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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <errno.h>
#include <sched.h>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/synchronization/mutex.h"
#include "test/util/test_util.h"
#include "test/util/thread_util.h"
namespace gvisor {
namespace testing {
namespace {
TEST(UnshareTest, AllowsZeroFlags) {
ASSERT_THAT(unshare(0), SyscallSucceeds());
}
TEST(UnshareTest, ThreadFlagFailsIfMultithreaded) {
absl::Mutex mu;
bool finished = false;
ScopedThread t([&] {
mu.Lock();
mu.Await(absl::Condition(&finished));
mu.Unlock();
});
ASSERT_THAT(unshare(CLONE_THREAD), SyscallFailsWithErrno(EINVAL));
mu.Lock();
finished = true;
mu.Unlock();
}
} // namespace
} // namespace testing
} // namespace gvisor
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