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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON |
PCAP_OPEN_LIVE(3PCAP) PCAP_OPEN_LIVE(3PCAP)
pcap_open_live - open a device for capturing
#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);
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 in milliseconds. (See
pcap(3PCAP) for an explanation of the packet buffer timeout.)
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.
pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP)
This page is part of the libpcap (packet capture library) project.
Information about the project can be found at
⟨http://www.tcpdump.org/⟩. If you have a bug report for this manual
page, see ⟨http://www.tcpdump.org/#patches⟩. This page was obtained
from the project's upstream Git repository
⟨https://github.com/the-tcpdump-group/libpcap.git⟩ on 2017-07-05. If
you discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for the
page, or you have corrections or improvements to the information in
this COLOPHON (which is not part of the original manual page), send a
mail to man-pages@man7.org
20 January 2017 PCAP_OPEN_LIVE(3PCAP)