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(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 pcap_compile(3PCAP).

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(3PCAP), pcap-linktype(7)

                                          3 January 2014                    PCAP_OPEN_DEAD(3PCAP)