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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON |
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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
capture packets on a device (typically a network interface, see
pcap_findalldevs(3PCAP) for a more detailed explanation). device
is a string that specifies the capture device to open, in this
function NULL means the same as the string "any".
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 128MiB (128*1024*1024).
promisc specifies whether the device 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.)
errbuf is a buffer large enough to hold at least PCAP_ERRBUF_SIZE
chars.
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.
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 2025-08-11.
(At that time, the date of the most recent commit that was found
in the repository was 2025-08-10.) 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
11 March 2025 PCAP_OPEN_LIVE(3PCAP)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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