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// 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 <time.h>
#include <atomic>
#include <utility>
#include "gtest/gtest.h"
#include "absl/time/time.h"
#include "test/util/cleanup.h"
#include "test/util/posix_error.h"
#include "test/util/signal_util.h"
#include "test/util/test_util.h"
#include "test/util/thread_util.h"
#include "test/util/timer_util.h"
namespace gvisor {
namespace testing {
namespace {
// sys_clock_nanosleep is defined because the glibc clock_nanosleep returns
// error numbers directly and does not set errno. This makes our Syscall
// matchers look a little weird when expecting failure:
// "SyscallSucceedsWithValue(ERRNO)".
int sys_clock_nanosleep(clockid_t clkid, int flags,
const struct timespec* request,
struct timespec* remain) {
return syscall(SYS_clock_nanosleep, clkid, flags, request, remain);
}
PosixErrorOr<absl::Time> GetTime(clockid_t clk) {
struct timespec ts = {};
const int rc = clock_gettime(clk, &ts);
MaybeSave();
if (rc < 0) {
return PosixError(errno, "clock_gettime");
}
return absl::TimeFromTimespec(ts);
}
class WallClockNanosleepTest : public ::testing::TestWithParam<clockid_t> {};
TEST_P(WallClockNanosleepTest, InvalidValues) {
const struct timespec invalid[] = {
{.tv_sec = -1, .tv_nsec = -1}, {.tv_sec = 0, .tv_nsec = INT32_MIN},
{.tv_sec = 0, .tv_nsec = INT32_MAX}, {.tv_sec = 0, .tv_nsec = -1},
{.tv_sec = -1, .tv_nsec = 0},
};
for (auto const ts : invalid) {
EXPECT_THAT(sys_clock_nanosleep(GetParam(), 0, &ts, nullptr),
SyscallFailsWithErrno(EINVAL));
}
}
TEST_P(WallClockNanosleepTest, SleepOneSecond) {
constexpr absl::Duration kSleepDuration = absl::Seconds(1);
struct timespec duration = absl::ToTimespec(kSleepDuration);
const absl::Time before = ASSERT_NO_ERRNO_AND_VALUE(GetTime(GetParam()));
EXPECT_THAT(
RetryEINTR(sys_clock_nanosleep)(GetParam(), 0, &duration, &duration),
SyscallSucceeds());
const absl::Time after = ASSERT_NO_ERRNO_AND_VALUE(GetTime(GetParam()));
EXPECT_GE(after - before, kSleepDuration);
}
TEST_P(WallClockNanosleepTest, InterruptedNanosleep) {
constexpr absl::Duration kSleepDuration = absl::Seconds(60);
struct timespec duration = absl::ToTimespec(kSleepDuration);
// Install no-op signal handler for SIGALRM.
struct sigaction sa = {};
sigfillset(&sa.sa_mask);
sa.sa_handler = +[](int signo) {};
const auto cleanup_sa =
ASSERT_NO_ERRNO_AND_VALUE(ScopedSigaction(SIGALRM, sa));
// Measure time since setting the alarm, since the alarm will interrupt the
// sleep and hence determine how long we sleep.
const absl::Time before = ASSERT_NO_ERRNO_AND_VALUE(GetTime(GetParam()));
// Set an alarm to go off while sleeping.
struct itimerval timer = {};
timer.it_value.tv_sec = 1;
timer.it_value.tv_usec = 0;
timer.it_interval.tv_sec = 1;
timer.it_interval.tv_usec = 0;
const auto cleanup =
ASSERT_NO_ERRNO_AND_VALUE(ScopedItimer(ITIMER_REAL, timer));
EXPECT_THAT(sys_clock_nanosleep(GetParam(), 0, &duration, &duration),
SyscallFailsWithErrno(EINTR));
const absl::Time after = ASSERT_NO_ERRNO_AND_VALUE(GetTime(GetParam()));
// Remaining time updated.
const absl::Duration remaining = absl::DurationFromTimespec(duration);
EXPECT_GE(after - before + remaining, kSleepDuration);
}
// Remaining time is *not* updated if nanosleep completes uninterrupted.
TEST_P(WallClockNanosleepTest, UninterruptedNanosleep) {
constexpr absl::Duration kSleepDuration = absl::Milliseconds(10);
const struct timespec duration = absl::ToTimespec(kSleepDuration);
while (true) {
constexpr int kRemainingMagic = 42;
struct timespec remaining;
remaining.tv_sec = kRemainingMagic;
remaining.tv_nsec = kRemainingMagic;
int ret = sys_clock_nanosleep(GetParam(), 0, &duration, &remaining);
if (ret == EINTR) {
// Retry from beginning. We want a single uninterrupted call.
continue;
}
EXPECT_THAT(ret, SyscallSucceeds());
EXPECT_EQ(remaining.tv_sec, kRemainingMagic);
EXPECT_EQ(remaining.tv_nsec, kRemainingMagic);
break;
}
}
TEST_P(WallClockNanosleepTest, SleepUntil) {
const absl::Time now = ASSERT_NO_ERRNO_AND_VALUE(GetTime(GetParam()));
const absl::Time until = now + absl::Seconds(2);
const struct timespec ts = absl::ToTimespec(until);
EXPECT_THAT(
RetryEINTR(sys_clock_nanosleep)(GetParam(), TIMER_ABSTIME, &ts, nullptr),
SyscallSucceeds());
const absl::Time after = ASSERT_NO_ERRNO_AND_VALUE(GetTime(GetParam()));
EXPECT_GE(after, until);
}
INSTANTIATE_TEST_SUITE_P(Sleepers, WallClockNanosleepTest,
::testing::Values(CLOCK_REALTIME, CLOCK_MONOTONIC));
TEST(ClockNanosleepProcessTest, SleepFiveSeconds) {
const absl::Duration kSleepDuration = absl::Seconds(5);
struct timespec duration = absl::ToTimespec(kSleepDuration);
// Ensure that CLOCK_PROCESS_CPUTIME_ID advances.
std::atomic<bool> done(false);
ScopedThread t([&] {
while (!done.load()) {
}
});
const auto cleanup_done = Cleanup([&] { done.store(true); });
const absl::Time before =
ASSERT_NO_ERRNO_AND_VALUE(GetTime(CLOCK_PROCESS_CPUTIME_ID));
EXPECT_THAT(RetryEINTR(sys_clock_nanosleep)(CLOCK_PROCESS_CPUTIME_ID, 0,
&duration, &duration),
SyscallSucceeds());
const absl::Time after =
ASSERT_NO_ERRNO_AND_VALUE(GetTime(CLOCK_PROCESS_CPUTIME_ID));
EXPECT_GE(after - before, kSleepDuration);
}
} // namespace
} // namespace testing
} // namespace gvisor
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