components/browser_watcher/exit_code_watcher_win_unittest.cc

   1 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/browser_watcher/exit_code_watcher_win.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/process/process.h"
   9 #include "base/strings/string16.h"
  10 #include "base/strings/string_util.h"
  11 #include "base/strings/stringprintf.h"
  12 #include "base/synchronization/waitable_event.h"
  13 #include "base/test/multiprocess_test.h"
  14 #include "base/test/test_reg_util_win.h"
  15 #include "base/threading/platform_thread.h"
  16 #include "base/time/time.h"
  17 #include "base/win/scoped_handle.h"
  18 #include "testing/gtest/include/gtest/gtest.h"
  19 #include "testing/multiprocess_func_list.h"
  20
  21 namespace browser_watcher {
  22
  23 namespace {
  24
  25 const base::char16 kRegistryPath[] = L"Software\\ExitCodeWatcherTest";
  26
  27 MULTIPROCESS_TEST_MAIN(Sleeper) {
  28   // Sleep forever - the test harness will kill this process to give it an
  29   // exit code.
  30   base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(INFINITE));
  31   return 1;
  32 }
  33
  34 class ScopedSleeperProcess {
  35  public:
  36    ScopedSleeperProcess() : is_killed_(false) {
  37   }
  38
  39   ~ScopedSleeperProcess() {
  40     if (process_.IsValid()) {
  41       process_.Terminate(-1, false);
  42       EXPECT_TRUE(process_.WaitForExit(nullptr));
  43     }
  44   }
  45
  46   void Launch() {
  47     ASSERT_FALSE(process_.IsValid());
  48
  49     base::CommandLine cmd_line(base::GetMultiProcessTestChildBaseCommandLine());
  50     base::LaunchOptions options;
  51     options.start_hidden = true;
  52     process_ = base::SpawnMultiProcessTestChild("Sleeper", cmd_line, options);
  53     ASSERT_TRUE(process_.IsValid());
  54   }
  55
  56   void Kill(int exit_code, bool wait) {
  57     ASSERT_TRUE(process_.IsValid());
  58     ASSERT_FALSE(is_killed_);
  59     process_.Terminate(exit_code, false);
  60     int seen_exit_code = 0;
  61     EXPECT_TRUE(process_.WaitForExit(&seen_exit_code));
  62     EXPECT_EQ(exit_code, seen_exit_code);
  63     is_killed_ = true;
  64   }
  65
  66   const base::Process& process() const { return process_; }
  67
  68  private:
  69   base::Process process_;
  70   bool is_killed_;
  71 };
  72
  73 class ExitCodeWatcherTest : public testing::Test {
  74  public:
  75   typedef testing::Test Super;
  76
  77   static const int kExitCode = 0xCAFEBABE;
  78
  79   ExitCodeWatcherTest() : cmd_line_(base::CommandLine::NO_PROGRAM) {}
  80
  81   void SetUp() override {
  82     Super::SetUp();
  83
  84     override_manager_.OverrideRegistry(HKEY_CURRENT_USER);
  85   }
  86
  87   base::Process OpenSelfWithAccess(uint32 access) {
  88     return base::Process::OpenWithAccess(base::GetCurrentProcId(), access);
  89   }
  90
  91   void VerifyWroteExitCode(base::ProcessId proc_id, int exit_code) {
  92     base::win::RegistryValueIterator it(
  93           HKEY_CURRENT_USER, kRegistryPath);
  94
  95     ASSERT_EQ(1, it.ValueCount());
  96     base::win::RegKey key(HKEY_CURRENT_USER,
  97                           kRegistryPath,
  98                           KEY_QUERY_VALUE);
  99
 100     // The value name should encode the process id at the start.
 101     EXPECT_TRUE(base::StartsWith(it.Name(), base::StringPrintf(L"%d-", proc_id),
 102                                  false));
 103     DWORD value = 0;
 104     ASSERT_EQ(ERROR_SUCCESS, key.ReadValueDW(it.Name(), &value));
 105     ASSERT_EQ(exit_code, value);
 106   }
 107
 108  protected:
 109   base::CommandLine cmd_line_;
 110   registry_util::RegistryOverrideManager override_manager_;
 111 };
 112
 113 }  // namespace
 114
 115 TEST_F(ExitCodeWatcherTest, ExitCodeWatcherInvalidHandleFailsInit) {
 116   ExitCodeWatcher watcher(kRegistryPath);
 117
 118   // A waitable event has a non process-handle.
 119   base::Process event(::CreateEvent(NULL, false, false, NULL));
 120
 121   // A non-process handle should fail.
 122   EXPECT_FALSE(watcher.Initialize(event.Pass()));
 123 }
 124
 125 TEST_F(ExitCodeWatcherTest, ExitCodeWatcherNoAccessHandleFailsInit) {
 126   ExitCodeWatcher watcher(kRegistryPath);
 127
 128   // Open a SYNCHRONIZE-only handle to this process.
 129   base::Process self = OpenSelfWithAccess(SYNCHRONIZE);
 130   ASSERT_TRUE(self.IsValid());
 131
 132   // A process handle with insufficient access should fail.
 133   EXPECT_FALSE(watcher.Initialize(self.Pass()));
 134 }
 135
 136 TEST_F(ExitCodeWatcherTest, ExitCodeWatcherSucceedsInit) {
 137   ExitCodeWatcher watcher(kRegistryPath);
 138
 139   // Open a handle to this process with sufficient access for the watcher.
 140   base::Process self =
 141       OpenSelfWithAccess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION);
 142   ASSERT_TRUE(self.IsValid());
 143
 144   // A process handle with sufficient access should succeed init.
 145   EXPECT_TRUE(watcher.Initialize(self.Pass()));
 146 }
 147
 148 TEST_F(ExitCodeWatcherTest, ExitCodeWatcherOnExitedProcess) {
 149   ScopedSleeperProcess sleeper;
 150   ASSERT_NO_FATAL_FAILURE(sleeper.Launch());
 151
 152   ExitCodeWatcher watcher(kRegistryPath);
 153
 154   EXPECT_TRUE(watcher.Initialize(sleeper.process().Duplicate()));
 155
 156   // Verify that the watcher wrote a sentinel for the process.
 157   VerifyWroteExitCode(sleeper.process().Pid(), STILL_ACTIVE);
 158
 159   // Kill the sleeper, and make sure it's exited before we continue.
 160   ASSERT_NO_FATAL_FAILURE(sleeper.Kill(kExitCode, true));
 161
 162   watcher.WaitForExit();
 163   EXPECT_EQ(kExitCode, watcher.exit_code());
 164
 165   VerifyWroteExitCode(sleeper.process().Pid(), kExitCode);
 166 }
 167
 168 }  // namespace browser_watcher