EN JA
PCAP_LOOKUPNET(3)
PCAP_LOOKUPNET(3) FreeBSD Library Functions Manual PCAP_LOOKUPNET(3)

NAME

pcap_lookupnet - find the IPv4 network number and netmask for a device

SYNOPSIS


#include <pcap/pcap.h>


char errbuf[PCAP_ERRBUF_SIZE];


int pcap_lookupnet(const char *device, bpf_u_int32 *netp,
bpf_u_int32 *maskp, char *errbuf);

DESCRIPTION

pcap_lookupnet() is used to determine the IPv4 network number and mask associated with the network device device. Both netp and maskp are bpf_u_int32 pointers.

RETURN VALUE

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.

SEE ALSO

pcap(3)
5 April 2008