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pcap_dump_open, pcap_dump_fopen - open a file to which to write packets

#include <pcap/pcap.h>

pcap_dumper_t *pcap_dump_open(pcap_t *p, const char *fname);
pcap_dumper_t *pcap_dump_open_append(pcap_t *p, const char *fname);
pcap_dumper_t *pcap_dump_fopen(pcap_t *p, FILE *fp);

 DESCRIPTION
 pcap_dump_open() is called to open a ``savefile'' for writing.
 fname specifies the name of the file to open. The file will have
the same format as those used by
 tcpdump (1) and
 tcpslice (1). The name "-" is a synonym
for
 stdout . 

 pcap_dump_fopen() is called to write data to an existing open stream
 fp ; this stream will be closed by a subsequent call to
 pcap_dump_close() . Note that on Windows, that stream should be opened in binary mode.

 p is a capture or ``savefile'' handle returned by an earlier call to
 pcap_create() and activated by an earlier call to
 pcap_activate() , or returned by an earlier call to
 pcap_open_offline() ,  pcap_open_live() , or
 pcap_open_dead() . The time stamp precision, link-layer type, and snapshot length from
 p are used as the link-layer type and snapshot length of the output file.

 pcap_dump_open_append() is like
 pcap_dump_open but does not create the file if it does not exist and, if it does
already exist, and is a pcap file with the same byte order as the host
opening the file, and has the same time stamp precision, link-layer
header type, and snapshot length as
 p , it will write new packets at the end of the file.
 RETURN VALUES
A pointer to a
 pcap_dumper_t structure to use in subsequent
 pcap_dump() and
 pcap_dump_close() calls is returned on success.
 NULL is returned on failure.
If
 NULL is returned,
 pcap_geterr(p) can be used to get the error text.
 SEE ALSO
pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP),
\%pcap_open_offline(3PCAP), pcap_open_live(3PCAP), pcap_open_dead(3PCAP),
pcap_dump(3PCAP), pcap_dump_close(3PCAP), pcap_geterr(3PCAP),
\%pcap-savefile(5)