pcap_open_dead(3pcap) — Linux manual page


PCAP_OPEN_DEAD(3PCAP)                              PCAP_OPEN_DEAD(3PCAP)

NAME         top

       pcap_open_dead, pcap_open_dead_with_tstamp_precision - open a
       fake pcap_t for compiling filters or opening a capture for output

SYNOPSIS         top

       #include <pcap/pcap.h>

       pcap_t *pcap_open_dead(int linktype, int snaplen);
       pcap_t *pcap_open_dead_with_tstamp_precision(int linktype, int snaplen,
           u_int precision);

DESCRIPTION         top

       pcap_open_dead() and pcap_open_dead_with_tstamp_precision() are
       used for creating a pcap_t structure to use when calling the
       other functions in libpcap.  It is typically used when just using
       libpcap for compiling BPF code; it can also be used if using
       pcap_dump_open(3PCAP), pcap_dump(3PCAP), and
       pcap_dump_close(3PCAP) to write a savefile if there is no pcap_t
       that supplies the packets to be written.

       linktype specifies the link-layer type for the pcap_t.

       snaplen specifies the snapshot length for the pcap_t.

       When pcap_open_dead_with_tstamp_precision(), is used to create a
       pcap_t for use with pcap_dump_open(), precision specifies the
       time stamp precision for packets; PCAP_TSTAMP_PRECISION_MICRO
       should be specified if the packets to be written have time stamps
       in seconds and microseconds, and PCAP_TSTAMP_PRECISION_NANO
       should be specified if the packets to be written have time stamps
       in seconds and nanoseconds.  Its value does not affect


       The pcap_open_dead_with_tstamp_precision() function became
       available in libpcap release 1.5.1.  In previous releases, there
       was no mechanism to open a savefile for writing with time stamps
       given in seconds and nanoseconds.

SEE ALSO         top

       pcap(3PCAP), pcap-linktype(7)

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 2023-06-23.
       (At that time, the date of the most recent commit that was found
       in the repository was 2023-06-21.)  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

                             3 January 2014        PCAP_OPEN_DEAD(3PCAP)