1 files changed, 0 insertions, 366 deletions
diff --git a/test/syscalls/linux/itimer.cc b/test/syscalls/linux/itimer.cc
deleted file mode 100644
index e397d5f57..000000000
--- a/test/syscalls/linux/itimer.cc
+++ /dev/null
@@ -1,366 +0,0 @@
-// 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 <signal.h>
-#include <sys/socket.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <time.h>
-
-#include <atomic>
-#include <functional>
-#include <iostream>
-#include <vector>
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-#include "absl/strings/string_view.h"
-#include "absl/time/clock.h"
-#include "absl/time/time.h"
-#include "test/util/file_descriptor.h"
-#include "test/util/logging.h"
-#include "test/util/multiprocess_util.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 {
-
-constexpr char kSIGALRMToMainThread[] = "--itimer_sigarlm_to_main_thread";
-constexpr char kSIGPROFFairnessActive[] = "--itimer_sigprof_fairness_active";
-constexpr char kSIGPROFFairnessIdle[] = "--itimer_sigprof_fairness_idle";
-
-// Time period to be set for the itimers.
-constexpr absl::Duration kPeriod = absl::Milliseconds(25);
-// Total amount of time to spend per thread.
-constexpr absl::Duration kTestDuration = absl::Seconds(20);
-// Amount of spin iterations to perform as the minimum work item per thread.
-// Chosen to be sub-millisecond range.
-constexpr int kIterations = 10000000;
-// Allow deviation in the number of samples.
-constexpr double kNumSamplesDeviationRatio = 0.2;
-
-TEST(ItimerTest, ItimervalUpdatedBeforeExpiration) {
-  constexpr int kSleepSecs = 10;
-  constexpr int kAlarmSecs = 15;
-  static_assert(
-      kSleepSecs < kAlarmSecs,
-      "kSleepSecs must be less than kAlarmSecs for the test to be meaningful");
-  constexpr int kMaxRemainingSecs = kAlarmSecs - kSleepSecs;
-
-  // Install a no-op handler for SIGALRM.
-  struct sigaction sa = {};
-  sigfillset(&sa.sa_mask);
-  sa.sa_handler = +[](int signo) {};
-  auto const cleanup_sa =
-      ASSERT_NO_ERRNO_AND_VALUE(ScopedSigaction(SIGALRM, sa));
-
-  // Set an itimer-based alarm for kAlarmSecs from now.
-  struct itimerval itv = {};
-  itv.it_value.tv_sec = kAlarmSecs;
-  auto const cleanup_itimer =
-      ASSERT_NO_ERRNO_AND_VALUE(ScopedItimer(ITIMER_REAL, itv));
-
-  // After sleeping for kSleepSecs, the itimer value should reflect the elapsed
-  // time even if it hasn't expired.
-  absl::SleepFor(absl::Seconds(kSleepSecs));
-  ASSERT_THAT(getitimer(ITIMER_REAL, &itv), SyscallSucceeds());
-  EXPECT_TRUE(
-      itv.it_value.tv_sec < kMaxRemainingSecs ||
-      (itv.it_value.tv_sec == kMaxRemainingSecs && itv.it_value.tv_usec == 0))
-      << "Remaining time: " << itv.it_value.tv_sec << " seconds + "
-      << itv.it_value.tv_usec << " microseconds";
-}
-
-ABSL_CONST_INIT static thread_local std::atomic_int signal_test_num_samples =
-    ATOMIC_VAR_INIT(0);
-
-void SignalTestSignalHandler(int /*signum*/) { signal_test_num_samples++; }
-
-struct SignalTestResult {
-  int expected_total;
-  int main_thread_samples;
-  std::vector<int> worker_samples;
-};
-
-std::ostream& operator<<(std::ostream& os, const SignalTestResult& r) {
-  os << "{expected_total: " << r.expected_total
-     << ", main_thread_samples: " << r.main_thread_samples
-     << ", worker_samples: [";
-  bool first = true;
-  for (int sample : r.worker_samples) {
-    if (!first) {
-      os << ", ";
-    }
-    os << sample;
-    first = false;
-  }
-  os << "]}";
-  return os;
-}
-
-// Starts two worker threads and itimer id and measures the number of signal
-// delivered to each thread.
-SignalTestResult ItimerSignalTest(int id, clock_t main_clock,
-                                  clock_t worker_clock, int signal,
-                                  absl::Duration sleep) {
-  signal_test_num_samples = 0;
-
-  struct sigaction sa = {};
-  sa.sa_handler = &SignalTestSignalHandler;
-  sa.sa_flags = SA_RESTART;
-  sigemptyset(&sa.sa_mask);
-  auto sigaction_cleanup = ScopedSigaction(signal, sa).ValueOrDie();
-
-  int socketfds[2];
-  TEST_PCHECK(socketpair(AF_UNIX, SOCK_STREAM, 0, socketfds) == 0);
-
-  // Do the spinning in the workers.
