PCAP_OPEN_LIVE(3PCAP) PCAP_OPEN_LIVE(3PCAP)
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 in-
terfaces.
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 mes-
sage. 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 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_create(3PCAP), pcap_activate(3PCAP)
6 December 2017 PCAP_OPEN_LIVE(3PCAP)
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