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.\" @(#) $Header: /tcpdump/master/libpcap/pcap_open_offline.3pcap.in,v 1.1 2008-10-23 05:56:59 guy Exp $
.\"
.\" 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 "5 April 2008"
.SH NAME
pcap_open_offline, pcap_fopen_offline \- 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_fopen_offline(FILE *fp, char *errbuf);
.ft
.fi
.SH DESCRIPTION
.B pcap_open_offline()
is 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 (5),
which is the file format used by, among other programs,
.BR tcpdump (1)
and
.BR 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
.BR stdin .
.PP
Alternatively, you may call
.B pcap_fopen_offline()
to read dumped data from an existing open stream
.IR fp .
Note that on Windows, that stream should be opened in binary mode.
.SH RETURN VALUE
.B pcap_open_offline()
and
.B pcap_fopen_offline()
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 SEE ALSO
pcap(3PCAP), pcap-savefile(5)
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