84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdint.h>
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#include <sys/time.h>
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#include <syscall.h>
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#include <time.h>
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#include <unistd.h>
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#include <map>
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#include <string>
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#include <utility>
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "absl/strings/numbers.h"
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#include "absl/time/clock.h"
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#include "absl/time/time.h"
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#include "test/util/test_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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std::string PrintClockId(::testing::TestParamInfo<clockid_t> info) {
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switch (info.param) {
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case CLOCK_MONOTONIC:
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return "CLOCK_MONOTONIC";
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case CLOCK_BOOTTIME:
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return "CLOCK_BOOTTIME";
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default:
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return absl::StrCat(info.param);
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}
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}
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class MonotonicVDSOClockTest : public ::testing::TestWithParam<clockid_t> {};
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TEST_P(MonotonicVDSOClockTest, IsCorrect) {
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// The VDSO implementation of clock_gettime() uses the TSC. On KVM, sentry and
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// application TSCs can be very desynchronized; see
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// sentry/platform/kvm/kvm.vCPU.setSystemTime().
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SKIP_IF(GvisorPlatform() == Platform::kKVM);
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// Check that when we alternate readings from the clock_gettime syscall and
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// the VDSO's implementation, we observe the combined sequence as being
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// monotonic.
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struct timespec tvdso, tsys;
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absl::Time vdso_time, sys_time;
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ASSERT_THAT(syscall(__NR_clock_gettime, GetParam(), &tsys),
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SyscallSucceeds());
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sys_time = absl::TimeFromTimespec(tsys);
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auto end = absl::Now() + absl::Seconds(10);
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while (absl::Now() < end) {
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ASSERT_THAT(clock_gettime(GetParam(), &tvdso), SyscallSucceeds());
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vdso_time = absl::TimeFromTimespec(tvdso);
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EXPECT_LE(sys_time, vdso_time);
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ASSERT_THAT(syscall(__NR_clock_gettime, GetParam(), &tsys),
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SyscallSucceeds());
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sys_time = absl::TimeFromTimespec(tsys);
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EXPECT_LE(vdso_time, sys_time);
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}
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}
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INSTANTIATE_TEST_SUITE_P(ClockGettime, MonotonicVDSOClockTest,
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::testing::Values(CLOCK_MONOTONIC, CLOCK_BOOTTIME),
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PrintClockId);
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} // namespace
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} // namespace testing
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} // namespace gvisor
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