pcap_dump_ftell(3) pcap_dump_ftell(3)
NAME
pcap_dump_ftell, pcap_dump_ftell64 - get the current file offset for a
savefile being written
SYNOPSIS
#include <pcap/pcap.h>
pcap_dump_ftell(3) *p);
int64_t pcap_dump_ftell64(pcap_dumper_t *p);
DESCRIPTION
pcap_dump_ftell() returns the current file position for the
``savefile'', representing the number of bytes written by
pcap_dump_open(3) and pcap_dump(3). PCAP_ERROR is returned on
error. If the current file position does not fit in a long, it will be
truncated; this can happen on 32-bit UNIX-like systems with large file
support and on Windows. pcap_dump_ftell64() returns the current file
position in a int64_t, so if file offsets that don't fit in a long but
that fit in a int64_t are supported, this will return the file offset
without truncation. PCAP_ERROR is returned on error.
BACKWARD COMPATIBILITY
The function pcap_dump_ftell64() became available in libpcap release
1.9.0. In previous releases, there was no mechanism to obtain a file
offset that is too large to fit in a long.
SEE ALSO
pcap(3)
25 July 2018 pcap_dump_ftell(3)
libpcap 1.11.0 - Generated Mon Sep 14 16:05:47 CDT 2026