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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_DUMP_FTELL 3PCAP "25 July 2018"
+.SH NAME
+pcap_dump_ftell, pcap_dump_ftell64 \- get the current file offset for a savefile being written
+.SH SYNOPSIS
+.nf
+.ft B
+#include <pcap/pcap.h>
+.ft
+.LP
+.ft B
+long pcap_dump_ftell(pcap_dumper_t *p);
+.ft B
+int64_t pcap_dump_ftell64(pcap_dumper_t *p);
+.ft
+.fi
+.SH DESCRIPTION
+.B pcap_dump_ftell()
+returns the current file position for the ``savefile'', representing the
+number of bytes written by
+.B pcap_dump_open(3PCAP)
+and
+.BR pcap_dump(3PCAP) .
+.B PCAP_ERROR
+is returned on error. If the current file position does not fit in a
+.BR long ,
+it will be truncated; this can happen on 32-bit UNIX-like systems with
+large file support and on Windows.
+.B pcap_dump_ftell64()
+returns the current file position in a
+.BR int64_t ,
+so if file offsets that don't fit in a
+.B long
+but that fit in a
+.B int64_t
+are supported, this will return the file offset without truncation.
+.B PCAP_ERROR
+is returned on error.
+.SH SEE ALSO
+pcap(3PCAP)