x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
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
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 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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