| JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1 | .\" @(#) $Header: /tcpdump/master/libpcap/pcap_create.3pcap,v 1.1 2008-04-06 02:53:21 guy Exp $ |
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| 22 | .TH PCAP_CREATE 3PCAP "5 April 2008" |
| 23 | .SH NAME |
| 24 | pcap_create \- create a live capture handle |
| 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 | pcap_t *pcap_create(const char *source, char *errbuf); |
| 38 | .ft |
| 39 | .fi |
| 40 | .SH DESCRIPTION |
| 41 | .B pcap_create() |
| 42 | is used to create a packet capture handle to look |
| 43 | at packets on the network. |
| 44 | .I source |
| 45 | is a string that specifies the network device to open; on Linux systems |
| 46 | with 2.2 or later kernels, a |
| 47 | .I source |
| 48 | argument of "any" or |
| 49 | .B NULL |
| 50 | can be used to capture packets from all interfaces. |
| 51 | .PP |
| 52 | The returned handle must be activated with |
| 53 | .B pcap_activate() |
| 54 | before packets can be captured |
| 55 | with it; options for the capture, such as promiscuous mode, can be set |
| 56 | on the handle before activating it. |
| 57 | .SH RETURN VALUE |
| 58 | .B pcap_create() |
| 59 | returns a |
| 60 | .I pcap_t * |
| 61 | on success and |
| 62 | .B NULL |
| 63 | on failure. |
| 64 | If |
| 65 | .B NULL |
| 66 | is returned, |
| 67 | .I errbuf |
| 68 | is filled in with an appropriate error message. |
| 69 | .I errbuf |
| 70 | is assumed to be able to hold at least |
| 71 | .B PCAP_ERRBUF_SIZE |
| 72 | chars. |
| 73 | .SH SEE ALSO |
| 74 | pcap(3PCAP), pcap_activate(3PCAP) |