Use the correct null constants for Mach threads, tasks, and hosts

util/mach/exception_ports.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/exception_ports.h"
 
 #include "base/logging.h"
 #include "base/mac/mach_logging.h"
 
 namespace crashpad {
 
 ExceptionPorts::ExceptionPorts(TargetType target_type, mach_port_t target_port)
     : target_port_(target_port), dealloc_target_port_(false) {
   switch (target_type) {
     case kTargetTypeHost:
       get_exception_ports_ = host_get_exception_ports;
       set_exception_ports_ = host_set_exception_ports;
       target_name_ = "host";
-      if (target_port_ == MACH_PORT_NULL) {
+      if (target_port_ == HOST_NULL) {
         target_port_ = mach_host_self();
         dealloc_target_port_ = true;
       }
       break;
 
     case kTargetTypeTask:
       get_exception_ports_ = task_get_exception_ports;
       set_exception_ports_ = task_set_exception_ports;
       target_name_ = "task";
-      if (target_port_ == MACH_PORT_NULL) {
+      if (target_port_ == TASK_NULL) {
         target_port_ = mach_task_self();
         // Don’t deallocate mach_task_self().
       }
       break;
 
     case kTargetTypeThread:
       get_exception_ports_ = thread_get_exception_ports;
       set_exception_ports_ = thread_set_exception_ports;
       target_name_ = "thread";
-      if (target_port_ == MACH_PORT_NULL) {
+      if (target_port_ == THREAD_NULL) {
         target_port_ = mach_thread_self();
         dealloc_target_port_ = true;
       }
       break;
 
     default:
       NOTREACHED();
       get_exception_ports_ = NULL;
       set_exception_ports_ = NULL;
       target_name_ = NULL;
@@ skipping 64 matching lines @@
   }
 
   return true;
 }
 
 const char* ExceptionPorts::TargetTypeName() const {
   return target_name_;
 }
 
 }  // namespace crashpad