PCAP_OPEN_DEAD(3PCAP) PCAP_OPEN_DEAD(3PCAP)
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 pre-
cision 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)
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