use File::Tail;

my $cur_filename

$SIG{'INT'} = sub {
    if (-e ($cur_filename = "/tmp/filename")) {
        $NEWFILE = 1
    } else {
        die "Cannot open file:$!"
    }

};
    
$cur_filename=$ARGV[0];

while (1) {


my $file=File::Tail->new(name        => $cur_filename, 
                         maxinterval => 3,
                         adjustafter => 2, 
                         tail        => -1);

    while (defined($line=$file->read)) {
        print $line;
        last if $NEWFILE;
    }
    $NEWFILE = 0
}