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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/common/process_watcher.h"
#include "base/message_loop.h"
#include "base/object_watcher.h"
#include "base/sys_info.h"
// Maximum amount of time (in milliseconds) to wait for the process to exit.
static const int kWaitInterval = 2000;
namespace {
class ChildReaper : public mozilla::Runnable,
public base::ObjectWatcher::Delegate,
public MessageLoop::DestructionObserver {
public:
explicit ChildReaper(base::ProcessHandle process, bool force)
: process_(process), force_(force) {
watcher_.StartWatching(process_, this);
}
virtual ~ChildReaper() {
if (process_) {
KillProcess();
DCHECK(!process_) << "Make sure to close the handle.";
}
}
// MessageLoop::DestructionObserver -----------------------------------------
virtual void WillDestroyCurrentMessageLoop()
{
MOZ_ASSERT(!force_);
if (process_) {
WaitForSingleObject(process_, INFINITE);
base::CloseProcessHandle(process_);
process_ = 0;
MessageLoop::current()->RemoveDestructionObserver(this);
delete this;
}
}
// Task ---------------------------------------------------------------------
NS_IMETHOD Run() override {
MOZ_ASSERT(force_);
if (process_) {
KillProcess();
}
return NS_OK;
}
// MessageLoop::Watcher -----------------------------------------------------
virtual void OnObjectSignaled(HANDLE object) {
// When we're called from KillProcess, the ObjectWatcher may still be
// watching. the process handle, so make sure it has stopped.
watcher_.StopWatching();
base::CloseProcessHandle(process_);
process_ = 0;
if (!force_) {
MessageLoop::current()->RemoveDestructionObserver(this);
delete this;
}
}
private:
void KillProcess() {
MOZ_ASSERT(force_);
// OK, time to get frisky. We don't actually care when the process
// terminates. We just care that it eventually terminates, and that's what
// TerminateProcess should do for us. Don't check for the result code since
// it fails quite often. This should be investigated eventually.
TerminateProcess(process_, base::PROCESS_END_PROCESS_WAS_HUNG);
// Now, just cleanup as if the process exited normally.
OnObjectSignaled(process_);
}
// The process that we are watching.
base::ProcessHandle process_;
base::ObjectWatcher watcher_;
bool force_;
DISALLOW_EVIL_CONSTRUCTORS(ChildReaper);
};
} // namespace
// static
void ProcessWatcher::EnsureProcessTerminated(base::ProcessHandle process, bool force) {
DCHECK(process != GetCurrentProcess());
// If already signaled, then we are done!
if (WaitForSingleObject(process, 0) == WAIT_OBJECT_0) {
base::CloseProcessHandle(process);
return;
}
MessageLoopForIO* loop = MessageLoopForIO::current();
if (force) {
RefPtr<mozilla::Runnable> task = new ChildReaper(process, force);
loop->PostDelayedTask(task.forget(), kWaitInterval);
} else {
loop->AddDestructionObserver(new ChildReaper(process, force));
}
}
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