pcap_open_live man page on FreeBSD

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PCAP_OPEN_LIVE(3)					     PCAP_OPEN_LIVE(3)

NAME
       pcap_open_live - open a device for capturing

SYNOPSIS
       #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);

DESCRIPTION
       pcap_open_live()	 is  used to obtain a packet capture handle to look at
       packets on the network.	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.

RETURN VALUE
       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  mes‐
       sage.   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 warn‐
       ing 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.

SEE ALSO
       pcap(3), pcap_create(3), pcap_activate(3)

				 5 April 2008		     PCAP_OPEN_LIVE(3)
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