github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/test/syscalls/linux/munmap.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 <sys/mman.h>
    16  
    17  #include "gtest/gtest.h"
    18  #include "test/util/test_util.h"
    19  
    20  namespace gvisor {
    21  namespace testing {
    22  
    23  namespace {
    24  
    25  class MunmapTest : public ::testing::Test {
    26   protected:
    27    void SetUp() override {
    28      m_ = mmap(nullptr, kPageSize, PROT_READ | PROT_WRITE,
    29                MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
    30      ASSERT_NE(MAP_FAILED, m_);
    31    }
    32  
    33    void* m_ = nullptr;
    34  };
    35  
    36  TEST_F(MunmapTest, HappyCase) {
    37    EXPECT_THAT(munmap(m_, kPageSize), SyscallSucceeds());
    38  }
    39  
    40  TEST_F(MunmapTest, ZeroLength) {
    41    EXPECT_THAT(munmap(m_, 0), SyscallFailsWithErrno(EINVAL));
    42  }
    43  
    44  TEST_F(MunmapTest, LastPageRoundUp) {
    45    // Attempt to unmap up to and including the last page.
    46    EXPECT_THAT(munmap(m_, static_cast<size_t>(-kPageSize + 1)),
    47                SyscallFailsWithErrno(EINVAL));
    48  }
    49  
    50  }  // namespace
    51  
    52  }  // namespace testing
    53  }  // namespace gvisor