pcap_open_live(3pcap) — Linux manual page


PCAP_OPEN_LIVE(3PCAP)                              PCAP_OPEN_LIVE(3PCAP)

NAME         top

       pcap_open_live - open a device for capturing

SYNOPSIS         top

       #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         top

       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         top

       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.

SEE ALSO         top

       pcap_create(3PCAP), pcap_activate(3PCAP)

COLOPHON         top

       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 2022-12-17.
       (At that time, the date of the most recent commit that was found
       in the repository was 2022-12-13.)  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

                             6 December 2017       PCAP_OPEN_LIVE(3PCAP)