github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/test/syscalls/linux/unshare.cc (about)

     1  // Copyright 2018 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  #include <errno.h>
    16  #include <sched.h>
    17  
    18  #include "gmock/gmock.h"
    19  #include "gtest/gtest.h"
    20  #include "absl/synchronization/mutex.h"
    21  #include "test/util/test_util.h"
    22  #include "test/util/thread_util.h"
    23  
    24  namespace gvisor {
    25  namespace testing {
    26  
    27  namespace {
    28  
    29  TEST(UnshareTest, AllowsZeroFlags) {
    30    ASSERT_THAT(unshare(0), SyscallSucceeds());
    31  }
    32  
    33  TEST(UnshareTest, ThreadFlagFailsIfMultithreaded) {
    34    absl::Mutex mu;
    35    bool finished = false;
    36    ScopedThread t([&] {
    37      mu.Lock();
    38      mu.Await(absl::Condition(&finished));
    39      mu.Unlock();
    40    });
    41    ASSERT_THAT(unshare(CLONE_THREAD), SyscallFailsWithErrno(EINVAL));
    42    mu.Lock();
    43    finished = true;
    44    mu.Unlock();
    45  }
    46  
    47  }  // namespace
    48  
    49  }  // namespace testing
    50  }  // namespace gvisor