win: Implement exception snapshot

util/win/nt_internals.h

Index: util/win/nt_internals.h
diff --git a/util/win/nt_internals.h b/util/win/nt_internals.h
new file mode 100644
index 0000000000000000000000000000000000000000..4743c4348dedfe3dc70e5cba498f5aba52a468f2
--- /dev/null
+++ b/util/win/nt_internals.h
@@ -0,0 +1,48 @@
+// 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 <windows.h>
+#include <winternl.h>
+
+#include "util/win/process_structs.h"
+
+namespace crashpad {
+
+// Copied from ntstatus.h because um/winnt.h conflicts with general inclusion of
+// ntstatus.h.
+#define STATUS_BUFFER_TOO_SMALL ((NTSTATUS)0xC0000023L)
+#define STATUS_INFO_LENGTH_MISMATCH ((NTSTATUS)0xC0000004L)
+
+// winternal.h defines THREADINFOCLASS, but not all members.
+enum { ThreadBasicInformation = 0 };
+
+NTSTATUS NtQuerySystemInformation(
+    SYSTEM_INFORMATION_CLASS system_information_class,
+    PVOID system_information,
+    ULONG system_information_length,
+    PULONG return_length);
+
+NTSTATUS NtQueryInformationThread(HANDLE thread_handle,
+                                  THREADINFOCLASS thread_information_class,
+                                  PVOID thread_information,
+                                  ULONG thread_information_length,
+                                  PULONG return_length);
+
+template <class Traits>
+NTSTATUS NtOpenThread(PHANDLE thread_handle,
+                      ACCESS_MASK desired_access,
+                      POBJECT_ATTRIBUTES object_attributes,
+                      const process_types::CLIENT_ID<Traits>* client_id);
+
+}  // namespace crashpad