pcap_lookupnet man page on FreeBSD

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PCAP_LOOKUPNET(3)					     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		     PCAP_LOOKUPNET(3)
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