base/process/kill_win.cc

   1 // Copyright (c) 2013 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 "base/process/kill.h"
   6
   7 #include <io.h>
   8 #include <windows.h>
   9
  10 #include "base/bind.h"
  11 #include "base/bind_helpers.h"
  12 #include "base/logging.h"
  13 #include "base/message_loop/message_loop.h"
  14 #include "base/process/process_iterator.h"
  15 #include "base/win/object_watcher.h"
  16
  17 namespace base {
  18
  19 namespace {
  20
  21 // Exit codes with special meanings on Windows.
  22 const DWORD kNormalTerminationExitCode = 0;
  23 const DWORD kDebuggerInactiveExitCode = 0xC0000354;
  24 const DWORD kKeyboardInterruptExitCode = 0xC000013A;
  25 const DWORD kDebuggerTerminatedExitCode = 0x40010004;
  26
  27 // This exit code is used by the Windows task manager when it kills a
  28 // process.  It's value is obviously not that unique, and it's
  29 // surprising to me that the task manager uses this value, but it
  30 // seems to be common practice on Windows to test for it as an
  31 // indication that the task manager has killed something if the
  32 // process goes away.
  33 const DWORD kProcessKilledExitCode = 1;
  34
  35 // Maximum amount of time (in milliseconds) to wait for the process to exit.
  36 static const int kWaitInterval = 2000;
  37
  38 class TimerExpiredTask : public win::ObjectWatcher::Delegate {
  39  public:
  40   explicit TimerExpiredTask(Process process);
  41   ~TimerExpiredTask();
  42
  43   void TimedOut();
  44
  45   // MessageLoop::Watcher -----------------------------------------------------
  46   virtual void OnObjectSignaled(HANDLE object);
  47
  48  private:
  49   void KillProcess();
  50
  51   // The process that we are watching.
  52   Process process_;
  53
  54   win::ObjectWatcher watcher_;
  55
  56   DISALLOW_COPY_AND_ASSIGN(TimerExpiredTask);
  57 };
  58
  59 TimerExpiredTask::TimerExpiredTask(Process process) : process_(process.Pass()) {
  60   watcher_.StartWatching(process_.Handle(), this);
  61 }
  62
  63 TimerExpiredTask::~TimerExpiredTask() {
  64   TimedOut();
  65 }
  66
  67 void TimerExpiredTask::TimedOut() {
  68   if (process_.IsValid())
  69     KillProcess();
  70 }
  71
  72 void TimerExpiredTask::OnObjectSignaled(HANDLE object) {
  73   process_.Close();
  74 }
  75
  76 void TimerExpiredTask::KillProcess() {
  77   // Stop watching the process handle since we're killing it.
  78   watcher_.StopWatching();
  79
  80   // OK, time to get frisky.  We don't actually care when the process
  81   // terminates.  We just care that it eventually terminates, and that's what
  82   // TerminateProcess should do for us. Don't check for the result code since
  83   // it fails quite often. This should be investigated eventually.
  84   base::KillProcess(process_.Handle(), kProcessKilledExitCode, false);
  85
  86   // Now, just cleanup as if the process exited normally.
  87   OnObjectSignaled(process_.Handle());
  88 }
  89
  90 }  // namespace
  91
  92 bool KillProcess(ProcessHandle process, int exit_code, bool wait) {
  93   bool result = (TerminateProcess(process, exit_code) != FALSE);
  94   if (result && wait) {
  95     // The process may not end immediately due to pending I/O
  96     if (WAIT_OBJECT_0 != WaitForSingleObject(process, 60 * 1000))
  97       DPLOG(ERROR) << "Error waiting for process exit";
  98   } else if (!result) {
  99     DPLOG(ERROR) << "Unable to terminate process";
 100   }
 101   return result;
 102 }
 103
 104 TerminationStatus GetTerminationStatus(ProcessHandle handle, int* exit_code) {
 105   DWORD tmp_exit_code = 0;
 106
 107   if (!::GetExitCodeProcess(handle, &tmp_exit_code)) {
 108     DPLOG(FATAL) << "GetExitCodeProcess() failed";
 109     if (exit_code) {
 110       // This really is a random number.  We haven't received any
 111       // information about the exit code, presumably because this
 112       // process doesn't have permission to get the exit code, or
 113       // because of some other cause for GetExitCodeProcess to fail
 114       // (MSDN docs don't give the possible failure error codes for
 115       // this function, so it could be anything).  But we don't want
 116       // to leave exit_code uninitialized, since that could cause
 117       // random interpretations of the exit code.  So we assume it
 118       // terminated "normally" in this case.
