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  whether  the  interface  is to be put into promiscuous mode.  If promisc is non-zero,
       promiscuous mode will be set, otherwise it will not be set.

       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)