NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON 

PCAP_LOOKUPNET(3PCAP)                                  PCAP_LOOKUPNET(3PCAP)

NAME         top

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

SYNOPSIS         top

       #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         top

       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         top

       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         top

       pcap(3PCAP)

COLOPHON         top

       This page is part of the libpcap (packet capture library) project.
       Information about the project can be found at 
       ⟨http://www.tcpdump.org/⟩.  If you have a bug report for this manual
       page, see ⟨http://www.tcpdump.org/#patches⟩.  This page was obtained
       from the project's upstream Git repository 
       ⟨https://github.com/the-tcpdump-group/libpcap.git⟩ on 2017-07-05.  If
       you discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for the
       page, or you have corrections or improvements to the information in
       this COLOPHON (which is not part of the original manual page), send a
       mail to man-pages@man7.org
                               3 January 2014          PCAP_LOOKUPNET(3PCAP)