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PCAP_LOOKUPDEV(3) Library Functions Manual PCAP_LOOKUPDEV(3) NAME pcap_lookupdev - find the default device on which to capture SYNOPSIS #include <pcap/pcap.h> char errbuf[PCAP_ERRBUF_SIZE]; [DEPRECATED] char *pcap_lookupdev(char *errbuf); DESCRIPTION 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. SEE ALSO pcap(3), pcap_create(3), pcap_activate(3), pcap_open_live(3), pcap_lookupnet(3) BUGS 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)