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PCAP_DUMP_OPEN(3)          Library Functions Manual          PCAP_DUMP_OPEN(3)

       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);

       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(8) and tcpslice(1).  The name "-" is a
       synonym for stdout.

       pcap_dump_fopen() is called to write data to an existing open stream
       fp.  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.

       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.

       pcap(3), pcap_create(3), pcap_activate(3), pcap_open_offline(3),
       pcap_open_live(3), pcap_open_dead(3), pcap_dump(3), pcap_dump_close(3),
       pcap_geterr(3), pcap-savefile(5)

                               16 February 2015              PCAP_DUMP_OPEN(3)