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third_party/crashpad/crashpad/util/win/scoped_process_suspend_test.cc

Index: third_party/crashpad/crashpad/util/win/scoped_process_suspend_test.cc
diff --git a/third_party/crashpad/crashpad/util/win/scoped_process_suspend_test.cc b/third_party/crashpad/crashpad/util/win/scoped_process_suspend_test.cc
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+++ b/third_party/crashpad/crashpad/util/win/scoped_process_suspend_test.cc
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+// Copyright 2015 The Crashpad Authors. All rights reserved.
+//
+// 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 "util/win/scoped_process_suspend.h"
+
+#include <tlhelp32.h>
+
+#include <algorithm>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "test/errors.h"
+#include "test/win/win_child_process.h"
+#include "util/win/xp_compat.h"
+
+namespace crashpad {
+namespace test {
+namespace {
+
+// There is no per-process suspend count on Windows, only a per-thread suspend
+// count. NtSuspendProcess just suspends all threads of a given process. So,
+// verify that all thread's suspend counts match the desired suspend count.
+bool SuspendCountMatches(HANDLE process, DWORD desired_suspend_count) {
+  DWORD process_id = GetProcessId(process);
+
+  ScopedKernelHANDLE snapshot(CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0));
+  if (!snapshot.is_valid()) {
+    ADD_FAILURE() << ErrorMessage("CreateToolhelp32Snapshot");
+    return false;
+  }
+
+  THREADENTRY32 te;
+  te.dwSize = sizeof(te);
+
+  BOOL ret = Thread32First(snapshot.get(), &te);
+  if (!ret) {
+    ADD_FAILURE() << ErrorMessage("Thread32First");
+    return false;
+  }
+  do {
+    if (te.dwSize >= offsetof(THREADENTRY32, th32OwnerProcessID) +
+                         sizeof(te.th32OwnerProcessID) &&
+        te.th32OwnerProcessID == process_id) {
+      ScopedKernelHANDLE thread(
+          OpenThread(kXPThreadAllAccess, false, te.th32ThreadID));
+      EXPECT_TRUE(thread.is_valid()) << ErrorMessage("OpenThread");
+      DWORD result = SuspendThread(thread.get());
+      EXPECT_NE(result, static_cast<DWORD>(-1))
+          << ErrorMessage("SuspendThread");
+      if (result != static_cast<DWORD>(-1)) {
+        EXPECT_NE(ResumeThread(thread.get()), static_cast<DWORD>(-1))
+            << ErrorMessage("ResumeThread");
+      }
+      if (result != desired_suspend_count)
+        return false;
+    }
+    te.dwSize = sizeof(te);
+  } while (Thread32Next(snapshot.get(), &te));
+
+  return true;
+}
+
+class ScopedProcessSuspendTest final : public WinChildProcess {
+ public:
+  ScopedProcessSuspendTest() : WinChildProcess() {}
+  ~ScopedProcessSuspendTest() {}
+
+ private:
+  int Run() override {
+    char c;
+    // Wait for notification from parent.
+    EXPECT_TRUE(LoggingReadFile(ReadPipeHandle(), &c, sizeof(c)));
+    EXPECT_EQ(' ', c);
+    return EXIT_SUCCESS;
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedProcessSuspendTest);
+};
+
+TEST(ScopedProcessSuspend, ScopedProcessSuspend) {
+  WinChildProcess::EntryPoint<ScopedProcessSuspendTest>();
+  scoped_ptr<WinChildProcess::Handles> handles = WinChildProcess::Launch();
+
+  EXPECT_TRUE(SuspendCountMatches(handles->process.get(), 0));
+
+  {
+    ScopedProcessSuspend suspend0(handles->process.get());
+    EXPECT_TRUE(SuspendCountMatches(handles->process.get(), 1));
+
+    {
+      ScopedProcessSuspend suspend1(handles->process.get());
+      EXPECT_TRUE(SuspendCountMatches(handles->process.get(), 2));
+    }
+
+    EXPECT_TRUE(SuspendCountMatches(handles->process.get(), 1));
+  }
+
+  EXPECT_TRUE(SuspendCountMatches(handles->process.get(), 0));
+
+  // Tell the child it's OK to terminate.
+  char c = ' ';
+  EXPECT_TRUE(WriteFile(handles->write.get(), &c, sizeof(c)));
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace crashpad