pcap_open_offline() and pcap_open_offline_with_tstamp_precision() are
called to open a ``savefile'' for reading.
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 pcap-ng file format, although not all pcap-ng 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 additionalprecision argument as described above. Note that on Windows, that
stream should be opened in binary mode.
pcap_fopen_offline(), and pcap_fopen_offline_with_tstamp_precision()
return a 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.
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 2017-04-25. If
you discover any rendering problems in this HTML version of the page,
or you believe there is a better 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 email@example.com
3 January 2014 PCAP_OPEN_OFFLINE(3PCAP)