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pcap_lookupdev - find the default device on which to capture
[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(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)