PCAP_DUMP_OPEN(3PCAP)                                  PCAP_DUMP_OPEN(3PCAP)

NAME         top

       pcap_dump_open, pcap_dump_fopen - open a file to which to write pack‐

SYNOPSIS         top

       #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         top

       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.  Note that on Windows, that stream should be opened in binary

       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

RETURN VALUES         top

       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         top

       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)

COLOPHON         top

       This page is part of the libpcap (packet capture library) project.
       Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, see ⟨⟩.  This page was obtained
       from the project's upstream Git repository
       ⟨⟩ on 2018-04-30.
       (At that time, the date of the most recent commit that was found in
       the repository was 2018-04-30.)  If you discover any rendering prob‐
       lems in this HTML version of the page, or you believe there is a bet‐
       ter or more up-to-date source for the page, or you have corrections
       or improvements to the information in this COLOPHON (which is not
       part of the original manual page), send a mail to

                              16 February 2015         PCAP_DUMP_OPEN(3PCAP)