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)