pcap_open_offline(3PCAP) man page
This man page documents libpcap version 1.11.0-PRE-GIT (see also: 1.10.2, 1.10.1, 1.10.0, 1.9.1, 1.9.0, 1.8.1, 1.7.4, 1.6.2, 1.5.3).
Your system may have a different version installed, possibly with some local modifications. To achieve the best results, please make sure this version of this man page suits your needs. If necessary, try to look for a different version on this web site or in the man pages available in your installation.NAME
SYNOPSIS
#include <pcap/pcap.h>
char errbuf[PCAP_ERRBUF_SIZE];
pcap_t *pcap_open_offline(const char *fname, char *errbuf);
pcap_t *pcap_open_offline_with_tstamp_precision(const char *fname,
u_int precision, char *errbuf);
pcap_t *pcap_fopen_offline(FILE *fp, char *errbuf);
pcap_t *pcap_fopen_offline_with_tstamp_precision(FILE *fp,
u_int precision, char *errbuf);
DESCRIPTION
fname
specifies the name of the file to open. The file can have the pcap file
format as described in
pcap-savefile(5),
which is the file format used by, among other programs,
tcpdump(1)
and
tcpslice(1),
or can have the pcapng file format, although not all pcapng files can
be read.
The name "-" is a synonym for
stdin.
pcap_open_offline_with_tstamp_precision()
takes an additional
precision
argument specifying the time stamp precision desired;
if
PCAP_TSTAMP_PRECISION_MICRO
is specified, packet time stamps will be supplied in seconds and
microseconds,
and if
PCAP_TSTAMP_PRECISION_NANO
is specified, packet time stamps will be supplied in seconds and
nanoseconds. If the time stamps in the file do not have the same
precision as the requested precision, they will be scaled up or down as
necessary before being supplied.
Alternatively, you may call pcap_fopen_offline() or pcap_fopen_offline_with_tstamp_precision() to read dumped data from an existing open stream fp. pcap_fopen_offline_with_tstamp_precision() takes an additional precision argument as described above. Note that on Windows, that stream should be opened in binary mode.
RETURN VALUE
pcap_t *
on success and
NULL
on failure.
If
NULL
is returned,
errbuf
is filled in with an appropriate error message.
errbuf
is assumed to be able to hold at least
PCAP_ERRBUF_SIZE
chars.