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PCAP_OPEN_DEAD

Section: Misc. Reference Manual Pages (3PCAP)
Updated: 3 January 2014
Index Return to Main Contents
 

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(), pcap_dump(), and pcap_dump_close() 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().  

SEE ALSO

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
SEE ALSO


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