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+// Copyright 2015 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+// notice, this list of conditions and the following disclaimer in the
+// documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// \file integration/helpers/race.cpp
+/// Creates a file and reads it back, looking for races.
+///
+/// This program should fail with high chances if it is called multiple times at
+/// once with TEST_ENV_shared_file pointing to the same file.
+
+extern "C" {
+#include <sys/types.h>
+
+#include <unistd.h>
+}
+
+#include <cstdlib>
+#include <fstream>
+#include <iostream>
+
+#include "utils/format/macros.hpp"
+#include "utils/fs/operations.hpp"
+#include "utils/fs/path.hpp"
+#include "utils/env.hpp"
+#include "utils/optional.ipp"
+#include "utils/stream.hpp"
+
+namespace fs = utils::fs;
+
+using utils::optional;
+
+
+/// Entry point to the helper test program.
+///
+/// \return EXIT_SUCCESS if no race is detected; EXIT_FAILURE otherwise.
+int
+main(void)
+{
+ const optional< std::string > shared_file = utils::getenv(
+ "TEST_ENV_shared_file");
+ if (!shared_file) {
+ std::cerr << "Environment variable TEST_ENV_shared_file not defined\n";
+ std::exit(EXIT_FAILURE);
+ }
+ const fs::path shared_path(shared_file.get());
+
+ if (fs::exists(shared_path)) {
+ std::cerr << "Shared file already exists; created by a concurrent "
+ "test?";
+ std::exit(EXIT_FAILURE);
+ }
+
+ const std::string contents = F("%s") % ::getpid();
+
+ std::ofstream output(shared_path.c_str());
+ if (!output) {
+ std::cerr << "Failed to create shared file; conflict with a concurrent "
+ "test?";
+ std::exit(EXIT_FAILURE);
+ }
+ output << contents;
+ output.close();
+
+ ::usleep(10000);
+
+ const std::string read_contents = utils::read_file(shared_path);
+ if (read_contents != contents) {
+ std::cerr << "Shared file contains unexpected contents; modified by a "
+ "concurrent test?";
+ std::exit(EXIT_FAILURE);
+ }
+
+ fs::unlink(shared_path);
+ std::exit(EXIT_SUCCESS);
+}