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| .TH PCAP_LOOKUPNET 3PCAP "5 April 2008" |
| .SH NAME |
| pcap_lookupnet \- find the IPv4 network number and netmask for a device |
| .SH SYNOPSIS |
| .nf |
| .ft B |
| #include <pcap/pcap.h> |
| .ft |
| .LP |
| .nf |
| .ft B |
| char errbuf[PCAP_ERRBUF_SIZE]; |
| .ft |
| .LP |
| .ft B |
| int pcap_lookupnet(const char *device, bpf_u_int32 *netp, |
| .ti +8 |
| bpf_u_int32 *maskp, char *errbuf); |
| .ft |
| .fi |
| .SH DESCRIPTION |
| .B pcap_lookupnet() |
| is used to determine the IPv4 network number and mask |
| associated with the network device |
| .IR device . |
| Both |
| .I netp |
| and |
| .I maskp |
| are |
| .I bpf_u_int32 |
| pointers. |
| .SH RETURN VALUE |
| .B pcap_lookupnet() |
| returns 0 on success and \-1 on failure. |
| If \-1 is returned, |
| .I errbuf |
| is filled in with an appropriate error message. |
| .I errbuf |
| is assumed to be able to hold at least |
| .B PCAP_ERRBUF_SIZE |
| chars. |
| .SH SEE ALSO |
| pcap(3PCAP) |