win: Save contents of TEBs allowing !teb and !gle to work in windbg

handler/win/crashy_test_program.cc

 // Copyright 2015 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"
+#include "client/crashpad_client.h"
 #include "tools/tool_support.h"
 
 namespace crashpad {
 namespace {
 
 void SomeCrashyFunction() {
   volatile int* foo = reinterpret_cast<volatile int*>(7);

[Mark Mentovai, 2015/09/29 22:14:04]

Move after CreateFile().

[scottmg, 2015/09/30 18:54:11]

Done.

+  // Cause a GetLastError setting too before we crash.
+  CreateFile(L"non-existent file",

[Mark Mentovai, 2015/09/29 22:14:04]

Since we don’t control the current directory or its contents…

Maybe don’t crash if this doesn’t return INVALID_HANDLE_VALUE, so that the
inevitable test failure will look like this program’s problem and not the
process/thread reader’s.

SetLastError() may be an easier option, though.

[scottmg, 2015/09/30 18:54:11]

SetLastError() seems much better. Done.

+             GENERIC_READ,
+             0,
+             nullptr,
+             OPEN_EXISTING,
+             0,
+             nullptr);
   *foo = 42;
 }
 
 int CrashyMain(int argc, char* argv[]) {
   if (argc != 2) {
     fprintf(stderr, "Usage: %s <server_pipe_name>\n", argv[0]);
     return 1;
   }
 
   CrashpadClient client;
@@ skipping 10 matching lines @@
 
   return 0;
 }
 
 }  // namespace
 }  // namespace crashpad
 
 int wmain(int argc, wchar_t* argv[]) {
   return crashpad::ToolSupport::Wmain(argc, argv, crashpad::CrashyMain);
 }