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)