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- .TH PCAP_LOOKUPNET 3PCAP "3 January 2014"
- .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)
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