1PCAP_OPEN_DEAD(3PCAP) PCAP_OPEN_DEAD(3PCAP)
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6 pcap_open_dead, pcap_open_dead_with_tstamp_precision - open a fake
7 pcap_t for compiling filters or opening a capture for output
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10 #include <pcap/pcap.h>
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12 pcap_t *pcap_open_dead(int linktype, int snaplen);
13 pcap_t *pcap_open_dead_with_tstamp_precision(int linktype, int snaplen,
14 u_int precision);
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17 pcap_open_dead() and pcap_open_dead_with_tstamp_precision() are used
18 for creating a pcap_t structure to use when calling the other functions
19 in libpcap. It is typically used when just using libpcap for compiling
20 BPF code; it can also be used if using pcap_dump_open(3PCAP),
21 pcap_dump(3PCAP), and pcap_dump_close(3PCAP) to write a savefile if
22 there is no pcap_t that supplies the packets to be written.
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24 linktype specifies the link-layer type for the pcap_t.
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26 snaplen specifies the snapshot length for the pcap_t.
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28 When pcap_open_dead_with_tstamp_precision(), is used to create a pcap_t
29 for use with pcap_dump_open(), precision specifies the time stamp pre‐
30 cision for packets; PCAP_TSTAMP_PRECISION_MICRO should be specified if
31 the packets to be written have time stamps in seconds and microseconds,
32 and PCAP_TSTAMP_PRECISION_NANO should be specified if the packets to be
33 written have time stamps in seconds and nanoseconds. Its value does
34 not affect pcap_compile(3PCAP).
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37 pcap(3PCAP), pcap-linktype(7)
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41 3 January 2014 PCAP_OPEN_DEAD(3PCAP)