pcap_open_dead(3) [freebsd man page]

PCAP_OPEN_DEAD(3)					     Library Functions Manual						 PCAP_OPEN_DEAD(3)

NAME

       pcap_open_dead, pcap_open_dead_with_tstamp_precision - open a fake pcap_t for compiling filters or opening a capture for output

SYNOPSIS

       #include <pcap/pcap.h>

       pcap_t *pcap_open_dead(int linktype, int snaplen);
       pcap_t *pcap_open_dead_with_tstamp_precision(int linktype, int snaplen,
	   u_int precision);

DESCRIPTION

       pcap_open_dead()  and  pcap_open_dead_with_tstamp_precision()  are used for creating a pcap_t structure to use when calling the other func-
       tions in libpcap.  It is typically used when just using libpcap for compiling BPF code; it can also  be	used  if  using  pcap_dump_open(),
       pcap_dump(), and pcap_dump_close() to write a savefile if there is no pcap_t that supplies the packets to be written.

       linktype specifies the link-layer type for the pcap_t.

       snaplen specifies the snapshot length for the pcap_t.

       When  pcap_open_dead_with_tstamp_precision(),  is used to create a pcap_t for use with pcap_dump_open(), precision specifies the time stamp
       precision for packets; PCAP_TSTAMP_PRECISION_MICRO should be specified if the packets to  be  written  have  time  stamps  in  seconds  and
       microseconds,  and PCAP_TSTAMP_PRECISION_NANO should be specified if the packets to be written have time stamps in seconds and nanoseconds.
       Its value does not affect pcap_compile().

SEE ALSO

       pcap(3), pcap_compile(3), pcap_dump_open(3), pcap-linktype(7)

								    1 July 2013 						 PCAP_OPEN_DEAD(3)

PCAP_DUMP_OPEN(3PCAP)													     PCAP_DUMP_OPEN(3PCAP)

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  snap-
       shot 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@)

								 16 February 2015					     PCAP_DUMP_OPEN(3PCAP)