Updated: 2022/Sep/29

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PCAP_OPEN_DEAD(3)          Library Functions Manual          PCAP_OPEN_DEAD(3)



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

SYNOPSIS
       #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
       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(3), pcap_dump(3),
       and pcap_dump_close(3) 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 pcap_compile(3).

BACKWARD COMPATIBILITY
       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
       pcap(3), pcap-linktype(7)



                                3 January 2014               PCAP_OPEN_DEAD(3)