Add ExcServerCopyState()

util/mach/exc_server_variants.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 "util/mach/exc_server_variants.h"
 
+#include <string.h>
+
 #include <algorithm>
 #include <vector>
 
 #include "base/logging.h"
 #include "util/mach/composite_mach_message_server.h"
 #include "util/mach/exc.h"
 #include "util/mach/exception_behaviors.h"
 #include "util/mach/excServer.h"
 #include "util/mach/mach_exc.h"
 #include "util/mach/mach_excServer.h"
@@ skipping 767 matching lines @@
 
 kern_return_t ExcServerSuccessfulReturnValue(exception_behavior_t behavior,
                                              bool set_thread_state) {
   if (!set_thread_state && ExceptionBehaviorHasState(behavior)) {
     return MACH_RCV_PORT_DIED;
   }
 
   return KERN_SUCCESS;
 }
 
+void ExcServerCopyState(exception_behavior_t behavior,
+                        const natural_t* old_state,
+                        mach_msg_type_number_t old_state_count,
+                        thread_state_t new_state,
+                        mach_msg_type_number_t* new_state_count) {
+  if (ExceptionBehaviorHasState(behavior)) {
+    *new_state_count = std::min(old_state_count, *new_state_count);
+    memcpy(new_state, old_state, *new_state_count * sizeof(old_state[0]));
+  }
+}
+
 }  // namespace crashpad