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.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 (@MAN_FILE_FORMATS@),
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(@MAN_FILE_FORMATS@)