// 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