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+.\" Copyright (c) 1994, 1996, 1997
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that: (1) source code distributions
+.\" retain the above copyright notice and this paragraph in its entirety, (2)
+.\" distributions including binary code include the above copyright notice and
+.\" this paragraph in its entirety in the documentation or other materials
+.\" provided with the distribution, and (3) all advertising materials mentioning
+.\" features or use of this software display the following acknowledgement:
+.\" ``This product includes software developed by the University of California,
+.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+.\" the University nor the names of its contributors may be used to endorse
+.\" or promote products derived from this software without specific prior
+.\" written permission.
+.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+.\"
+.TH PCAP_OPEN_OFFLINE 3PCAP "8 January 2018 "
+.SH NAME
+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
+.SH SYNOPSIS
+.nf
+.ft B
+#include <pcap/pcap.h>
+.ft
+.LP
+.nf
+.ft B
+char errbuf[PCAP_ERRBUF_SIZE];
+.ft
+.LP
+.ft B
+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);
+.ft
+.fi
+.SH DESCRIPTION
+.B pcap_open_offline()
+and
+.B pcap_open_offline_with_tstamp_precision()
+are called to open a ``savefile'' for reading.
+.PP
+.I fname
+specifies the name of the file to open. The file can have the pcap file
+format as described in
+.BR pcap-savefile (@MAN_FILE_FORMATS@),
+which is the file format used by, among other programs,
+.BR tcpdump (1)
+and
+.BR tcpslice (1),
+or can have the pcapng file format, although not all pcapng files can
+be read.
+The name "-" is a synonym for
+.BR stdin .
+.PP
+.B pcap_open_offline_with_tstamp_precision()
+takes an additional
+.I precision
+argument specifying the time stamp precision desired;
+if
+.B PCAP_TSTAMP_PRECISION_MICRO
+is specified, packet time stamps will be supplied in seconds and
+microseconds,
+and if
+.B 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.
+.PP
+Alternatively, you may call
+.B pcap_fopen_offline()
+or
+.B pcap_fopen_offline_with_tstamp_precision()
+to read dumped data from an existing open stream
+.IR fp .
+.B pcap_fopen_offline_with_tstamp_precision()
+takes an additional
+.I precision
+argument as described above.
+Note that on Windows, that stream should be opened in binary mode.
+.SH RETURN VALUE
+.BR pcap_open_offline() ,
+.BR pcap_open_offline_with_tstamp_precision() ,
+.BR pcap_fopen_offline() ,
+and
+.B pcap_fopen_offline_with_tstamp_precision()
+return a
+.I pcap_t *
+on success and
+.B NULL
+on failure.
+If
+.B NULL
+is returned,
+.I errbuf
+is filled in with an appropriate error message.
+.I errbuf
+is assumed to be able to hold at least
+.B PCAP_ERRBUF_SIZE
+chars.
+.SH BACKWARD COMPATIBILITY
+.B pcap_open_offline_with_tstamp_precision
+and
+.B 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.
+.SH SEE ALSO
+pcap(3PCAP), pcap-savefile(@MAN_FILE_FORMATS@)