pcap_open_live(3) pcap_open_live(3)
NAME
pcap_open_live - open a device for capturing
SYNOPSIS
#include <pcap/pcap.h>
char errbuf[PCAP_ERRBUF_SIZE];
pcap_open_live(3) 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 all supported Linux systems, as well as on recent
versions of macOS and Solaris, a device argument of "any" or NULL can
be used to capture packets from all network interfaces. The latter
should not be confused with all available capture devices as seen by
pcap_findalldevs(3), which may also include D-Bus, USB etc.
snaplen specifies the snapshot length to be set on the handle. If the
packet data should not be truncated at the end, a value of 262144
should be sufficient for most devices, but D-Bus devices require a
value of 128MB (128*1024*1024).
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(3) for an explanation of the packet buffer
timeout.)
errbuf is a buffer large enough to hold at least PCAP_ERRBUF_SIZE
chars.
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.
SEE ALSO
pcap_create(3), pcap_activate(3)
4 March 2024 pcap_open_live(3)
libpcap 1.10.5 - Generated Sat Aug 31 09:43:16 CDT 2024