NetBSD 6.1.5 - man page for pcap_open_offline (netbsd section 3)
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pcap_open_offline, pcap_fopen_offline - open a saved capture file for reading
pcap_t *pcap_open_offline(const char *fname, char *errbuf);
pcap_t *pcap_fopen_offline(FILE *fp, char *errbuf);
pcap_open_offline() is 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(8) and tcpslice(1), or can have the pcap-ng file format, although not all pcap-ng
files can be read. The name "-" in a synonym for stdin.
Alternatively, you may call pcap_fopen_offline() to read dumped data from an existing open
stream fp. Note that on Windows, that stream should be opened in binary mode.
pcap_open_offline() and pcap_fopen_offline() 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.
5 April 2008 PCAP_OPEN_OFFLINE(3)
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