github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/test/syscalls/linux/vsyscall.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 <time.h>
    17  
    18  #include "gtest/gtest.h"
    19  #include "test/util/proc_util.h"
    20  #include "test/util/test_util.h"
    21  
    22  namespace gvisor {
    23  namespace testing {
    24  
    25  namespace {
    26  
    27  #if defined(__x86_64__) || defined(__i386__)
    28  time_t vsyscall_time(time_t* t) {
    29    constexpr uint64_t kVsyscallTimeEntry = 0xffffffffff600400;
    30    return reinterpret_cast<time_t (*)(time_t*)>(kVsyscallTimeEntry)(t);
    31  }
    32  
    33  TEST(VsyscallTest, VsyscallAlwaysAvailableOnGvisor) {
    34    SKIP_IF(!IsRunningOnGvisor());
    35    // Vsyscall is always advertised by gvisor.
    36    EXPECT_TRUE(ASSERT_NO_ERRNO_AND_VALUE(IsVsyscallEnabled()));
    37    // Vsyscall should always works on gvisor.
    38    time_t t;
    39    EXPECT_THAT(vsyscall_time(&t), SyscallSucceeds());
    40  }
    41  #endif
    42  
    43  }  // namespace
    44  
    45  }  // namespace testing
    46  }  // namespace gvisor