1 files changed, 0 insertions, 151 deletions
diff --git a/test/syscalls/linux/sigstop.cc b/test/syscalls/linux/sigstop.cc
deleted file mode 100644
index b2fcedd62..000000000
--- a/test/syscalls/linux/sigstop.cc
+++ /dev/null
@@ -1,151 +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 <stdlib.h>
-#include <sys/select.h>
-
-#include "gtest/gtest.h"
-#include "absl/flags/flag.h"
-#include "absl/time/clock.h"
-#include "absl/time/time.h"
-#include "test/util/multiprocess_util.h"
-#include "test/util/posix_error.h"
-#include "test/util/test_util.h"
-#include "test/util/thread_util.h"
-
-ABSL_FLAG(bool, sigstop_test_child, false,
-          "If true, run the SigstopTest child workload.");
-
-namespace gvisor {
-namespace testing {
-
-namespace {
-
-constexpr absl::Duration kChildStartupDelay = absl::Seconds(5);
-constexpr absl::Duration kChildMainThreadDelay = absl::Seconds(10);
-constexpr absl::Duration kChildExtraThreadDelay = absl::Seconds(15);
-constexpr absl::Duration kPostSIGSTOPDelay = absl::Seconds(20);
-
-// Comparisons on absl::Duration aren't yet constexpr (2017-07-14), so we
-// can't just use static_assert.
-TEST(SigstopTest, TimesAreRelativelyConsistent) {
-  EXPECT_LT(kChildStartupDelay, kChildMainThreadDelay)
-      << "Child process will exit before the parent process attempts to stop "
-         "it";
-  EXPECT_LT(kChildMainThreadDelay, kChildExtraThreadDelay)
-      << "Secondary thread in child process will exit before main thread, "
-         "causing it to exit with the wrong code";
-  EXPECT_LT(kChildExtraThreadDelay, kPostSIGSTOPDelay)
-      << "Parent process stops waiting before child process may exit if "
-         "improperly stopped, rendering the test ineffective";
-}
-
-// Exit codes communicated from the child workload to the parent test process.
-constexpr int kChildMainThreadExitCode = 10;
-constexpr int kChildExtraThreadExitCode = 11;
-
-TEST(SigstopTest, Correctness) {
-  pid_t child_pid = -1;
-  int execve_errno = 0;
-  auto cleanup = ASSERT_NO_ERRNO_AND_VALUE(
-      ForkAndExec("/proc/self/exe", {"/proc/self/exe", "--sigstop_test_child"},
-                  {}, nullptr, &child_pid, &execve_errno));
-
-  ASSERT_GT(child_pid, 0);
-  ASSERT_EQ(execve_errno, 0);
-
-  // Wait for the child subprocess to start the second thread before stopping
-  // it.
-  absl::SleepFor(kChildStartupDelay);
-  ASSERT_THAT(kill(child_pid, SIGSTOP), SyscallSucceeds());
-  int status;
-  EXPECT_THAT(RetryEINTR(waitpid)(child_pid, &status, WUNTRACED),
-              SyscallSucceedsWithValue(child_pid));
-  EXPECT_TRUE(WIFSTOPPED(status));
-  EXPECT_EQ(SIGSTOP, WSTOPSIG(status));
-
-  // Sleep for longer than either of the sleeps in the child subprocess,
-  // expecting the child to stay alive because it's stopped.
-  absl::SleepFor(kPostSIGSTOPDelay);
-  ASSERT_THAT(RetryEINTR(waitpid)(child_pid, &status, WNOHANG),
-              SyscallSucceedsWithValue(0));
-
-  // Resume the child.
-  ASSERT_THAT(kill(child_pid, SIGCONT), SyscallSucceeds());
-
-  EXPECT_THAT(RetryEINTR(waitpid)(child_pid, &status, WCONTINUED),
-              SyscallSucceedsWithValue(child_pid));
-  EXPECT_TRUE(WIFCONTINUED(status));
-
-  // Expect it to die.
-  ASSERT_THAT(RetryEINTR(waitpid)(child_pid, &status, 0), SyscallSucceeds());
-  ASSERT_TRUE(WIFEXITED(status));
-  ASSERT_EQ(WEXITSTATUS(status), kChildMainThreadExitCode);
-}
-
-// Like base:SleepFor, but tries to avoid counting time spent stopped due to a
-// stop signal toward the sleep.
-//
-// This is required due to an inconsistency in how nanosleep(2) and stop signals
-// interact on Linux. When nanosleep is interrupted, it writes the remaining
-// time back to its second timespec argument, so that if nanosleep is
-// interrupted by a signal handler then userspace can immediately call nanosleep
-// again with that timespec. However, if nanosleep is automatically restarted
-// (because it's interrupted by a signal that is not delivered to a handler,
-// such as a stop signal), it's restarted based on the timer's former *absolute*
-// expiration time (via ERESTART_RESTARTBLOCK => SYS_restart_syscall =>
-// hrtimer_nanosleep_restart). This means that time spent stopped is effectively
-// counted as time spent sleeping, resulting in less time spent sleeping than
-// expected.
-//
-// Dividing the sleep into multiple smaller sleeps limits the impact of this
-// effect to the length of each sleep during which a stop occurs; for example,
-// if a sleeping process is only stopped once, SleepIgnoreStopped can
-// under-sleep by at most 100ms.
-void SleepIgnoreStopped(absl::Duration d) {
-  absl::Duration const max_sleep = absl::Milliseconds(100);
-  while (d > absl::ZeroDuration()) {
-    absl::Duration to_sleep = std::min(d, max_sleep);
-    absl::SleepFor(to_sleep);
-    d -= to_sleep;
-  }
-}
-
-void RunChild() {
-  // Start another thread that attempts to call exit_group with a different
-  // error code, in order to verify that SIGSTOP stops this thread as well.
-  ScopedThread t([] {
-    SleepIgnoreStopped(kChildExtraThreadDelay);
-    exit(kChildExtraThreadExitCode);
-  });
-  SleepIgnoreStopped(kChildMainThreadDelay);
-  exit(kChildMainThreadExitCode);
-}
-
-}  // namespace
-
-}  // namespace testing
-}  // namespace gvisor
-
-int main(int argc, char** argv) {
-  gvisor::testing::TestInit(&argc, &argv);
-
-  if (absl::GetFlag(FLAGS_sigstop_test_child)) {
-    gvisor::testing::RunChild();
-    return 1;
-  }
-
-  return gvisor::testing::RunAllTests();
-}