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)