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PCAP_DUMP_OPEN

Section: Misc. Reference Manual Pages (3PCAP)
Updated: 5 April 2008
Index Return to Main Contents
 

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)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
SEE ALSO


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