Fix some potential Mach port leaks from mach_host_self using a new ScopedMachPort class.

BUG=119379
TEST=none


Review URL: https://chromiumcodereview.appspot.com/11188003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162225 0039d316-1c4b-4281-b951-d872f2087c98

base/base.gypi

@@ -216,6 +216,8 @@
           'mac/scoped_cftyperef.h',
           'mac/scoped_ioobject.h',
           'mac/scoped_launch_data.h',
+          'mac/scoped_mach_port.cc',
+          'mac/scoped_mach_port.h',
           'mac/scoped_nsautorelease_pool.h',
           'mac/scoped_nsautorelease_pool.mm',
           'mac/scoped_nsexception_enabler.h',
@@ -620,6 +622,7 @@
               ['include', '^mac/foundation_util\\.'],
               ['include', '^mac/mac_logging\\.'],
               ['include', '^mac/objc_property_releaser\\.'],
+              ['include', '^mac/scoped_mach_port\\.'],
               ['include', '^mac/scoped_nsautorelease_pool\\.'],
               ['include', '^message_pump_mac\\.'],
               ['include', '^threading/platform_thread_mac\\.'],

base/mac/scoped_mach_port.cc

@@ -0,0 +1,20 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/mac/scoped_mach_port.h"
+
+namespace base {
+namespace mac {
+
+ScopedMachPort::ScopedMachPort(mach_port_t port) : port_(port) {
+}
+
+ScopedMachPort::~ScopedMachPort() {
+  if (port_ != MACH_PORT_NULL) {
+    mach_port_deallocate(mach_task_self(), port_);
+  }
+}
+
+}  // namespace mac
+}  // namespace base

base/mac/scoped_mach_port.h

@@ -0,0 +1,42 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_MAC_SCOPED_MACH_PORT_H_
+#define BASE_MAC_SCOPED_MACH_PORT_H_
+
+#include <mach/mach.h>
+
+#include "base/basictypes.h"
+#include "base/base_export.h"
+
+namespace base {
+namespace mac {
+
+// A class for managing the life of a Mach port, releasing via
+// mach_port_deallocate either its send and/or receive rights.
+class BASE_EXPORT ScopedMachPort {
+ public:
+  // Creates a scoper by taking ownership of the port.
+  explicit ScopedMachPort(mach_port_t port);
+
+  ~ScopedMachPort();
+
+  operator mach_port_t() const {
+    return port_;
+  }
+
+  mach_port_t get() const {
+    return port_;
+  }
+
+ private:
+  mach_port_t port_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedMachPort);
+};
+
+}  // namespace mac
+}  // namespace base
+
+#endif  // BASE_MAC_SCOPED_MACH_PORT_H_

base/process_util_mac.mm

@@ -34,6 +34,7 @@
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/mac/mac_util.h"
+#include "base/mac/scoped_mach_port.h"
 #include "base/string_util.h"
 #include "base/sys_info.h"
 #include "base/threading/thread_local.h"
@@ -468,7 +469,7 @@ mach_port_t ProcessMetrics::TaskForPid(ProcessHandle process) const {
 
 // Bytes committed by the system.
 size_t GetSystemCommitCharge() {
-  host_name_port_t host = mach_host_self();
+  base::mac::ScopedMachPort host(mach_host_self());
   mach_msg_type_number_t count = HOST_VM_INFO_COUNT;
   vm_statistics_data_t data;
   kern_return_t kr = host_statistics(host, HOST_VM_INFO,

base/sys_info_ios.mm

@@ -10,6 +10,7 @@
 #include <sys/types.h>
 
 #include "base/logging.h"
+#include "base/mac/scoped_mach_port.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/sys_string_conversions.h"
 
@@ -55,7 +56,8 @@ void SysInfo::OperatingSystemVersionNumbers(int32* major_version,
 int64 SysInfo::AmountOfPhysicalMemory() {
   struct host_basic_info hostinfo;
   mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
-  int result = host_info(mach_host_self(),
+  base::mac::ScopedMachPort host(mach_host_self());
+  int result = host_info(host,
                          HOST_BASIC_INFO,
                          reinterpret_cast<host_info_t>(&hostinfo),
                          &count);

base/sys_info_mac.cc

@@ -12,6 +12,7 @@
 #include <sys/types.h>
 
 #include "base/logging.h"
+#include "base/mac/scoped_mach_port.h"
 #include "base/stringprintf.h"
 
 namespace base {
@@ -44,7 +45,8 @@ void SysInfo::OperatingSystemVersionNumbers(int32* major_version,
 int64 SysInfo::AmountOfPhysicalMemory() {
   struct host_basic_info hostinfo;
   mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
-  int result = host_info(mach_host_self(),
+  base::mac::ScopedMachPort host(mach_host_self());
+  int result = host_info(host,
                          HOST_BASIC_INFO,
                          reinterpret_cast<host_info_t>(&hostinfo),
                          &count);