PCAP_LOOKUPNET(3PCAP)                                  PCAP_LOOKUPNET(3PCAP)

NAME         top

       pcap_lookupnet  -  find  the  IPv4  network  number and netmask for a

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


COLOPHON         top

       This page is part of the libpcap (packet capture library) project.
       Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, see ⟨⟩.  This page was obtained
       from the project's upstream Git repository
       ⟨⟩ on 2018-02-02.
       (At that time, the date of the most recent commit that was found in
       the repository was 2018-01-31.)  If you discover any rendering prob‐
       lems in this HTML version of the page, or you believe there is a bet‐
       ter 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

                               3 January 2014          PCAP_LOOKUPNET(3PCAP)