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#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);
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) .