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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | BACKWARD COMPATIBILITY | SEE ALSO | COLOPHON |
PCAP_DUMP_OPEN(3PCAP) PCAP_DUMP_OPEN(3PCAP)
pcap_dump_open, pcap_dump_open_append, pcap_dump_fopen - open a file
to which to write packets
#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);
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). If the file does
not exist, it will be created; if the file exists, it will be
truncated and overwritten. 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(3PCAP). The stream is assumped to be at the
beginning of a file that has been newly created or truncated, so that
writes will start at the beginning of the file. 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(3PCAP) and activated by an earlier call to
pcap_activate(3PCAP), or returned by an earlier call to
pcap_open_offline(3PCAP), pcap_open_live(3PCAP), or
pcap_open_dead(3PCAP). 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, if the file
already exists, 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.
A pointer to a pcap_dumper_t structure to use in subsequent
pcap_dump(3PCAP) and pcap_dump_close(3PCAP) calls is returned on
success. NULL is returned on failure. If NULL is returned,
pcap_geterr(3PCAP) can be used to get the error text.
The pcap_dump_open_append() function became available in libpcap
release 1.7.2. In previous releases, there is no support for
appending packets to an existing savefile.
pcap(3PCAP), pcap-savefile(5)
This page is part of the libpcap (packet capture library) project.
Information about the project can be found at
⟨http://www.tcpdump.org/⟩. If you have a bug report for this manual
page, see ⟨http://www.tcpdump.org/#patches⟩. This page was obtained
from the project's upstream Git repository
⟨https://github.com/the-tcpdump-group/libpcap.git⟩ on 2020-08-13.
(At that time, the date of the most recent commit that was found in
the repository was 2020-08-10.) If you discover any rendering prob‐
lems in this HTML version of the page, or you believe there is a bet‐
ter or more up-to-date source for the page, or you have corrections
or improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to man-pages@man7.org
3 July 2020 PCAP_DUMP_OPEN(3PCAP)