 119       *exit_code = kNormalTerminationExitCode;
 120     }
 121     // Assume the child has exited normally if we can't get the exit
 122     // code.
 123     return TERMINATION_STATUS_NORMAL_TERMINATION;
 124   }
 125   if (tmp_exit_code == STILL_ACTIVE) {
 126     DWORD wait_result = WaitForSingleObject(handle, 0);
 127     if (wait_result == WAIT_TIMEOUT) {
 128       if (exit_code)
 129         *exit_code = wait_result;
 130       return TERMINATION_STATUS_STILL_RUNNING;
 131     }
 132
 133     if (wait_result == WAIT_FAILED) {
 134       DPLOG(ERROR) << "WaitForSingleObject() failed";
 135     } else {
 136       DCHECK_EQ(WAIT_OBJECT_0, wait_result);
 137
 138       // Strange, the process used 0x103 (STILL_ACTIVE) as exit code.
 139       NOTREACHED();
 140     }
 141
 142     return TERMINATION_STATUS_ABNORMAL_TERMINATION;
 143   }
 144
 145   if (exit_code)
 146     *exit_code = tmp_exit_code;
 147
 148   switch (tmp_exit_code) {
 149     case kNormalTerminationExitCode:
 150       return TERMINATION_STATUS_NORMAL_TERMINATION;
 151     case kDebuggerInactiveExitCode:  // STATUS_DEBUGGER_INACTIVE.
 152     case kKeyboardInterruptExitCode:  // Control-C/end session.
 153     case kDebuggerTerminatedExitCode:  // Debugger terminated process.
 154     case kProcessKilledExitCode:  // Task manager kill.
 155       return TERMINATION_STATUS_PROCESS_WAS_KILLED;
 156     default:
 157       // All other exit codes indicate crashes.
 158       return TERMINATION_STATUS_PROCESS_CRASHED;
 159   }
 160 }
 161
 162 bool WaitForProcessesToExit(const FilePath::StringType& executable_name,
 163                             TimeDelta wait,
 164                             const ProcessFilter* filter) {
 165   bool result = true;
 166   DWORD start_time = GetTickCount();
 167
 168   NamedProcessIterator iter(executable_name, filter);
 169   for (const ProcessEntry* entry = iter.NextProcessEntry(); entry;
 170        entry = iter.NextProcessEntry()) {
 171     DWORD remaining_wait = static_cast<DWORD>(std::max(
 172         static_cast<int64>(0),
 173         wait.InMilliseconds() - (GetTickCount() - start_time)));
 174     HANDLE process = OpenProcess(SYNCHRONIZE,
 175                                  FALSE,
 176                                  entry->th32ProcessID);
 177     DWORD wait_result = WaitForSingleObject(process, remaining_wait);
 178     CloseHandle(process);
 179     result &= (wait_result == WAIT_OBJECT_0);
 180   }
 181
 182   return result;
 183 }
 184
 185 bool CleanupProcesses(const FilePath::StringType& executable_name,
 186                       TimeDelta wait,
 187                       int exit_code,
 188                       const ProcessFilter* filter) {
 189   if (WaitForProcessesToExit(executable_name, wait, filter))
 190     return true;
 191   KillProcesses(executable_name, exit_code, filter);
 192   return false;
 193 }
 194
 195 void EnsureProcessTerminated(Process process) {
 196   DCHECK(!process.is_current());
 197
 198   // If already signaled, then we are done!
 199   if (WaitForSingleObject(process.Handle(), 0) == WAIT_OBJECT_0) {
 200     return;
 201   }
 202
 203   MessageLoop::current()->PostDelayedTask(
 204       FROM_HERE,
 205       Bind(&TimerExpiredTask::TimedOut,
 206            Owned(new TimerExpiredTask(process.Pass()))),
 207       TimeDelta::FromMilliseconds(kWaitInterval));
 208 }
 209
 210 }  // namespace base