| JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1 | .\" @(#) $Header: /tcpdump/master/libpcap/pcap_lookupnet.3pcap,v 1.3 2008-04-06 02:53:22 guy Exp $ |
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| 22 | .TH PCAP_LOOKUPNET 3PCAP "5 April 2008" |
| 23 | .SH NAME |
| 24 | pcap_lookupnet \- find the IPv4 network number and netmask for a device |
| 25 | .SH SYNOPSIS |
| 26 | .nf |
| 27 | .ft B |
| 28 | #include <pcap/pcap.h> |
| 29 | .ft |
| 30 | .LP |
| 31 | .nf |
| 32 | .ft B |
| 33 | char errbuf[PCAP_ERRBUF_SIZE]; |
| 34 | .ft |
| 35 | .LP |
| 36 | .ft B |
| 37 | int pcap_lookupnet(const char *device, bpf_u_int32 *netp, |
| 38 | .ti +8 |
| 39 | bpf_u_int32 *maskp, char *errbuf); |
| 40 | .ft |
| 41 | .fi |
| 42 | .SH DESCRIPTION |
| 43 | .B pcap_lookupnet() |
| 44 | is used to determine the IPv4 network number and mask |
| 45 | associated with the network device |
| 46 | .IR device . |
| 47 | Both |
| 48 | .I netp |
| 49 | and |
| 50 | .I maskp |
| 51 | are |
| 52 | .I bpf_u_int32 |
| 53 | pointers. |
| 54 | .SH RETURN VALUE |
| 55 | .B pcap_lookupnet() |
| 56 | returns 0 on success and \-1 on failure. |
| 57 | If \-1 is returned, |
| 58 | .I errbuf |
| 59 | is filled in with an appropriate error message. |
| 60 | .I errbuf |
| 61 | is assumed to be able to hold at least |
| 62 | .B PCAP_ERRBUF_SIZE |
| 63 | chars. |
| 64 | .SH SEE ALSO |
| 65 | pcap(3PCAP) |