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 packet buffer timeout, as a non-negative value, in milliseconds.  (See
       pcap(3PCAP) for an explanation of the packet buffer timeout.)

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 message.  errbuf may also be set to  warning
       text  when  pcap_open_live() succeeds; 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.

SEE ALSO

       pcap_create(3PCAP), pcap_activate(3PCAP)

                                         6 December 2017                    PCAP_OPEN_LIVE(3PCAP)