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PCAP_OPEN_OFFLINE(3)                                PCAP_OPEN_OFFLINE(3)


       pcap_open_offline, pcap_open_offline_with_tstamp_precision,
       pcap_fopen_offline, pcap_fopen_offline_with_tstamp_precision - open a
       saved capture file for reading


       #include <pcap/pcap.h>

       char errbuf[PCAP_ERRBUF_SIZE];

       pcap_t *pcap_open_offline(const char *fname, char *errbuf);
       pcap_open_offline_with_tstamp_precision(3) 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);


       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 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.


       pcap_open_offline(), pcap_open_offline_with_tstamp_precision(),
       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.


       pcap_open_offline_with_tstamp_precision() and
       pcap_fopen_offline_with_tstamp_precision() became available in libpcap
       release 1.5.1.  In previous releases, time stamps from a savefile are
       always given in seconds and microseconds.


       pcap(3), pcap-savefile(5)

                                 23 August 2018         PCAP_OPEN_OFFLINE(3)

libpcap 1.10.2 - Generated Mon Jan 2 05:45:27 CST 2023
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