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NetBSD 6.1.5 - man page for pcap_open_live (netbsd section 3)

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       pcap_open_live - open a device for capturing

       #include <pcap/pcap.h>

       char errbuf[PCAP_ERRBUF_SIZE];

       pcap_t *pcap_open_live(const char *device, int snaplen,
	       int promisc, int to_ms, char *errbuf);

       pcap_open_live()  is used to obtain a packet capture handle to look at packets on the net-
       work.  device is a string that specifies the network device to open; on Linux systems with
       2.2  or	later  kernels, a device argument of "any" or NULL can be used to capture packets
       from all interfaces.

       snaplen specifies the snapshot length to be set on the handle.

       promisc specifies if the interface is to be put into promiscuous mode.

       to_ms specifies the read timeout in milliseconds.

       pcap_open_live() returns a pcap_t * on success and NULL on failure.  If NULL is	returned,
       errbuf  is filled in with an appropriate error message.	errbuf may also be set to warning
       text when pcap_open_live() succeds; to detect this case the caller should  store  a  zero-
       length  string  in  errbuf  before calling pcap_open_live() and display the warning to the
       user if errbuf is no longer a zero-length string.  errbuf is assumed to be able to hold at
       least PCAP_ERRBUF_SIZE chars.

       pcap(3), pcap_create(3), pcap_activate(3)

					   5 April 2008 			PCAP_OPEN_LIVE(3)
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