PCAP_LOOKUPNET(3) Library Functions Manual PCAP_LOOKUPNET(3)
pcap_lookupnet - find the IPv4 network number and netmask for a device
int pcap_lookupnet(const char *device, bpf_u_int32 *netp,
bpf_u_int32 *maskp, char *errbuf);
pcap_lookupnet() is used to determine the IPv4 network number and mask
associated with the network device device. Both netp and maskp are
pcap_lookupnet() returns 0 on success and -1 on failure. If -1 is
returned, errbuf is filled in with an appropriate error message.
errbuf is assumed to be able to hold at least PCAP_ERRBUF_SIZE chars.
5 April 2008 PCAP_LOOKUPNET(3)