1PCAP_DUMP_OPEN(3PCAP) PCAP_DUMP_OPEN(3PCAP)
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6 pcap_dump_open, pcap_dump_fopen - open a file to which to write packets
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9 #include <pcap/pcap.h>
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11 pcap_dumper_t *pcap_dump_open(pcap_t *p, const char *fname);
12 pcap_dumper_t *pcap_dump_open_append(pcap_t *p, const char *fname);
13 pcap_dumper_t *pcap_dump_fopen(pcap_t *p, FILE *fp);
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16 pcap_dump_open() is called to open a ``savefile'' for writing. fname
17 specifies the name of the file to open. The file will have the same
18 format as those used by tcpdump(1) and tcpslice(1). The name "-" is a
19 synonym for stdout.
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21 pcap_dump_fopen() is called to write data to an existing open stream
22 fp; this stream will be closed by a subsequent call to
23 pcap_dump_close(3PCAP). Note that on Windows, that stream should be
24 opened in binary mode.
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26 p is a capture or ``savefile'' handle returned by an earlier call to
27 pcap_create(3PCAP) and activated by an earlier call to
28 pcap_activate(3PCAP), or returned by an earlier call to
29 pcap_open_offline(3PCAP), pcap_open_live(3PCAP), or
30 pcap_open_dead(3PCAP). The time stamp precision, link-layer type, and
31 snapshot length from p are used as the link-layer type and snapshot
32 length of the output file.
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34 pcap_dump_open_append() is like pcap_dump_open() but does not create
35 the file if it does not exist and, if it does already exist, and is a
36 pcap file with the same byte order as the host opening the file, and
37 has the same time stamp precision, link-layer header type, and snapshot
38 length as p, it will write new packets at the end of the file.
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41 A pointer to a pcap_dumper_t structure to use in subsequent
42 pcap_dump(3PCAP) and pcap_dump_close(3PCAP) calls is returned on suc‐
43 cess. NULL is returned on failure. If NULL is returned,
44 pcap_geterr(3PCAP) can be used to get the error text.
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47 The pcap_dump_open_append() function became available in libpcap
48 release 1.7.2. In previous releases, there is no support for appending
49 packets to an existing savefile.
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52 pcap(3PCAP), pcap-savefile(5)
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56 22 August 2018 PCAP_DUMP_OPEN(3PCAP)