NAME

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

SYNOPSIS

       #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.  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)

                                                  5 April 2008                             PCAP_DUMP_OPEN(3PCAP)