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pcap_dump_open(3)                                    pcap_dump_open(3)




NAME

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


SYNOPSIS

       #include <pcap/pcap.h>

       pcap_dump_open(3) *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(3) 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(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)



                                 22 June 2018            pcap_dump_open(3)

libpcap 1.9.0 - Generated Sat Jul 28 16:14:01 CDT 2018
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