pcap_lookupdev(3) - Linux man page
Name
pcap_lookupdev - find the default device on which to capture
Synopsis
#include <pcap/pcap.h>
char errbuf[PCAP_ERRBUF_SIZE];
char *pcap_lookupdev(char *errbuf);
Description
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(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP), pcap_open_live(3PCAP),
pcap_lookupnet(3PCAP)