PCAP_LOOKUPNET(3PCAP) PCAP_LOOKUPNET(3PCAP)
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 PCAP_ERROR on failure. If
PCAP_ERROR is returned, errbuf is filled in with an appropriate error
message. errbuf is assumed to be able to hold at least PCAP_ER-
RBUF_SIZE chars.
SEE ALSO
pcap(3PCAP)
25 July 2018 PCAP_LOOKUPNET(3PCAP)
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