crashpad client for windows

client/crashpad_client_win.cc

+// Copyright 2014 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 "client/crashpad_client.h"
+
+#include <windows.h>
+
+#include "base/logging.h"
+
+namespace {
+// Time to wait for the handler to create a dump. This is tricky to figure out.
+const DWORD kMillisecondsUntilTerminate = 5000;
+
+// This is the exit code that the process will return to the system once the
+// crash has been handled by Crashpad. We don't want to clash with the 
+// application-defined exit codes but we don't know them so we use one that is
+// unlikely to be used.
+const UINT kCrashExitCode = 0xffff7001;
+
+// These two handles to events are leaked.
+HANDLE g_signal_exception = nullptr;
+HANDLE g_wait_termination = nullptr;
+
+LONG WINAPI UnhandledExceptionHandler(EXCEPTION_POINTERS* exception_pointers) {
+  // TODO (cpu): Here write |exception_pointers| to g_crashpad_info.
+  DWORD rv = SignalObjectAndWait(g_signal_exception,
+                                 g_wait_termination,
+                                 kMillisecondsUntilTerminate,
+                                 FALSE);
+  if (rv != WAIT_OBJECT_0) {
+    // Something went wrong. It is likely that a dump has not been created.
+    if (rv == WAIT_TIMEOUT) {
+      LOG(INFO) << "SignalObjectAndWait timed out";

[Mark Mentovai, 2015/04/29 20:17:25]

These two should probably be more severe than INFO, maybe WARNING? INFO is
pretty rare in Crashpad.

+    } else {
+      LOG(INFO) << "SignalObjectAndWait returned " << rv

[Mark Mentovai, 2015/04/29 20:17:25]

You can use PLOG which will stream and explain GetLastError() for you. We use
that pretty extensively in Crashpad.

+                << " with GLE = " << GetLastError();
+    }
+  }
+  // We don't want to generate more exceptions, so we take the fast route.
+  TerminateProcess(GetCurrentProcess(), kCrashExitCode);
+  return 0L;
+}
+
+}  // namespace
+
+namespace crashpad {
+
+CrashpadClient::CrashpadClient() {
+}
+
+CrashpadClient::~CrashpadClient() {
+}
+
+bool CrashpadClient::StartHandler(
+    const base::FilePath& handler,
+    const base::FilePath& database,
+    const std::string& url,
+    const std::map<std::string, std::string>& annotations,
+    const std::vector<std::string>& arguments) {
+  // TODO(cpu): Provide a reference implementation.
+  return false;
+}
+
+bool SetHandler(const std::string& ipc_port) {
+  // TODO (cpu): Contact the handler and obtain g_signal_exception and
+  // g_wait_termination.
+  return false;
+}
+
+bool CrashpadClient::UseHandler() {
+  if (!g_signal_exception)
+    return false;
+  if (!g_wait_termination)
+    return false;
+  // In theory we could store the previous handler but it is not clear what
+  // use we have for it.
+  SetUnhandledExceptionFilter(&UnhandledExceptionHandler);
+  return true;
+}
+
+}  // namespace crashpad