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#-*- perl -*-
#
# Copyright (C) 2001 Ken'ichi Fukamachi
# All rights reserved. This program is free software; you can
# redistribute it and/or modify it under the same terms as Perl itself.
#
# $FML: file_map_getpos.pl,v 1.5 2001/05/04 14:32:34 fukachan Exp $
#
use strict;
use Carp;
my $debug = 0;
my $file = "/etc/passwd";
my $map = "file:". $file;
print STDERR "roll back test\n" if $debug;
use IO::Adapter;
my $obj = new IO::Adapter $map;
$obj->open || croak("cannot open $map");
if ($obj->error) { croak( $obj->error );}
my $pobot = 0;
my $done = 0;
my $i = 0;
my $pebot = 0;
my ($x, $prev_buf, $buf);
while ($x = $obj->getline) {
$i++;
if ($i == 4 || $i == 7) {
print STDERR " > ", $x if $debug;
unless ($prev_buf) {
$prev_buf = $x;
}
$buf = $x;
}
if ($i == 3) {
$pebot = $obj->getpos;
print STDERR " * roll back here\n" if $debug;
}
my $pos = $obj->getpos;
unless ($done) {
if ($i == 6) {
print STDERR " now> ", $x if $debug;;
print STDERR " * try to roll back ... \n" if $debug;;
$obj->setpos( $pebot );
$done = 1;
}
}
}
$obj->close;
if ($prev_buf eq $buf) {
print STDERR "$map roll back test ... ok\n";
exit 0;
}
else {
exit 1;
}
exit 0;
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