#!/usr/bin/env perl
# mt-aws-glacier - Amazon Glacier sync client
# Copyright (C) 2012-2014 Victor Efimov
# http://mt-aws.com (also http://vs-dev.com) vs@vs-dev.com
# License: GPLv3
#
# This file is part of "mt-aws-glacier"
#
# mt-aws-glacier is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# mt-aws-glacier is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
use strict;
use warnings;
use Test::More tests => 1;
use FindBin;
use lib map { "$FindBin::RealBin/$_" } qw{../lib ../../lib};
use TestUtils 'w_fatal';
use App::MtAws::Utils;
use Carp;
use Fcntl qw/SEEK_SET LOCK_EX LOCK_UN SEEK_SET/;
use IO::Pipe;
use Time::HiRes qw/usleep/;
my $mtroot = get_temp_dir();
my $filename = "$mtroot/testlock";
open F, ">$filename";
print F 1;
close F;
my $fromchild = new IO::Pipe;
my $tochild = new IO::Pipe;
sub _flock { flock($_[0], $_[1]); }
if (fork()) {
$fromchild->reader();
$fromchild->autoflush(1);
$fromchild->blocking(1);
binmode $fromchild;
$tochild->writer();
$tochild->autoflush(1);
$tochild->blocking(1);
binmode $tochild;
open_file(my $fh, $filename, mode => '+<', binary => 1);
print $tochild "open\n";
_flock $fh, LOCK_EX or confess;
$fh->flush();
$fh->autoflush(1);
print $fh "1234\n";
print $tochild "lock\n";
usleep(300);
seek $fh, 0, SEEK_SET;
print $fh "ABCD\n";
flock $fh, LOCK_UN or confess;
is scalar <$fromchild>, "OK\n"
} else {
$fromchild->writer();
$fromchild->autoflush(1);
$fromchild->blocking(1);
binmode $fromchild;
$tochild->reader();
$tochild->autoflush(1);
$tochild->blocking(1);
binmode $tochild;
confess unless (scalar <$tochild> eq "open\n");
open_file(my $fh, $filename, mode => '+<', binary => 1) or confess;
confess unless (scalar <$tochild> eq "lock\n");
_flock $fh, LOCK_EX or confess;
$fh->flush();
$fh->autoflush(1);
seek $fh, 0, SEEK_SET;
confess unless (scalar <$fh> eq "ABCD\n");
print $fromchild "OK\n";
usleep(300); # protect parent from SIGCHLD
}
1;