer.

       In WinPcap, this function may return a UTF-16 string rather than an
       ASCII or UTF-8 string.

                               8 September 2017              PCAP_LOOKUPDEV(3)