-  std::function<void*(int)> work = [&](int socket_fd) {
-    FileDescriptor fd(socket_fd);
-
-    absl::Time finish = Now(worker_clock) + kTestDuration;
-    while (Now(worker_clock) < finish) {
-      // Blocked on read.
-      char c;
-      RetryEINTR(read)(fd.get(), &c, 1);
-      for (int i = 0; i < kIterations; i++) {
-        // Ensure compiler won't optimize this loop away.
-        asm("");
-      }
-
-      if (sleep != absl::ZeroDuration()) {
-        // Sleep so that the entire process is idle for a while.
-        absl::SleepFor(sleep);
-      }
-
-      // Unblock the other thread.
-      RetryEINTR(write)(fd.get(), &c, 1);
-    }
-
-    return reinterpret_cast<void*>(signal_test_num_samples.load());
-  };
-
-  ScopedThread th1(
-      static_cast<std::function<void*()>>(std::bind(work, socketfds[0])));
-  ScopedThread th2(
-      static_cast<std::function<void*()>>(std::bind(work, socketfds[1])));
-
-  absl::Time start = Now(main_clock);
-  // Start the timer.
-  struct itimerval timer = {};
-  timer.it_value = absl::ToTimeval(kPeriod);
-  timer.it_interval = absl::ToTimeval(kPeriod);
-  auto cleanup_itimer = ScopedItimer(id, timer).ValueOrDie();
-
-  // Unblock th1.
-  //
-  // N.B. th2 owns socketfds[1] but can't close it until it unblocks.
-  char c = 0;
-  TEST_CHECK(write(socketfds[1], &c, 1) == 1);
-
-  SignalTestResult result;
-
-  // Wait for the workers to be done and collect their sample counts.
-  result.worker_samples.push_back(reinterpret_cast<int64_t>(th1.Join()));
-  result.worker_samples.push_back(reinterpret_cast<int64_t>(th2.Join()));
-  cleanup_itimer.Release()();
-  result.expected_total = (Now(main_clock) - start) / kPeriod;
-  result.main_thread_samples = signal_test_num_samples.load();
-
-  return result;
-}
-
-int TestSIGALRMToMainThread() {
-  SignalTestResult result =
-      ItimerSignalTest(ITIMER_REAL, CLOCK_REALTIME, CLOCK_REALTIME, SIGALRM,
-                       absl::ZeroDuration());
-
-  std::cerr << "result: " << result << std::endl;
-
-  // ITIMER_REAL-generated SIGALRMs prefer to deliver to the thread group leader
-  // (but don't guarantee it), so we expect to see most samples on the main
-  // thread.
-  //
-  // The number of SIGALRMs delivered to a worker should not exceed 20%
-  // of the number of total signals expected (this is somewhat arbitrary).
-  const int worker_threshold = result.expected_total / 5;
-
-  //
-  // Linux only guarantees timers will never expire before the requested time.
-  // Thus, we only check the upper bound and also it at least have one sample.
-  TEST_CHECK(result.main_thread_samples <= result.expected_total);
-  TEST_CHECK(result.main_thread_samples > 0);
-  for (int num : result.worker_samples) {
-    TEST_CHECK_MSG(num <= worker_threshold, "worker received too many samples");
-  }
-
-  return 0;
-}
-
-// Random save/restore is disabled as it introduces additional latency and
-// unpredictable distribution patterns.
-TEST(ItimerTest, DeliversSIGALRMToMainThread_NoRandomSave) {
-  pid_t child;
-  int execve_errno;
-  auto kill = ASSERT_NO_ERRNO_AND_VALUE(
-      ForkAndExec("/proc/self/exe", {"/proc/self/exe", kSIGALRMToMainThread},
-                  {}, &child, &execve_errno));
-  EXPECT_EQ(0, execve_errno);
-
-  int status;
-  EXPECT_THAT(RetryEINTR(waitpid)(child, &status, 0),
-              SyscallSucceedsWithValue(child));
-
-  // Not required anymore.
-  kill.Release();
-
-  EXPECT_TRUE(WIFEXITED(status) && WEXITSTATUS(status) == 0) << status;
-}
-
-// Signals are delivered to threads fairly.
-//
-// sleep indicates how long to sleep worker threads each iteration to make the
-// entire process idle.
-int TestSIGPROFFairness(absl::Duration sleep) {
-  SignalTestResult result =
-      ItimerSignalTest(ITIMER_PROF, CLOCK_PROCESS_CPUTIME_ID,
-                       CLOCK_THREAD_CPUTIME_ID, SIGPROF, sleep);
-
-  std::cerr << "result: " << result << std::endl;
-
-  // The number of samples on the main thread should be very low as it did
-  // nothing.
-  TEST_CHECK(result.main_thread_samples < 80);
-
-  // Both workers should get roughly equal number of samples.
-  TEST_CHECK(result.worker_samples.size() == 2);
-
-  TEST_CHECK(result.expected_total > 0);
-
-  // In an ideal world each thread would get exactly 50% of the signals,
-  // but since that's unlikely to happen we allow for them to get no less than
-  // kNumSamplesDeviationRatio of the total observed samples.
