1 files changed, 61 insertions, 0 deletions
diff --git a/base/process/port_provider_mac.h b/base/process/port_provider_mac.h
new file mode 100644
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+++ b/base/process/port_provider_mac.h
@@ -0,0 +1,61 @@
+// Copyright 2015 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_PROCESS_PORT_PROVIDER_MAC_H_
+#define BASE_PROCESS_PORT_PROVIDER_MAC_H_
+
+#include <mach/mach.h>
+
+#include "base/base_export.h"
+#include "base/macros.h"
+#include "base/observer_list.h"
+#include "base/process/process_handle.h"
+#include "base/synchronization/lock.h"
+
+namespace base {
+
+// Abstract base class that provides a mapping from ProcessHandle (pid_t) to the
+// Mach task port. This replicates task_for_pid(), which requires root
+// privileges.
+class BASE_EXPORT PortProvider {
+ public:
+  PortProvider();
+  virtual ~PortProvider();
+
+  class Observer {
+   public:
+    virtual ~Observer() {};
+    // Called by the PortProvider to notify observers that the task port was
+    // received for a given process.
+    // No guarantees are made about the thread on which this notification will
+    // be sent.
+    // Observers must not call AddObserver() or RemoveObserver() in this
+    // callback, as doing so will deadlock.
+    virtual void OnReceivedTaskPort(ProcessHandle process) = 0;
+  };
+
+  // Returns the mach task port for |process| if possible, or else
+  // |MACH_PORT_NULL|.
+  virtual mach_port_t TaskForPid(ProcessHandle process) const = 0;
+
+  // Observer interface.
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+ protected:
+  // Called by subclasses to send a notification to observers.
+  void NotifyObservers(ProcessHandle process);
+
+ private:
+  // ObserverList is not thread-safe, so |lock_| ensures consistency of
+  // |observer_list_|.
+  base::Lock lock_;
+  base::ObserverList<Observer> observer_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(PortProvider);
+};
+
+}  // namespace base
+
+#endif  // BASE_PROCESS_PORT_PROVIDER_MAC_H_