1// Copyright 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 "components/nacl/common/nacl_debug_exception_handler_win.h"
6
7#include "base/bind.h"
8#include "base/threading/platform_thread.h"
9#include "base/win/scoped_handle.h"
10#include "native_client/src/trusted/service_runtime/win/debug_exception_handler.h"
11
12namespace {
13
14class DebugExceptionHandler : public base::PlatformThread::Delegate {
15 public:
16  DebugExceptionHandler(base::ProcessHandle nacl_process,
17                        const std::string& startup_info,
18                        base::MessageLoopProxy* message_loop,
19                        const base::Callback<void(bool)>& on_connected)
20      : nacl_process_(nacl_process),
21        startup_info_(startup_info),
22        message_loop_(message_loop),
23        on_connected_(on_connected) {
24  }
25
26  virtual void ThreadMain() OVERRIDE {
27    // In the Windows API, the set of processes being debugged is
28    // thread-local, so we have to attach to the process (using
29    // DebugActiveProcess()) on the same thread on which
30    // NaClDebugExceptionHandlerRun() receives debug events for the
31    // process.
32    bool attached = false;
33    int pid = GetProcessId(nacl_process_);
34    if (pid == 0) {
35      LOG(ERROR) << "Invalid process handle";
36    } else {
37      if (!DebugActiveProcess(pid)) {
38        LOG(ERROR) << "Failed to connect to the process";
39      } else {
40        attached = true;
41      }
42    }
43    message_loop_->PostTask(FROM_HERE, base::Bind(on_connected_, attached));
44
45    if (attached) {
46      NaClDebugExceptionHandlerRun(
47          nacl_process_,
48          reinterpret_cast<const void*>(startup_info_.data()),
49          startup_info_.size());
50    }
51    delete this;
52  }
53
54 private:
55  base::win::ScopedHandle nacl_process_;
56  std::string startup_info_;
57  base::MessageLoopProxy* message_loop_;
58  base::Callback<void(bool)> on_connected_;
59
60  DISALLOW_COPY_AND_ASSIGN(DebugExceptionHandler);
61};
62
63}  // namespace
64
65void NaClStartDebugExceptionHandlerThread(
66    base::ProcessHandle nacl_process,
67    const std::string& startup_info,
68    base::MessageLoopProxy* message_loop,
69    const base::Callback<void(bool)>& on_connected) {
70  // The new PlatformThread will take ownership of the
71  // DebugExceptionHandler object, which will delete itself on exit.
72  DebugExceptionHandler* handler = new DebugExceptionHandler(
73      nacl_process, startup_info, message_loop, on_connected);
74  if (!base::PlatformThread::CreateNonJoinable(0, handler)) {
75    on_connected.Run(false);
76    delete handler;
77  }
78}
79