-  TEST_CHECK_MSG(std::abs(result.worker_samples[0] - result.worker_samples[1]) <
-                     ((result.worker_samples[0] + result.worker_samples[1]) *
-                      kNumSamplesDeviationRatio),
-                 "one worker received disproportionate share of samples");
-
-  return 0;
-}
-
-// Random save/restore is disabled as it introduces additional latency and
-// unpredictable distribution patterns.
-TEST(ItimerTest, DeliversSIGPROFToThreadsRoughlyFairlyActive_NoRandomSave) {
-  // On the KVM and ptrace platforms, switches between sentry and application
-  // context are sometimes extremely slow, causing the itimer to send SIGPROF to
-  // a thread that either already has one pending or has had SIGPROF delivered,
-  // but hasn't handled it yet (and thus therefore still has SIGPROF masked). In
-  // either case, since itimer signals are group-directed, signal sending falls
-  // back to notifying the thread group leader. ItimerSignalTest() fails if "too
-  // many" signals are delivered to the thread group leader, so these tests are
-  // flaky on these platforms.
-  //
-  // TODO(b/143247272): Clarify why context switches are so slow on KVM.
-  const auto gvisor_platform = GvisorPlatform();
-  SKIP_IF(gvisor_platform == Platform::kKVM ||
-          gvisor_platform == Platform::kPtrace);
-
-  pid_t child;
-  int execve_errno;
-  auto kill = ASSERT_NO_ERRNO_AND_VALUE(
-      ForkAndExec("/proc/self/exe", {"/proc/self/exe", kSIGPROFFairnessActive},
-                  {}, &child, &execve_errno));
-  EXPECT_EQ(0, execve_errno);
-
-  int status;
-  EXPECT_THAT(RetryEINTR(waitpid)(child, &status, 0),
-              SyscallSucceedsWithValue(child));
-
-  // Not required anymore.
-  kill.Release();
-
-  EXPECT_TRUE(WIFEXITED(status) && WEXITSTATUS(status) == 0)
-      << "Exited with code: " << status;
-}
-
-// Random save/restore is disabled as it introduces additional latency and
-// unpredictable distribution patterns.
-TEST(ItimerTest, DeliversSIGPROFToThreadsRoughlyFairlyIdle_NoRandomSave) {
-  // See comment in DeliversSIGPROFToThreadsRoughlyFairlyActive.
-  const auto gvisor_platform = GvisorPlatform();
-  SKIP_IF(gvisor_platform == Platform::kKVM ||
-          gvisor_platform == Platform::kPtrace);
-
-  pid_t child;
-  int execve_errno;
-  auto kill = ASSERT_NO_ERRNO_AND_VALUE(
-      ForkAndExec("/proc/self/exe", {"/proc/self/exe", kSIGPROFFairnessIdle},
-                  {}, &child, &execve_errno));
-  EXPECT_EQ(0, execve_errno);
-
-  int status;
-  EXPECT_THAT(RetryEINTR(waitpid)(child, &status, 0),
-              SyscallSucceedsWithValue(child));
-
-  // Not required anymore.
-  kill.Release();
-
-  EXPECT_TRUE(WIFEXITED(status) && WEXITSTATUS(status) == 0)
-      << "Exited with code: " << status;
-}
-
-}  // namespace
-}  // namespace testing
-}  // namespace gvisor
-
-namespace {
-void MaskSIGPIPE() {
-  // Always mask SIGPIPE as it's common and tests aren't expected to handle it.
-  // We don't take the TestInit() path so we must do this manually.
-  struct sigaction sa = {};
-  sa.sa_handler = SIG_IGN;
-  TEST_CHECK(sigaction(SIGPIPE, &sa, nullptr) == 0);
-}
-}  // namespace
-
-int main(int argc, char** argv) {
-  // These tests require no background threads, so check for them before
-  // TestInit.
-  for (int i = 0; i < argc; i++) {
-    absl::string_view arg(argv[i]);
-
-    if (arg == gvisor::testing::kSIGALRMToMainThread) {
-      MaskSIGPIPE();
-      return gvisor::testing::TestSIGALRMToMainThread();
-    }
-    if (arg == gvisor::testing::kSIGPROFFairnessActive) {
-      MaskSIGPIPE();
-      return gvisor::testing::TestSIGPROFFairness(absl::ZeroDuration());
-    }
-    if (arg == gvisor::testing::kSIGPROFFairnessIdle) {
-      MaskSIGPIPE();
-      // Sleep time > ClockTick (10ms) exercises sleeping gVisor's
-      // kernel.cpuClockTicker.
-      return gvisor::testing::TestSIGPROFFairness(absl::Milliseconds(25));
-    }
-  }
-
-  gvisor::testing::TestInit(&argc, &argv);
-  return gvisor::testing::RunAllTests();
-}